Alert archive / Nebraska / Special Weather Statements in 2017
Special Weather Statement, NWS Omaha, NE
NWS Omaha, NE issued this special weather statement at Aug 21, 2017, 8:09 PM CDT for 6 counties in Nebraska; Harrison County, Shelby County, Iowa. It was in force for 66 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2017, 8:09 PM CDT (01:09 UTC)
- Expired
- Aug 21, 2017, 9:15 PM CDT
- In force
- 66 min
- Issued by
- NWS Omaha, NE
Counties Harrison County, IA, Shelby County, IA, Burt County, NE, Butler County, NE, Colfax County, NE, Dodge County, NE, Platte County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 59 km from the middle of the area, began a volume at 01:09 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
Topeka, KS (KFOE), launched 00:00Z, 1.2 hours before the alert went out and 309 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.
- Mixed-layer CAPE
- 2114 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1421 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 9.7
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Aug 21, 6:41 PM CDT, 1 hour 28 minutes earlier.
Area forecast discussion, Aug 21, 6:41 PM CDT, 1 hour 28 minutes before
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Hazardous Weather Outlook National Weather Service Omaha/Valley NE 343 PM CDT Mon Aug 21 2017 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-221045- Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont- Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison- Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline- Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson- 343 PM CDT Mon Aug 21 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...TONIGHT AND TUESDAY Thunderstorms should spread southeast across the area tonight. There is some potential for severe storms, with large hail and damaging winds. Locally heavy rain is also possible. The main severe threat is prior to 2 AM CDT. River flooding will continue today along parts of the Big Blue River and Lincoln Creek, mainly in Butler, Seward and Saline counties. Stream levels will likely rise across portions of western Iowa in response to heavy rain. .DAYS TWO THROUGH SEVEN...TUESDAY NIGHT THROUGH MONDAY Some flooding remains possible along the Big Blue River into Tuesday. Thunderstorm chances return for parts of the area Wednesday night into Thursday. Severe storms are not expected. There will also be off and on chances for storms from Thursday night into Monday. ..SPOTTER INFORMATION STATEMENT... Spotter activation is not expected to be needed tonight, but please pass along any reports. Activation will not be needed on Tuesday.
In the hours before
Special weather statement, Aug 21, 3:16 PM CDT, 4 hours 53 minutes before
Special Weather Statement
National Weather Service Omaha/Valley Nebraska
316 PM CDT MON AUG 21 2017
NEZ011-012-212100-
Cedar NE-Knox NE-
316 PM CDT MON AUG 21 2017
...Significant Weather Advisory for EASTERN KNOX AND NORTHERN CEDAR
COUNTIES UNTIL 400 PM CDT...
At 315 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lewis And Clark State Recreation Area, moving east at 40 mph.
Winds in excess of 40 mph and hail up to dime size will be possible
with this storm.
Locations impacted include...
Yankton, Wynot, Crofton, St. Helena, Obert, Gavins Point Dam And
Campgrounds, Lewis And Clark State Recreation Area, Brooky Bottom and
St. Helena Boat Dock.
This includes Highway 81 in Nebraska between mile markers 206 and
215.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A severe thunderstorm watch remains in effect until 700 PM CDT for
northeastern Nebraska.
LAT...LON 4285 9729 4285 9723 4281 9721 4280 9716
4277 9713 4276 9702 4269 9702 4274 9757
4285 9756 4286 9750 4285 9744 4287 9742
4287 9738 4285 9736 4287 9731
TIME...MOT...LOC 2015Z 272DEG 33KT 4283 9750
PEARSONSpecial weather statement, Aug 21, 4:22 PM CDT, 3 hours 47 minutes before
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</html>The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 9:31 PM CDT | Special Weather Statement | OAX | Butler, Cass, Douglas, Lancaster, Sarpy, Saunders | 59 min |
Nearby
Special Weather Statements in Nebraska, 2017Special Weather Statements in Iowa, 2017Every special weather statement in 2017
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.