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

Greeneville-Greene County Municipal Airport (KGCY)

Lat: 36.2°NLon: 82.81°WElev: 1608ft.

Overcast

68°F

20°C

Humidity 83%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 20 May 11:55 pm EDT
Extended Forecast for

Flag Pond TN

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after noon. High near 76. Calm wind. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 76 °F

    Chance
    T-storms then
    Showers

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 10pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 63. Calm wind becoming southeast around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 11am. High near 75. Southeast wind around 5 mph. Chance of precipitation is 80%.

    High: 75 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm, then showers after 11pm. Low around 64. Southeast wind around 5 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 64 °F

    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 11am. High near 77. South wind around 5 mph. Chance of precipitation is 100%.

    High: 77 °F

    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 63. South wind around 5 mph becoming calm.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 78. Chance of precipitation is 80%.

    High: 78 °F

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers after 2am. Low around 63. Chance of precipitation is 80%.

    Low: 63 °F

    Showers then
    Chance
    Showers

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 64. Calm wind.
Thursday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after noon. High near 76. Calm wind. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Showers and thunderstorms likely before 10pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 63. Calm wind becoming southeast around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Showers, with thunderstorms also possible after 11am. High near 75. Southeast wind around 5 mph. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm, then showers after 11pm. Low around 64. Southeast wind around 5 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Showers, with thunderstorms also possible after 11am. High near 77. South wind around 5 mph. Chance of precipitation is 100%.
Saturday Night
A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 63. South wind around 5 mph becoming calm.
Sunday
A chance of showers and thunderstorms between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 78. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a slight chance of showers after 2am. Low around 63. Chance of precipitation is 80%.
Memorial Day
A slight chance of showers, then showers and possibly a thunderstorm after 8am. High near 77. Chance of precipitation is 90%.
Monday Night
Showers and thunderstorms. Low around 63. Chance of precipitation is 80%.
Tuesday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
Tuesday Night
Showers and thunderstorms. Low around 63. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Flag Pond TN
 36.04°N 82.54°W (Elev. 2201 ft)
Last Update:
7:06 pm EDT May 20, 2026
Forecast Valid:
12am EDT May 21, 2026-6pm EDT May 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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