Alert archive / Missouri / Red Flag Warnings in 2017
Red Flag Warning 5, NWS St. Louis, MO
NWS St. Louis, MO issued this red flag warning at Dec 11, 2017, 3:04 AM CST for 21 counties in Missouri; Monroe County, Randolph County, Saint Clair County, Illinois. It took effect at Dec 11, 2017, 10:00 AM CST. 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
- Dec 11, 2017, 3:04 AM CST (09:04 UTC)
- In effect from
- Dec 11, 2017, 10:00 AM CST
- Expired
- Dec 11, 2017, 6:00 PM CST
- In force
- 8 hr
- Issued by
- NWS St. Louis, MO
All 24 counties
Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 55 km from the middle of the area, began a volume at 09:06 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
Springfield, MO (KSGF), launched 00:00Z, 9.1 hours before the alert went out and 289 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
- 2290 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 208 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
835 WWUS83 KLSX 110904 RFWLSX URGENT - FIRE WEATHER MESSAGE National Weather Service Saint Louis MO 304 AM CST Mon Dec 11 2017 ILZ079-101-102-MOZ041-047>051-059>065-072>075-083>085-099-120000- /O.NEW.KLSX.FW.W.0001.171211T1600Z-171212T0000Z/ Boone MO-Callaway MO-Cole MO-Crawford MO-Dent MO-Franklin MO- Gasconade MO-Iron MO-Jefferson MO-Madison MO-Moniteau MO- Monroe IL-Montgomery MO-Osage MO-Randolph IL-Reynolds MO- Saint Charles MO-Saint Clair IL-Saint Francois MO- Saint Louis City MO-Saint Louis MO-Sainte Genevieve MO-Warren MO- Washington MO- 304 AM CST Mon Dec 11 2017 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 6 PM CST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL...EASTERN AND SOUTHEAST MISSOURI AS WELL AS SOUTHWEST AND SOUTHERN 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 10 AM this morning to 6 PM CST this evening. * AFFECTED AREA...In Illinois, Fire Weather Zones 079, 101 and 102. In Missouri, Fire Weather Zones 041, 047, 048, 049, 050, 051, 059, 060, 061, 062, 063, 064, 065, 072, 073, 074, 075, 083, 084, 085 and 099. * 20 FOOT WINDS...West 15 to 20 mph becoming northwest in the afternoon with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 15 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. && $$ Tilly
2 follow-up statements
509 WWUS83 KLSX 112127 RFWLSX URGENT - FIRE WEATHER MESSAGE National Weather Service Saint Louis MO 327 PM CST Mon Dec 11 2017 ILZ079-101-102-MOZ041-047>051-059>065-072>075-083>085-099-120000- /O.CON.KLSX.FW.W.0001.000000T0000Z-171212T0000Z/ Boone MO-Callaway MO-Cole MO-Crawford MO-Dent MO-Franklin MO- Gasconade MO-Iron MO-Jefferson MO-Madison MO-Moniteau MO- Monroe IL-Montgomery MO-Osage MO-Randolph IL-Reynolds MO- Saint Charles MO-Saint Clair IL-Saint Francois MO- Saint Louis City MO-Saint Louis MO-Sainte Genevieve MO-Warren MO- Washington MO- 327 PM CST Mon Dec 11 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS SOUTHWEST ILLINOIS... * AFFECTED AREA...In Illinois, Fire Weather Zones 079, 101 and 102. In Missouri, Fire Weather Zones 041, 047, 048, 049, 050, 051, 059, 060, 061, 062, 063, 064, 065, 072, 073, 074, 075, 083, 084, 085 and 099. * 20 FOOT WINDS...Northwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 18 percent. * 10 HOUR FUELS...Less than 9 percent. * IMPACTS...These conditions are conducive for the rapid spread and growth of uncontrolled wildfires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and dry fuels can contribute to extreme fire behavior. && $$ Britt
038 WWUS83 KLSX 120007 RFWLSX URGENT - FIRE WEATHER MESSAGE National Weather Service Saint Louis MO 607 PM CST Mon Dec 11 2017 ILZ079-101-102-MOZ041-047>051-059>065-072>075-083>085-099-120115- /O.EXP.KLSX.FW.W.0001.000000T0000Z-171212T0000Z/ Boone MO-Callaway MO-Cole MO-Crawford MO-Dent MO-Franklin MO- Gasconade MO-Iron MO-Jefferson MO-Madison MO-Moniteau MO- Monroe IL-Montgomery MO-Osage MO-Randolph IL-Reynolds MO- Saint Charles MO-Saint Clair IL-Saint Francois MO- Saint Louis City MO-Saint Louis MO-Sainte Genevieve MO-Warren MO- Washington MO- 607 PM CST Mon Dec 11 2017 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR FOR CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS SOUTHWEST ILLINOIS... The Reg Flag Warning has expired. Colder air was spreading across the area in the wake of an earlier cold front passage. The falling temperatures has resulted in increasing relative humidity levels to above values associated with critical fire weather conditions. Temperatures will continue to fall tonight with relative humidity increasing in tandem. Strong and gusty northwest winds will however continue this evening, with diminishing winds expected late tonight into early Tuesday morning. $$ Glass
Nearby
Red Flag Warnings in Missouri, 2017Red Flag Warnings in Illinois, 2017Every red flag warning in 2017
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.