Alert archive / South Dakota / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 101, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 20, 2017, 5:01 PM MDT for Harding County, South Dakota. It was in force for 74 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 20, 2017, 5:01 PM MDT (23:01 UTC)
- Expired
- Jul 20, 2017, 6:15 PM MDT
- In force
- 74 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Harding County, SD
The radar
The Rapid City radar (KUDX), 170 km from the middle of the area, began a volume at 23:03 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 20, 2:50 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.0 hours before the alert went out and 253 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
- 24 J/kg
- Mixed-layer CIN
- -373 J/kg
- Mixed-layer LCL
- 1690 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 107 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 20, 3:23 PM MDT, 1 hour 38 minutes earlier.
Area forecast discussion, Jul 20, 3:23 PM MDT, 1 hour 38 minutes before
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</html>Hazardous weather outlook, Jul 20, 10:59 AM MDT, 6 hours 2 minutes before
Hazardous Weather Outlook National Weather Service Rapid City SD 1059 AM MDT Thu Jul 20 2017 SDZ013-014-024>031-041-072>074-WYZ054>058-071-211300- 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-Fall River-Sturgis/Piedmont Foot Hills- Southern Meade Co Plains-Hermosa Foot Hills-Northern Campbell- Southern Campbell-Western Crook-Wyoming Black Hills-Weston- Northeastern Crook- 1059 AM MDT Thu Jul 20 2017 This Hazardous weather outlook is for portions of the Black Hills of South Dakota...western South Dakota...northeast Wyoming...and the Black Hills of Wyoming. .DAY ONE...Today and Tonight Isolated to scattered showers and thunderstorms will develop late this afternoon into this evening. Some of these storms will be strong to severe with large hail and damaging winds possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday After a quiet weekend, an active weather pattern will return early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ001-002-012-211300- Harding-Perkins-Butte- 1059 AM MDT Thu Jul 20 2017 This Hazardous weather outlook is for portions of western South Dakota. .DAY ONE...Today and Tonight Isolated to scattered showers and thunderstorms will develop late this afternoon into this evening. Some of these storms will be strong to severe with large hail and damaging winds possible. Additionally...the combination of very warm temperatures and breezy winds will push the grassland fire danger into the very high category today. .DAYS TWO THROUGH SEVEN...Friday through Wednesday After a quiet weekend, an active weather pattern will return early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ032-042>044-046-047-049-211300- Haakon-Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp- 1059 AM MDT Thu Jul 20 2017 /1159 AM CDT Thu Jul 20 2017/ This Hazardous weather outlook is for portions of south central South Dakota...and western South Dakota. .DAY ONE...Today and Tonight Isolated to scattered showers and thunderstorms will move across the South Dakota plains this evening and overnight. A few storms will be strong to severe with large hail and damaging winds possible. .DAYS TWO THROUGH SEVEN...Friday through Wednesday After a quiet weekend, an active weather pattern will return early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:00 PM MDT | Heat Advisory | UNR | Haakon, Jackson, Mellette, Todd, Tripp | 29 hr |
| Jul 20, 5:22 PM MDT | Special Weather Statement | UNR | Harding | 23 min |
| Jul 20, 5:48 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding, Perkins | 72 min |
| Jul 20, 5:57 PM MDT | Special Weather Statement | UNR | Crook | 33 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.