Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

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Last Map Update: Mon, Aug 17, 2026 at 9:30:21 pm EDT

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National Weather Service Atlanta/Peachtree City, GA

National Weather Service Greenville-Spartanburg, SC

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Smoky Mtn Observations

Just some minor tweaks to the Slight Risk (2/5) area for the afternoon update. Strong to damaging winds, heavy rain, and frequent lightning will all be possible beneath thunderstorms this afternoon and evening. Make sure to have multiple ways to receive any watch or warning information. If thunder roars, go indoors.

A few isolated showers and storms will remain across the area prior to midnight. Then, fog develops overnight and into Tuesday morning. Drier weather is expected for Tuesday and Wednesday, and afternoon humidity will be lower both days.

Each observation point is apart of our COOP program (Cooperative Observer Program). Each site has a 24 hour observation period that ends and begins at 8 am local time. Each site records temperature, precipitation, and snowfall data. More information about the COOP program can be found here www.nws.noaa.gov/om/coop/ Data began being collected at: Cades Cover on 01/01/1999 || Mount LeConte on 07/01/1987 || Newfound Gap on 01/01/1991 || Sugarlands Visitor Center on 12/01/1921

Current Weather Observations...

Location	Time (EDT)	Weather	Vsby. (SM)	Temp. (ºF)	Dewpt. (ºF)	Hum. (%)	Wind (mph)	Wind Chill / Heat Index (ºF)	Pres. (in)
Abingdon VA	21:15	Lightning Observed	9	69	68	94	SSE 5	-	30.04
Andrews-Murphy NC	20:55	Light Rain	10	71	68	92	CALM	-	30.08
Chattanooga TN	21:16	Thunder In The Vicinity \ Lightning Observed	10	77	72	84	E 5	-	30.01
Crossville TN	20:53	Clear	10	74	72	93	CALM	-	30.04
Dalton GA	21:15	Light Rain With Thunder \ Mist	2 1/2	74	74	100	VRB 6	-	30.04
Knoxville TN (McGhee-Tyson)	20:53	Cumulonimbus Clouds, Lightning Observed	10	75	72	90	W 6	-	29.98
Middlesboro KY	21:15	Mostly Cloudy	10	73	73	100	CALM	-	30.01
Monroe Cnty TN	20:55	Clear	10	71	71	100	WSW 7	-	30.00
Morristown TN	21:15	Overcast	10	71	71	100	CALM	-	30.00
Oak Ridge TN	20:53	Clear	10	74	73	97	CALM	-	30.00
Tazewell Cnty VA	12:35	Mostly Cloudy	10	77	70	80	W 6	-	30.14
Tri-Cities TN	20:53	Lightning Observed	10	72	70	93	WSW 3	-	30.01
Wise VA	21:15	Light Rain With Thunder \ Lightning Observed	5	69	69	100	SSE 3	-	30.06
Greeneville, TN	20:55	Overcast	10	71	69	94	CALM	-	30.00

Local Weather History For August 17th...

In 2010, slow moving storms created flooding northeast TN and southwest VA. 1 drowned.


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Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

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