Alert archive / Illinois / Red Flag Warnings in 2007

Red Flag Warning 1, NWS St. Louis, MO

October 21, 200714 counties in Illinois; 8 counties in Missouri

NWS St. Louis, MO issued this red flag warning at Oct 21, 2007, 5:25 AM CDT for 14 counties in Illinois; 8 counties in Missouri. It took effect at Oct 21, 2007, 1:00 PM CDT. It was in force for 6 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
Oct 21, 2007, 5:25 AM CDT (10:25 UTC)
In effect from
Oct 21, 2007, 1:00 PM CDT
Expired
Oct 21, 2007, 7:00 PM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
All 22 counties

Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 46 km from the middle of the area, began a volume at 10:26 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

Lincoln, IL (KILX), launched 00:00Z, 10.4 hours before the alert went out and 206 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2007-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2007-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 346 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2574 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
346 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS83 KLSX 211025
RFWLSX

RED FLAG WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
525 AM CDT SUN OCT 21 2007

ILZ058>060-064-065-069-070-074-079-098>102-MOZ052-059>065-212100-
/O.NEW.KLSX.FW.W.0001.071021T1800Z-071022T0000Z/
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-CALHOUN IL-JERSEY IL-
MADISON IL-ST. CLAIR IL-MONROE IL-LINCOLN-GASCONADE-WARREN-
ST. CHARLES-FRANKLIN-ST. LOUIS-ST. LOUIS CITY-JEFFERSON-
525 AM CDT SUN OCT 21 2007

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM
CDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT
THIS EVENING. 

THE COMBINATION OF UNSEASONABLY WARM TEMPERATURES IN THE 80S...
VERY LOW AFTERNOON RELATIVE HUMIDITIES BELOW 25 PERCENT...VERY DRY 
FUELS...AND STRONG SOUTHERLY WINDS OF 15 TO 25 MPH WITH GUSTS TO
35 TO 40 MPH WILL CREATE DANGEROUS FIRE WEATHER CONDITIONS THIS
AFTERNOON AND EARLY THIS EVENING. IN ADDITION...THESE CONDITIONS
ARE OCCURRING OVER AREAS THAT HAVE EXPERIENCED DROUGHT FOR MUCH
OF THE SUMMER AND EARLY AUTUMN AND CONTINUE TO HAVE RAINFALL
DEFICITS FOR THE YEAR.

CONDITIONS ARE EXPECTED TO RAPIDLY IMPROVE THIS EVENING AS 
RELATIVE HUMIDITIES RISE AND WINDS DIMINISH. 

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 WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

$$

TES
1 follow-up statement
000 
WWUS83 KLSX 220017
RFWLSX

RED FLAG WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
717 PM CDT SUN OCT 21 2007


ILZ058>060-064-065-069-070-074-079-098>102-MOZ052-059>065-220130-
/O.EXP.KLSX.FW.W.0001.000000T0000Z-071022T0000Z/
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-CALHOUN IL-JERSEY IL-
MADISON IL-ST. CLAIR IL-MONROE IL-LINCOLN-GASCONADE-WARREN-
ST. CHARLES-FRANKLIN-ST. LOUIS-ST. LOUIS CITY-JEFFERSON-
717 PM CDT SUN OCT 21 2007

...RED FLAG WARNING HAS EXPIRED...

THE RED FLAG WARNING IS NO LONGER IN EFFECT. WINDS WILL CONTINUE
TO SLOWLY DECREASE AND THE RELATIVE HUMIDITY WILL RISE THROUGH
THE EVENING HOURS DIMINISHING THE RISK OF WILDFIRES.

$$

BRITT

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 21, 7:49 AM CDTWind AdvisoryLSXAdams, Bond, Brown, Calhoun, Clinton, Fayette and 10 more5 hr

Nearby

Red Flag Warnings in Illinois, 2007Red Flag Warnings in Missouri, 2007Every red flag warning in 2007

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.