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Storm Reports
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Severe Storms/Heat/Eclipse on August 18-21, 2017
 
Troughing at 500 millibars (18,000 feet) and a push of cooler air did not extend as far south on 08/18/2017 as it did earlier in the month. Even so, it was enough to trigger scattered severe thunderstorms in Arkansas.
500 mb Map at 700 am CDT (08/18)  |  500 mb Map at 700 am CDT (08/04)
In the pictures: Troughing at 500 millibars (18,000 feet) and a push of cooler air did not extend as far south on 08/18/2017 as it did earlier in the month. Even so, it was enough to trigger scattered severe thunderstorms in Arkansas.
 

Through mid-August, it was a mild month overall. At Little Rock (Pulaski County), for example, temperatures were at least four degrees below average on twelve of the first seventeen days. Highs reached 90 degrees only two times. A cold front/more cool air was on the doorstep on the 18th. This time, the front did not penetrate into Arkansas, and hot weather was just around the corner.

 

The WSR-88D (Doppler Weather Radar) and satellite showers showers and thunderstorms building from northwest into central Arkansas during the evening of 08/18/2017. The images are courtesy of the Iowa Environmental Mesonet.
Radar/Satellite at 700 pm CDT (08/18)  |  Radar/Satellite at 800 pm CDT (08/18)
Radar/Satellite at 900 pm CDT (08/18)  |  Radar/Satellite at 1000 pm CDT (08/18)
Radar/Satellite at 1100 pm CDT (08/18)  |  Radar/Satellite at 1200 am CDT (08/18)
In the pictures: The WSR-88D (Doppler Weather Radar) and satellite showers showers and thunderstorms building from northwest into central Arkansas during the evening of 08/18/2017. The images are courtesy of the Iowa Environmental Mesonet. 
 

The front (from the Plains) got close enough to trigger scattered showers and thunderstorms during the evening of the 18th. Several of these were severe in northern and central sections of the state.

 

Warnings for severe thunderstorms and flash flooding were posted from northwest into central Arkansas during the evening of 08/18/2017.
In the picture: Warnings for severe thunderstorms and flash flooding were posted from northwest into central Arkansas during the evening of 08/18/2017.
 

Ten miles southwest of Harrison (Boone County), a barn was destroyed by damaging straight-line winds. Trees and power lines were blown down just northeast of Subiaco (Logan County) on Highways 197 and 288, and also along Highway 22 at Midway (Logan County). Trees were toppled along Highway 27 at Havana (Yell County). A quick one to two inches of rain flooded a road in Sherwood (Pulaski County).

Isolated storms redeveloped on the 19th, mainly across northern Arkansas. One storm produced quarter size hail at Rodney (Baxter County).

 

Heat index values were projected to exceed 105 degrees across much of central and southern Arkansas on 08/20/2017.
In the picture: Heat index values were projected to exceed 105 degrees across much of central and southern Arkansas on 08/20/2017.
 

The heat cranked up on the 19th and 20th. Heat Advisories (for heat index values of 105 degrees or greater) were posted across the central and southern counties. On the 19th, it was 97 degrees at Fort Smith (Sebastian County) and Hot Springs (Garland County), and 96 degrees at El Dorado (Union County) and Mount Ida (Montgomery County). Overall, it was even hotter on the 20th, with many locations in the mid and upper 90s.

 

The satellite showed the moon's shadow over Wyoming at 1247 am CDT on 08/21/2017. This was roughly 25 to 35 minutes before projected maximum eclipse times for places in Arkansas (110 pm to 125 pm CDT).
Moon's Shadow over Wyoming (08/21)  |  Projected Eclipse Times (08/21)
In the pictures: The satellite showed the moon's shadow over Wyoming at 1247 am CDT on 08/21/2017. This was roughly 25 to 35 minutes before projected maximum eclipse times for places in Arkansas (110 pm to 125 pm CDT).
 

There was a little relief on the 21st, but not from clouds and/or showers. A partial eclipse was noted, with the sun obscured by the moon by as much as 82 percent in the southwest to 97 percent in the northeast. This happened during the heat of the early afternoon. Temperatures dropped more than five degrees in some cases, especially in the north/east (where obscurations were highest).

 

 

More than six inches of rain fell on the south side of Kansas City, MO in the twenty four hour period ending at 700 am CDT on 08/22/2017. Rapid rises and a record crest occurred along Indian Creek at Overland Park, KS.
24-Hour Rainfall (08/22)  |  Indian Creek Hydrograph (08/22)
In the pictures: More than six inches of rain fell on the south side of Kansas City, MO in the twenty four hour period ending at 700 am CDT on 08/22/2017. Rapid rises and a record crest occurred along Indian Creek at Overland Park, KS.
 

Following the eclipse (mostly after dark on the 21st), rain came in buckets at Kansas City, MO. Amounts exceeded six inches on the south side of town. There were dozens of high water rescues (people stranded in flooded areas). Rising water forced a family of seven to go to the roof of a home. A woman found safety in a tree to escape record flooding along Indian Creek. Several schools were closed on the 22nd. This was the second such event locally in less than three weeks.

 

Storm Reports
Preliminary reports of severe weather and flash flooding in the Little Rock County Warning Area on August 18-19, 2017 (in red).
Submit a storm report.
There were a few reports of damaging winds, large hail, and flash flooding in northern and central Arkansas on August 18th/19th. For a look at the reports, click here.
 
Link of Interest
Plot Reports
In the picture: Preliminary reports of severe weather and flash flooding in the Little Rock County Warning Area on August 18-19, 2017 (in red).