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A tropical wave that moved off the northwest coast of Africa on July 4 passed through the Atlantic Ocean and Caribbean Sea without significant development . The wave moved across Central America into the northeastern Pacific Ocean on July 15 . Thunderstorm activity increased in the system between July 16 and 18 before rainbands became present within the tropical disturbance on July 19 . Tropical Depression Nine @-@ E formed later that day while 565 mi ( 910 km ) southwest of Acapulco , Mexico .
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Tropical Depression Nine @-@ E strengthened into Tropical Storm Hernan on July 21 while 684 mi ( 1 @,@ 100 km ) south of Cabo San Lucas . The tropical storm continued to strengthen and as it moved to the northwest , and became a hurricane late on July 21 . Hernan continued to strengthen and as it passed 145 mi ( 230 km ) southwest of Clarion Island . On July 23 , Hernan reached its peak strength of 155 mph ( 250 km / h ) and minimum pressure of 928 mb ( 27 @.@ 4 inHg ) as the center of circulation was 207 mi ( 335 km ) south @-@ southwest of Clarion Island . On July 24 , concentric eyewalls ( one eyewall located inside another ) formed around the center of Hernan , which was the first time this pattern had been observed with an eastern Pacific hurricane .
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Hernan kept Category 4 hurricane intensity a few more days and hurricane strength for six days overall . The hurricane weakened into a tropical storm on July 28 as it moved over cooler waters . Hernan turned more to the west as its low level center became separated from its thunderstorm activity and was steering by a surface high @-@ pressure system to its north . Hernan moved over cooler waters , dissipating as a tropical cyclone early on July 31 .
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= = = Hurricane Iselle = = =
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A tropical wave moved off the coast of Africa on July 7 . The wave moved west , but it was not until it moved across the Caribbean Sea that the wave 's convection organized . The system entered into the northeastern Pacific Ocean with concentrated convection and a surface center of circulation while southeast of Acapulco . Moving west @-@ northwest , Tropical Depression Ten @-@ E formed on July 20 393 mi ( 632 km ) south of Puerto Ángel , Mexico . Early on the following day , the depression strengthened into Tropical Storm Iselle . The storm continued strengthening while in the proximity of Hurricane Hernan , becoming a hurricane on July 22 .
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The hurricane continued to move west @-@ northwest through its duration , and reached its peak strength of 120 mph ( 190 km / h ) on July 25 . Iselle crossed Socorro Island , which recorded a 70 mph ( 110 km / h ) sustained wind and heavy rain on July 25 . The hurricane weakened on following days after it moved over cooler waters , downgraded to a tropical storm on July 28 and subsequently into a tropical depression on July 30 . The depression dissipated later that day , after losing its low @-@ level circulation 588 mi ( 946 km ) southwest of San Diego .
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= = = Tropical Depression Eleven @-@ E = = =
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On July 24 a tropical disturbance behind Hurricane Hernan strengthened into a tropical depression . Due to the close proximity of Hernan to its west , the development of the depression was hindered due to vertical wind shear from the outflow of Hernan . This wind shear dissipated the depression on July 26 , and its remnants were absorbed by the nearby cyclone . No damages or casualties were caused by the depression as it was well out to sea .
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= = = Tropical Storm Aka = = =
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Tropical Storm Aka was the only tropical storm to form in the Central North Pacific during 1990 . An area of disturbed weather began to organize on August 6 . By August 7 , the system became well @-@ enough organized to become designated Tropical depression One @-@ C. The depression intensified into a tropical storm while moving west , to the south of the Hawaiian Islands . On August 10 , Tropical Storm Aka peaked with maximum sustained winds of 60 mph ( 97 km / h ) . The storm continued to move west and approached Johnston Island , though the island 's weather did not deteriorate . The tropical storm crossed the International Date Line on August 13 . Aka weakened back into a depression and dissipated two days later on August 15 .
