Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 69, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 4, 2017, 1:59 PM MDT for Pennington County, South Dakota. It was in force for 28 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 4, 2017, 1:59 PM MDT (19:59 UTC)
- Expired
- Jul 4, 2017, 2:27 PM MDT
- In force
- 28 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Pennington County, SD
The radar
The Rapid City radar (KUDX), 13 km from the middle of the area, began a volume at 20:02 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 8.0 hours before the alert went out and 349 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
- 1122 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 1795 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 4, 11:00 AM MDT, 2 hours 59 minutes earlier.
Area forecast discussion, Jul 4, 11:00 AM MDT, 2 hours 59 minutes before
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</html>Hazardous weather outlook, Jul 4, 2:27 AM MDT, 11 hours 32 minutes before
Hazardous Weather Outlook National Weather Service Rapid City SD 227 AM MDT Tue Jul 4 2017 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-051300- Harding-Perkins-Butte-Northern Meade Co Plains-Ziebach- Northern Black Hills-Northern Foot Hills-Rapid City- Southern Foot Hills-Central Black Hills-Southern Black Hills- Custer Co Plains-Pennington Co Plains-Haakon-Fall River- Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp- Sturgis/Piedmont Foot Hills-Southern Meade Co Plains- Hermosa Foot Hills-Northern Campbell-Southern Campbell- Western Crook-Wyoming Black Hills-Weston-Northeastern Crook- 227 AM MDT Tue Jul 4 2017 /327 AM CDT Tue Jul 4 2017/ This Hazardous weather outlook is for western South Dakota and Northeastern Wyoming. .DAY ONE...Today and Tonight Isolated to scattered thunderstorms are expected this afternoon mainly across the Black Hills area and western South Dakota. A few strong thunderstorms with small hail and gusty winds are possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Hot and dry weather is expected this week. Daily minimum relative humidities will average 15 to 25 percent. The warmest days will be Wednesday and Thursday with temperatures reaching well into the 90s to near 100. Elevated fire danger will result. Isolated to scattered thunderstorms are also expected Thursday into early next week. A few strong thunderstorms with small hail and gusty winds are possible. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity
In the hours before
Special weather statement, Jul 4, 1:46 PM MDT, 13 minutes before
Special Weather Statement National Weather Service Rapid City SD 146 PM MDT TUE JUL 4 2017 SDZ024-026-028-072-042030- Northern Black Hills SD-Central Black Hills SD- Sturgis/Piedmont Foot Hills SD-Rapid City SD- 146 PM MDT TUE JUL 4 2017 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MEADE...SOUTHEASTERN LAWRENCE AND CENTRAL PENNINGTON COUNTIES UNTIL 230 PM MDT... At 145 PM MDT, Doppler radar was tracking a strong thunderstorm near Johnson Siding, or 9 miles west of Rapid City, moving east at 15 mph. Dime size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Southwestern Rapid City, Black Hawk, Summerset, Johnson Siding, Nemo, Hisega and Pactola Reservoir. This Includes Interstate 90 in South Dakota between Mile Markers 51 and 56. LAT...LON 4410 10356 4422 10354 4416 10323 4397 10332 TIME...MOT...LOC 1945Z 288DEG 13KT 4413 10343 Pojorlie
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 6:48 PM MDT | Special Weather Statement | UNR | Bennett | 57 min |
| Jul 4, 1:46 PM MDT | Special Weather Statement | UNR | Lawrence | 44 min |
| Jul 4, 2:22 PM MDT | Special Weather Statement | UNR | Perkins | 38 min |
| Jul 4, 2:42 PM MDT | Special Weather Statement | UNR | Lawrence | 48 min |
| Jul 4, 3:12 PM MDT | Special Weather Statement | UNR | Perkins | 48 min |
| Jul 4, 3:34 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins, Ziebach | 56 min |
| Jul 4, 4:01 PM MDT | Special Weather Statement | UNR | Custer | 44 min |
| Jul 4, 4:26 PM MDT | Severe Thunderstorm Warning | UNR | Meade, Perkins, Ziebach | 49 min |
| Jul 4, 5:44 PM MDT | Special Weather Statement | UNR | Meade | 46 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2017Every severe thunderstorm warning in 2017
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.