Alert archive / Missouri / Red Flag Warnings in 2011

Red Flag Warning 1, NWS St. Louis, MO

March 23, 20114 counties in Missouri

NWS St. Louis, MO issued this red flag warning at Mar 23, 2011, 7:02 AM CDT for 4 counties in Missouri. It took effect at Mar 23, 2011, 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
Mar 23, 2011, 7:02 AM CDT (12:02 UTC)
In effect from
Mar 23, 2011, 1:00 PM CDT
Expired
Mar 23, 2011, 7:00 PM CDT
In force
6 hr
Issued by
NWS St. Louis, MO

Counties Dent County, MO, Iron County, MO, Madison County, MO, Reynolds County, MO

The radar

The St Louis radar (KLSX), 136 km from the middle of the area, began a volume at 12:02 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

Springfield, MO (KSGF), launched 12:00Z, 0.0 hours before the alert went out and 267 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, Springfield, MO at 12:00Z on 2011-03-23Temperature 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, Springfield, MO at 12:00Z on 2011-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939587897117136156Sfc1 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
1902 m above ground
0-6 km bulk shear
95 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
10 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.

336 
WWUS83 KLSX 231202
RFWLSX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
702 AM CDT WED MAR 23 2011

MOZ083>085-099-240000-
/O.NEW.KLSX.FW.W.0001.110323T1800Z-110324T0000Z/
DENT MO-IRON MO-MADISON MO-REYNOLDS MO-
702 AM CDT WED MAR 23 2011

...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. 

CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED THIS AFTERNOON DUE
TO THE COMBINATION OF RELATIVE HUMIDITY VALUES BETWEEN 20 AND 25
PERCENT...WESTERLY WINDS OF 15 TO 20 MPH WITH GUSTS UP TO 35
MPH...AND DRY VEGETATION AND FUELS. THESE CONDITIONS ARE CONDUCIVE
FOR THE RAPID SPREAD AND GROWTH OF 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 WARM TEMPERATURES WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

KANOFSKY
1 follow-up statement
301 
WWUS83 KLSX 240004
RFWLSX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
704 PM CDT WED MAR 23 2011


MOZ083>085-099-240115-
/O.EXP.KLSX.FW.W.0001.000000T0000Z-110324T0000Z/
DENT MO-IRON MO-MADISON MO-REYNOLDS MO-
704 PM CDT WED MAR 23 2011

...RED FLAG WARNING HAS EXPIRED...

THE RED FLAG WARNING IS NO LONGER IN EFFECT. 

FIRE WEATHER CONDITIONS HAVE IMPROVED HEADING INTO THE EVENING HOURS
AS RELATIVE HUMIDITIES HAVE RISEN ABOVE CRITICAL THRESHOLDS.
HOWEVER...WINDS WILL PERSIST FROM THE NORTHWEST AT 10 TO 20 MPH
WITH GUSTS TO 30 MPH AT TIMES...THEN SLOWLY DIMINISH BY LATE THIS
EVENING.

$$

BYRD

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 23, 12:45 PM CDTRiver Flood WarningLSXLewis52 days
Mar 23, 12:45 PM CDTRiver Flood WarningLSXMarion24 hr
Mar 23, 12:45 PM CDTRiver Flood WarningLSXMarion58 days
Mar 23, 12:45 PM CDTRiver Flood WarningLSXRalls53 days
Mar 23, 12:45 PM CDTRiver Flood WarningLSXPike58 days
Mar 23, 12:45 PM CDTRiver Flood WarningLSXPike60 days
Mar 23, 12:45 PM CDTRiver Flood WarningLSXLincoln57 days
Mar 23, 12:45 PM CDTRiver Flood WarningLSXSaint Charles114 days

Nearby

Red Flag Warnings in Missouri, 2011Every red flag warning in 2011

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.