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Tropical Depression Beta Advisory Number 21
NWS National Hurricane Center Miami FL AL222020
400 PM CDT Tue Sep 22 2020
...SLOW-MOVING BETA PRODUCING HEAVY RAINFALL AND FLOODING OVER
PORTIONS OF THE UPPER TEXAS COAST...
...THIS IS THE LAST ADVISORY ISSUED BY THE NATIONAL HURRICANE
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
ABOUT 40 MI...65 KM N OF PORT OCONNOR TEXAS
ABOUT 35 MI...55 KM NNW OF MATAGORDA TEXAS
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...ENE OR 65 DEGREES AT 5 MPH...7 KM/H
MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES
WATCHES AND WARNINGS
There are no coastal watches or warnings in effect.
DISCUSSION AND OUTLOOK
At 400 PM CDT (2100 UTC), the center of Tropical Depression Beta was
located by surface observations, satellites, and NOAA Doppler
weather radars near latitude 29.0 North, longitude 96.3 West. The
depression is moving toward the east-northeast near 5 mph (7 km/h)
and this general motion is expected to continue through Friday. On
the forecast track, the center of Beta will move inland over
southeastern Texas through Wednesday and then over Louisiana and
Mississippi Wednesday night through Friday.
Data from surface observations and NOAA Doppler weather radars
indicate that maximum sustained winds have decreased to near 30 mph
(45 km/h) with higher gusts. Gradual weakening is forecast through
Friday, and Beta is expected to become a remnant low pressure system
by late Wednesday.
The estimated minimum central pressure based on nearby surface
observations is 1008 mb (29.77 inches).
HAZARDS AFFECTING LAND
Key messages for Beta can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT2 and WMO header WTNT42 KNHC.
RAINFALL: For the middle and upper Texas coast, additional
rainfall of 4 to 8 inches with isolated storm totals up to 20
inches is expected. Significant flash and urban flooding is
occurring and will continue today. Minor to isolated moderate river
flooding is likely.
Rainfall totals of 13 to 14 inches have been measured across
portions of the Houston metropolitan area thus far.
Rainfall totals of 2 to 5 inches are expected east into the Lower
Mississippi Valley and portions of the Tennessee Valley through the
end of the week. Flash and urban flooding is possible, as well as
isolated minor river flooding on smaller rivers.
TORNADOES: A tornado or two cannot be ruled out this evening along
the upper Texas and southwestern Louisiana coasts.
SURF: Swells generated by a combination of Beta and a cold front
over the northern Gulf of Mexico will continue along the coasts of
Louisiana and Texas during the next couple of days. These swells
are likely to cause life-threatening surf and rip current
conditions. Information on ongoing coastal flooding can be found in
coastal flood products issued by local National Weather Service
This is the last NHC advisory on Beta. Future information on this
system, including the rainfall threat, can be found in Public
Advisories issued by the Weather Prediction Center beginning at
10 PM CDT, under AWIPS header TCPAT2, WMO header WTNT32 KWNH, and
on the web at http://www.wpc.ncep.noaa.gov