Alert archive / South Dakota / Wind Advisories in 2021
Wind Advisory 13, NWS Rapid City, SD
NWS Rapid City, SD issued this wind advisory at Aug 8, 2021, 9:07 PM MDT for 5 counties in South Dakota. It took effect at Aug 9, 2021, 12:00 AM MDT. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 8, 2021, 9:07 PM MDT (03:07 UTC)
- In effect from
- Aug 9, 2021, 12:00 AM MDT
- Expired
- Aug 9, 2021, 3:02 AM MDT
- In force
- 3 hr
- Issued by
- NWS Rapid City, SD
Counties Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD
The radar
The Rapid City radar (KUDX), 71 km from the middle of the area, began a volume at 03:06 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
Rapid City, SD (KUNR), launched 00:00Z, 3.1 hours before the alert went out and 75 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
- 289 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 3316 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
471 WWUS73 KUNR 090307 NPWUNR URGENT - WEATHER MESSAGE National Weather Service Rapid City SD 907 PM MDT Sun Aug 8 2021 SDZ001-012-025-026-031-072-073-091200- /O.NEW.KUNR.WI.Y.0013.210809T0600Z-210809T1200Z/ Harding-Butte-Northern Foot Hills-Rapid City-Pennington Co Plains- Sturgis/Piedmont Foot Hills-Southern Meade Co Plains- Including the cities of Buffalo, Belle Fourche, Spearfish, Whitewood, Rapid City, Box Elder, Caputa, Wall, Sturgis, Piedmont, Summerset, Ellsworth AFB, and Union Center 907 PM MDT Sun Aug 8 2021 ...WIND ADVISORY IN EFFECT UNTIL 6 AM MDT MONDAY... * WHAT...West to northwest winds 20 to 35 mph with gusts up to 50 mph expected. * WHERE...Portions of northwestern and southwestern South Dakota. * WHEN...Until 6 AM MDT Monday. * IMPACTS...Sudden wind gusts can cause drivers to lose control, especially in lightweight or high profile vehicles. Strong winds can cause blowing dust, reduced visibility, and flying debris. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$
1 follow-up statement
267 WWUS73 KUNR 090902 NPWUNR URGENT - WEATHER MESSAGE National Weather Service Rapid City SD 302 AM MDT Mon Aug 9 2021 SDZ001-012-025-026-031-072-073-091015- /O.CAN.KUNR.WI.Y.0013.000000T0000Z-210809T1200Z/ Harding-Butte-Northern Foot Hills-Rapid City-Pennington Co Plains- Sturgis/Piedmont Foot Hills-Southern Meade Co Plains- Including the cities of Buffalo, Belle Fourche, Spearfish, Whitewood, Rapid City, Box Elder, Caputa, Wall, Sturgis, Piedmont, Summerset, Ellsworth AFB, and Union Center 302 AM MDT Mon Aug 9 2021 ...WIND ADVISORY IS CANCELLED... Winds have decreased across the area behind the front. $$
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 9:35 PM MDT | Special Weather Statement | UNR | 40 min | |
| Aug 9, 3:36 AM MDT | Fire Weather Watch | UNR | Butte, Haakon, Jackson, Lawrence, Meade, Pennington and 2 more | 24 hr |
Nearby
Wind Advisories in South Dakota, 2021Every wind advisory in 2021
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.