Alert archive / South Dakota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 222, NWS Sioux Falls, SD

August 12, 2009Brule County, Charles Mix County, Gregory County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 12, 2009, 9:17 PM CDT for Brule County, Charles Mix County, Gregory County, South Dakota. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 12, 2009, 9:17 PM CDT (02:17 UTC)
Expired: Aug 12, 2009, 10:15 PM CDT
In force: 58 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

Counties Brule County, SD, Charles Mix County, SD, Gregory County, SD

The radar

The Sioux Falls radar (KFSD), 181 km from the middle of the area, began a volume at 02:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 3:30 PM CDT, 5 hours 47 minutes earlier.

Area forecast discussion, Aug 12, 3:30 PM CDT, 5 hours 47 minutes before

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Hazardous weather outlook, Aug 12, 11:27 AM CDT, 9 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1127 AM CDT WED AUG 12 2009

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-131200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
1127 AM CDT WED AUG 12 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
SCATTERED THUNDERSTORMS SHOULD DEVELOP NEAR THE MISSOURI RIVER
VALLEY LATE THIS AFTERNOON AND EARLY EVENING...THEN SPREAD EAST
AND NORTHEAST INTO THE AREA TONIGHT...ESPECIALLY ALONG AND SOUTH
OF INTERSTATE 90. A FEW SEVERE STORMS WITH HAIL UP TO THE SIZE OF
HALF DOLLARS AND WIND GUSTS TO 60 MPH ARE POSSIBLE SOUTHWEST OF A
LINE FROM CHAMBERLAIN TO MITCHELL TO SIOUX CITY INTO THE EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE REGION THIS
WEEKEND.  SOME OF THE STRONGER STORMS MAY BE CAPABLE OF PRODUCING
LARGE HAIL AND WIND GUSTS TO AROUND 60 MPH.  SOME AREAS OF VERY
HEAVY RAINFALL ARE ALSO POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 5 PM CDT SOUTHWEST OF A
LINE FROM CHAMBERLAIN TO MITCHELL TO SIOUX CITY.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

RSR

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 10:10 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas	50 min
Aug 12, 10:31 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	29 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.