Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 154, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 1, 2011, 10:33 AM CDT for Tripp County, South Dakota. It was in force for 51 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 1, 2011, 10:33 AM CDT (15:33 UTC)
- Expired
- Jul 1, 2011, 11:24 AM CDT
- In force
- 51 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Tripp County, SD
The radar
The North Platte radar (KLNX), 164 km from the middle of the area, began a volume at 15:34 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 12:00Z, 3.6 hours before the alert went out and 209 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
- 407 J/kg
- Mixed-layer CIN
- -374 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- -270 m²/s²
- 0-3 km storm-relative helicity
- -229 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 1, 3:00 AM CDT, 7 hours 33 minutes earlier.
Area forecast discussion, Jul 1, 3:00 AM CDT, 7 hours 33 minutes before
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</html>Hazardous weather outlook, Jul 1, 5:35 AM CDT, 4 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 435 AM MDT FRI JUL 1 2011 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-021300- 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- 435 AM MDT (535 AM CDT) FRI JUL 1 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE AREA TODAY. SEVERE STORMS ARE NOT EXPECTED. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE AREA SATURDAY INTO SATURDAY NIGHT. WIDESPREAD SEVERE STORMS ARE NOT EXPECTED AT THIS TIME...BUT A FEW STORMS COULD BE STRONG TO SEVERE...ESPECIALLY ACROSS THE BLACK HILLS AREA. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
In the hours before
Special weather statement, Jul 1, 8:30 AM CDT, 2 hours 3 minutes before
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</html>Special weather statement, Jul 1, 10:07 AM CDT, 26 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RAPID CITY SD 907 AM MDT FRI JUL 1 2011 SDZ046-047-049-011600- MELLETTE SD-TODD SD-TRIPP SD- 1007 AM CDT FRI JUL 1 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN MELLETTE...EASTERN TODD AND TRIPP COUNTIES UNTIL 1100 AM CDT... AT 1002 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM WITTEN TO 10 MILES EAST OF SPARKS...AND MOVING NORTH AT 30 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE... WINNER... CLEARFIELD... MILLBORO... IDEAL... WEWELA... COLOME... HAMILL... SANDERS
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 7:37 PM CDT | Flash Flood Warning | UNR | 3 hr | |
| Jun 30, 8:31 PM CDT | Severe Thunderstorm Warning | UNR | Bennett, Todd | 59 min |
| Jun 30, 9:14 PM CDT | Severe Thunderstorm Warning | UNR | Mellette, Todd, Tripp | 61 min |
| Jun 30, 9:46 PM CDT | Severe Thunderstorm Warning | UNR | Tripp | 29 min |
| Jun 30, 9:53 PM CDT | Severe Thunderstorm Warning | UNR | Mellette | 52 min |
| Jun 30, 10:03 PM CDT | Severe Thunderstorm Warning | UNR | Butte, Harding | 57 min |
| Jun 30, 10:09 PM CDT | Severe Thunderstorm Warning | UNR | Mellette, Tripp | 41 min |
| Jul 1, 3:13 PM CDT | Flash Flood Warning | UNR | Butte | 3 hr |
| Jun 30, 7:43 PM CDT | Severe Thunderstorm Warning | UNR | Campbell | 47 min |
| Jun 30, 8:13 PM CDT | Severe Thunderstorm Warning | UNR | Crook | 62 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.