Alert archive / Missouri / Areal Flood Warnings in 2009

Areal Flood Warning 69, NWS St. Louis, MO

October 8, 200915 counties in Missouri; 8 counties in Illinois

NWS St. Louis, MO issued this areal flood warning at Oct 8, 2009, 6:04 PM CDT for 15 counties in Missouri; 8 counties in Illinois. It was in force for 18 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 8, 2009, 6:04 PM CDT (23:04 UTC)
Expired: Oct 9, 2009, 12:00 PM CDT
In force: 18 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

All 23 counties

Bond County, IL, Calhoun County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Montgomery County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Franklin County, MO, Gasconade County, MO, Lincoln County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 28 km from the middle of the area, began a volume at 23:04 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, 11.1 hours before the alert went out and 337 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 30 J/kg
Mixed-layer CIN: -290 J/kg
Mixed-layer LCL: 469 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 415 m²/s²
0-3 km storm-relative helicity: 442 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.6

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 Oct 8, 3:44 PM CDT, 2 hours 20 minutes earlier.

Area forecast discussion, Oct 8, 3:44 PM CDT, 2 hours 20 minutes before

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Hazardous weather outlook, Oct 8, 4:11 PM CDT, 1 hour 53 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
411 PM CDT THU OCT 8 2009

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-091130-
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-LEWIS-
SHELBY-MARION-MONROE-RALLS-PIKE-BOONE-AUDRAIN-MONITEAU-COLE-OSAGE-
CALLAWAY-MONTGOMERY-LINCOLN-GASCONADE-WARREN-ST. CHARLES-FRANKLIN-
ST. LOUIS-ST. LOUIS CITY-JEFFERSON-CRAWFORD-WASHINGTON-
ST. FRANCOIS-STE. GENEVIEVE-IRON-MADISON-REYNOLDS-
411 PM CDT THU OCT 8 2009

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

.DAY ONE...TONIGHT

WIDESPREAD SHOWERS AND THUNDERSTORMS CONTAINING HEAVY RAINFALL
CAN BE EXPECTED TONIGHT. TOTAL RAINFALL AMOUNTS OF 3 TO 5 INCHES
CAN BE EXPECTED...WITH LOCALLY HIGHER AMOUNTS POSSIBLE ALONG THE
INTERSTATE 44 CORRIDOR IN MISSOURI AND THE INTERSTATE 64 CORRIDOR
IN ILLINOIS.

THIS HEAVY RAINFALL WILL LIKELY CAUSE SERIOUS FLOODING ON LOCAL
STREAMS...CREEKS AND RIVERS. LOW LYING AREAS AND LOW WATER
CROSSINGS MAY ALSO EXPERIENCE FLASH FLOODING. SEE FLASH FLOOD
WATCH PRODUCT FOR SPECIFIC DETAILS ON THIS FLOODING EVENT.
ADDITIONALLY...THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS
OVER SOUTHERN MISSOURI AND SOUTHERN ILLINOIS TONIGHT. THE PRIMARY
SEVERE WEATHER THREAT WILL BE DAMAGING WINDS IN EXCESS OF 60
MPH...LARGE HAIL AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SHOWERS AND THUNDERSTORMS WILL PERSIST ON FRIDAY BEFORE COMING TO
AN END. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE...MAINLY ALONG
AND SOUTH OF A VANDALIA ILLINOIS TO VIBURNUM MISSOURI LINE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY TONIGHT ACROSS SOUTHERN
MISSOURI AND SOUTHERN ILLINOIS. ADDITIONALLY...RAINFALL REPORTS
FROM STORM SPOTTERS ARE APPRECIATED.

&&

FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR
WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1

CARNEY

In the hours before

Local storm report, Oct 8, 5:07 PM CDT, 57 minutes before

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Local storm report, Oct 8, 5:09 PM CDT, 55 minutes before

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Local storm report, Oct 8, 5:10 PM CDT, 54 minutes before

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Local storm report, Oct 8, 5:11 PM CDT, 53 minutes before

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Local storm report, Oct 8, 5:13 PM CDT, 51 minutes before

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Local storm report, Oct 8, 5:25 PM CDT, 39 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 7:01 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Lincoln, Montgomery, Warren	6 hr
Oct 8, 8:51 AM CDT	Flash Flood Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	4 hr
Oct 8, 9:43 AM CDT	Flash Flood Warning	LSX	Cole, Moniteau, Osage	3 hr
Oct 8, 9:58 AM CDT	River Flood Warning	LSX	Lincoln	55 hr
Oct 8, 10:42 AM CDT	Flash Flood Warning	LSX	Audrain, Boone	3 hr
Oct 8, 12:12 PM CDT	Flash Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Montgomery and 1 more	6 hr
Oct 8, 12:42 PM CDT	Flash Flood Warning	LSX	Lincoln, Saint Charles, Saint Louis, Warren, City of Saint Louis	5 hr
Oct 8, 1:09 PM CDT	Flash Flood Warning	LSX	Franklin, Gasconade	5 hr
Oct 8, 1:12 PM CDT	River Flood Warning	LSX	Osage	55 hr
Oct 8, 1:12 PM CDT	River Flood Warning	LSX	Cole	66 hr
Oct 8, 9:59 AM CDT	Flash Flood Warning	LSX	Fayette	3 hr

Nearby

Areal Flood Warnings in Missouri, 2009 Areal Flood Warnings in Illinois, 2009 Every areal flood warning in 2009

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.