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Tropical Storm Nicholas Special Discussion Number 4
NWS National Hurricane Center Miami FL AL142021
1130 PM CDT Sun Sep 12 2021
The center of Nicholas has re-formed about 150 n mi to the
north-northwest of the previous feature we were tracking, as
confirmed by aircraft reconnaissance and Brownsville radar, and
this large change necessitates a special advisory. The initial wind
speed is set to 45 kt, a blend of the reduced 56-kt flight level
winds and 45-50 kt SFMR values recently found by the plane.
Because of the re-formation, the track forecast has been accelerated
to indicate a landfall about 12 hours sooner than the last advisory.
The intensity forecast is about 5 kt stronger in the short term,
but actually ends up near the same intensity at landfall as the
last advisory because of less time over water. The track forecast
is blended with the previous one after landfall, and the intensity
forecast is lower after landfall because it is farther inland.
No changes to the watches or warnings are required at this time.
1. Periods of heavy rainfall are expected to impact portions of the
Texas and Louisiana coasts through the middle of the week.
Significant rainfall amounts are possible, potentially resulting in
areas of considerable flash and urban flooding, especially in highly
urbanized metropolitan areas. Isolated minor to moderate river
flooding is also expected.
2. There is the danger of life-threatening storm surge inundation
along the coast of Texas from Port Aransas to San Luis Pass.
Residents in these areas should follow any advice given by
3. Nicholas is forecast to approach the middle Texas coast as a
strong tropical storm on Monday, and could be near hurricane
intensity if it moves to the right of the forecast track and
remains over water longer. Tropical storm conditions are
expected along portions of the middle Texas coast beginning Monday,
with hurricane conditions possible from Port Aransas to
Freeport late Monday and Monday night.
4. Tropical storm conditions are expected along portions of the
northeastern coast of Mexico and the coast of south Texas beginning
FORECAST POSITIONS AND MAX WINDS
INIT 13/0430Z 24.8N 96.3W 45 KT 50 MPH
12H 13/1200Z 26.0N 96.7W 50 KT 60 MPH
24H 14/0000Z 28.0N 96.6W 55 KT 65 MPH
36H 14/1200Z 29.4N 96.3W 45 KT 50 MPH...INLAND
48H 15/0000Z 30.2N 95.6W 35 KT 40 MPH...INLAND
60H 15/1200Z 30.8N 94.9W 30 KT 35 MPH...INLAND
72H 16/0000Z 31.3N 94.2W 25 KT 30 MPH...INLAND
96H 17/0000Z 31.7N 92.0W 20 KT 25 MPH...POST-TROP/REMNT LOW