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= = = Tropical Depression Diana = = =
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Hurricane Diana struck eastern Mexico and managed to hold together , remaining a tropical depression as it entered the eastern Pacific Ocean late on August 8 . Although Tropical Depression Diana entered the eastern Pacific , the National Hurricane Center did not re @-@ classify the system . No re @-@ intensification occurred after the system entered the eastern Pacific , and it had dissipated as a tropical cyclone by the following day . The remnant tropical disturbance recurved through the Gulf of California while developing significant convection before it moved into northwest Mexico , which brought rainfall amounts of over 10 in ( 250 mm ) to local areas within the state of Sonora . The remnant disturbance moved into the American Southwest on August 11 .
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= = = Tropical Depression Two @-@ C = = =
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Tropical Depression Two @-@ C was the second and last tropical cyclone to develop within the north @-@ central Pacific Ocean in 1990 . The depression developed from a tropical disturbance well southeast of Hawaii , which became much better organized on the night of August 10 . The tropical depression moved in a west northwest direction for the next 18 hours and then changed to a west @-@ southwest track on August 11 . As it turned more to the southwest , the depression weakened until it dissipated on August 13 about 600 mi ( 970 km ) south @-@ southeast of Hilo , Hawaii .
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= = = Tropical Depression Twelve @-@ E = = =
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A persistent area of thunderstorm activity southwest of Puerto Vallarta became better organized and strengthened into Tropical Depression Twelve @-@ E on August 16 . Moving northwest , the system developed slowly as it was embedded within the Intertropical Convergence Zone . Easterly shear kept the system from reaching tropical storm strength and caused its ultimate dissipation on August 19 . No damages or fatalities were caused by this depression .
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= = = Hurricane Julio = = =
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A tropical wave moved off the western coast of Africa on August 5 , moving across the Atlantic Ocean and Caribbean Sea without significant development . The system entered the northeastern Pacific Ocean , and became well @-@ enough organized to be upgraded to Tropical Depression Thirteen @-@ E on August 17 while centered 404 mi ( 650 km ) south of Acapulco , Mexico . The depression moved on a west @-@ northwestward track and strengthened , becoming Tropical Storm Julio on August 18 . Strengthening continued and Julio reached hurricane strength on August 19 . The cyclone peaked with maximum sustained winds of 115 mph ( 185 km / h ) on August 21 . The storm turned westward and began weakening . Julio regained tropical storm status on August 23 and tropical depression status on August 24 before dissipating as a tropical cyclone later that day . No damage was reported from Julio .
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= = = Hurricane Kenna = = =
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A tropical wave moved off the coast of Africa on August 9 , and spawned Tropical Storm Fran four days later , before it moved through the southern Windward Islands on August 14 . While Fran dissipated shortly after that , the tropical wave progressed into the northeastern Pacific Ocean . The wave spawned Tropical Depression Fourteen @-@ E 808 mi ( 1 @,@ 300 km ) east @-@ southeast of Hurricane Julio . The depression moved westward for the next several days . As Julio weakened , the depression began to increase in strength . It became Tropical Storm Kenna on August 22 and continued to strengthen into a hurricane on August 25 , peaking with winds of 85 mph ( 137 km / h ) the next day . On August 26 , a strong frontal trough weakened the high pressure system to the storm 's north , causing a turn to the north during the next few days . The hurricane weakened in response to cooler water and increasing vertical wind shear , which removed convection from its center . Kenna weakened back to tropical storm strength on August 28 , then into a tropical depression on August 29 . The system dissipated as a tropical cyclone on August 30 .
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= = = Hurricane Lowell = = =
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A tropical wave moved off the northwestern coast of Africa into the Atlantic Ocean on August 11 . After moving across the Atlantic and Caribbean Sea without development , the system moved through the Intertropical Convergence Zone of the northeastern Pacific Ocean . The cloudiness moved northward toward the Gulf of Tehuantepec on August 22 . The thunderstorm activity organized sufficiently for the system to be upgraded to Tropical Depression Fifteen @-@ E on August 23 while 298 mi ( 480 km ) southeast of Acapulco , Mexico . The depression moved west @-@ northwestward and strengthened into a tropical storm 217 mi ( 350 km ) south @-@ southwest of Puerto Vallarta on August 25 . The storm began to turn more westward due to a strengthening high pressure system to its north and was upgraded to a hurricane on August 27 while 286 mi ( 460 km ) southwest of Cabo San Lucas . As the high to the north continued to strengthen , the hurricane turned west @-@ southwest .
