Moke Impacts Hawaii; Severe Thunderstorms and Heavy Rainfall from the Great Basin to the Plains

Heavy rain from Tropical Storm Moke will begin to impact the Big Island today, risking life-threatening flooding and mudslides in windward and southeast areas. Severe thunderstorms are expected across the northern Rockies/Plains and northern Great Basin. Repeated storms and heavy rainfall may cause flash flooding from the Plains into the Lower MS Valley. Dangerous heat persists across the South. Read More >

Hazardous Weather Conditions

Extreme Heat Warning in effect from August 23, 12:00 PM CDT until August 24, 09:00 PM CDT

Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Fair

100°F

38°C

Humidity	33%
Wind Speed	E 8 mph
Barometer	29.99 in
Dewpoint	66°F (19°C)
Visibility	10.00 mi
Heat Index	104°F (40°C)
Last update	23 Aug 12:50 pm CDT

More Information:

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

Extended Forecast for

4 Miles NNE Denison TX

Extreme Heat Warning until August 24, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning until August 24, 09:00pm
NOW until 9:00pm Mon
Extreme Heat Warning
This Afternoon
High: 106 °F
Hot
Tonight
Low: 82 °F
Mostly Clear
Monday
High: 109 °F
Hot
Monday Night
Low: 82 °F
Mostly Clear
then Slight
Chance
T-storms
Tuesday
High: 108 °F
Hot
Tuesday Night
Low: 79 °F
Partly Cloudy
Wednesday
High: 103 °F
Slight Chance
T-storms then
Slight Chance
Showers
Wednesday Night
Low: 77 °F
Partly Cloudy

Detailed Forecast

This Afternoon

Sunny and hot, with a high near 106. South wind around 5 mph.

Tonight

Mostly clear, with a low around 82. Southeast wind around 5 mph.

Monday

Mostly sunny and hot, with a high near 109. Southwest wind 5 to 10 mph.

Monday Night

A 10 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 82. South southwest wind around 10 mph.

Tuesday

Sunny and hot, with a high near 108. Southwest wind around 10 mph.

Tuesday Night

Partly cloudy, with a low around 79. South wind around 5 mph.

Wednesday

A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny and hot, with a high near 103. Southwest wind around 5 mph. Chance of precipitation is 20%.

Wednesday Night

Partly cloudy, with a low around 77. Northwest wind around 5 mph becoming calm in the evening.

Thursday

Mostly sunny and hot, with a high near 102. Calm wind becoming northeast around 5 mph in the morning.

Thursday Night

Partly cloudy, with a low around 75.

Friday

Sunny and hot, with a high near 102.

Friday Night

Mostly clear, with a low around 77.

Saturday

Sunny and hot, with a high near 103.