Alert archive / South Dakota / Tornado Warnings in 2009
Tornado Warning 29, NWS Rapid City, SD
NWS Rapid City, SD issued this tornado warning at Jul 13, 2009, 9:17 PM MDT for Haakon County, South Dakota. It was in force for 43 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
- Jul 13, 2009, 9:17 PM MDT (03:17 UTC)
- Expired
- Jul 13, 2009, 10:00 PM MDT
- In force
- 43 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
County Haakon County, SD
The radar
The Rapid City radar (KUDX), 105 km from the middle of the area, began a volume at 03:18 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 |
|---|---|---|---|
| Jul 13, 8:42 PM MDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 3.3 hours before the alert went out and 258 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
- 91 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1137 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Rapid City, SD wrote its last area forecast discussion before this tornado warning went out at Jul 13, 3:00 PM MDT, 6 hours 17 minutes earlier.
Area forecast discussion, Jul 13, 3:00 PM MDT, 6 hours 17 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 300 PM MDT MON JUL 13 2009 .DISCUSSION...SHORT WAVE CROSSING WRN SD THIS AFTERNOON TRIGGERING THUNDERSTORMS. SURFACE LOW OVER SOUTHEASTERN MT WITH WARM FRONT ACROSS NRN SD AND BOUNDARY/DRY LINE DRAPED ALONG WRN-SRN EDGE OF BLACK HILLS WITH DEWPTS IN THE 50S BEHIND IT AND 60S AHEAD OF IT. ANOTHER WAVE ROTATING THROUGH UPPER TROF INTO SRN MT WILL SWING ACROSS NWRN SD OVERNIGHT AS TROF PROGRESSES EWD ACROSS MT. HEAVY RAIN IS POSSIBLE OVERNIGHT...ESPECIALLY OVER NWRN SD. COLD FRONT WILL SWEEP ACROSS WRN SD TUES MORNING..WITH GUSTY NW WINDS AND DRIER AIR MOVING INTO THE AREA BEHIND IT...THOUGH NWRN SD MAY STILL SEE SOME SHOWERS AS TROF MOVES ACROS ND...AND FORECAST AREA REMAINS UNDER CYCLONIC NW FLOW FOR THE SHORT TERM. TEMPERATURES WILL BE COOLER TUESDAY INTO WED MORNING AS SURFACE HIGH BUILDS ACROSS WRN SD. THUNDERSTORMS MAY DEVELOP WED AFTERNOON AS INSTABILITY INCREASES ACROSS NERN WY AND FAR WRN SD...WITH STRONGER INSTABILITY OVER THE BLACK HILLS. TEMPS WILL WARM A FEW DEGREES WED...BUT WILL STILL BE BELOW NORMAL. AS SURFACE HIGH PUSHES SEWD...LOW LEVEL JET DEVELOPS OVER FAR SRN SD WED NIGHT...WITH A CHANCE OF THUNDERSTORMS. EXTENDED...UPPER LEVEL RIDGE WILL BUILD INTO THE WESTERN CONUS LATER THIS WEEK BRINING WARMER TEMPERATURES TO THE REGION. NORTHWEST FLOW ALOFT WITH EMBEDDED SHORTWAVES WILL BRING SLIGHT CHANCES FOR THUNDERSTORMS ACROSS MUCH OF THE CWA THROUGH THE EXTENDED PERIOD. && .AVIATION...SCATTERED STORMS WILL CONTINUE THROUGH TONIGHT AS A COLD FRONT CROSSES THE REGION. SOME OF THE THUNDERSTORMS MAY BE SEVERE WITH LARGE HAIL AND GUSTY WINDS. MVFR/IFR CONDITIONS CAN BE EXPECTED NEAR THUNDERSTORMS. OTHERWISE...VFR CONDITIONS EXPECTED. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. &&
