Alert archive / Missouri / Flash Flood Watches in 2010

Flash Flood Watch 12, NWS St. Louis, MO

July 30, 201018 counties in Missouri; Adams County, Brown County, Pike County, Illinois

NWS St. Louis, MO issued this flash flood watch at Jul 30, 2010, 2:15 PM CDT for 18 counties in Missouri; Adams County, Brown County, Pike County, Illinois. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jul 30, 2010, 2:15 PM CDT (19:15 UTC)
Expired: Jul 31, 2010, 4:12 AM CDT
In force: 14 hr
Issued by: NWS St. Louis, MO
Flood severity: None

All 21 counties

Adams County, IL, Brown County, IL, Pike County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Franklin County, MO, Gasconade County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 101 km from the middle of the area, began a volume at 19:18 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

Davenport, (KDVN), launched 12:00Z, 7.3 hours before the alert went out and 281 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: 1090 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 30, 1:01 PM CDT, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 30, 1:01 PM CDT, 1 hour 14 minutes before

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Hazardous weather outlook, Jul 30, 2:13 PM CDT, 2 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
Jul 30, 4:27 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Moniteau	48 min
Jul 30, 4:28 PM CDT	Flash Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau	6 hr
Jul 30, 4:37 PM CDT	Flash Flood Warning	LSX	Audrain, Monroe	6 hr
Jul 30, 4:45 PM CDT	Areal Flood Advisory	LSX	Madison, Sainte Genevieve, Saint Francois	4 hr
Jul 30, 5:12 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	48 min
Jul 30, 5:20 PM CDT	Flash Flood Warning	LSX	Audrain, Callaway, Gasconade, Montgomery, Osage	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.