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Tropical Storm Beta Intermediate Advisory Number 17A
NWS National Hurricane Center Miami FL AL222020
700 PM CDT Mon Sep 21 2020
...BETA INCHING CLOSER TO THE TEXAS COAST...
...HEAVY RAINS OCCURRING OVER THE CENTRAL TEXAS COASTAL AREA...
SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION
ABOUT 20 MI...30 KM SE OF PORT OCONNOR TEXAS
ABOUT 25 MI...35 KM SSW OF MATAGORDA TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 5 MPH...7 KM/H
MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Port Aransas, Texas to Sabine Pass, Texas including Copano Bay,
Aransas Bay, San Antonio Bay, Matagorda Bay, and Galveston Bay.
A Tropical Storm Warning is in effect for...
* Port Aransas Texas to Morgan City Louisiana
A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 36 hours in the indicated locations. For a depiction
of areas at risk, please see the National Weather Service Storm
Surge Watch/Warning Graphic, available at hurricanes.gov. This is a
life-threatening situation. Persons located within these areas
should take all necessary actions to protect life and property from
rising water and the potential for other dangerous conditions.
Promptly follow evacuation and other instructions from local
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
DISCUSSION AND OUTLOOK
At 700 PM CDT (0000 UTC), the center of Tropical Storm Beta was
located by an Air Force Reserve reconnaissance aircraft near
latitude 28.3 North, longitude 96.1 West. Beta is moving toward the
northwest near 5 mph (7 km/h), and this general motion is forecast
to continue tonight. A decrease in forward speed and a sharp turn
to the north and northeast are expected on Tuesday. On the forecast
track, the center of Beta will continue to move toward the central
coast of Texas and will likely move inland overnight. Beta is
forecast to remain near or just offshore the coast of southeastern
Texas on Tuesday and Wednesday.
Maximum sustained winds are near 45 mph (75 km/h) with higher
gusts. Little change in strength is forecast before Beta reaches the
Texas coast. Weakening is anticipated once Beta moves inland.
Tropical-storm-force winds extend outward up to 175 miles (280 km)
from the center.
The latest minimum central pressure estimated from Air Force
Reserve reconnaissance data is 999 mb (29.50 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.
STORM SURGE: The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline. The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...
Port Aransas, TX to Sabine Pass, TX including Copano Bay, Aransas
Bay, San Antonio Bay, Matagorda Bay, and Galveston Bay...2-4 ft
Sabine Pass, TX to Ocean Springs, MS including Sabine Lake, Lake
Calcasieu, Vermilion Bay, Lake Borgne, Lake Pontchartrain, and Lake
Baffin Bay, TX to Port Aransas, TX including Corpus Christi Bay and
Baffin Bay... 1-3 ft
Mouth of the Rio Grande to Baffin Bay, TX...1-2 ft
The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large and
dangerous waves. Surge-related flooding depends on the relative
timing of the surge and the tidal cycle, and can vary greatly over
short distances. For information specific to your area, please see
products issued by your local National Weather Service forecast
WIND: Tropical storm conditions are expected to continue within
portions of the tropical storm warning area through Tuesday.
RAINFALL: Through Friday, Beta is expected to produce rainfall
accumulations of 5 to 10 inches with isolated totals of 15 inches
from the middle Texas coast to southeast Louisiana. Rainfall totals
of 3 to 5 inches are expected northward into the ArkLaTex region and
east into the Lower Mississippi Valley through the end of the week.
Flash and urban flooding is likely, as well as isolated minor river
TORNADOES: A tornado or two could occur through Tuesday near the
middle to upper Texas coast or the southwestern Louisiana coast.
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. Please consult products from your local weather office.
Next complete advisory at 1000 PM CDT.