簽到天數: 1524 天
WTNT44 KNHC 150235
Tropical Depression Nicholas Discussion Number 12
NWS National Hurricane Center Miami FL AL142021
1000 PM CDT Tue Sep 14 2021
Satellite imagery, radar data, and surface observation indicate
that the center of Nicholas is over the Beaumont/Port Arthur area
of southeastern Texas. The cyclone is currently comprised of a
large swirl of low- to mid-level clouds and showers, with a few
patches of deep convection well removed from the center. The
initial intensity of 30 kt is based on a combination of Doppler
radar data and surface obs, and these winds are mainly over water
to the southeast of the center. Nicholas should continue to weaken
due to strong shear, dry air entrainment, and land interaction,
and the cyclone is forecast to degenerate to a remnant low after 24
h and dissipate completely by 72 h. It should be noted that some
of the track guidance models show enough south of east motion to
bring the center back over the Gulf of Mexico in a day or two.
However, even if this should occur the shear and dry air should
prevent any re-development.
The initial motion is 060/5. While there is some spread in the
guidance, it generally agrees on a slow eastward motion for 36 h
or so, followed by a northward drift. The new forecast track has
only minor changes from the previous track.
Although the winds associated with Nicholas are subsiding, due
to the forecast slow motion, heavy rainfall and a significant flash
flood risk will continue along the Gulf Coast for the next couple
The is the last advisory on Nicholas issued by the National
Hurricane Center. Future information on this system can be found in
Public Advisories issued by the Weather Prediction Center beginning
at 4 AM CDT, under AWIPS header TCPAT4, WMO header WTNT34 KWNH, and
on the web at http://www.wpc.ncep.noaa.gov.
1. Heavy rainfall will impact areas across southern and central
Louisiana, southern Mississippi, far southern Alabama, and the
western Florida Panhandle through early Friday. Significant rainfall
amounts are expected, potentially resulting in areas of
life-threatening flash and urban flooding across these areas.
Widespread minor to isolated moderate river flooding is also
2. Storm surge inundation along the coasts of upper Texas and
southwestern Louisiana will diminish tonight.
3. Wind gusts to tropical-storm force are possible for a few more
hours along portion of the Louisiana and upper Texas coasts.
FORECAST POSITIONS AND MAX WINDS
INIT 15/0300Z 30.0N 94.1W 30 KT 35 MPH
12H 15/1200Z 30.2N 93.6W 25 KT 30 MPH...INLAND
24H 16/0000Z 30.2N 92.9W 25 KT 30 MPH...INLAND
36H 16/1200Z 30.4N 92.6W 20 KT 25 MPH...POST-TROP/REMNT LOW
48H 17/0000Z 30.9N 92.6W 15 KT 15 MPH...POST-TROP/REMNT LOW
60H 17/1200Z 31.5N 92.6W 15 KT 15 MPH...POST-TROP/REMNT LOW