National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall in the Southern Plains and Mississippi Valley; Thunderstorms in Eastern Colorado on Thursday

A multiple day heavy rainfall event will begin to set up from the Southern Plains into the Mississippi Valley Thursday, peaking in intensity over the holiday weekend. Widely scattered thunderstorms are expected to develop across eastern Colorado Thursday afternoon and evening. Large hail will be the primary hazard. Read More >

Hazardous Weather Conditions

Current conditions at

Port Lavaca - Calhoun County Airport (KPKV)

Lat: 28.65°NLon: 96.68°WElev: 27ft.

A Few Clouds

77°F

25°C

Humidity 98%
Wind Speed SE 7 mph
Barometer 29.95 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 20 May 11:55 pm CDT
Extended Forecast for

2 Miles NNE Port Lavaca TX

Flood Watch May 21, 01:00am until May 25, 07:00pm
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74. East wind around 8 mph. Chance of precipitation is 30%.

    Low: 74 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 11am. Mostly cloudy, with a high near 77. East wind 7 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.

    High: 77 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly after 10pm. Mostly cloudy, with a low around 74. South wind 6 to 10 mph.

    Low: 74 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 80. South wind 6 to 11 mph. Chance of precipitation is 60%.

    High: 80 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 75. South southeast wind 9 to 13 mph. Chance of precipitation is 60%.

    Low: 75 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 10am, then showers and thunderstorms likely after 10am. Mostly cloudy, with a high near 79. South southeast wind 8 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.

    High: 79 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 74. East southeast wind 7 to 13 mph. Chance of precipitation is 90%.

    Low: 74 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 78. South wind 6 to 9 mph becoming west in the morning. Chance of precipitation is 80%.

    High: 78 °F

    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. East southeast wind 5 to 9 mph.

    Low: 73 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74. East wind around 8 mph. Chance of precipitation is 30%.
Thursday
Showers and thunderstorms likely, mainly before 11am. Mostly cloudy, with a high near 77. East wind 7 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly after 10pm. Mostly cloudy, with a low around 74. South wind 6 to 10 mph.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 80. South wind 6 to 11 mph. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 75. South southeast wind 9 to 13 mph. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm before 10am, then showers and thunderstorms likely after 10am. Mostly cloudy, with a high near 79. South southeast wind 8 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Saturday Night
Showers and possibly a thunderstorm. Low around 74. East southeast wind 7 to 13 mph. Chance of precipitation is 90%.
Sunday
Showers and possibly a thunderstorm. High near 78. South wind 6 to 9 mph becoming west in the morning. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. East southeast wind 5 to 9 mph.
Memorial Day
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE Port Lavaca TX
 28.65°N 96.61°W
Last Update:
11:56 pm CDT May 20, 2026
Forecast Valid:
12am CDT May 21, 2026-6pm CDT May 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation