Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

91°F

33°C

Humidity	56%
Wind Speed	S 8 mph
Barometer	30.06 in
Dewpoint	73°F (23°C)
Visibility	10.00 mi
Heat Index	100°F (38°C)
Last update	17 Aug 11:50 am CDT

More Information:

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

Extended Forecast for

4 Miles NE Willis OK

Heat Advisory August 18, 12:00pm until August 18, 08:00pm

Heat Advisory August 17, 01:00pm until August 17, 08:00pm

Click here for hazard details and duration

Heat Advisory

This Afternoon
High: 96 °F
Slight Chance
T-storms
Tonight
Low: 77 °F
Partly Cloudy
Monday
High: 98 °F
Sunny then
Slight Chance
T-storms
Monday Night
Low: 77 °F
Slight Chance
T-storms
Tuesday
High: 99 °F
Sunny then
Slight Chance
T-storms
Tuesday Night
Low: 76 °F
Mostly Clear
then Slight
Chance
T-storms
Wednesday
High: 96 °F
Chance
Showers then
Chance
T-storms
Wednesday Night
Low: 73 °F
Slight Chance
T-storms
Thursday
High: 94 °F
Chance
T-storms

Detailed Forecast

This Afternoon

A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Heat index values as high as 105. South wind around 8 mph.

Tonight

Partly cloudy, with a low around 77. South wind around 6 mph becoming calm in the evening.

Monday

A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 20%.

Monday Night

A slight chance of thunderstorms before 7pm. Mostly clear, with a low around 77. Light south southeast wind. Chance of precipitation is 10%.

Tuesday

A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 99. Light and variable wind.

Tuesday Night

A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 76.

Wednesday

A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 96. Chance of precipitation is 50%.

Wednesday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

Thursday

A 30 percent chance of showers and thunderstorms, mainly after 1pm. Sunny, with a high near 94.