Active Weather Pattern Expected From the Midwest to the Southern Plains; Dangerous Heat Likely in Southern Texas

A strong storm system will bring numerous to widespread severe thunderstorms across portions of the Midwest and Upper Great Lakes Tuesday. Tornadoes (a few strong), damaging winds and large hail are expected. Record high temperatures will be possible over southern Texas the next several days. This may lead to dangerous heat concerns especially for areas already without power. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair with Haze

78°F

26°C

Humidity	84%
Wind Speed	S 9 mph
Barometer	29.78 in
Dewpoint	73°F (23°C)
Visibility	5.00 mi
Heat Index	80°F (27°C)
Last update	21 May 10:35 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

5 Miles W Grayson County Airport TX

Tonight
Low: 71 °F
Slight Chance
T-storms
Wednesday
High: 85 °F
T-storms
Wednesday Night
Low: 66 °F
T-storms
Likely
Thursday
High: 84 °F
Slight Chance
T-storms then
Chance
T-storms
Thursday Night
Low: 70 °F
Chance
T-storms
Friday
High: 91 °F
Mostly Sunny
Friday Night
Low: 68 °F
Slight Chance
T-storms
Saturday
High: 91 °F
Mostly Sunny
Saturday Night
Low: 73 °F
Slight Chance
T-storms

Detailed Forecast

Tonight

A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. South southeast wind 5 to 10 mph.

Wednesday

Showers and thunderstorms, mainly after 10am. High near 85. South wind around 10 mph becoming northeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

Wednesday Night

Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 66. East wind around 5 mph becoming south southeast after midnight. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 84. South wind 5 to 10 mph, with gusts as high as 20 mph.

Thursday Night

A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 70. South wind 10 to 15 mph, with gusts as high as 20 mph.

Friday

Mostly sunny, with a high near 91. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

Friday Night

A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 68. Southwest wind around 5 mph becoming east after midnight.

Saturday

Mostly sunny, with a high near 91. South wind 5 to 10 mph, with gusts as high as 20 mph.

Saturday Night

A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southeast wind around 10 mph, with gusts as high as 20 mph.

Sunday

Sunny, with a high near 94.

Sunday Night

Partly cloudy, with a low around 70.

Memorial Day

Sunny, with a high near 89.

Monday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.

Tuesday

Mostly sunny, with a high near 85.