Hazardous weather outlook, Jul 13, 10:45 AM MDT, 10 hours 32 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 1045 AM MDT MON JUL 13 2009 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-141300- BENNETT-BUTTE-CENTRAL BLACK HILLS-CUSTER CO PLAINS-FALL RIVER-HAAKON- HARDING-HERMOSA FOOT HILLS-JACKSON-MELLETTE-NORTHEASTERN CROOK- NORTHERN BLACK HILLS-NORTHERN CAMPBELL-NORTHERN FOOT HILLS- NORTHERN MEADE CO PLAINS-PENNINGTON CO PLAINS-PERKINS-RAPID CITY- SHANNON-SOUTHERN BLACK HILLS-SOUTHERN CAMPBELL-SOUTHERN FOOT HILLS- SOUTHERN MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-TODD-TRIPP- WESTERN CROOK-WESTON-WYOMING BLACK HILLS-ZIEBACH- 1045 AM MDT (1145 AM CDT) MON JUL 13 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WITH VERY LARGE HAIL AND DAMAGING WINDS OVER ALL OF NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA THIS AFTERNOON AND EVENING. ISOLATED TORNADOES ARE ALSO POSSIBLE FROM NORTHWESTERN INTO SOUTH CENTRAL SOUTH DAKOTA... OR NORTH AND EAST OF THE BLACK HILLS. LOCALLY HEAVY RAIN ALSO IS POSSIBLE WITH SOME STORMS. THUNDERSTORMS HAVE DEVELOPED OVER NORTHEASTERN WYOMING...AND WILL SPREAD EASTWARD ACROSS WESTERN SOUTH DAKOTA THIS AFTERNOON INTO THIS EVENING...AND REACHING CENTRAL SOUTH DAKOTA BY MIDNIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED WEDNESDAY AFTERNOON AND EVENING. ALTHOUGH WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED... A FEW SEVERE STORMS WITH LARGE HAIL WILL BE POSSIBLE FROM THE BLACK HILLS THROUGH SOUTHWESTERN SOUTH DAKOTA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED TODAY.
In the hours before
Local storm report, Jul 13, 8:48 PM MDT, 29 minutes before
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</html>The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 6:12 PM MDT | Tornado Warning | UNR | Butte, Lawrence | 48 min |
| Jul 13, 6:18 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Mellette | 57 min |
| Jul 13, 6:22 PM MDT | Severe Thunderstorm Warning | UNR | Fall River | 53 min |
| Jul 13, 6:34 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Meade | 56 min |
| Jul 13, 6:45 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence, Meade | 75 min |
| Jul 13, 7:03 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River | 57 min |
| Jul 13, 7:21 PM MDT | Severe Thunderstorm Warning | UNR | Custer | 39 min |
| Jul 13, 7:43 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Fall River, Pennington | 62 min |
| Jul 13, 7:43 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence, Meade, Perkins | 92 min |
| Jul 13, 7:49 PM MDT | Severe Thunderstorm Warning | UNR | Lawrence, Meade | 86 min |
| Jul 13, 7:51 PM MDT | Severe Thunderstorm Warning | UNR | 54 min | |
| Jul 13, 8:11 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Lawrence, Meade, Pennington | 79 min |
| Jul 13, 8:18 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson, Pennington | 57 min |
| Jul 13, 8:32 PM MDT | Areal Flood Advisory | UNR | Lawrence | 115 min |
| Jul 13, 8:34 PM MDT | Severe Thunderstorm Warning | UNR | Pennington | 56 min |
| Jul 13, 8:58 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Haakon, Jackson, Meade, Mellette, Pennington and 1 more | 92 min |
| Jul 13, 9:04 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Jackson, Mellette, Todd | 56 min |
| Jul 13, 9:15 PM MDT | Areal Flood Advisory | UNR | Bennett, Haakon, Jackson, Meade, Mellette, Pennington and 3 more | 9 hr |
| Jul 14, 3:17 AM MDT | Wind Advisory | UNR | Butte, Harding, Lawrence, Meade, Perkins | 17 hr |
| Jul 13, 6:27 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 47 min |
Nearby
Tornado Warnings in South Dakota, 2009Every tornado warning in 2009Tornadoes 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.