Alert archive / Iowa / Red Flag Warnings in 2021
Red Flag Warning 4, NWS Des Moines, IA
NWS Des Moines, IA issued this red flag warning at Apr 2, 2021, 10:50 AM CDT for 35 counties in Iowa. It took effect at Apr 2, 2021, 11:00 AM CDT. 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, 10:50 AM CDT (15:50 UTC)
- In effect from
- Apr 2, 2021, 11:00 AM CDT
- Expired
- Apr 2, 2021, 8:00 PM CDT
- In force
- 9 hr
- Issued by
- NWS Des Moines, IA
All 35 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Madison County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Ringgold County, IA, Sac County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 54 km from the middle of the area, began a volume at 15:54 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 202 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.
490 WWUS83 KDMX 021550 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 1050 AM CDT Fri Apr 2 2021 ...Elevated Fire Danger Today... .Strong south winds of 25 to 35 mph with higher gusts over 40 mph possible along with very low humidity values and dry or dead vegetation has led to the potential for elevated fire danger today. Burning is not recommended. IAZ004>007-015>017-023>026-033>037-044>048-057>060-070>073- 081>083-092>094-030000- /O.NEW.KDMX.FW.W.0004.210402T1600Z-210403T0100Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Sac-Calhoun-Webster-Hamilton- Hardin-Crawford-Carroll-Greene-Boone-Story-Audubon-Guthrie-Dallas- Polk-Cass-Adair-Madison-Warren-Adams-Union-Clarke-Taylor-Ringgold- Decatur- 1050 AM CDT Fri Apr 2 2021 ...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS.... The National Weather Service in Des Moines has issued a Red Flag Warning FOR EXTREME FIRE CONDITIONS, which is in effect until 8 PM CDT this evening. * Relative Humidity...As low as 21 percent. * Impacts...Any fires that develop today may spread rapidly and become uncontrollable. * WIND...Strong south winds with sustained speeds of 25 to 35 mph, with gusts as high as 45 mph possible. The strongest wind gusts are likely to occur in western portions of Iowa. * FUEL...Prairie grasses and other vegetation remains dry or dead and will easily ignite. Plus, any lingering crop debris could quickly burn in these conditions. The combination of all the aforementioned aspects will lead to extremely fast fire growth. 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. && $$ Podrazik/Martin
2 follow-up statements
971 WWUS83 KDMX 022023 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 323 PM CDT Fri Apr 2 2021 ...Elevated Fire Danger Through This Evening... .The very strong south winds of 25 to 35 mph with higher gusts over 40 mph look to persist through the evening hours. In addition to the intense winds, humidity values remain low and the vegetation continues to be susceptible to burning leading to the potential for elevated fire danger today. Burning is not recommended. IAZ004>007-015>017-023>026-033>037-044>048-057>060-070>073- 081>083-092>094-030100- /O.CON.KDMX.FW.W.0004.000000T0000Z-210403T0100Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Sac-Calhoun-Webster-Hamilton- Hardin-Crawford-Carroll-Greene-Boone-Story-Audubon-Guthrie-Dallas- Polk-Cass-Adair-Madison-Warren-Adams-Union-Clarke-Taylor-Ringgold- Decatur- 323 PM CDT Fri Apr 2 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS.... * Relative Humidity...As low as 21 percent. * Impacts...Any fires that develop today may spread rapidly and become uncontrollable. * WIND...Strong south winds with sustained speeds of 25 to 35 mph, with gusts as high as 45 mph possible. The strongest wind gusts are likely to occur in western portions of Iowa. * FUEL...Prairie grasses and other vegetation remains dry or dead and will easily ignite. Plus, any lingering crop debris could quickly burn in these conditions. The combination of all the aforementioned aspects will lead to extremely fast fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ KLP
413 WWUS83 KDMX 030056 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 756 PM CDT Fri Apr 2 2021 IAZ004>007-015>017-023>026-033>037-044>048-057>060-070>073- 081>083-092>094-030200- /O.EXP.KDMX.FW.W.0004.000000T0000Z-210403T0100Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Sac-Calhoun-Webster-Hamilton- Hardin-Crawford-Carroll-Greene-Boone-Story-Audubon-Guthrie-Dallas- Polk-Cass-Adair-Madison-Warren-Adams-Union-Clarke-Taylor-Ringgold- Decatur- 756 PM CDT Fri Apr 2 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS.... Strong winds, warm temperatures, and dry conditions that combined to produce Red Flag Warning criteria have eased. Therefore the red flag warning will be allowed to expire at 8 PM. $$ Zogg
Nearby
Red Flag Warnings in Iowa, 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.