Alert archive / Iowa / Red Flag Warnings in 2021
Red Flag Warning 3, NWS Des Moines, IA
NWS Des Moines, IA issued this red flag warning at Mar 28, 2021, 2:52 PM CDT for 42 counties in Iowa. It took effect at Mar 29, 2021, 12:00 PM CDT. It was in force for 8 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
- Mar 28, 2021, 2:52 PM CDT (19:52 UTC)
- In effect from
- Mar 29, 2021, 12:00 PM CDT
- Expired
- Mar 29, 2021, 8:00 PM CDT
- In force
- 8 hr
- Issued by
- NWS Des Moines, IA
All 42 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Humboldt County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 6 km from the middle of the area, began a volume at 19:53 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, 7.9 hours before the alert went out and 220 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
- 1259 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
319 WWUS83 KDMX 281952 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 252 PM CDT Sun Mar 28 2021 ...Extreme Fire Weather Conditions Monday Afternoon Across Much of Iowa... .The combination of warming temperatures, strong southerly winds and wind gusts, lowering humidities, and relatively dry prairie grasses and other fuels will create extreme fire weather conditions by Monday afternoon across large portions of Iowa. IAZ015-023>025-033>039-044>050-057>062-070>075-081>086-092>097- 290400- /O.UPG.KDMX.FW.A.0001.210329T1700Z-210330T0100Z/ /O.NEW.KDMX.FW.W.0003.210329T1700Z-210330T0100Z/ Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story- Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass- Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 252 PM CDT Sun Mar 28 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM CDT MONDAY 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 from noon to 8 PM CDT Monday. The Fire Weather Watch is no longer in effect. * IMPACTS...Any fires that start Monday afternoon may spread rapidly and become uncontrollable. * RELATIVE HUMIDITY...As low as 25 percent during the afternoon. * WIND...Strong south to southwest winds with sustained speeds to around 25 mph, and gusts to 45 mph possible. Wind gusts in excess of 50 mph may be possible for a brief period mid to late afternoon. * FUEL...Prairie grasses and any lingering crop debris will dry out quickly in these conditions and may be able to burn easily. 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. && $$ CURTIS
5 follow-up statements
010 WWUS83 KDMX 290159 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 859 PM CDT Sun Mar 28 2021 ...Extreme Fire Weather Conditions Monday Afternoon Across Much of Iowa... .The combination of warming temperatures, strong southerly wind, low relative humidity, and relatively dry prairie grasses and other fuels will create extreme fire weather conditions by Monday afternoon across large portions of Iowa. IAZ015-023>025-033>039-044>050-057>062-070>075-081>086-092>097- 291000- /O.CON.KDMX.FW.W.0003.210329T1700Z-210330T0100Z/ Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story- Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass- Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 859 PM CDT Sun Mar 28 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM CDT MONDAY FOR EXTREME FIRE CONDITIONS... * IMPACTS...Any fires that start Monday afternoon may spread rapidly and become uncontrollable. * Relative Humidity...Minimum relative humidity between 20 and 30 percent during the afternoon. * WIND...Strong south to southwest winds with sustained speeds of 25 to 35 mph, with gusts over 50 mph possible. * FUEL...Prairie grasses and any lingering crop debris will dry out quickly in these conditions and may be able to burn easily and lead to extremely fast fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
827 WWUS83 KDMX 290859 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 359 AM CDT Mon Mar 29 2021 ...Extreme Fire Weather Conditions This Afternoon Across Much of Iowa... .The combination of warm temperatures, strong southerly wind, low relative humidity, and relatively dry prairie grasses and other fuels will create extreme fire weather conditions by this afternoon across large portions of Iowa. IAZ015-023>025-033>039-044>050-057>062-070>075-081>086-092>097- 291700- /O.CON.KDMX.FW.W.0003.210329T1700Z-210330T0100Z/ Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story- Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass- Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 359 AM CDT Mon Mar 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS... * IMPACTS...Any fires that start this afternoon may spread rapidly and become uncontrollable. * RELATIVE HUMIDITY...As low as 28 percent. * WIND...Strong south to southwest winds with sustained speeds of 25 to 35 mph, with gusts over 50 mph possible. * FUEL...Prairie grasses and any lingering crop debris will dry out quickly in these conditions and may be able to burn easily and 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. && $$ Small
007 WWUS83 KDMX 291505 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 1005 AM CDT Mon Mar 29 2021 ...Extreme Fire Weather Conditions Through this Afternoon... .The combination of warm temperatures, strong southerly wind, low relative humidity, and relatively dry prairie grasses and other vegetation will lead to extreme fire weather conditions over much of Iowa today. IAZ015-023>025-033>039-044>050-057>062-070>075-081>086-092>097- 292315- /O.CON.KDMX.FW.W.0003.210329T1700Z-210330T0100Z/ Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story- Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass- Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 1005 AM CDT Mon Mar 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS... * IMPACTS...Any fires that start today may spread rapidly and become uncontrollable. * RELATIVE HUMIDITY...As low as 28 percent. * WIND...Strong south to southwest winds with sustained speeds of 25 to 35 mph, with gusts over 50 mph possible. * FUEL...Prairie grasses and any lingering crop debris will dry out quickly in these conditions and may be able to burn easily and lead to extremely fast fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ KLP
765 WWUS83 KDMX 292029 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 329 PM CDT Mon Mar 29 2021 ...Extreme Fire Weather Conditions Through this Evening... .The combination of warm temperatures, strong southerly wind, low relative humidity, and relatively dry prairie grasses and other vegetation will lead to extreme fire weather conditions over much of Iowa into the evening hours. IAZ015-023>025-033>039-044>050-057>062-070>075-081>086-092>097- 300100- /O.CON.KDMX.FW.W.0003.000000T0000Z-210330T0100Z/ Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story- Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass- Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 329 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS... * IMPACTS...Any fires that start today may spread rapidly and become uncontrollable. * RELATIVE HUMIDITY...As low as 25 percent. * WIND...Strong south to southwest winds with sustained speeds of 25 to 35 mph, with gusts over 50 mph possible. * FUEL...Prairie grasses and any lingering crop debris will dry out quickly in these conditions and may be able to burn easily and 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. && $$ KLP
878 WWUS83 KDMX 300055 RFWDMX URGENT - FIRE WEATHER MESSAGE National Weather Service Des Moines IA 755 PM CDT Mon Mar 29 2021 IAZ015-023>025-033>039-044>050-057>062-070>075-081>086-092>097- 300200- /O.EXP.KDMX.FW.W.0003.000000T0000Z-210330T0100Z/ Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story- Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass- Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 755 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM CDT THIS EVENING FOR EXTREME FIRE CONDITIONS.... The Red Flag Warning will expire at 8 pm. $$
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 4:22 AM CDT | Fire Weather Watch | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 36 more | 11 hr |
| Mar 28, 3:02 PM CDT | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 29 hr |
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.