Alert archive / Missouri / Areal Flood Warnings in 2017

Areal Flood Warning 11, NWS St. Louis, MO

April 30, 201710 counties in Missouri; Calhoun County, Greene County, Pike County, Illinois

NWS St. Louis, MO issued this areal flood warning at Apr 30, 2017, 11:00 PM CDT for 10 counties in Missouri; Calhoun County, Greene County, Pike 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: Apr 30, 2017, 11:00 PM CDT (04:00 UTC)
Expired: May 1, 2017, 11:00 AM CDT
In force: 12 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Calhoun County, IL, Greene County, IL, Pike County, IL, Audrain County, MO, Gasconade County, MO, Lincoln County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 85 km from the middle of the area, began a volume at 04:03 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, 4.0 hours before the alert went out and 253 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: 267 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 459 m²/s²
0-3 km storm-relative helicity: 418 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.7

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 Apr 30, 6:40 PM CDT, 4 hours 20 minutes earlier.

Area forecast discussion, Apr 30, 6:40 PM CDT, 4 hours 20 minutes before

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Hazardous weather outlook, Apr 30, 9:33 PM CDT, 1 hour 27 minutes before

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In the hours before

Local storm report, Apr 30, 6:24 PM CDT, 4 hours 36 minutes before

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Local storm report, Apr 30, 6:45 PM CDT, 4 hours 15 minutes before

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Local storm report, Apr 30, 9:00 PM CDT, 2 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
900 PM CDT SUN APR 30 2017

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

0900 PM     HEAVY RAIN       3 E SULLIVAN            38.22N 91.11W
04/30/2017  M6.50 INCH       FRANKLIN           MO   PUBLIC

            RAINFALL TOTAL SINCE FRIDAY NIGHT AT 10PM.
            THE DURATION OF THE HEAVY RAIN EVENT WAS 24
            HOURS.

&&

TES

Local storm report, Apr 30, 9:09 PM CDT, 1 hour 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
909 PM CDT SUN APR 30 2017

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

0908 PM     HEAVY RAIN       SAINT LOUIS             38.64N 90.24W
04/30/2017  M6.58 INCH       ST. LOUIS CITY     MO   TRAINED SPOTTER

            STORM TOTAL.

&&

Local storm report, Apr 30, 9:17 PM CDT, 1 hour 43 minutes before

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Local storm report, Apr 30, 10:26 PM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
1026 PM CDT SUN APR 30 2017

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

1025 PM     HEAVY RAIN       MOSCOW MILLS            38.95N 90.92W
04/30/2017  M6.71 INCH       LINCOLN            MO   PUBLIC

            TOTAL SINCE FRIDAY AFTERNOON.

&&

TES

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 9:01 PM CDT	Areal Flood Warning	LSX	Franklin, Gasconade, Jefferson, Saint Charles, Sainte Genevieve, Saint Louis and 2 more	12 hr
May 1, 4:16 AM CDT	Flash Flood Warning	LSX	Lincoln, Saint Charles	6 hr
May 1, 4:44 AM CDT	Areal Flood Warning	LSX	Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more	12 hr
May 1, 8:59 AM CDT	Areal Flood Warning	LSX	Franklin, Gasconade, Jefferson, Saint Charles, Sainte Genevieve, Saint Louis and 2 more	4 days
May 1, 9:29 AM CDT	Areal Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Osage	24 hr
May 1, 10:58 AM CDT	Areal Flood Warning	LSX	Audrain, Gasconade, Lincoln, Marion, Monroe, Montgomery and 4 more	24 hr
May 1, 4:42 PM CDT	Areal Flood Warning	LSX	Crawford, Iron, Madison, Reynolds, Sainte Genevieve, Saint Francois and 1 more	24 hr
May 1, 9:58 AM CDT	Areal Flood Warning	LSX	Bond, Fayette, Greene, Jersey, Macoupin, Montgomery	24 hr

Nearby

Areal Flood Warnings in Missouri, 2017 Areal Flood Warnings in Illinois, 2017 Every areal flood warning in 2017

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.