Alert archive / Missouri / Red Flag Warnings in 2021
Red Flag Warning 1, NWS St. Louis, MO
NWS St. Louis, MO issued this red flag warning at Mar 29, 2021, 3:00 AM CDT for 12 counties in Missouri; Adams County, Brown County, Illinois. 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 29, 2021, 3:00 AM CDT (08:00 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 St. Louis, MO
Counties Adams County, IL, Brown County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Osage County, MO, Ralls County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 126 km from the middle of the area, began a volume at 08:02 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, 8.0 hours before the alert went out and 273 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.
177 WWUS83 KLSX 290800 RFWLSX URGENT - FIRE WEATHER MESSAGE National Weather Service Saint Louis MO 300 AM CDT Mon Mar 29 2021 ILZ095-096-MOZ018-019-026-027-034-035-041-042-047-048-050-292000- /O.NEW.KLSX.FW.W.0001.210329T1700Z-210330T0100Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Callaway MO-Cole MO-Knox MO- Lewis MO-Marion MO-Moniteau MO-Monroe MO-Ralls MO-Shelby MO- 300 AM CDT Mon Mar 29 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF NORTHEAST AND CENTRAL MISSOURI AND A PORTION OF WEST-CENTRAL ILLINOIS... The National Weather Service in Saint Louis has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon today to 8 PM CDT this evening. * AFFECTED AREA...In Illinois, Fire Weather Zones 095 and 096. In Missouri, Fire Weather Zones 018, 019, 026, 027, 034, 035, 041, 042, 047, 048 and 050. * 20 FOOT WINDS...South 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 20 percent. * 10 HOUR FUELS...Less than 9 percent. * IMPACTS...These conditions are conducive for the rapid spread and growth of uncontrolled wildfires. 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 dry fuels can contribute to extreme fire behavior. && $$ TES
2 follow-up statements
065 WWUS83 KLSX 291726 RFWLSX URGENT - FIRE WEATHER MESSAGE National Weather Service Saint Louis MO 1226 PM CDT Mon Mar 29 2021 MOZ049-300100- /O.EXA.KLSX.FW.W.0001.000000T0000Z-210330T0100Z/ Osage MO- 1226 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL MISSOURI... The National Weather Service in Saint Louis has issued a Red Flag Warning for wind and low relative humidity, which is in effect until 8 PM CDT this evening. * AFFECTED AREA...In Missouri, Fire Weather Zone 049. * 20 FOOT WINDS...South 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 23 percent. * 10 HOUR FUELS...Less than 9 percent. * IMPACTS...These conditions are conducive for the rapid spread and growth of uncontrolled wildfires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and dry fuels can contribute to extreme fire behavior. && $$ ILZ095-096-MOZ018-019-026-027-034-035-041-042-047-048-050-300100- /O.CON.KLSX.FW.W.0001.000000T0000Z-210330T0100Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Callaway MO-Cole MO-Knox MO- Lewis MO-Marion MO-Moniteau MO-Monroe MO-Ralls MO-Shelby MO- 1226 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL MISSOURI AND WESTERN ILLINOIS... * AFFECTED AREA...In Illinois, Fire Weather Zones 095 and 096. In Missouri, Fire Weather Zones 018, 019, 026, 027, 034, 035, 041, 042, 047, 048 and 050. * 20 FOOT WINDS...South 15 to 25 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 23 percent. * 10 HOUR FUELS...Less than 9 percent. * IMPACTS...These conditions are conducive for the rapid spread and growth of uncontrolled wildfires. 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 dry fuels can contribute to extreme fire behavior. && $$ Elmore
096 WWUS83 KLSX 300104 RFWLSX URGENT - FIRE WEATHER MESSAGE National Weather Service Saint Louis MO 804 PM CDT Mon Mar 29 2021 ILZ095-096-MOZ018-019-026-027-034-035-041-042-047>050-300215- /O.EXP.KLSX.FW.W.0001.000000T0000Z-210330T0100Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Callaway MO-Cole MO-Knox MO- Lewis MO-Marion MO-Moniteau MO-Monroe MO-Osage MO-Ralls MO- Shelby MO- 804 PM CDT Mon Mar 29 2021 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST AND CENTRAL MISSOURI AND A PORTION OF WEST-CENTRAL ILLINOIS... Relative humidity has risen above 25 percent across the area, reducing danger of uncontrollable wild fires. Therefore, the Red Flag Warning has been allowed to expire. $$ Pfahler
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 3:00 AM CDT | Wind Advisory | LSX | Knox, Lewis, Marion, Shelby | 17 hr |
Nearby
Red Flag Warnings in Missouri, 2021Red 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.