Alert archive / Illinois / Areal Flood Warnings in 2013

Areal Flood Warning 40, NWS St. Louis, MO

June 23, 2013Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this areal flood warning at Jun 23, 2013, 11:57 PM CDT for Madison County, Saint Clair County, Illinois. It was in force for 10 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: Jun 23, 2013, 11:57 PM CDT (04:57 UTC)
Expired: Jun 24, 2013, 10:00 AM CDT
In force: 10 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Madison County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 67 km from the middle of the area, began a volume at 04:59 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, 5.0 hours before the alert went out and 202 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: 685 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jun 23, 11:41 PM CDT, 16 minutes earlier.

Area forecast discussion, Jun 23, 11:41 PM CDT, 16 minutes before

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Hazardous weather outlook, Jun 23, 11:50 PM CDT, 7 minutes before

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In the hours before

Local storm report, Jun 23, 8:04 PM CDT, 3 hours 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
804 PM CDT SUN JUN 23 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0746 PM     FLOOD            CASEYVILLE              38.63N  90.03W
06/23/2013                   ST. CLAIR          IL   BROADCAST MEDIA

            WATER 1 TO 2 FEET DEEP ON SOME ROADS

&&

KARLZ

Local storm report, Jun 23, 8:13 PM CDT, 3 hours 44 minutes before

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Local storm report, Jun 23, 8:15 PM CDT, 3 hours 42 minutes before

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Local storm report, Jun 23, 9:01 PM CDT, 2 hours 56 minutes before

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Local storm report, Jun 23, 9:05 PM CDT, 2 hours 52 minutes before

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Local storm report, Jun 23, 10:45 PM CDT, 1 hour 12 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
Jun 23, 8:13 PM CDT	Flash Flood Warning	LSX	Saint Clair	4 hr

Nearby

Areal Flood Warnings in Illinois, 2013 Every areal flood warning in 2013

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.