Alert archive / Missouri / Areal Flood Advisories in 2012

Areal Flood Advisory 6, NWS St. Louis, MO

April 14, 2012Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this areal flood advisory at Apr 14, 2012, 1:53 AM CDT for Saint Louis County, City of Saint Louis, Missouri. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Apr 14, 2012, 1:53 AM CDT (06:53 UTC)
Expired: Apr 14, 2012, 6:00 AM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon

Counties City of Saint Louis, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 32 km from the middle of the area, began a volume at 06:56 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 00:00Z, 6.9 hours before the alert went out and 362 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: 677 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 advisory went out at Apr 14, 12:16 AM CDT, 1 hour 37 minutes earlier.

Area forecast discussion, Apr 14, 12:16 AM CDT, 1 hour 37 minutes before

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Hazardous weather outlook, Apr 13, 9:50 PM CDT, 4 hours 3 minutes before

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In the hours before

Local storm report, Apr 13, 9:20 PM CDT, 4 hours 33 minutes before

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Local storm report, Apr 13, 9:35 PM CDT, 4 hours 18 minutes before

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Special weather statement, Apr 13, 9:38 PM CDT, 4 hours 15 minutes before

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Special weather statement, Apr 13, 9:43 PM CDT, 4 hours 10 minutes before

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Special weather statement, Apr 13, 10:06 PM CDT, 3 hours 47 minutes before

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Local storm report, Apr 13, 10:28 PM CDT, 3 hours 25 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
Apr 13, 9:19 PM CDT	Flash Flood Watch	LSX	Boone, Callaway, Cole, Crawford, Franklin, Gasconade and 10 more	13 hr
Apr 14, 1:26 AM CDT	River Flood Warning	LSX	Cole	3 days
Apr 14, 6:27 AM CDT	Areal Flood Advisory	LSX	Cole, Osage	4 hr
Apr 14, 7:06 AM CDT	River Flood Warning	LSX	Osage	24 hr
Apr 14, 7:13 AM CDT	Flash Flood Warning	LSX	Cole, Osage	6 hr
Apr 14, 7:38 AM CDT	Areal Flood Advisory	LSX	Gasconade	4 hr
Apr 14, 11:14 AM CDT	River Flood Warning	LSX	Saint Charles	20 hr
Apr 14, 3:30 PM CDT	River Flood Warning	LSX	Lincoln	16 hr

Nearby

Areal Flood Advisories in Missouri, 2012 Every areal flood advisory in 2012

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.