Severe Thunderstorm Areas This Saturday; Excessive Heat in the Southern U.S.

Damaging thunderstorm winds and a few tornadoes with areas of excessive rainfall are possible today over parts of the lower Great Lakes to upper Ohio Valley and Mid-Atlantic, the Ozarks, and south-central High Plains. Excessive heat will continue over the southern U.S. this weekend before another round of heat arrives Monday through the central and southern U.S. spreading into the East by midweek. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Mostly Cloudy

99°F

37°C

Humidity	44%
Wind Speed	S 8 mph
Barometer	30.02 in
Dewpoint	73°F (23°C)
Visibility	10.00 mi
Heat Index	110°F (43°C)
Last update	29 Jun 2:50 pm CDT

More Information:

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

Extended Forecast for

Denison TX

Heat Advisory June 29, 07:00pm until June 30, 07:00pm

Excessive Heat Warning June 29, 03:20pm until June 29, 07:00pm

Click here for hazard details and duration

Heat Advisory

Excessive Heat Warning

Excessive Heat Warning June 29, 03:20pm until June 29, 07:00pm
NOW until 7:00pm Sat
Excessive Heat Warning
This Afternoon
High: 99 °F
Hot
Tonight
Low: 80 °F
Mostly Clear
Sunday
High: 96 °F
Slight Chance
Showers then
Slight Chance
T-storms
Sunday Night
Low: 78 °F
Partly Cloudy
Monday
High: 98 °F
Sunny
Monday Night
Low: 79 °F
Mostly Clear
Tuesday
High: 100 °F
Hot
Tuesday Night
Low: 80 °F
Mostly Clear

Detailed Forecast

This Afternoon

Mostly sunny and hot, with a high near 99. Heat index values as high as 109. South wind around 5 mph.

Tonight

Mostly clear, with a low around 80. South southeast wind around 5 mph.

Sunday

A slight chance of showers before 1pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 96. Heat index values as high as 105. South southwest wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 20%.

Sunday Night

Partly cloudy, with a low around 78. East southeast wind around 5 mph becoming calm in the evening.

Monday

Sunny, with a high near 98. South southeast wind around 5 mph.

Monday Night

Mostly clear, with a low around 79. South southeast wind around 5 mph.

Tuesday

Sunny and hot, with a high near 100. South wind 5 to 10 mph.

Tuesday Night

Mostly clear, with a low around 80. South southeast wind around 10 mph.

Wednesday

Sunny and hot, with a high near 100. South wind 5 to 10 mph.