Alert archive / Missouri / Areal Flood Warnings in 2011

Areal Flood Warning 1, NWS St. Louis, MO

February 24, 20118 counties in Missouri; Randolph County, Illinois

NWS St. Louis, MO issued this areal flood warning at Feb 24, 2011, 7:36 PM CST for 8 counties in Missouri; Randolph County, Illinois. It was in force for 12 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
Feb 24, 2011, 7:36 PM CST (01:36 UTC)
Expired
Feb 25, 2011, 7:30 AM CST
In force
12 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Randolph County, IL, Crawford County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 86 km from the middle of the area, began a volume at 01:39 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

Little Rock, AR (KLZK), launched 00:00Z, 1.6 hours before the alert went out and 349 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, Little Rock, AR at 00:00Z on 2011-02-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 165 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 2011-02-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -230 square meters per square second.1939587897Sfc1 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
165 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
579 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
-230 m²/s²
0-3 km storm-relative helicity
-371 m²/s²
Significant tornado parameter
-0.2
Supercell composite
-0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this areal flood warning went out at Feb 24, 6:48 PM CST, 48 minutes earlier.

Area forecast discussion, Feb 24, 6:48 PM CST, 48 minutes before
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Hazardous weather outlook, Feb 24, 4:08 PM CST, 3 hours 28 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
408 PM CST THU FEB 24 2011

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-251200-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
408 PM CST THU FEB 24 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TONIGHT

A STRONG LATE WINTER STORM WILL BRING A VARIETY OF HAZARDOUS WEATHER
TO THE REGION TONIGHT. THUNDERSTORMS WILL BE POSSIBLE ACROSS MUCH
OF THE REGION...SOME STORMS MAY BE SEVERE ACROSS SOUTHEAST MISSOURI.
ADDITIONALLY...HEAVY RAIN AND LOCALIZED FLOODING MAY BE POSSIBLE
ACROSS SOUTHEAST MISSOURI.

COLD AIR WILL WRAP INTO THE STORM TONIGHT AND RAIN WILL CHANGE
BACK TO SNOW FROM NORTH TO SOUTH BEFORE ENDING. SNOWFALL AMOUNTS
IN EXCESS OF 6 INCHES IS LIKELY ACROSS NORTHERN MISSOURI AND WEST
CENTRAL ILLINOIS...WITH LESSER AMOUNTS FURTHER SOUTH. PLEASE SEE
THE WINTER STORM WARNING AND ADVISORIES FOR FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS ANOTHER CHANCE OF SNOW OVER NORTHEASTERN MISSOURI AND
WEST CENTRAL ILLINOIS FRIDAY NIGHT AND SATURDAY.

THUNDERSTORMS ARE POSSIBLE SUNDAY AND SUNDAY NIGHT AS ANOTHER
STORM SYSTEM MOVES THROUGH THE REGION.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE NECESSARY FOR SEVERE THUNDERSTORMS
ACROSS SOUTHEAST MISSOURI. SPOTTERS ACROSS THE AREA ARE ENCOURAGED
TO REPORT CHANGES IN PRECIPITATION TYPE AND SNOWFALL ACCUMULATIONS.

TILLY

In the hours before

Local storm report, Feb 24, 5:45 PM CST, 1 hour 51 minutes before
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Local storm report, Feb 24, 5:47 PM CST, 1 hour 49 minutes before
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Local storm report, Feb 24, 6:06 PM CST, 1 hour 30 minutes before
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Local storm report, Feb 24, 6:30 PM CST, 1 hour 6 minutes before
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Local storm report, Feb 24, 6:39 PM CST, 57 minutes before
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Local storm report, Feb 24, 6:40 PM CST, 56 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 24, 11:29 PM CSTRiver Flood WarningLSXOsage11 hr
Feb 25, 8:04 AM CSTRiver Flood WarningLSXCole25 hr

Nearby

Areal Flood Warnings in Missouri, 2011Areal Flood Warnings in Illinois, 2011Every areal flood 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.