Alert archive / Nebraska / Flash Flood Watches in 2016

Flash Flood Watch 7, NWS Omaha, NE

August 29, 201613 counties in Nebraska; 5 counties in Iowa

NWS Omaha, NE issued this flash flood watch at Aug 29, 2016, 2:39 PM CDT for 13 counties in Nebraska; 5 counties in Iowa. It took effect at Aug 29, 2016, 4:00 PM CDT. It was in force for 27 hr.

The area

The counties it named.

The facts

Issued: Aug 29, 2016, 2:39 PM CDT (19:39 UTC)
In effect from: Aug 29, 2016, 4:00 PM CDT
Expired: Aug 30, 2016, 6:44 PM CDT
In force: 27 hr
Issued by: NWS Omaha, NE
Flood severity: None

Counties Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 70 km from the middle of the area, began a volume at 19:39 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, 7.7 hours before the alert went out and 70 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: 948 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 47 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 29, 12:31 PM CDT, 2 hours 8 minutes earlier.

Area forecast discussion, Aug 29, 12:31 PM CDT, 2 hours 8 minutes before

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Hazardous weather outlook, Aug 29, 11:40 AM CDT, 2 hours 59 minutes before

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In the hours before

Local storm report, Aug 29, 9:41 AM CDT, 4 hours 58 minutes before

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Local storm report, Aug 29, 9:47 AM CDT, 4 hours 52 minutes before

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Local storm report, Aug 29, 9:56 AM CDT, 4 hours 43 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, 7:05 PM CDT	Flash Flood Warning	OAX	Johnson, Nemaha	3 hr
Aug 29, 3:59 PM CDT	Special Weather Statement	OAX	Seward	31 min
Aug 29, 4:38 PM CDT	Special Weather Statement	OAX	Lancaster	37 min
Aug 29, 5:02 PM CDT	Special Weather Statement	OAX	Butler	28 min
Aug 29, 5:23 PM CDT	Special Weather Statement	OAX	Lancaster	22 min
Aug 29, 5:58 PM CDT	Special Weather Statement	OAX	Colfax	32 min
Aug 29, 5:53 PM CDT	Areal Flood Advisory	OAX	Pottawattamie	3 hr

Nearby

Flash Flood Watches in Nebraska, 2016 Flash Flood Watches in Iowa, 2016 Every flash flood watch in 2016

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.