Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 8, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this red flag warning at Nov 23, 2021, 3:46 AM CST for 10 counties in South Dakota. It took effect at Nov 23, 2021, 11:00 AM CST. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 23, 2021, 3:46 AM CST (09:46 UTC)
- In effect from
- Nov 23, 2021, 11:00 AM CST
- Expired
- Nov 23, 2021, 6:00 PM CST
- In force
- 7 hr
- Issued by
- NWS Sioux Falls, SD
Counties Aurora County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 127 km from the middle of the area, began a volume at 09:48 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 00:00Z, 9.8 hours before the alert went out and 168 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1707 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
265 WWUS83 KFSD 230946 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 346 AM CST Tue Nov 23 2021 SDZ050-057>060-063>065-068-069-231800- /O.UPG.KFSD.FW.A.0002.211123T1700Z-211124T0000Z/ /O.NEW.KFSD.FW.W.0008.211123T1700Z-211124T0000Z/ Gregory-Brule-Aurora-Davison-Hanson-Charles Mix-Douglas- Hutchinson-Bon Homme-Yankton- 346 AM CST Tue Nov 23 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 6 PM CST THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 050, 057, 058, 059, 060, 063, 064, 065, 068, AND 069... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect from 11 AM this morning to 6 PM CST this evening. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire weather zones across portions of south central and southeast South Dakota. * WIND...Southwest at 15 to 25 mph with gusts up to 30 mph. * HUMIDITY...As low as 18 to 25 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
2 follow-up statements
494 WWUS83 KFSD 231637 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 1037 AM CST Tue Nov 23 2021 SDZ050-057>060-063>065-068-069-240000- /O.CON.KFSD.FW.W.0008.211123T1700Z-211124T0000Z/ Gregory-Brule-Aurora-Davison-Hanson-Charles Mix-Douglas- Hutchinson-Bon Homme-Yankton- 1037 AM CST Tue Nov 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 050, 057, 058, 059, 060, 063, 064, 065, 068, AND 069... * AFFECTED AREA...Fire weather zones across portions of south central and southeast South Dakota. * WIND...Southwest at 15 to 25 mph with gusts up to 30 mph. * HUMIDITY...As low as 18 to 25 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
689 WWUS83 KFSD 240023 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 623 PM CST Tue Nov 23 2021 ...RED FLAG WARNING FOR LOW HUMIDITY AND STRONG WINDS FOR PORTIONS OF SOUTH CENTRAL AND SOUTHEAST SOUTH DAKOTA ALLOWED TO EXPIRE... SDZ050-057>060-063>065-068-069-240130- /O.EXP.KFSD.FW.W.0008.000000T0000Z-211124T0000Z/ Gregory-Brule-Aurora-Davison-Hanson-Charles Mix-Douglas- Hutchinson-Bon Homme-Yankton- 623 PM CST Tue Nov 23 2021 ...RED FLAG WARNING HAS EXPIRED FOR LOW HUMIDITY AND STRONG WINDS FOR FIRE WEATHER ZONES 050, 057, 058, 059, 060, 063, 064, 065, 068, AND 069... Winds will continue to decrease early this evening, and relative humidity will also slowly recover as temperatures begin to fall. However, for the next hour or two, there will still be some southerly winds gusting 25 to 30 mph and humidity of 20 to 25 percent, creating continued very high to extreme fire danger. $$
Nearby
Red Flag Warnings in South Dakota, 2021Every red flag warning 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.