Alert archive / Iowa / Red Flag Warnings in 2021
Red Flag Warning 7, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this red flag warning at May 1, 2021, 3:09 AM CDT for Dakota County, Dixon County, Nebraska; 10 counties in Iowa; Union County, South Dakota. It took effect at May 1, 2021, 1:00 PM CDT. It was in force for 6 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
- May 1, 2021, 3:09 AM CDT (08:09 UTC)
- In effect from
- May 1, 2021, 1:00 PM CDT
- Expired
- May 1, 2021, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS Sioux Falls, SD
Counties Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Dakota County, NE, Dixon County, NE, Union County, SD
The radar
The Sioux Falls radar (KFSD), 110 km from the middle of the area, began a volume at 08:12 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
Omaha, NE (KOAX), launched 00:00Z, 8.2 hours before the alert went out and 172 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
- 2917 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
396 WWUS83 KFSD 010809 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 309 AM CDT Sat May 1 2021 IAZ003-013-014-020>022-031-032-011800- /O.NEW.KFSD.FW.W.0007.210501T1800Z-210502T0000Z/ Dickinson-O'Brien-Clay-Plymouth-Cherokee-Buena Vista-Woodbury-Ida- 309 AM CDT Sat May 1 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 003, 013, 014, 020, 021, 022, 031, AND 032... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect from 1 PM this afternoon to 7 PM CDT this evening. * AFFECTED AREA...Fire weather zones 003, 013, 014, 020, 021, 022, 031, and 032. * WIND...Southwest 15 to 20 mph with gusts around 30 mph. * HUMIDITY...as low as 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. && $$
3 follow-up statements
472 WWUS83 KFSD 011507 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 1007 AM CDT Sat May 1 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING FOR PORTIONS OF FAR NORTHEAST NEBRASKA, FAR SOUTHEAST SOUTH DAKOTA, AND MUCH OF NORTHWEST IOWA... IAZ002-012-NEZ013-014-SDZ071-020000- /O.EXA.KFSD.FW.W.0007.210501T1800Z-210502T0000Z/ Osceola-Sioux-Dixon-Dakota-Union- 1007 AM CDT Sat May 1 2021 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 002, 012, 013, 014, AND 071... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect until 7 PM CDT this evening. * AFFECTED AREA...Fire weather zones 002, 012, 013, 014, and 071. * WIND...Southwest 15 to 20 mph with gusts around 30 mph. * HUMIDITY...as low as 20 percent. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ IAZ003-013-014-020>022-031-032-020000- /O.CON.KFSD.FW.W.0007.210501T1800Z-210502T0000Z/ Dickinson-O'Brien-Clay-Plymouth-Cherokee-Buena Vista-Woodbury-Ida- 1007 AM CDT Sat May 1 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 003, 013, 014, 020, 021, 022, 031, AND 032... * AFFECTED AREA...Fire weather zones 003, 013, 014, 020, 021, 022, 031, and 032. * WIND...Southwest 15 to 20 mph with gusts around 30 mph. * HUMIDITY...as low as 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. && $$
349 WWUS83 KFSD 011946 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 246 PM CDT Sat May 1 2021 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR PORTIONS OF FAR NORTHEAST NEBRASKA, FAR SOUTHEAST SOUTH DAKOTA, AND MUCH OF NORTHWEST IOWA... IAZ002-003-012>014-020>022-031-032-NEZ013-014-SDZ071-020000- /O.CON.KFSD.FW.W.0007.000000T0000Z-210502T0000Z/ Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Dixon-Dakota-Union- 246 PM CDT Sat May 1 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR GUSTY WINDS AND VERY LOW HUMIDITY FOR FIRE WEATHER ZONES 002, 003, 012, 013, 013, 014, 014, 020, 021, 022, 031, 032, AND 071... * AFFECTED AREA...Fire weather zones across portions of far southeast South Dakota, far northeast Nebraska, and much of northwest Iowa. * WIND...Southwest 15 to 20 mph with gusts up to 40 mph. * HUMIDITY...as low as 10 percent. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
200 WWUS83 KFSD 020009 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 709 PM CDT Sat May 1 2021 ...RED FLAG WARNING FOR LOW HUMIDITY AND STRONG WINDS FOR EXTREME SOUTHEAST SOUTH DAKOTA...EXTREME NORTHEAST NEBRASKA AND MUCH OF NORTHWEST IOWA ALLOWED TO EXPIRE... IAZ002-003-012>014-020>022-031-032-NEZ013-014-SDZ071-020115- /O.EXP.KFSD.FW.W.0007.000000T0000Z-210502T0000Z/ Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Dixon-Dakota-Union- 709 PM CDT Sat May 1 2021 ...RED FLAG WARNING HAS EXPIRED FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 002, 003, 012, 013, 013, 014, 014, 020, 021, 022, 031, 032, AND 071... Winds will continue to decrease early this evening, and relative humidity will also slowly recover as temperatures begin to fall. However, through shortly before sunset, there will still be some areas of southwest winds gusting 25 to 35 mph and humidity of 15 to 25 percent, creating continued very high to extreme fire danger. $$
Nearby
Red Flag Warnings in Iowa, 2021Red Flag Warnings in Nebraska, 2021Red 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.