Alert archive / South Dakota / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 30, NWS Aberdeen, SD
NWS Aberdeen, SD issued this severe thunderstorm warning at May 21, 2007, 8:22 PM MDT for Corson County, South Dakota. It was in force for 23 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
- May 21, 2007, 8:22 PM MDT (02:22 UTC)
- Expired
- May 21, 2007, 8:45 PM MDT
- In force
- 23 min
- Issued by
- NWS Aberdeen, SD
- Area
- Counties, with a storm outline in the text
County Corson County, SD
The radar
The Bismarck radar (KBIS), 123 km from the middle of the area, began a volume at 02:23 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 21, 1:52 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 2.4 hours before the alert went out and 124 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1843 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 1774 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.2
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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 7:46 PM MDT, 36 minutes earlier.
Area forecast discussion, May 21, 7:46 PM MDT, 36 minutes before
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</html>Hazardous weather outlook, May 21, 4:46 AM MDT, 15 hours 36 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE ABERDEEN SD 546 AM CDT MON MAY 21 2007 SDZ003>005-007-009>011-015>017-019-033>037-045-048-051-221100- CORSON-CAMPBELL-MCPHERSON-MARSHALL-WALWORTH-EDMUNDS-DAY-DEWEY- POTTER-FAULK-CLARK-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES-LYMAN- BUFFALO- 546 AM CDT MON MAY 21 2007 /446 AM MDT MON MAY 21 2007/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND NORTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS CENTRAL AND NORTHEAST SOUTH DAKOTA TODAY INTO TONIGHT...AS A LOW PRESSURE SYSTEM SLIDES EAST OUT OF EASTERN WYOMING. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON INTO TONIGHT. BESIDES THE THREAT OF DANGEROUS LIGHTNING...THE MAIN SEVERE THUNDERSTORM THREATS ARE LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE ACTIVE PATTERN WILL CONTINUE ACROSS THE AREA INTO TUESDAY AND WEDNESDAY...BRINGING ADDITIONAL CHANCES FOR SHOWERS AND THUNDERSTORMS. AT THIS TIME SMALL HAIL...STRONG WINDS...HEAVY RAINFALL AND FREQUENT LIGHTNING ARE THE MAIN THREATS WITH ANY THUNDERSTORM DEVELOPMENT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON INTO TONIGHT. SDZ006-018-221100- BROWN-SPINK- 546 AM CDT MON MAY 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS CENTRAL AND NORTHEAST SOUTH DAKOTA TODAY INTO TONIGHT...AS A LOW PRESSURE SYSTEM SLIDES EAST OUT OF EASTERN WYOMING. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON INTO TONIGHT. BESIDES THE THREAT OF DANGEROUS LIGHTNING...THE MAIN SEVERE THUNDERSTORM THREATS ARE LARGE HAIL AND DAMAGING WINDS. FLOODING IS EXPECTED TO CONTINUE ON THE JAMES RIVER FOR AN EXTENDED PORTION OF TIME. SEE THE LATEST FLOOD STATEMENT FOR SPECIFIC RIVER STAGE INFORMATION. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE ACTIVE PATTERN WILL CONTINUE ACROSS THE AREA INTO TUESDAY AND WEDNESDAY...BRINGING ADDITIONAL CHANCES FOR SHOWERS AND THUNDERSTORMS. AT THIS TIME SMALL HAIL...STRONG WINDS...HEAVY RAINFALL AND FREQUENT LIGHTNING ARE THE MAIN THREATS WITH ANY THUNDERSTORM DEVELOPMENT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING INTO TONIGHT. MNZ039-046-SDZ008-020>023-221100- TRAVERSE-BIG STONE-ROBERTS-CODINGTON-GRANT-HAMLIN-DEUEL- 546 AM CDT MON MAY 21 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT THE CHANCE FOR SHOWERS AND THUNDERSTORMS EXISTS ACROSS NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA TODAY INTO TONIGHT...AS A LOW PRESSURE SYSTEM SLIDES EAST OUT OF EASTERN WYOMING. THERE IS A POSSIBILITY FOR SEVERE WEATHER TONIGHT. BESIDES THE THREAT OF DANGEROUS LIGHTNING...THE MAIN SEVERE THUNDERSTORM THREATS ARE LARGE HAIL AND DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE ACTIVE PATTERN WILL CONTINUE ACROSS THE AREA INTO TUESDAY AND WEDNESDAY...BRINGING ADDITIONAL CHANCES FOR SHOWERS AND THUNDERSTORMS. AT THIS TIME SMALL HAIL...STRONG WINDS...HEAVY RAINFALL AND FREQUENT LIGHTNING ARE THE MAIN THREATS WITH ANY THUNDERSTORM DEVELOPMENT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT. ALBRECHT
In the hours before
Local storm report, May 21, 7:21 PM MDT, 1 hour 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
821 PM CDT MON MAY 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0818 PM HAIL 3 SE ISABEL 45.37N 101.38W
05/21/2007 E0.75 INCH DEWEY SD PUBLIC
A FEW PENNEY SIZED.
&&
GILLESPIELocal storm report, May 21, 7:21 PM MDT, 1 hour 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
821 PM CDT MON MAY 21 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 PM HAIL 3 SE ISABEL 45.37N 101.38W
05/21/2007 E0.75 INCH DEWEY SD PUBLIC
A FEW PENNEY SIZED.
&&
GILLESPIELocal storm report, May 21, 7:42 PM MDT, 40 minutes before
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</html>Local storm report, May 21, 7:54 PM MDT, 28 minutes before
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</html>The office that day
Everything else NWS Aberdeen, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 6:18 PM MDT | Severe Thunderstorm Warning | ABR | Dewey | 57 min |
| May 21, 6:54 PM MDT | Severe Thunderstorm Warning | ABR | Corson | 66 min |
| May 21, 7:23 PM MDT | Severe Thunderstorm Warning | ABR | Corson, Dewey | 13 min |
| May 21, 7:27 PM MDT | Severe Thunderstorm Warning | ABR | Corson | 63 min |
| May 22, 1:34 PM MDT | Severe Thunderstorm Warning | ABR | Hughes, Lyman | 41 min |
| May 22, 2:04 PM MDT | Severe Thunderstorm Warning | ABR | Hughes, Hyde, Lyman | 41 min |
| May 22, 2:46 PM MDT | Severe Thunderstorm Warning | ABR | Hand, Hyde | 44 min |
| May 22, 4:02 PM MDT | Severe Thunderstorm Warning | ABR | Brown, Spink | 43 min |
| May 22, 4:24 PM MDT | Flash Flood Warning | ABR | Brown, Spink | 6 hr |
| May 22, 4:42 PM MDT | Severe Thunderstorm Warning | ABR | Brown | 27 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2007Every severe thunderstorm warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.