Tropical Storm Genevieve

000
WTPZ42 KNHC 251435
TCDEP2
 
Tropical Storm Genevieve Discussion Number   5
NWS National Hurricane Center Miami FL       EP072026
900 AM CST Sat Jul 25 2026
 
Since the prior advisory, Genevieve's structure has improved, with a 
formative central dense overcast with cloud tops below -75 C 
blossoming over the estimated center. While earlier microwave 
imagery showed the inner core was still organizing with the bulk of 
the convection on its eastern flank, first light visible images 
suggest this convection is now wrapping around the center. TAFB 
provided a subjective Dvorak intensity estimate of T3.5/55 kt for 
1200 UTC, while objective intensity estimates are a bit lower 
ranging from 40 to 55 kt. Favoring the higher side of these 
estimates yields an intensity of 50 kt for this advisory. 
 
Genevieve jogged a little right of the previous forecast track, but 
appears to have resumed a more west-northwestward motion at   
300/13 kt. The track forecast reasoning remains unchanged; a 
strong deep-layer ridge centered over the southwestern United 
States extending into the Pacific should keep Genevieve on a 
general west-northwestward to northwestward track through the 
forecast period, with some gradual slowing. The track guidance aids 
remain in excellent agreement, and other than the initial position 
adjustment, the latest NHC track is quite similar to the prior one, 
blending the Google DeepMind ensemble mean (GDMI) and HFIP corrected 
consensus approach (HCCA) track guidance. 

Other than some light to moderate northwesterly vertical wind shear, 
Genevieve's environment remains quite favorable for rapid 
intensification (RI) with very warm sea-surface temperatures   
(SSTs, 30 C) and sufficient deep-layer moisture. The small core of 
the tropical cyclone is another factor that will likely enable a 
rapid change in intensity. Not surprisingly, the RI indices are very 
high for Genevieve, over both the next 24 and 48 h. The latest NHC 
intensity forecast now shows RI beginning later today, and the 
timing of peak intensity has been moved up to 48 h. After that time, 
SSTs begin to gradually cool, and the ECMWF-SHIPS guidance also 
shows a subtle increase in shear around the day 3 time frame. 
Genevieve will also likely be undergoing inner-core oscillations by 
that time that could also cause fluctuations in intensity. At the 
end of the forecast, Genevieve will likely be crossing the 26 C SST 
isotherm leading to a faster rate of weakening. The NHC intensity 
forecast remains on the high end of the guidance envelope; only the 
HCCA aid is higher. However, most of the reliable intensity models 
indicate Genevieve becoming a major hurricane within the 36-60 h 
period. 
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  25/1500Z 10.8N 104.3W   50 KT  60 MPH
 12H  26/0000Z 11.8N 106.2W   65 KT  75 MPH
 24H  26/1200Z 12.9N 108.3W   80 KT  90 MPH
 36H  27/0000Z 14.2N 110.2W  100 KT 115 MPH
 48H  27/1200Z 15.5N 112.0W  115 KT 130 MPH
 60H  28/0000Z 16.6N 113.6W  110 KT 125 MPH
 72H  28/1200Z 17.6N 115.2W  105 KT 120 MPH
 96H  29/1200Z 19.0N 118.5W   90 KT 105 MPH
120H  30/1200Z 20.5N 122.5W   70 KT  80 MPH
 
$$
Forecaster Papin