Alert archive / Nebraska / Areal Flood Warnings in 2011

Areal Flood Warning 4, NWS North Platte, NE

May 25, 2011Lincoln County, Nebraska

NWS North Platte, NE issued this areal flood warning at May 25, 2011, 4:51 AM CDT for Lincoln County, Nebraska. It was in force for 48 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 25, 2011, 4:51 AM CDT (09:51 UTC)
Expired: May 27, 2011, 4:30 AM CDT
In force: 48 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

County Lincoln County, NE

The radar

The North Platte radar (KLNX), 102 km from the middle of the area, began a volume at 09:53 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 9.9 hours before the alert went out and 15 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: 786 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 103 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 areal flood warning 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 areal flood warning went out at May 25, 3:48 AM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, May 25, 3:48 AM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, May 24, 10:17 PM CDT, 6 hours 34 minutes before

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In the hours before

Local storm report, May 25, 2:15 AM CDT, 2 hours 36 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
May 24, 7:47 PM CDT	Flash Flood Warning	LBF	Frontier, Hayes	6 hr
May 25, 1:48 AM CDT	Areal Flood Warning	LBF	Frontier	9 hr

Nearby

Areal Flood Warnings in Nebraska, 2011 Every areal flood warning in 2011

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.