Alert archive / Nebraska / Flash Flood Watches in 2014

Flash Flood Watch 8, NWS Omaha, NE

August 27, 201421 counties in Nebraska; 8 counties in Iowa

NWS Omaha, NE issued this flash flood watch at Aug 27, 2014, 11:29 PM CDT for 21 counties in Nebraska; 8 counties in Iowa. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Aug 27, 2014, 11:29 PM CDT (04:29 UTC)
Expired: Aug 28, 2014, 10:31 AM CDT
In force: 11 hr
Issued by: NWS Omaha, NE
Flood severity: None

All 29 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Lancaster County, NE, Madison County, NE, Otoe County, NE, Pierce County, NE, Platte County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 15 km from the middle of the area, began a volume at 04:29 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 00:00Z, 4.5 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: 48 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 114 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 27, 6:40 PM CDT, 4 hours 49 minutes earlier.

Area forecast discussion, Aug 27, 6:40 PM CDT, 4 hours 49 minutes before

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Hazardous weather outlook, Aug 27, 5:27 PM CDT, 6 hours 2 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 28, 2:45 AM CDT	Areal Flood Advisory	OAX	Cass, Otoe	3 hr
Aug 28, 2:58 AM CDT	Areal Flood Advisory	OAX	Butler, Saline, Seward	3 hr
Aug 28, 3:22 AM CDT	Areal Flood Advisory	OAX	Cass, Lancaster, Saunders	3 hr
Aug 28, 3:39 AM CDT	Areal Flood Advisory	OAX	Cass	3 hr
Aug 28, 4:56 AM CDT	Areal Flood Advisory	OAX	Sarpy	3 hr
Aug 28, 5:09 AM CDT	River Flood Warning	OAX	Saline	7 days
Aug 28, 5:09 AM CDT	River Flood Warning	OAX	Seward	6 days
Aug 28, 5:10 AM CDT	Areal Flood Advisory	OAX	Saunders	3 hr
Aug 28, 5:29 AM CDT	Flash Flood Warning	OAX	Saunders	106 min
Aug 28, 5:56 AM CDT	Areal Flood Advisory	OAX	Dodge, Douglas, Sarpy, Saunders, Washington	2 hr
Aug 28, 7:15 AM CDT	Areal Flood Advisory	OAX	Burt	2 hr
Aug 28, 10:27 AM CDT	River Flood Warning	OAX	Saunders	34 hr
Aug 28, 10:33 AM CDT	River Flood Warning	OAX	Seward	70 hr
Aug 28, 1:49 PM CDT	Areal Flood Warning	OAX	Saunders	12 hr
Aug 28, 6:13 AM CDT	Areal Flood Advisory	OAX	Mills, Montgomery, Pottawattamie	2 hr
Aug 28, 1:52 PM CDT	River Flood Warning	OAX	Fremont	23 hr

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.