Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 5, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this red flag warning at Apr 2, 2021, 10:49 AM CDT for 4 states. It was in force for 9 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 2, 2021, 10:49 AM CDT (15:49 UTC)
- Expired
- Apr 2, 2021, 8:00 PM CDT
- In force
- 9 hr
- Issued by
- NWS Sioux Falls, SD
All 33 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Dakota County, NE, Dixon County, NE, Bon Homme County, SD, Brookings County, SD, Clay County, SD, Hutchinson County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 44 km from the middle of the area, began a volume at 15:53 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 12:00Z, 3.8 hours before the alert went out and 226 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
- 2259 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 840 m²/s²
- 0-3 km storm-relative helicity
- 1056 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
244 WWUS83 KFSD 021549 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 1049 AM CDT Fri Apr 2 2021 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ040-055-056-061-062-065>071-030000- /O.NEW.KFSD.FW.W.0005.210402T1549Z-210403T0100Z/ Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Brookings-Lake-Moody-McCook-Minnehaha- Hutchinson-Turner-Bon Homme-Yankton-Union- 1049 AM CDT Fri Apr 2 2021 ...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR STRONG WINDS AND LOW RELATIVE HUMIDITIES FOR FIRE WEATHER ZONES 001, 002, 003, 012, 013, 013, 014, 014, 020, 021, 022, 031, 032, 040, 055, 056, 061, 062, 065, 066, 067, 068, 069, 070, 071, 071, 072, 080, 081, 089, 090, 097, AND 098... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect until 8 PM CDT this evening. * AFFECTED AREA...Southwest Minnesota, northwest Iowa, northeast Nebraska and far eastern South Dakota. * WIND...South 20 to 30 mph with gusts of 40 to 45 mph. * HUMIDITY...lowest humidity 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. && $$
2 follow-up statements
086 WWUS83 KFSD 022137 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 437 PM CDT Fri Apr 2 2021 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ040-055-056-061-062-065>071-030100- /O.CON.KFSD.FW.W.0005.000000T0000Z-210403T0100Z/ Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Brookings-Lake-Moody-McCook-Minnehaha- Hutchinson-Turner-Bon Homme-Yankton-Union- 437 PM CDT Fri Apr 2 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR STRONG WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 001, 002, 003, 012, 013, 013, 014, 014, 020, 021, 022, 031, 032, 040, 055, 056, 061, 062, 065, 066, 067, 068, 069, 070, 071, 071, 072, 080, 081, 089, 090, 097, AND 098... * AFFECTED AREA...Southwest Minnesota, northwest Iowa, northeast Nebraska and far eastern South Dakota. * WIND...South 20 to 30 mph with gusts of 40 to 45 mph. * HUMIDITY...lowest humidity 15 to 22 percent. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
731 WWUS83 KFSD 030112 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 812 PM CDT Fri Apr 2 2021 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ040-055-056-061-062-065>071-030215- /O.EXP.KFSD.FW.W.0005.000000T0000Z-210403T0100Z/ Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Brookings-Lake-Moody-McCook-Minnehaha- Hutchinson-Turner-Bon Homme-Yankton-Union- 812 PM CDT Fri Apr 2 2021 ...RED FLAG WARNING HAS EXPIRED FOR STRONG WIND AND LOW HUMIDITY FOR FIRE WEATHER ZONES 001, 002, 003, 012, 013, 013, 014, 014, 020, 021, 022, 031, 032, 040, 055, 056, 061, 062, 065, 066, 067, 068, 069, 070, 071, 071, 072, 080, 081, 089, 090, 097, AND 098... Strong winds have diminished to under 20 mph as of 8 pm CDT, with a slight recovery in humidity to around 25 to 35 percent. Continue to use caution in dealing with fire, as even with lesser wind, the low humidity values will lead to erratic fire behavior. $$
Nearby
Red Flag Warnings in South Dakota, 2021Red Flag Warnings in Iowa, 2021Red Flag Warnings in Minnesota, 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.