Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 4, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this red flag warning at Mar 31, 2021, 2:41 PM CDT for 9 counties in South Dakota. It took effect at Apr 1, 2021, 10:00 AM CDT. It was in force for 12 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
- Mar 31, 2021, 2:41 PM CDT (19:41 UTC)
- In effect from
- Apr 1, 2021, 10:00 AM CDT
- Expired
- Apr 1, 2021, 10:00 PM CDT
- In force
- 12 hr
- Issued by
- NWS Sioux Falls, SD
Counties Aurora County, SD, Beadle County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Jerauld County, SD, Sanborn County, SD
The radar
The Sioux Falls radar (KFSD), 147 km from the middle of the area, began a volume at 19:39 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, 7.7 hours before the alert went out and 133 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
- 1046 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
428 WWUS83 KFSD 311941 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 241 PM CDT Wed Mar 31 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 10 PM CDT THURSDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR PORTIONS OF SOUTH CENTRAL...SOUTHEAST...AND EAST CENTRAL SOUTH DAKOTA... .Increasing south to southeast winds will gust up to 35 mph on Thursday across parts of South Dakota. Combined with warming temperatures and low afternoon humidity levels, conditions are expected to reach critical levels. SDZ038-050-052-053-057>059-063-064-010345- /O.NEW.KFSD.FW.W.0004.210401T1500Z-210402T0300Z/ Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix- Douglas- 241 PM CDT Wed Mar 31 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 10 PM CDT THURSDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 053, 057, 058, 059, 063, AND 064... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect from 10 AM to 10 PM CDT Thursday. * AFFECTED AREA...In South Dakota, the counties of Beadle, Gregory, Jerauld, Sanborn, Brule, Aurora, Davison, Charles Mix, and Douglas. * WIND...South to southeast 15 to 25 mph with gusts up to 35 mph in the afternoon. * HUMIDITY...Lowest humidity values 15 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. && $$
5 follow-up statements
312 WWUS83 KFSD 312008 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 308 PM CDT Wed Mar 31 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 10 PM CDT THURSDAY FOR GUSTY WINDS AND LOW HUMIDITY FOR PORTIONS OF SOUTH CENTRAL... SOUTHEAST...AND EAST CENTRAL SOUTH DAKOTA... .Increasing south to southeast winds will gust up to 35 mph on Thursday across parts of South Dakota. Combined with warming temperatures and low afternoon humidity levels, conditions are expected to reach critical levels. SDZ038-050-052-053-057>059-063-064-010415- /O.CON.KFSD.FW.W.0004.210401T1500Z-210402T0300Z/ Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix- Douglas- 308 PM CDT Wed Mar 31 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 10 PM CDT THURSDAY FOR FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 053, 057, 058, 059, 063, AND 064... * AFFECTED AREA...In South Dakota, the counties of Beadle, Gregory, Jerauld, Sanborn, Brule, Aurora, Davison, Charles Mix, and Douglas. * WIND...South to southeast 15 to 25 mph with gusts up to 35 mph in the afternoon. * HUMIDITY...Lowest humidity values 15 to 25 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
127 WWUS83 KFSD 010520 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 1220 AM CDT Thu Apr 1 2021 SDZ038-050-052-053-057>059-063-064-012100- /O.CON.KFSD.FW.W.0004.210401T1500Z-210402T0300Z/ Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix- Douglas- 1220 AM CDT Thu Apr 1 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 10 PM CDT THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 053, 057, 058, 059, 063, AND 064... * AFFECTED AREA...In South Dakota, the counties of Beadle, Gregory, Jerauld, Sanborn, Brule, Aurora, Davison, Charles Mix, and Douglas. * WIND...South to southeast 15 to 25 mph with gusts up to 35 mph in the afternoon. * HUMIDITY...Lowest humidity values 15 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. && $$
429 WWUS83 KFSD 010913 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 413 AM CDT Thu Apr 1 2021 SDZ038-050-052-053-057>059-063-064-012100- /O.CON.KFSD.FW.W.0004.210401T1500Z-210402T0300Z/ Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix- Douglas- 413 AM CDT Thu Apr 1 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 10 PM CDT THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 053, 057, 058, 059, 063, AND 064... * AFFECTED AREA...In South Dakota, the counties of Beadle, Gregory, Jerauld, Sanborn, Brule, Aurora, Davison, Charles Mix, and Douglas. * WIND...South to southeast 20 to 25 mph with gusts up to 40 mph in the afternoon. * HUMIDITY...Lowest humidity values 20 to 25 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
508 WWUS83 KFSD 011900 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 200 PM CDT Thu Apr 1 2021 SDZ038-050-052-053-057>059-063-064-020300- /O.CON.KFSD.FW.W.0004.000000T0000Z-210402T0300Z/ Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix- Douglas- 200 PM CDT Thu Apr 1 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 053, 057, 058, 059, 063, AND 064... * AFFECTED AREA...In South Dakota, the counties of Beadle, Gregory, Jerauld, Sanborn, Brule, Aurora, Davison, Charles Mix, and Douglas. * WIND...South to southeast 15 to 25 mph with gusts up to 35 mph in the afternoon. * HUMIDITY...Lowest humidity values 20 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. && $$
481 WWUS83 KFSD 020254 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 954 PM CDT Thu Apr 1 2021 SDZ038-050-052-053-057>059-063-064-020400- /O.EXP.KFSD.FW.W.0004.000000T0000Z-210402T0300Z/ Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix- Douglas- 954 PM CDT Thu Apr 1 2021 ...RED FLAG WARNING WILL EXPIRE AT 10 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 053, 057, 058, 059, 063, AND 064... The Red Flag Warning will expire at 10 PM CST. Although breezy southerly winds continue tonight, wind gusts and relative humidity values are no longer at critical levels. $$
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.