Alert archive / Illinois / Red Flag Warnings in 2021
Red Flag Warning 1, NWS Chicago, IL
NWS Chicago, IL issued this red flag warning at Mar 29, 2021, 4:25 AM CDT for 4 counties in Illinois. It took effect at Mar 29, 2021, 1:00 PM CDT. It was in force for 7 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 29, 2021, 4:25 AM CDT (09:25 UTC)
- In effect from
- Mar 29, 2021, 1:00 PM CDT
- Expired
- Mar 29, 2021, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Chicago, IL
Counties Boone County, IL, Lee County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Chicago radar (KLOT), 105 km from the middle of the area, began a volume at 09:29 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
Davenport, (KDVN), launched 00:00Z, 9.4 hours before the alert went out and 124 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
- 1587 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
369 WWUS83 KLOT 290925 RFWLOT URGENT - FIRE WEATHER MESSAGE National Weather Service Chicago IL 425 AM CDT Mon Mar 29 2021 ...HIGH FIRE DANGER TODAY... ILZ003-004-008-010-291730- /O.NEW.KLOT.FW.W.0001.210329T1800Z-210330T0100Z/ Winnebago-Boone-Ogle-Lee- 425 AM CDT Mon Mar 29 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 8 PM CDT THIS EVENING FOR NORTH-CENTRAL ILLINOIS... The National Weather Service in Chicago has issued a Red Flag Warning, which is in effect from 1 PM this afternoon to 8 PM CDT this evening. * Affected Area...Winnebago, Boone, Ogle and Lee. * Winds...South around 20 to 30 mph with gusts up to 45 mph. * Timing...This afternoon and early evening * Relative Humidity...As low as 25 percent. * Impacts...The combination of strong winds, very low relative humidity, mild temperatures, and exceptionally dry fuels will likely promote extremely dangerous behavior of any fires. Any fires that develop outdoors will likely spread rapidly. Any planned outdoor burning should be postponed today. 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. && $$ Ogorek
3 follow-up statements
375 WWUS83 KLOT 291552 RFWLOT URGENT - FIRE WEATHER MESSAGE National Weather Service Chicago IL 1052 AM CDT Mon Mar 29 2021 ...HIGH FIRE DANGER TODAY... ILZ003-004-008-010-300000- /O.CON.KLOT.FW.W.0001.210329T1800Z-210330T0100Z/ Winnebago-Boone-Ogle-Lee- 1052 AM CDT Mon Mar 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR NORTH-CENTRAL ILLINOIS... * Affected Area...Winnebago, Boone, Ogle and Lee counties. * Winds...South around 20 to 30 mph with gusts up to 45 mph. * Timing...This afternoon and early evening * Relative Humidity...As low as 25 percent. * Impacts...The combination of strong winds, very low relative humidity, mild temperatures, and exceptionally dry fuels will likely promote extremely dangerous behavior of any fires. Any fires that develop outdoors will likely spread rapidly. Any planned outdoor burning should be postponed today. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
401 WWUS83 KLOT 292028 RFWLOT URGENT - FIRE WEATHER MESSAGE National Weather Service Chicago IL 328 PM CDT Mon Mar 29 2021 ...HIGH FIRE DANGER CONTINUES INTO EARLY EVENING... ILZ003-004-008-010-300100- /O.CON.KLOT.FW.W.0001.000000T0000Z-210330T0100Z/ Winnebago-Boone-Ogle-Lee- 328 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR NORTH-CENTRAL ILLINOIS... * Affected Area...Winnebago, Boone, Ogle and Lee. * Winds...South around 25 mph with gusts up to 45 mph. * Timing...Through early evening. * Relative Humidity...As low as 25 to 30 percent. * Impacts...The combination of strong winds, very low relative humidity, mild temperatures, and exceptionally dry fuels will likely promote extremely dangerous behavior of any fires. Any fires that develop outdoors will likely spread rapidly. Any planned outdoor burning should be postponed today and tonight. 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. && $$
206 WWUS83 KLOT 300105 RFWLOT URGENT - FIRE WEATHER MESSAGE National Weather Service Chicago IL 805 PM CDT Mon Mar 29 2021 ILZ003-004-008-010-300215- /O.EXP.KLOT.FW.W.0001.000000T0000Z-210330T0100Z/ Winnebago-Boone-Ogle-Lee- 805 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING HAS EXPIRED FOR NORTH CENTRAL ILLINOIS... Relative humidity levels will slowly rise tonight with the fire danger threat decreasing. It will remain windy into the overnight hours. $$
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 10:07 PM CDT | Gale Warning | LOT | 29 hr | |
| Mar 29, 2:56 AM CDT | Wind Advisory | LOT | Boone, Cook, DuPage, Lake, Lee, Ogle and 2 more | 22 hr |
| Mar 29, 3:06 AM CDT | Small Craft Advisory | LOT | 15 hr | |
| Mar 29, 2:52 PM CDT | Small Craft Advisory | LOT | 43 hr |
Nearby
Red Flag Warnings in Illinois, 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.