Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 6, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this red flag warning at Apr 3, 2021, 4:09 AM CDT for 5 counties in South Dakota. It took effect at Apr 3, 2021, 2:00 PM CDT. 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
- Apr 3, 2021, 4:09 AM CDT (09:09 UTC)
- In effect from
- Apr 3, 2021, 2:00 PM CDT
- Expired
- Apr 3, 2021, 9:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Sioux Falls, SD
Counties Aurora County, SD, Beadle County, SD, Brule County, SD, Gregory County, SD, Jerauld County, SD
The radar
The Sioux Falls radar (KFSD), 164 km from the middle of the area, began a volume at 09:09 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, 9.2 hours before the alert went out and 123 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
- 3292 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -125 m²/s²
- 0-3 km storm-relative helicity
- -75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
680 WWUS83 KFSD 030909 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 409 AM CDT Sat Apr 3 2021 SDZ038-050-052-057-058-031715- /O.NEW.KFSD.FW.W.0006.210403T1900Z-210404T0200Z/ Beadle-Gregory-Jerauld-Brule-Aurora- 409 AM CDT Sat Apr 3 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 9 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR SOUTH DAKOTA FIRE WEATHER ZONES 038, 050, 052, 057, 058... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect from 2 PM this afternoon to 9 PM CDT this evening. * AFFECTED AREA...In South Dakota...Fire weather zones 038, 050, 052, 057, and 058, or generally west of a line from Huron to Lake Andes. * WIND...South 15 to 20 mph with gusts 25 to 30 mph. * HUMIDITY...as low as 15 to 20 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. && $$
3 follow-up statements
345 WWUS83 KFSD 031517 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 1017 AM CDT Sat Apr 3 2021 SDZ038-050-052-057-058-032330- /O.CON.KFSD.FW.W.0006.210403T1900Z-210404T0200Z/ Beadle-Gregory-Jerauld-Brule-Aurora- 1017 AM CDT Sat Apr 3 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 9 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 057, AND 058... * AFFECTED AREA...In South Dakota...Fire weather zones 038, 050, 052, 057, and 058, or generally west of a line from Huron to Lake Andes. * WIND...South increasing this afternoon to 15 to 20 mph with gusts around 25 mph. * HUMIDITY...as low as 15 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
784 WWUS83 KFSD 032138 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 438 PM CDT Sat Apr 3 2021 SDZ038-050-052-057-058-040200- /O.CON.KFSD.FW.W.0006.000000T0000Z-210404T0200Z/ Beadle-Gregory-Jerauld-Brule-Aurora- 438 PM CDT Sat Apr 3 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 057, AND 058... * AFFECTED AREA...In South Dakota...Fire weather zones 038, 050, 052, 057, and 058, or generally west of a line from Huron to Lake Andes. * WIND...South increasing into early evening 14 to 20 mph, with frequent gusts around around 25 mph. * HUMIDITY...as low as 12 to 15 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. && $$
517 WWUS83 KFSD 040203 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 903 PM CDT Sat Apr 3 2021 SDZ038-050-052-057-058-040315- /O.EXP.KFSD.FW.W.0006.000000T0000Z-210404T0200Z/ Beadle-Gregory-Jerauld-Brule-Aurora- 903 PM CDT Sat Apr 3 2021 ...RED FLAG WARNING HAS EXPIRED FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 038, 050, 052, 057, AND 058... As of 900 pm CDT, decreasing wind speed and a small increase in humidity has ended the critical fire weather threat for the night. However, with humidity remaining from 20 to 30 percent at mid evening, one should continue to exercise caution with any use of fire. $$
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.