Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 215, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jul 4, 2018, 5:39 PM CDT for Knox County, Nebraska. It was in force for 36 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
- Jul 4, 2018, 5:39 PM CDT (22:39 UTC)
- Expired
- Jul 4, 2018, 6:15 PM CDT
- In force
- 36 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Knox County, NE
The radar
The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 22:38 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, 10.7 hours before the alert went out and 193 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
- 762 J/kg
- Mixed-layer CIN
- -257 J/kg
- Mixed-layer LCL
- 1648 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -53 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 Jul 4, 3:30 PM CDT, 2 hours 9 minutes earlier.
Area forecast discussion, Jul 4, 3:30 PM CDT, 2 hours 9 minutes before
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</html>Hazardous weather outlook, Jul 4, 4:21 PM CDT, 1 hour 18 minutes before
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 421 PM CDT Wed Jul 4 2018 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-051130- 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- 421 PM CDT Wed Jul 4 2018 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 Thursday A Heat Advisory continues into the evening as the combination of temperatures in the 90s and high humidity will make it feel more like 105. There is a risk for severe thunderstorms tonight in areas along and north of Interstate 80. Damaging winds will be the primary hazard, but large hail and an isolated tornado will be possible through mid evening in northeast Nebraska where storms fire first. A cold front just to the north of northeast Nebraska will be the focus for storm development. That front will begin moving south this evening, and could trigger storms along it through the late evening as it approaches I-80. Flooding will continue along the Missouri River mainly downstream from Omaha. Minor flooding is occurring along Lincoln Creek in Seward county, and should drop below flood stage by Thursday. .DAYS TWO THROUGH SEVEN...Thursday night through Wednesday Thunderstorms will be possible Thursday and Thursday night. Flooding will continue along the Missouri River mainly downstream from Omaha into the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation should not be needed through Thursday.
In the hours before
Special weather statement, Jul 4, 5:00 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 |
|---|---|---|---|---|
| Jul 4, 3:42 AM CDT | Heat Advisory | OAX | Antelope, Boone, Burt, Butler, Cass, Cedar and 24 more | 16 hr |
| Jul 4, 4:28 PM CDT | Severe Thunderstorm Warning | OAX | Antelope, Knox, Pierce | 47 min |
| Jul 4, 5:00 PM CDT | Special Weather Statement | OAX | Knox | 30 min |
| Jul 4, 5:13 PM CDT | Severe Thunderstorm Warning | OAX | Cedar, Knox | 62 min |
| Jul 4, 5:23 PM CDT | Special Weather Statement | OAX | Knox | 37 min |
| Jul 4, 6:06 PM CDT | Severe Thunderstorm Warning | OAX | Cedar, Knox, Pierce | 34 min |
| Jul 4, 6:46 PM CDT | Special Weather Statement | OAX | Pierce, Wayne | 44 min |
| Jul 4, 6:53 PM CDT | Areal Flood Advisory | OAX | Cedar, Knox, Pierce | 3 hr |
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.