Alert archive / Nebraska / Flash Flood Watches in 2007

Flash Flood Watch 12, NWS North Platte, NE

August 7, 20075 counties in Nebraska

NWS North Platte, NE issued this flash flood watch at Aug 7, 2007, 2:05 PM MDT for 5 counties in Nebraska. It took effect at Aug 7, 2007, 6:00 PM MDT. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Aug 7, 2007, 2:05 PM MDT (20:05 UTC)
In effect from: Aug 7, 2007, 6:00 PM MDT
Expired: Aug 8, 2007, 5:21 AM MDT
In force: 11 hr
Issued by: NWS North Platte, NE
Flood severity: None

Counties Chase County, NE, Frontier County, NE, Hayes County, NE, Lincoln County, NE, Perkins County, NE

The radar

The North Platte radar (KLNX), 147 km from the middle of the area, began a volume at 20:09 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

Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 202 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: 33 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 1725 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 3 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 North Platte, NE wrote its last area forecast discussion before this flash flood watch went out at Aug 7, 1:45 PM MDT, 20 minutes earlier.

Area forecast discussion, Aug 7, 1:45 PM MDT, 20 minutes before

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Hazardous weather outlook, Aug 7, 4:55 AM MDT, 9 hours 10 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 11:21 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	39 min
Aug 6, 11:42 PM MDT	Flash Flood Warning	LBF	Frontier	6 hr

Nearby

Flash Flood Watches in Nebraska, 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; radar from the NEXRAD Level II archive.