Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 16, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Apr 12, 2020, 5:16 AM CDT for Cass County, Lancaster County, Saunders County, Nebraska. It was in force for 29 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
- Apr 12, 2020, 5:16 AM CDT (10:16 UTC)
- Expired
- Apr 12, 2020, 5:45 AM CDT
- In force
- 29 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Cass County, NE, Lancaster County, NE, Saunders County, NE
The radar
The Omaha radar (KOAX), 40 km from the middle of the area, began a volume at 10:15 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, 10.3 hours before the alert went out and 40 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2081 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 181 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 Apr 12, 4:58 AM CDT, 18 minutes earlier.
Area forecast discussion, Apr 12, 4:58 AM CDT, 18 minutes before
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</html>Hazardous weather outlook, Apr 11, 8:16 PM CDT, 9 hours before
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 816 PM CDT Sat Apr 11 2020 NEZ011-012-016>018-030>032-121530- Knox-Cedar-Antelope-Pierce-Wayne-Boone-Madison-Stanton- 816 PM CDT Sat Apr 11 2020 This Hazardous Weather Outlook is for portions of northeast Nebraska. .DAY ONE...Tonight and Sunday A winter storm warning is in effect from late tonight into Sunday night. Rain is expected to change over to all snow early Sunday morning. Snow will be heavy at times and is expected to persist through the day before diminishing on Sunday evening. Snow accumulations ranging anywhere from of three to nine inches are possible. In addition, north winds gusting to 50 mph will result in considerable blowing snow causing blizzard or near-blizzard conditions through the day. Trees, power lines, and tent facilities will be susceptible to damage, and power outages are possible. .DAYS TWO THROUGH SEVEN...Sunday night through Saturday Both the snow and winds are expected to diminish on Sunday evening. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. However, snowfall reports are appreciated. IAZ043-NEZ015-033-034-042>045-050-051-121530- Monona-Thurston-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders- 816 PM CDT Sat Apr 11 2020 This Hazardous Weather Outlook is for portions of west central Iowa...east central Nebraska and northeast Nebraska. .DAY ONE...Tonight and Sunday A winter weather advisory is in effect for Sunday. Rain is expected to change over to all snow on Sunday morning into early afternoon. Accumulations of one to three inches are possible. The snow combined with strong north winds with gusts to 50 mph will result in reduced visibilities through the day. Trees, power lines, and tent facilities will be susceptible to damage, and power outages are possible. .DAYS TWO THROUGH SEVEN...Sunday night through Saturday Both the snow and winds are expected to diminish on Sunday evening. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. However, snowfall reports are appreciated. NEZ065-066-078-088-089-121530- Seward-Lancaster-Saline-Jefferson-Gage- 816 PM CDT Sat Apr 11 2020 This Hazardous Weather Outlook is for portions of southeast Nebraska. .DAY ONE...Tonight and Sunday Isolated to scattered thunderstorms will be possible overnight. A few strong storms with hail and gusty winds will be possible. A high wind warning is in effect for Sunday. Rain is expected to change over to snow from north to south Sunday afternoon before diminishing during the evening. Accumulations of an inch or so are possible along the I-80 corridor with less than a half inch expected over far southeast Nebraska and southwest Iowa. Sunday will also be quite windy. North winds will increase to 30 to 40 mph with gusts to 50 to 60 mph. Trees, power lines, and tent facilities will be susceptible to damage, and power outages are possible. The snow combined with the winds could result in reduced visibilities on area roads. .DAYS TWO THROUGH SEVEN...Sunday night through Saturday Both the snow and winds are expected to diminish on Sunday evening. .SPOTTER INFORMATION STATEMENT... Spotter activation should not be needed. IAZ055-056-069-079-080-090-091-NEZ052-053-067-068-090>093-121530- Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-Page- Douglas-Sarpy-Cass-Otoe-Johnson-Nemaha-Pawnee-Richardson- 816 PM CDT Sat Apr 11 2020 This Hazardous Weather Outlook is for portions of southwest Iowa...east central Nebraska and southeast Nebraska. .DAY ONE...Tonight and Sunday Isolated to scattered thunderstorms will be possible overnight. A few strong storms with hail and gusty winds will be possible, mainly south of Interstate 80. A wind advisory is in effect for Sunday. Rain is expected to change over to snow from north to south Sunday afternoon before diminishing during the evening. Accumulations of an inch or so are possible along the I-80 corridor with less than a half inch expected over far southeast Nebraska and southwest Iowa. Sunday will also be quite windy. North winds will increase to 25 to 35 mph with gusts to 50 mph. Trees, power lines, and tent facilities will be susceptible to damage, and power outages are possible. The snow combined with the winds could result in reduced visibilities on area roads. .DAYS TWO THROUGH SEVEN...Sunday night through Saturday Both the snow and winds are expected to diminish on Sunday evening. .SPOTTER INFORMATION STATEMENT... Spotter activation should not be needed.
In the hours before
Special weather statement, Apr 12, 4:32 AM CDT, 44 minutes before
Special Weather Statement
National Weather Service Omaha/Valley Nebraska
432 AM CDT Sun Apr 12 2020
NEZ066-078-089-121015-
Gage NE-Lancaster NE-Saline NE-
432 AM CDT Sun Apr 12 2020
...SPECIAL WEATHER STATEMENT...
At 432 AM CDT, Doppler radar was tracking a strong thunderstorm over
Hallam, or 17 miles south of Lincoln, moving northeast at 35 mph.
Half inch hail will be possible with this storm.
Locations impacted include...
Lincoln, Hickman, Cortland, Clatonia, Hallam, Roca, Sprague,
Stagecoach State Recreation Area, Wagon Train State Recreation Area,
Olive Creek State Recreation Area and Bluestem State Recreation Area.
This includes Interstate 80 in Nebraska between mile markers 395 and
403.
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.
&&
LAT...LON 4051 9696 4092 9674 4082 9646 4075 9646
4042 9675
TIME...MOT...LOC 0932Z 208DEG 32KT 4057 9678
KERNLocal storm report, Apr 12, 5:08 AM CDT, 8 minutes before
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</html>Local storm report, Apr 12, 5:09 AM CDT, 7 minutes before
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</html>Local storm report, Apr 12, 5:10 AM CDT, 6 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 |
|---|---|---|---|---|
| Apr 12, 4:02 AM CDT | Freeze Warning | OAX | Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 4 more | 30 hr |
| Apr 12, 4:32 AM CDT | Special Weather Statement | OAX | Lancaster | 43 min |
| Apr 12, 4:46 AM CDT | Severe Thunderstorm Warning | OAX | Cass, Lancaster | 44 min |
| Apr 12, 5:44 AM CDT | Severe Thunderstorm Warning | OAX | Douglas, Sarpy, Saunders | 19 min |
| Apr 12, 6:33 AM CDT | Special Weather Statement | OAX | Burt | 27 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2020Every severe thunderstorm warning in 2020
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.