Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 157, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jun 19, 2018, 12:29 AM CDT for Cass County, Douglas County, Sarpy County, Nebraska; Mills County, Pottawattamie County, Iowa. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 19, 2018, 12:29 AM CDT (05:29 UTC)
- Expired
- Jun 19, 2018, 1:00 AM CDT
- In force
- 31 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Mills County, IA, Pottawattamie County, IA, Cass County, NE, Douglas County, NE, Sarpy County, NE
The radar
The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 05:30 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, 5.5 hours before the alert went out and 43 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
- 992 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 896 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 301 m²/s²
- 0-3 km storm-relative helicity
- 336 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.2
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 18, 11:35 PM CDT, 54 minutes earlier.
Area forecast discussion, Jun 18, 11:35 PM CDT, 54 minutes before
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</html>Hazardous weather outlook, Jun 18, 8:55 PM CDT, 3 hours 34 minutes before
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Special weather statement, Jun 18, 10:11 PM CDT, 2 hours 18 minutes before
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</html>Local storm report, Jun 18, 10:36 PM CDT, 1 hour 53 minutes before
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</html>Local storm report, Jun 18, 10:39 PM CDT, 1 hour 50 minutes before
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</html>Special weather statement, Jun 18, 11:59 PM CDT, 30 minutes before
Special Weather Statement National Weather Service Omaha/Valley Nebraska 1159 PM CDT MON JUN 18 2018 IAZ055-069-079-NEZ045-052-053-067-190530- Pottawattamie IA-Mills IA-Harrison IA-Cass NE-Sarpy NE-Washington NE- Douglas NE- 1159 PM CDT MON JUN 18 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MILLS...WESTERN POTTAWATTAMIE...SOUTHEASTERN HARRISON...NORTHEASTERN SARPY... SOUTHEASTERN WASHINGTON...EASTERN DOUGLAS AND NORTHEASTERN CASS COUNTIES UNTIL 1230 AM CDT... At 1158 PM CDT, Doppler radar was tracking strong thunderstorms along a line extending from 6 miles south of Fort Calhoun to near Papillion. Movement was northeast at 40 mph. Winds in excess of 40 mph and heavy rain will be possible with these storms. Locations impacted include... Omaha, Council Bluffs, Bellevue, Papillion, La Vista, Ralston, Cedar Creek, Offutt AFB, Carter Lake, Crescent, Lake Manawa State Park, Camp Maha, Hitchcock Nature Center and Narrows River Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... Heavy rain is also occurring with these storms, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4155 9570 4115 9572 4101 9612 4142 9607 TIME...MOT...LOC 0458Z 229DEG 35KT 4137 9601 4113 9605 MILLER
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 7:13 PM CDT | Severe Thunderstorm Warning | OAX | Thurston | 32 min |
| Jun 18, 7:43 PM CDT | Special Weather Statement | OAX | Knox | 32 min |
| Jun 18, 9:43 PM CDT | Special Weather Statement | OAX | Butler | 32 min |
| Jun 18, 10:11 PM CDT | Special Weather Statement | OAX | Wayne | 34 min |
| Jun 18, 10:20 PM CDT | Special Weather Statement | OAX | Saunders | 40 min |
| Jun 18, 10:37 PM CDT | Special Weather Statement | OAX | Thurston | 38 min |
| Jun 18, 11:59 PM CDT | Special Weather Statement | OAX | Douglas | 31 min |
| Jun 19, 6:24 AM CDT | Special Weather Statement | OAX | Colfax | 36 min |
| Jun 19, 6:29 AM CDT | Special Weather Statement | OAX | Boone | 31 min |
| Jun 19, 6:51 AM CDT | Severe Thunderstorm Warning | OAX | Boone, Platte | 24 min |
| Jun 19, 7:15 AM CDT | Areal Flood Advisory | OAX | Douglas, Sarpy | 3 hr |
| Jun 19, 8:00 AM CDT | Areal Flood Advisory | OAX | Douglas, Sarpy | 3 hr |
| Jun 19, 8:48 AM CDT | Areal Flood Warning | OAX | Douglas | 3 hr |
| Jun 19, 9:44 AM CDT | River Flood Warning | OAX | Nemaha | 43 days |
| Jun 19, 9:44 AM CDT | River Flood Warning | OAX | Richardson | 36 days |
| Jun 19, 3:16 PM CDT | Flash Flood Watch | OAX | Cass, Dodge, Douglas, Gage, Jefferson, Lancaster and 6 more | 16 hr |
| Jun 19, 3:55 PM CDT | Severe Thunderstorm Warning | OAX | Jefferson, Saline | 65 min |
| Jun 19, 4:51 PM CDT | Severe Thunderstorm Warning | OAX | Lancaster, Saline | 54 min |
| Jun 19, 5:00 PM CDT | Severe Thunderstorm Warning | OAX | Jefferson | 30 min |
| Jun 19, 5:09 PM CDT | Special Weather Statement | OAX | Lancaster | 36 min |
| Jun 19, 5:28 PM CDT | Special Weather Statement | OAX | Jefferson | 47 min |
| Jun 19, 5:34 PM CDT | Areal Flood Advisory | OAX | Jefferson | 3 hr |
| Jun 19, 5:42 PM CDT | Special Weather Statement | OAX | Lancaster | 33 min |
| Jun 19, 6:07 PM CDT | Flash Flood Warning | OAX | Jefferson | 3 hr |
| Jun 19, 6:13 PM CDT | Flash Flood Warning | OAX | Gage, Lancaster, Saline | 3 hr |
| Jun 18, 7:29 PM CDT | Special Weather Statement | OAX | Shelby | 31 min |
| Jun 18, 11:50 PM CDT | Areal Flood Advisory | OAX | Mills, Pottawattamie | 3 hr |
| Jun 19, 12:48 AM CDT | Special Weather Statement | OAX | Mills | 27 min |
| Jun 19, 12:59 AM CDT | Special Weather Statement | OAX | Mills, Montgomery | 46 min |
| Jun 19, 1:23 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Montgomery, Page | 41 min |
| Jun 19, 6:06 PM CDT | Special Weather Statement | OAX | Shelby | 39 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2018Severe Thunderstorm Warnings in Iowa, 2018Every severe thunderstorm warning in 2018
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.