Storm Summary Number 4 for Southern Plains Heavy Rain
NWS Weather Prediction Center College Park MD
1000 AM CDT Fri May 21 2021

...Additional heavy rainfall is forecast to fall over the Gulf
coast and Mississippi Valley through this weekend, exasperating
ongoing flood issues in the region...

Flash Flood Watches are in effect across the eastern half of the
Southern Plains into the Mississippi Valley and Gulf Coast.

Flood Warnings are in effect east of the DFW Metro, and further
southeast along the Gulf coast.

For a detailed graphical depiction of the latest watches, warnings
and advisories, please see www.weather.gov

At 900 AM CDT...National Weather Service Doppler RADAR detected a
complex of showers and thunderstorms over eastern Louisiana,
lifting northward. A low-level circulation and associated
thunderstorm activity was analyzed over the Gulf of Mexico, with a
central pressure of 1010 mb (29.82 in Hg).

...Selected preliminary Storm Total Rainfall in inches from 800 AM
CDT Sat May 16 through 900 AM CDT Fri May 21...

...LOUISIANA...
SOUTH LAKE CHARLES                  21.67 L-5 @ COMMON STREET
LAKE CHARLES 4 S                    15.84                    
LAKE CHARLES 2 SSW                  15.07                    
BATON ROGUE 3.5 E                   14.68                    
SHENADOAH 1.5 S                     14.33                    
BATON ROGUE 4.0 SSE                 13.55                    
PRAIRIEVILLE 2.0 S                  13.24                    
BAYOU MANCHAC                       13.09                    
IOWA 0.9 ESE                        11.14                    
BATON ROGUE                         10.19                    
CARENCRO 3.9 ENE                     9.61                    
BREAUX RIDGE 0.7 NNW                 8.57                    
ST. MARTINSVILLE 0.2 S               8.52                    
SLIDELL 3.2 E                        7.30                    
GRAND COTEAU 2.7 WSW                 6.93                    
NEW ORLEANS 5 N                      3.67                    

...TEXAS...
HILLEBRANDT BAYOU                   18.69 3200 GLENNBROOK DR 2
TAYLORS BAYOU                       16.72 ST 5400 ST HGHWY 365
KEITH LAKE                          16.58 ST 7300 @ HGHWY 87 2
KINGSVILLE                          13.74                    
PORT LAVACA 6.8 W                   13.32                    
EDNA 3.8 NNW                        12.64                    
FANNETT 5 WNW                       12.53                    
NEDERLAND 1.8 W                     12.31                    
TAYLOR LANDING                      11.92                    
ROBSTOWN 3.6 N                      11.06                    
PORT ARTHUR 6 SSW                   10.72                    
VICTORIA 2.1 ESE                    10.64                    
BEAUMONT 0.3 ESE                    10.57                    
VIDOR 1.4 SW                        10.57                    
ROCKPORT 3.0 NNW                     9.84                    
EL CAMPO 2.7 NW                      7.92                    
BISHOP                               7.75                    
PORT ARANSAS 4.0 SSW                 7.48                    
CORPUS CHRISTI 6.4 WSW               7.22                    
LA GRANGE                            6.89                    
TEXAS CITY 3.5 W                     6.33                    
RICHMOND 1.2 ESE                     6.09                    
GALVESTON 3.6 WSW                    5.76                    
HOUSTON 7.7 W                        4.68                    
PASADENA 4.4 WNW                     4.26                    


Through this Saturday, a continous feed of moisture from the Gulf
of Mexico is forecast to fuel additional thunderstorm development
over the region. Moreover, the area of disturbed weather over the
Gulf of Mexico has a 40% chance of developing into a tropical
cyclone, per the National Hurricane Center. The disturbance is
forecast to reach the northwest Gulf coast by late tonight, where
widespread 2-4" and locally 6" of rainfall is possible through
Saturday. Given the complete saturation of soils with ongoing
river flooding along the Texas and Louisiana coastal areas, heavy
rain could lead to flash, urban, and additional riverine flooding
across this region. In the event the National Hurricane Center
begins advisories for the Gulf system, a separate Storm Summary
will be issued for the tropical cyclone.      

The next Storm Summary will be issued by the Weather Prediction
Center at 1000 AM CDT Sat May 22 2021. Please refer to your local
National Weather Service office for additional information on this
event.

Asherman