Tropical Storm ETA (Text)

Tropical Storm Eta Discussion Number  44
NWS National Hurricane Center Miami FL       AL292020
400 AM EST Wed Nov 11 2020

Eta has become better organized over the past few hours, with a 
better-defined eye feature on the Key West radar.  Satellite 
pictures also show a more symmetric presentation and a large 
cluster of deep convection near the center.  Radar data has shown 
increasing wind speeds in the mid-levels, which supports 
conservatively raising the initial wind speed to 60 kt.  The 
current position is southwest of the eye feature on radar, assuming 
some shear remains, but a NOAA Hurricane Hunter aircraft is 
scheduled to be in the storm in a few hours to acquire better data 
on both the initial position and intensity.
It appears that the center of Eta has re-formed to the north- 
northeast tonight, so an initial motion is hard to determine, 
but is estimated to be northward at about 10 kt.  Remarkably, model 
guidance has become well clustered just east of the previous 
forecast track as it seems apparent that Eta will now recurve 
around the ridge toward the Florida Big Bend region and out into 
the western Atlantic Ocean.  The biggest change is that the models 
are faster than before, and the official forecast follows that 
lead, along with a small eastward forecast adjustment, near or just 
east of the model consensus.

Further strengthening is possible today while the shear remains 
low-to-moderate.  However, all of the models do show increasing 
shear by tonight, and the NHC forecast continues to call for 
weakening of Eta as it approaches the west coast of Florida.  
However, it would take only a small forecast error to allow Eta to 
come ashore as a hurricane, and hence a Hurricane Watch has been 
issued this morning.  Rapid weakening is anticipated once Eta makes 
landfall, and strong shear should prevent any regeneration over the 
western Atlantic Ocean. The new forecast is a little higher than 
the previous advisory, mostly due to current trends, and is closer 
to the more bullish HMON and HWRF models.
Key Messages:
1. Life-threatening storm surge is possible early Thursday along 
portions of the Florida Gulf Coast from Bonita Beach to 
Steinhatchee River, including Tampa Bay and Charlotte Harbor. 
Residents in this area should follow any advice given by local 
2. Hurricane-force winds are possible along portions of the west 
coast of Florida from Anna Maria Island to Yankeetown by early 
Thursday. Tropical-storm-force winds are expected by late Wednesday 
along portions of the Florida Gulf Coast from Bonita Beach to 
Suwanee River, and are possible Thursday from Suwannee River to 
Aucilla River. Interests elsewhere along the Florida Gulf Coast 
should monitor the progress of Eta, as additional watches and 
warnings may be needed today.
3. Heavy rainfall from Eta will continue across western Cuba and 
South Florida and spread northward across portions of West and North 
Florida Wednesday through Friday. Additional flash and urban 
flooding will be possible in South Florida on Wednesday, especially 
across previously inundated areas, and across portions of West 
Florida through Friday.
INIT  11/0900Z 25.0N  84.1W   60 KT  70 MPH
 12H  11/1800Z 26.4N  83.9W   65 KT  75 MPH
 24H  12/0600Z 27.9N  83.4W   60 KT  70 MPH
 36H  12/1800Z 29.2N  82.6W   45 KT  50 MPH...INLAND
 48H  13/0600Z 30.2N  81.2W   30 KT  35 MPH
 60H  13/1800Z 30.9N  79.5W   30 KT  35 MPH
 72H  14/0600Z 31.0N  78.0W   25 KT  30 MPH...POST-TROP/REMNT LOW
 96H  15/0600Z...DISSIPATED
Forecaster Blake

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Page last modified: Thursday, 31-Dec-2020 12:10:49 UTC