Alert archive / Iowa / Red Flag Warnings in 2020
Red Flag Warning 3, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this red flag warning at Sep 29, 2020, 10:47 AM CDT for 7 counties in Iowa. It took effect at Sep 29, 2020, 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
- Sep 29, 2020, 10:47 AM CDT (15:47 UTC)
- In effect from
- Sep 29, 2020, 1:00 PM CDT
- Expired
- Sep 29, 2020, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS Sioux Falls, SD
Counties Cherokee County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA
The radar
The Sioux Falls radar (KFSD), 107 km from the middle of the area, began a volume at 15:47 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 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
- 1493 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
196 WWUS83 KFSD 291547 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 1047 AM CDT Tue Sep 29 2020 ...RED FLAG WARNING IS IN EFFECT FROM 1PM to 7PM THIS EVENING FOR PORTIONS OF SOUTHEAST SOUTH DAKOTA AND FAR WESTERN IOWA... IAZ012-020-031-NEZ249-SDZ258-300000- /O.NEW.KFSD.FW.W.0003.200929T1800Z-200930T0000Z/ Sioux-Plymouth-Woodbury-Extreme Northeast Nebraska- Lower James River To Lower Big Sioux River Valley- 1047 AM CDT Tue Sep 29 2020 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 012, 020, 031, 249, AND 258... 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 012, 020, and 031. Fire weather zone 249. Fire weather zone 258. * WIND...Westerly winds will increase between 20 and 25 mph by early afternoon gusting to 35 mph at times. Winds will begin to turn northwesterly by mid-afternoon with strong gusts continuing. * HUMIDITY...Lowest afternoon relative humidity values will be between 22 and 27 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. && $$
2 follow-up statements
962 WWUS83 KFSD 291912 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 212 PM CDT Tue Sep 29 2020 ...RED FLAG WARNING IS IN EFFECT FROM 1PM to 7PM THIS EVENING FOR PORTIONS OF SOUTHEAST SOUTH DAKOTA NORTHEAST NEBRASKA AND NORTHWESTERN IOWA... IAZ001-013-021-032-300000- /O.EXA.KFSD.FW.W.0003.000000T0000Z-200930T0000Z/ Lyon-O'Brien-Cherokee-Ida- 212 PM CDT Tue Sep 29 2020 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 012, 020, 031, 249, AND 258... The National Weather Service in Sioux Falls has issued a Red Flag Warning, which is in effect until 7 PM CDT this evening. * AFFECTED AREA...Fire weather zones 012, 020, and 031. Fire weather zone 249. Fire weather zone 258. * WIND...Westerly winds will increase between 20 and 25 mph by early afternoon gusting to 35 mph at times. Winds will begin to turn northwesterly by mid-afternoon with strong gusts continuing. * HUMIDITY...Lowest afternoon relative humidity values will be between 22 and 27 percent. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ IAZ012-020-031-NEZ249-SDZ258-300000- /O.CON.KFSD.FW.W.0003.000000T0000Z-200930T0000Z/ Sioux-Plymouth-Woodbury-Extreme Northeast Nebraska- Lower James River To Lower Big Sioux River Valley- 212 PM CDT Tue Sep 29 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR STRONG WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 012, 020, 031, 249, AND 258... * AFFECTED AREA...Fire weather zones 012, 020, and 031. Fire weather zone 249. Fire weather zone 258. * WIND...Westerly winds will increase between 20 and 25 mph by early afternoon gusting to 35 mph at times. Winds will begin to turn northwesterly by mid-afternoon with strong gusts continuing. * HUMIDITY...Lowest afternoon relative humidity values will be between 22 and 27 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. && $$
710 WWUS83 KFSD 292353 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 653 PM CDT Tue Sep 29 2020 IAZ001-012-013-020-021-031-032-NEZ249-SDZ258-300100- /O.EXP.KFSD.FW.W.0003.000000T0000Z-200930T0000Z/ Lyon-Sioux-O'Brien-Plymouth-Cherokee-Woodbury-Ida- Extreme Northeast Nebraska- Lower James River To Lower Big Sioux River Valley- 653 PM CDT Tue Sep 29 2020 ...RED FLAG WARNING WILL EXPIRE AT 7 PM CDT THIS EVENING FOR HIGH WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 001, 012, 013, 020, 021, 031, 032, 249, AND 258... Relative humidities across the region have improved from their mid-afternoon low points, and winds are beginning to taper off as mixing decreases. $$
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 29, 2:36 PM CDT | Wind Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 29 hr |
Nearby
Red Flag Warnings in Iowa, 2020Red Flag Warnings in Nebraska, 2020Red Flag Warnings in South Dakota, 2020Every red flag warning in 2020
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.