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Thunderstorm activity with the hurricane began to weaken and Lowell was downgraded back to tropical storm status on August 28 . The tropical storm then turned to a north @-@ northwestward with the storm passing over cooler waters . On August 31 , the storm was downgraded to a tropical depression , with only minimal amounts of deep convection remaining within its circulation . Lowell dissipated as a tropical cyclone on September 1 , though a low @-@ level circulation of clouds could be seen on satellite imagery for the next few days . No damage or casualties was reported as a result of Lowell .
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= = = Hurricane Marie = = =
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A tropical wave moved off the northwestern coast of Africa on August 16 . The wave moved west through the Atlantic Ocean and Caribbean Sea without significant development . The wave moved across Central America and into the northeastern Pacific Ocean , on August 29 . Isolated convection with the system increased while south of the Gulf of Tehuantepec as the system moved northwest parallel to the southwest coast of Mexico . Once convective activity increased , the system was upgraded to Tropical Depression Sixteen @-@ E on September 7 while centered 659 mi ( 1 @,@ 060 km ) southwest of Clarion Island .
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A weaker than normal high pressure system controlled the movement of the depression , and the system moved slowly to the west through its duration . The depression strengthened into Tropical Storm Marie on September 8 , and into a hurricane on September 9 , while 522 mi ( 840 km ) south @-@ southwest of Clarion Island . Marie reached its peak intensity of 140 mph ( 230 km / h ) on September 11 . The hurricane crossed into the central North Pacific on September 14 as a hurricane with maximum sustained winds of 110 mph ( 180 km / h ) . The hurricane weakened thereafter and on September 17 Marie regained tropical storm status . The system weakened into a tropical depression on September 19 and dissipated as a tropical cyclone on September 21 near the Hawaiian coast . No casualties or damages were caused by Marie .
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= = = Hurricane Norbert = = =
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A tropical wave moved off the coast of Africa and across the Atlantic Ocean and Caribbean Sea without significant development . The wave entered the northeastern Pacific Ocean and began to show signs of organized thunderstorm development . Tropical Depression Seventeen @-@ E formed on September 10 while centered 758 mi ( 1 @,@ 220 km ) south @-@ southwest of Cabo San Lucas , Mexico . The depression became better organized and strengthened into Tropical Storm Norbert later in the day .
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On September 12 , Norbert absorbed Tropical Depression Eighteen @-@ E which was in close proximity . Norbert strengthened as it moved north @-@ northwestward . The tropical storm was upgraded to a hurricane on September 14 , and formed an eye on September 15 . The storm reached its peak strength of 80 mph ( 130 km / h ) sustained winds that day . Turning north of due west , Norbert then weakened as it moved over cooler waters . It was downgraded to a tropical storm later on September 15 , and then to a tropical depression on September 18 . Norbert dissipated as a tropical cyclone on September 19 after losing all its deep convection .
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= = = Tropical Depression Eighteen @-@ E = = =
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On September 12 , satellite images indicated that the eighteenth tropical depression of the season formed southwest of Cabo San Lucas . Located in close proximity to Tropical Storm Norbert , the depression would soon enter a region of colder sea surface temperatures , and the National Hurricane Center noted that only very little intensification was possible . As predicted , Norbert hindered further intensification of Tropical Depression Eighteen @-@ E. The National Hurricane Center noted six hours later that the depression would likely be absorbed into Norbert . The National Hurricane Center later believed that Tropical Depression Eighteen @-@ E was " dominating " the interaction between the two systems , and was forecast to absorb Norbert . Unlike the latter prediction , Norbert absorbed Tropical Depression Eighteen @-@ E later that day .
