Alert archive / Missouri / Flash Flood Watches in 2010

Flash Flood Watch 18, NWS St. Louis, MO

November 24, 201016 counties in Missouri; 14 counties in Illinois

NWS St. Louis, MO issued this flash flood watch at Nov 24, 2010, 3:48 PM CST for 16 counties in Missouri; 14 counties in Illinois. It took effect at Nov 24, 2010, 4:00 PM CST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Nov 24, 2010, 3:48 PM CST (21:48 UTC)
In effect from: Nov 24, 2010, 4:00 PM CST
Expired: Nov 25, 2010, 4:06 AM CST
In force: 12 hr
Issued by: NWS St. Louis, MO
Flood severity: None

All 30 counties

Bond County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 38 km from the middle of the area, began a volume at 21:51 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, 9.8 hours before the alert went out and 352 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 474 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 558 m²/s²
0-3 km storm-relative helicity: 585 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Nov 24, 12:03 PM CST, 3 hours 45 minutes earlier.

Area forecast discussion, Nov 24, 12:03 PM CST, 3 hours 45 minutes before

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Hazardous weather outlook, Nov 24, 7:42 AM CST, 8 hours 6 minutes before

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In the hours before

Local storm report, Nov 24, 12:29 PM CST, 3 hours 19 minutes before

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Local storm report, Nov 24, 12:30 PM CST, 3 hours 18 minutes before

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Local storm report, Nov 24, 1:23 PM CST, 2 hours 25 minutes before

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Local storm report, Nov 24, 1:33 PM CST, 2 hours 15 minutes before

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Local storm report, Nov 24, 1:36 PM CST, 2 hours 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
Nov 24, 7:13 AM CST	Areal Flood Advisory	LSX	Franklin, Saint Charles, Saint Louis, City of Saint Louis	7 hr
Nov 24, 12:26 PM CST	River Flood Warning	LSX	Saint Charles	33 hr
Nov 24, 12:25 PM CST	Areal Flood Advisory	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	5 hr

Nearby

Flash Flood Watches in Missouri, 2010 Flash Flood Watches in Illinois, 2010 Every flash flood watch in 2010

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.