Alert archive / South Dakota / Flash Flood Warnings in 2009
Flash Flood Warning 17, NWS Aberdeen, SD
NWS Aberdeen, SD issued this flash flood warning at Aug 18, 2009, 11:12 PM CDT for 5 counties in South Dakota. It was in force for 4 hr. 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 18, 2009, 11:12 PM CDT (04:12 UTC)
- Expired
- Aug 19, 2009, 3:18 AM CDT
- In force
- 4 hr
- Issued by
- NWS Aberdeen, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Brown County, SD, Day County, SD, Grant County, SD, Roberts County, SD, Spink County, SD
The radar
The Aberdeen radar (KABR), 64 km from the middle of the area, began a volume at 04:15 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 nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 4.2 hours before the alert went out and 79 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
- 5 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 2192 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Aug 18, 10:54 PM CDT, 18 minutes earlier.
Area forecast discussion, Aug 18, 10:54 PM CDT, 18 minutes before
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HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE ABERDEEN SD 353 PM CDT TUE AUG 18 2009 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-192100- TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL- ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK- CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES- LYMAN-BUFFALO- 353 PM CDT TUE AUG 18 2009 /253 PM MDT TUE AUG 18 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND NORTHEAST SOUTH DAKOTA. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON AND EVENING ACROSS SOUTH CENTRAL SOUTH DAKOTA...INCLUDING THE INTERSTATE 90 CORRIDOR. THUNDERSTORMS SHOULD MEANDER NORTHEAST AND CONTINUE TO DEVELOP THROUGH THE OVERNIGHT HOURS...INTO WEDNESDAY MORNING ACROSS FAR NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA. A FEW OF THESE STORMS COULD BECOME SEVERE ACROSS SOUTH CENTRAL SOUTH DAKOTA THIS EVENING WITH HAIL AND GUSTY WINDS BEING THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ON WEDNESDAY AFTERNOON...SCATTERED TO NUMEROUS THUNDERSTORMS SHOULD BE WORKING OVER THE FORECAST AREA. ON THURSDAY...ISOLATED TO SCATTERED THUNDERSTORMS ARE AGAIN POSSIBLE IN THE AFTERNOON...MAINLY ACROSS FAR NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA. THUNDERSTORMS THAT DEVELOP DURING THESE TIME PERIODS ARE NOT EXPECTED TO BECOME SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. TMT
In the hours before
Special weather statement, Aug 18, 5:45 PM CDT, 5 hours 27 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 545 PM CDT TUE AUG 18 2009 SDZ015-033-034-182315- DEWEY-STANLEY-SULLY- 445 PM MDT TUE AUG 18 2009 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR NORTHERN STANLEY...SOUTHERN DEWEY AND WESTERN SULLY COUNTIES UNTIL 515 PM MDT/615 PM CDT/... AT 444 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 5 MILES NORTHWEST OF MISSION RIDGE...OR 26 MILES SOUTHEAST OF EAGLE BUTTE...MOVING EAST AT 20 MPH. A FEW LOCATIONS IN THE ADVISORY INCLUDE MISSION RIDGE. PENNY TO NICKEL SIZE HAIL...AND WINDS AROUND 40 TO 50 MPH ARE EXPECTED WITH THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF ON OR NEAR LAKE OAHE NORTH OF MISSION RIDGE...GET OUT OF THE WATER. LIGHTNING CAN STRIKE OUT TO 15 MILES FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && TDK
Local storm report, Aug 18, 7:21 PM CDT, 3 hours 51 minutes before
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</html>Local storm report, Aug 18, 8:23 PM CDT, 2 hours 49 minutes before
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</html>Local storm report, Aug 18, 8:51 PM CDT, 2 hours 21 minutes before
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</html>Special weather statement, Aug 18, 10:30 PM CDT, 42 minutes before
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</html>Local storm report, Aug 18, 10:39 PM CDT, 33 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 |
|---|---|---|---|---|
| Aug 18, 7:27 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Sully | 48 min |
| Aug 18, 7:49 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Sully | 26 min |
| Aug 18, 8:15 PM CDT | Severe Thunderstorm Warning | ABR | Hughes, Hyde | 60 min |
| Aug 18, 8:45 PM CDT | Flash Flood Warning | ABR | Hughes | 6 hr |
| Aug 18, 10:14 PM CDT | Areal Flood Advisory | ABR | Brown, Day, Edmunds, Faulk, Spink | 5 hr |
Nearby
Flash Flood Warnings in South Dakota, 2009Every flash flood 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.