Hurricane and Tropical Cyclones


Tropical Weather Discussion

axpz20 knhc 260254

Tropical weather discussion                                     
NWS National Hurricane Center Miami FL                         
0405 UTC sun Oct 26 2014

Tropical weather discussion for the eastern Pacific Ocean from 
the Equator to 32n...east of 140w. The following information is 
based on satellite observations...radar...and 
meteorological analysis.

Based on 0000 UTC surface analysis and satellite imagery through 
0300 UTC.                       

...Special features...                                       
Gulf of Tehuantepec Gale Warning...strong high pressure across 
the western Gulf of Mexico has been working in conjunction with 
an area of low pres in the eastern Pacific near 10n94w to drive 
northerly winds through the chivela pass into the Gulf of 
Tehuantepec. Winds may be temporarily just below gale force 
currently...but overnight drainage effects will allow winds to 
increase to gale force through the early morning. The high pres 
over the western Gulf is expected to weaken and shift east 
through sun...allowing gap winds to diminish below into the Gulf 
of Tehuantepec by midday sun...and below 20 kt through midday 
Mon. Seas are at least 14 ft with seas to 9 ft in short period 
NE swell reaching downstream over 500 nm to the SW and 
increasingly mixing with longer period SW swell. Wave heights in 
the Gulf of Tehuantepec will subside to below 8 ft by Mon 
afternoon as winds diminish. 

...Intertropical convergence zone/monsoon trough...           
monsoon trough axis extends from 08n78w to across Panama and 
Costa Rica to 11n86w to low pres near 10n94w 1010 mb to 09n112w 
to low pres near 13n130w 1010 mb to 08n140w. Scattered moderate 
isolated strong convection is within 180 nm S of axis 83w and 
90w. Scattered moderate convection is within 120 NW quadrant and 
240 nm SW quadrant of low pres near 10n94w. Scattered moderate 
convection is within 60 nm SW quadrant of low pres near 09n112w. 
Scattered moderate convection is within 120 nm S of axis between 
120w and 128w. 

1020 mb high pres centered near 25n124w extends a ridge axis 
southeastward to 17n105w. Gentle to moderate tradewinds persist 
over waters between the ridge and N of the monsoon trough. A 
cold front lies to the W of the high from 30n125w to 23n140w. 
Earlier ascat satellite passes indicated moderate to fresh 
breezes near the front likely in NW swell. A Jason-2 pass from 
15 UTC revealed seas above 8 ft behind the front. The front will 
weaken through Sun morning before dissipating...and the 
aforementioned high pres system will merge with the larger 
subtropical high to the NW. The NW swell currently behind the 
front will outrun it later today and bring seas in the 8-14 ft 
range to much of the area N of 20n W of 115w through Mon 

Several areas of weak low pres are noted along the monsoon 
trough. Convection is most prevalent near the western low pres 
system near 13n130w...enhanced in part by upper troughing W of 
the area and the fact that the low is under the rear right 
quadrant of an upper jet on the eastern side of the upper 

Farther east...broad upper level divergence extends over the 
eastern waters between an anticyclone centered near in the 
Caribbean near 15n80w and easterly winds aloft along the Equator 
between the galapagos and Central America. There is ample 
moisture here...with precipitable water values around 50 
millimeters S of Panama. Conditions should remain favorable for 
convection to continue here through sun and diminish somewhat on 


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Dr. Jeff Masters' Blog
By Dr. Jeff Masters, 2:09 PM EDT on October 25, 2014
Director of Meteorology, Weather Underground
(By Steve Gregory - Substituting for Dr. Masters who is taking the weekend off.)


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