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= = = Hurricane Odile = = =
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A tropical wave move off the coast of Africa on September 5 , and crossed the Atlantic waters , the Caribbean Sea and eventually into the Pacific Ocean as a weak system . An area of convection entered into the northeastern Pacific Ocean a few hundred miles south of Acapulco , Mexico . On September 2 , Tropical Depression Nineteen @-@ E formed from this convection , while 746 mi ( 1 @,@ 201 km ) south @-@ southeast from the southern tip of Baja California . The depression moved on a west @-@ northwestward track , rounding the southwest side of a strong high pressure system . The depression continued to strengthen and was upgraded to Tropical Storm Odile on September 24 and into a hurricane on September 25 . Its intensity peaked with maximum sustained winds of 145 mph ( 233 km / h ) on September 26 .
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The hurricane began to turn more northwestward in response to a high @-@ pressure system weakening to its north . Odile began to weaken as it moved over cooler waters on September 28 . The cyclone regained tropical storm status on September 29 while it slowly progressed northward . The system weakened into a tropical depression status on September 30 . Once it lost its deep convection , Odile was steered southwestward by the low @-@ level flow , before it dissipated as a tropical cyclone on October 2 . Its remaining low @-@ level circulation of clouds continued on a southwestward course thereafter .
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= = = Tropical Storm Rachel = = =
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In mid @-@ September , a weak tropical wave moved off the coast of Northwest Africa . It moved westward and entered the eastern Pacific Ocean early on September 23 . Cloudiness became concentrated with the system south of the Gulf of Tehuantepec . On September 27 , the organized thunderstorm area was upgraded to Tropical Depression Twenty One @-@ E while 230 mi ( 370 km ) south of Acapulco . The depression developed slowly , and became a tropical storm on September 30 . As Rachel briefly moved northward , before re @-@ curving and accelerating towards the Mexican coast . The storm passed over the southern portion of Baja California Sur on October 2 . Rachel made its final landfall midway between Los Mochis and Culiacán , and became the only system to make landfall from the eastern north Pacific Ocean in 1990 . Rachel decayed rapidly over land , and the final public advisory on Rachel was issued early on October 3 @.@ its remnants continued accelerating over Texas until they lost their identity .
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The highest rainfall total from the system in Mexico totaled 9 @.@ 85 in ( 250 mm ) at Santa Anita near the tip of Baja California . Across northern Mexico , thousands were homeless , and 18 people died . In Texas , Rachel 's remnants caused heavy rain . Flooding occurred in the Big Bend area .
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= = = Hurricane Polo = = =
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Polo originated from a tropical wave that moved off the African coast on September 2 which spawned Hurricane Isidore in the Atlantic basin . On September 14 , the system increased in convection as it was moving to the west and approaching Central America . The southern extent of the wave crossed into the Pacific Ocean on September 18 .
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The wave continued westward and related thunderstorm activity increased during the following week . The convective system organized into Tropical Depression Twenty @-@ E on September 28 nearly midway between Mexico and Hawaii . Initially , the depression drifted toward the northwest due to a large upper @-@ level trough located to its west . Polo strengthened rapidly into a hurricane early on September 30 , with its winds peaking at 75 mph ( 121 km / h ) . Since the storm was very small , vertical wind shear caused significant weakening thereafter . On October 1 , Polo regained tropical storm strength as it was crossing into the north Central Pacific basin . It dissipated as a tropical cyclone later that day . There were no casualties or damages caused by Polo .
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= = = Tropical Storm Simon = = =
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A weakly defined tropical wave moved off the northwest coast of Africa on September 20 , and crossed the northern portion of the tropical Atlantic and northern South America without significant organization . The wave moved into the northeastern Pacific waters , off the coast of Colombia on September 30 . As the wave passed over southern Central America , rainbands and cloudiness increased with the system between October 1 and October 3 , before the system merged with the ITCZ from October 4 to October 6 . Signs of convective organization reappeared on October 8 , and by October 9 , the system was upgraded to Tropical Depression Twenty Two @-@ E 578 mi ( 930 km ) south of Cabo San Lucas , Mexico .
