• STORM FLOATER •
SUBTROPICAL STORM 24L (άλφα)
PUBLIC ADVISORY #1
FORCE THIRTEEN SINGAPORE, SINGAPORE
1700 UTC FRI SEP 18 2020

...SUBTROPCIAL STORM FORMS WEST OF PORTUGAL...

SUMMARY OF 1500 UTC...INFORMATION
-----------------------------------
LOCATION...NEAR 39.9 N 9.3 W...
MAXIMUM SUSTAINED WINDS...50MPH...85KM/H
MINIMUM CENTRAL PRESSURE...999MB

WATCHES AND WARNINGS
-----------------------------------
NO WARNINGS IN EFFECT.
DISCUSSION
-----------------------------------
The small low pressure area that has been rotating around a larger 
extratropical low in the far northeastern Atlantic has become better 
organized this morning.  Moderate-to-deep convection has persisted 
near the center since last night, scatterometer data shows a closed 
40-kt low, and radar images from Portugal show a definite organized 
convective pattern.  While the system is still in the cyclonic 
envelope of the large extratropical low and likely neutral- or 
cold-core, it has developed enough tropical characteristics to be 
considered a subtropical storm.  The initial intensity is set to 45 
kt in accordance with the scatterometer data, assuming some 
undersampling for this small system.

Little change in strength is forecast until landfall in Portugal 
during the next couple of hours.  Global models show the small low 
moving northeastward at about 15 kt for the next 24 hours before 
dissipating over northern Spain or the Bay of Biscay. The track and 
intensity forecasts are consistent with the consensus guidance.
• RAMMB Multi-Model Diagnostic Comparison •
LOCAL AND OFFICIAL SOURCES BELOW
National Hurricane Center (Atlantic)

NEXT FULL ADVISORY AT SEPTEMBER 18 2020, 2100 UTC.

$$
Forecaster Knack
• OFFICIAL FWC-N FORECAST •
• NATIONAL HURRICANE CENTER FORECAST •

©2020 Force Thirteen • Cyclone Tracker • Text Products