Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 232, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 25, 2011, 5:33 PM MDT for 4 counties in South Dakota. It was in force for 57 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 25, 2011, 5:33 PM MDT (23:33 UTC)
- Expired
- Jul 25, 2011, 6:30 PM MDT
- In force
- 57 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Bennett County, SD, Haakon County, SD, Jackson County, SD, Pennington County, SD
The radar
The Rapid City radar (KUDX), 82 km from the middle of the area, began a volume at 23:35 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 |
|---|---|---|---|
| Mar 3, 10:24 PM MST | Severe Thunderstorm Watch | SPC | 157 days |
| Jul 25, 1:30 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 11.6 hours before the alert went out and 83 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
- 2427 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 1325 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
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 Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 25, 12:30 PM MDT, 5 hours 3 minutes earlier.
Area forecast discussion, Jul 25, 12:30 PM MDT, 5 hours 3 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 1230 PM MDT MON JUL 25 2011 .DISCUSSION...AT 19Z SURFACE MAP SHOWS HIGH PRESSURE OVER THE ERN DAKOTAS WITH SURFACE TROF EXTENDING FROM WRN MONTANA SOUTHEAST INTO NERN WYOMING. SKIES ARE MOSTLY SUNNY WITH TEMPS IN THE UPPER 80S TO MID 90S. EXPECT TO SEE SCT CONVECTION TO DEVELOP LATER THIS AFTERNOON AND INTO TONIGHT. TONITE...UPPER TROF OVER PACIFIC NW WILL CONTINUE TO MOVE EAST PRODUCING FALLING MID-LVL HEIGHTS. SURFACE TROF OVER CENTRAL MONTANA WILL DEEPEN LATE THIS AFTERNOON AND MOVE INTO WRN SD BY 12Z TUESDAY. SURFACE FRONT CURRENTLY STRETCHES FROM WRN MONTANA SE THRU NRN BLACK HILLS INTO CENTRAL SD. STRONG HEATING WILL LEAD TO CAPE VALUES OF 2000-3000 J/KG. SURFACE BOUNDARY WILL ENHANCE LOW LEVEL CONVERGENCE. THIS WILL COMBINE WITH DEEP LAYER SHEAR AND STRONG INSTABILITY TO PRODUCE SCT TSTMS LATE THIS AFTERNOON AND CONTINUING INTO TONIGHT WITH FRONTAL BOUNDARY MAIN FOCUS FOR SVR THREAT LATE THIS AFT/TONIGHT. TUES/TUES NIGHT...SFC LOW EXPECTED TO MOVE ACRS WRN SD/SOUTHERN ND TUES AND TUES NITE. EXPECT DRY MORNING ON BACKSIDE OF MONDAY NIGHT SYSTEM. STRONG DAYTIME HEATING WILL PRODUCE CAPE VALUES OF 1500- 2500 J/KG. LI'S WILL BE -4 TO -8 WITH STRONG MID-LEVEL INSTABILITY ACROSS NRN CAMPBELL/CROOK COUNTIES AND WRN SD NORTH OF I-90. BUT INHIBITING FACTOR WILL BE CAP ACROSS SD PLAINS. EXPECT ISOLD/SCT TSTMS TO DEVELOP ACRS NERN WY/FAR WRN SD IN AFTERNOON AND CONTINUE TO MOVE EAST ACROSS SD PLAINS TUES NITE. WED/WED NITE...DAYTIME HEATING WILL AGAIN LEAD TO CAPE VALUES OF 1000-2000 J/KG WITH GOOD INSTABILITY. EXPECT TO SEE ISOLD/SCT THUNDERSTORMS DEVELOP...MAINLY IN THE AFTERNOON AND EVENING HRS. TEMPS WILL BE SEASONAL WITH HIGHS MAINLY IN THE MID 80S TO LOWER 90S. .EXTENDED...GENERALLY ZONAL FLOW MIDWEEK WILL EVOLVE INTO RIDGING OVER THE WEEKEND FOR WARMER AND DRIER CONDITIONS. TIMING OF IMPULSES THAT COULD TRIGGER THUNDERSTORMS IS DIFFICULT AT THIS RANGE...BUT SOME CONTINUITY EXISTS FOR A SMALL SHORTWAVE TO PRODUCE THUNDERSTORMS THURSDAY. LEE SIDE TROF WILL PROVIDE SURFACE CONVERGENCE FOR ISOLATED THUNDERSTORM DEVELOPEMENT. && .AVIATION...SOME STRONG TO SEVERE THUNDERSTORMS WILL DEVELOP THIS AFTERNOON INTO THIS EVENING. OTHERWISE...VFR CONDITIONS ARE EXPECTED THRU TUESDAY MORNING. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. &&
Hazardous weather outlook, Jul 25, 1:30 PM MDT, 4 hours 3 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 130 PM MDT MON JUL 25 2011 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-261300- 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- 130 PM MDT (230 PM CDT) MON JUL 25 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS WESTERN AND CENTRAL SOUTH DAKOTA...ALONG WITH OVER NORTHEAST WYOMING. LARGE HAIL AND DAMAGING WIND GUSTS WILL BE THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY AN UNSETTLED WEATHER PATTERN DEVELOPING THIS WEEK WILL BRING A DAILY CHANCE FOR THUNDERSTORMS TO VARIOUS PARTS OF THE REGION. THERE IS A SLIGHT RISK THAT SOME OF THESE STORMS MAY BECOME SEVERE ON TUESDAY AFTERNOON THROUGH EARLY WEDNESDAY FOR SOUTH CENTRAL AND PORTIONS OF WESTERN SOUTH DAKOTA...PARTICULARLY ALONG AND EAST OF A LINE FROM FAITH TO PINE RIDGE. LARGE HAIL AND DAMAGING WIND GUSTS WILL BE THE MAIN THREATS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TODAY.
In the hours before
Local storm report, Jul 25, 4:50 PM MDT, 43 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 25, 2:28 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington | 62 min |
| Jul 25, 3:08 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 67 min |
| Jul 25, 3:24 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington | 22 min |
| Jul 25, 3:59 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Lawrence | 61 min |
| Jul 25, 4:00 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Pennington | 60 min |
| Jul 25, 4:18 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 46 min |
| Jul 25, 4:23 PM MDT | Severe Thunderstorm Warning | UNR | Harding | 67 min |
| Jul 25, 4:37 PM MDT | Areal Flood Advisory | UNR | Lawrence | 50 min |
| Jul 25, 4:43 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding | 62 min |
| Jul 25, 4:44 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Pennington | 61 min |
| Jul 25, 5:00 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Pennington | 60 min |
| Jul 25, 5:10 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Pennington | 65 min |
| Jul 25, 5:16 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding, Meade, Perkins | 29 min |
| Jul 25, 5:38 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding, Meade, Perkins | 67 min |
| Jul 25, 5:52 PM MDT | Severe Thunderstorm Warning | UNR | Bennett | 53 min |
| Jul 25, 2:49 PM MDT | Severe Thunderstorm Warning | UNR | Campbell, Crook | 56 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2011Every severe thunderstorm warning in 2011
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.