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The depression continued to develop and was upgraded to Tropical Storm Simon on October 10 while 604 mi ( 972 km ) south @-@ southwest of Cabo San Lucas . Due to a high @-@ pressure system to the north @-@ northwest , Simon continued on a west @-@ northwestward path . The tropical storm continued to strengthen to its peak intensity of 70 mph ( 110 km / h ) by late on October 11 . Simon passed over cooler waters and weakened back into a tropical depression on October 13 . The depression moved on a westward course , and the low @-@ level circulation was displaced from its deep convection during the following day . Simon then dissipated as a tropical cyclone early on October 15 across the open waters of the northeast Pacific .
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= = = Hurricane Trudy = = =
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A tropical wave moved across the northeast Pacific Ocean and formed a tropical depression south of Mexico on October 16 . It strengthened at a moderate pace and reached hurricane intensity on October 18 . Trudy entered a favorable environment and explosively intensified , reaching its first peak in strength on October 20 . At that time , an upper @-@ level trough drifted Trudy north , which increased vertical shear , causing it to substantially weaken the system back to Category 1 hurricane status . The trough outran the storm and was replaced by a ridge which turned the storm back to the west and led to its re @-@ intensification to a Category 4 hurricane . Another upper level trough approached which pulled Trudy northward once again , and sheared the hurricane apart . The cyclone dissipated on November 1 . Eventually , some of its moisture spread over parts of Mexico and the United States .
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Except for Socorro Island , Trudy had no impact on land . The island reported hurricane force winds for seven hours . Trudy also had an unusually large eye , which was as large as 58 mi ( 93 km ) wide . Trudy is the fourth @-@ strongest Pacific hurricane in October , behind Kenna of the 2002 season , Rick of the 2009 season , and Patricia of the 2015 season . Trudy also spent 78 hours of its life as a Category 4 hurricane , longer than any other hurricane in the Eastern Pacific basin .
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= = = Hurricane Vance = = =
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An area of disturbed weather , possibly related to a tropical wave , organized into Tropical Depression Twenty Four @-@ E on October 21 . It strengthened into Tropical Storm Vance early on October 23 and then into a hurricane two days later . Vance moved parallel to the west coast of Mexico and approached the southern tip of the Baja California Peninsula . Before it could strike land , a high @-@ pressure area blocked Vance 's path and forced the storm to transcribe a small clockwise loop over a two @-@ day period . During the loop , Vance encountered wind shear and cool waters stirred up by Trudy as well as earlier in its duration . Vance weakened to a tropical storm on October 27 and a depression on October 30 . The cyclone dissipated late on October 31 .
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= = Accumulated Cyclone Energy ( ACE ) Rating = =
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The table on the right shows the ACE for each storm in the season . ACE is , broadly speaking , a measure of the power of the hurricane multiplied by the length of time it existed , so storms that last a long time , as well as particularly strong hurricanes , have high ACEs . ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots ( 39 mph , 63 km / h ) or tropical storm strength .
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The figures in parentheses are for storms in the Central Pacific basin west of 140 ° W ; those not in parenthesis are for the Eastern Pacific basin .
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The cumulative ACE for the Eastern Pacific this season fell within the official " Above Normal " grading , being one of the most active . This occurred because the season had many intense storms that lasted for a long period of time . Also it is important to note that this is the third highest ACE , only behind the 1992 and 2015 seasons respectively .
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= = 1990 storm names = =
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The following names were used for named storms that formed in the eastern Pacific in 1990 . No names were retired , so it was used again in the 1996 season . This is the same list used for the 1984 season . Storms were named Trudy and Vance for the first time in 1990 . Names that were not assigned are marked in gray .
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One name from the Central Pacific list was used – Aka . It was the first usage for that name .
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= Track and field =
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