Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 274, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Sep 18, 2018, 4:13 PM CDT for Johnson County, Lancaster County, Otoe County, Nebraska. It was in force for 32 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
- Sep 18, 2018, 4:13 PM CDT (21:13 UTC)
- Expired
- Sep 18, 2018, 4:45 PM CDT
- In force
- 32 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Johnson County, NE, Lancaster County, NE, Otoe County, NE
The radar
The Omaha radar (KOAX), 79 km from the middle of the area, began a volume at 21:16 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, 9.2 hours before the alert went out and 79 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
- 1380 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 1445 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- -25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Sep 18, 3:28 PM CDT, 45 minutes earlier.
Area forecast discussion, Sep 18, 3:28 PM CDT, 45 minutes before
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</html>Hazardous weather outlook, Sep 18, 11:36 AM CDT, 4 hours 37 minutes before
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 1136 AM CDT Tue Sep 18 2018 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-190645- 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- 1136 AM CDT Tue Sep 18 2018 This Hazardous Weather Outlook is for portions of southwest Iowa...west central Iowa...east central Nebraska...northeast Nebraska and southeast Nebraska. .DAY ONE...This Afternoon and Tonight Isolated strong to severe thunderstorms are possible north of Interstate 80. There is a marginal risk for severe storms, with isolated one inch hail, gusty winds, and heavy downpours of rain being the main threats. Minor flooding will continue along the Missouri River upstream of Lewis and Clark Lake in Knox County and in the vicinity of Brownsville. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Isolated thunderstorms possible north of Interstate 80 Wednesday, with more widespread thunderstorm activity for all of eastern Nebraska and western Iowa Wednesday night and Thursday. Though the overall risk of severe storms is low over this period, a few stronger storms are possible. Minor flooding will continue along the Missouri River upstream of Lewis and Clark Lake in Knox County. Minor flooding along the Missouri River in the vicinity of Brownsville should subside by Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time, however local spotters may be needed for locally strong to severe storms. Zapotocny
In the hours before
Local storm report, Sep 18, 3:34 PM CDT, 39 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 |
|---|---|---|---|---|
| Sep 18, 2:29 PM CDT | Special Weather Statement | OAX | Dodge | 46 min |
| Sep 18, 2:54 PM CDT | Severe Thunderstorm Warning | OAX | Saunders | 36 min |
| Sep 18, 3:22 PM CDT | Severe Thunderstorm Warning | OAX | Saunders | 38 min |
| Sep 18, 3:55 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Sarpy, Saunders | 35 min |
| Sep 18, 4:00 PM CDT | Special Weather Statement | OAX | Otoe | 30 min |
| Sep 18, 4:04 PM CDT | Special Weather Statement | OAX | Lancaster | 56 min |
| Sep 18, 4:08 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Lancaster, Sarpy, Saunders | 52 min |
| Sep 18, 4:25 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Sarpy | 50 min |
| Sep 18, 4:35 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Lancaster, Otoe | 40 min |
| Sep 18, 4:49 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Otoe | 41 min |
| Sep 18, 11:28 AM CDT | Special Weather Statement | OAX | Monona | 32 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 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.