Alert archive / Nebraska / Flash Flood Watches in 2014

Flash Flood Watch 7, NWS Omaha, NE

August 26, 20149 counties in Nebraska; Harrison County, Pottawattamie County, Shelby County, Iowa

NWS Omaha, NE issued this flash flood watch at Aug 26, 2014, 3:20 PM CDT for 9 counties in Nebraska; Harrison County, Pottawattamie County, Shelby County, Iowa. It took effect at Aug 26, 2014, 10:00 PM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Aug 26, 2014, 3:20 PM CDT (20:20 UTC)
In effect from: Aug 26, 2014, 10:00 PM CDT
Expired: Aug 27, 2014, 10:00 AM CDT
In force: 12 hr
Issued by: NWS Omaha, NE
Flood severity: None

Counties Harrison County, IA, Pottawattamie County, IA, Shelby County, IA, Butler County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Platte County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 10 km from the middle of the area, began a volume at 20:23 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

Omaha, NE (KOAX), launched 12:00Z, 8.3 hours before the alert went out and 10 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: 1425 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -79 m²/s²
0-3 km storm-relative helicity: -59 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 Omaha, NE wrote its last area forecast discussion before this flash flood watch went out at Aug 26, 3:00 PM CDT, 20 minutes earlier.

Area forecast discussion, Aug 26, 3:00 PM CDT, 20 minutes before

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Hazardous weather outlook, Aug 26, 11:39 AM CDT, 3 hours 41 minutes before

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In the hours before

Local storm report, Aug 26, 9:54 AM CDT, 5 hours 26 minutes before

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Local storm report, Aug 26, 9:57 AM CDT, 5 hours 23 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 25, 11:46 PM CDT	Special Weather Statement	OAX	Saunders	44 min
Aug 26, 12:05 AM CDT	Special Weather Statement	OAX	Douglas	40 min
Aug 26, 12:33 AM CDT	Special Weather Statement	OAX	Butler, Dodge, Saunders, Washington	42 min
Aug 26, 12:50 AM CDT	Special Weather Statement	OAX	Douglas	40 min
Aug 26, 12:54 AM CDT	Areal Flood Advisory	OAX	Butler, Dodge, Douglas, Saunders, Seward	3 hr
Aug 26, 1:14 AM CDT	Areal Flood Advisory	OAX	Dodge, Douglas, Washington	3 hr
Aug 26, 1:25 AM CDT	Flash Flood Warning	OAX	Butler, Saunders	2 hr
Aug 26, 1:53 AM CDT	Areal Flood Advisory	OAX	Douglas	112 min
Aug 26, 2:22 AM CDT	Special Weather Statement	OAX	Cass, Lancaster	38 min

Nearby

Flash Flood Watches in Nebraska, 2014 Flash Flood Watches in Iowa, 2014 Every flash flood watch in 2014

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.