039  
WTNT32 KNHC 222042  
TCPAT2  
 
BULLETIN  
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  
CENTER...  
 
 
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION  
----------------------------------------------  
LOCATION...29.0N 96.3W  
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  
OFFICES.  
 
 
NEXT ADVISORY  
-------------  
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  
 

 
FORECASTER STEWART  
 
 
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