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Severe Thunderstorms and Heavy Rain in Upper Midwest

A slow moving frontal boundary from the central Pains to the Upper Midwest will bring a potential for severe thunderstorms and heavy rain. Rain amounts of 1-3 inches, with locally heavier amounts can be expected. The threat of severe weather moves into the Ohio Valley and Northeast on Tuesday. Monsoon moisture continues to bring the threat of flash flooding to the Southwest and southern Rockies. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

76°F

24°C

Humidity 88%
Wind Speed S 9 mph
Barometer 30.06 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 21 Aug 6:15 am CDT
Extended Forecast for

Grayson County Airport TX

  • Today

    Today: Sunny, with a high near 95. Heat index values as high as 102. South southeast wind 5 to 10 mph.

    Sunny

    High: 95 °F

  • Tonight

    Tonight: Mostly clear, with a low around 75. South southeast wind around 10 mph.

    Mostly Clear

    Low: 75 °F

  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 101. South southwest wind 5 to 10 mph.

    Mostly Sunny

    High: 94 °F

  • Tuesday
    Night

    Tuesday Night: Showers and thunderstorms likely, mainly after 1am.  Mostly cloudy, with a low around 73. South southeast wind around 5 mph becoming calm  after midnight.  Chance of precipitation is 60%.

    T-storms
    Likely

    Low: 73 °F

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms.  Partly sunny, with a high near 89. North northeast wind 5 to 10 mph.

    Chance
    T-storms

    High: 89 °F

  • Wednesday
    Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 70. East northeast wind around 5 mph.

    Slight Chance
    T-storms

    Low: 70 °F

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 86. East wind 5 to 10 mph.

    Slight Chance
    T-storms

    High: 86 °F

  • Thursday
    Night

    Thursday Night: Mostly cloudy, with a low around 68. East southeast wind 5 to 10 mph.

    Mostly Cloudy

    Low: 68 °F

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 86. East wind around 10 mph.

    Slight Chance
    T-storms

    High: 86 °F

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 102. South southeast wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 75. South southeast wind around 10 mph.
Tuesday
Mostly sunny, with a high near 94. Heat index values as high as 101. South southwest wind 5 to 10 mph.
Tuesday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 73. South southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. North northeast wind 5 to 10 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. East northeast wind around 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. East wind 5 to 10 mph.
Thursday Night
Mostly cloudy, with a low around 68. East southeast wind 5 to 10 mph.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. East wind around 10 mph.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86.
Click Map For Forecast
Point Forecast:
Grayson County Airport TX
 33.73°N 96.68°W (Elev. 715 ft)
3:33 am CDT Aug 21, 2017
6am CDT Aug 21, 2017-6pm CDT Aug 27, 2017
 
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