Alert archive / Nebraska / Flash Flood Watches in 2007

Flash Flood Watch 7, NWS Omaha, NE

August 6, 20077 counties in Nebraska; 5 counties in Iowa

NWS Omaha, NE issued this flash flood watch at Aug 6, 2007, 10:24 PM CDT for 7 counties in Nebraska; 5 counties in Iowa. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Aug 6, 2007, 10:24 PM CDT (03:24 UTC)
Expired: Aug 7, 2007, 4:31 AM CDT
In force: 6 hr
Issued by: NWS Omaha, NE
Flood severity: None

Counties Harrison County, IA, Mills County, IA, Montgomery County, IA, Pottawattamie County, IA, Shelby County, IA, Butler County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.4 hours before the alert went out and 27 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: 2407 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1157 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 362 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 22.6

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 Omaha, NE wrote its last area forecast discussion before this flash flood watch went out at Aug 6, 3:45 PM CDT, 6 hours 39 minutes earlier.

Area forecast discussion, Aug 6, 3:45 PM CDT, 6 hours 39 minutes before

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Hazardous weather outlook, Aug 6, 5:02 PM CDT, 5 hours 22 minutes before

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In the hours before

Local storm report, Aug 6, 7:03 PM CDT, 3 hours 21 minutes before

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Local storm report, Aug 6, 7:19 PM CDT, 3 hours 5 minutes before

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Local storm report, Aug 6, 9:30 PM CDT, 54 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 9:08 PM CDT	Severe Thunderstorm Warning	OAX	Washington	25 min
Aug 7, 8:00 AM CDT	River Flood Warning	OAX	Butler	4 days
Aug 7, 4:23 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha	67 min
Aug 7, 4:55 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	35 min
Aug 7, 5:27 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	33 min
Aug 6, 9:54 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	25 min
Aug 7, 5:09 PM CDT	Severe Thunderstorm Warning	OAX	Page	51 min

Nearby

Flash Flood Watches in Nebraska, 2007 Flash Flood Watches in Iowa, 2007 Every flash flood watch in 2007

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.