Alert archive / Nebraska / Tornado Warnings in 2022

Tornado Warning 12, NWS Omaha, NE

April 12, 2022Nemaha County, Otoe County, Nebraska

NWS Omaha, NE issued this tornado warning at Apr 12, 2022, 9:38 PM CDT for Nemaha County, Otoe County, Nebraska. It was in force for 22 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, 2022, 9:38 PM CDT (02:38 UTC)
Expired: Apr 12, 2022, 10:00 PM CDT
In force: 22 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Nemaha County, NE, Otoe County, NE

The radar

The Omaha radar (KOAX), 95 km from the middle of the area, began a volume at 02:39 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 12, 6:46 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.6 hours before the alert went out and 95 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1368 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 2687 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Apr 12, 6:28 PM CDT, 3 hours 10 minutes earlier.

Area forecast discussion, Apr 12, 6:28 PM CDT, 3 hours 10 minutes before

Area Forecast Discussion
National Weather Service Omaha/Valley NE
628 PM CDT Tue Apr 12 2022

...Updated Aviation Forecast Discussion...

.DISCUSSION...
Issued at 331 PM CDT Tue Apr 12 2022

Water vapor imagery was showing a deep trof crossing the northern
Rockies approaching the western Dakotas. Surface reflection has
deepened significantly since yesterday and is currently centered
over south-central SD with an associated warm front extending into
southeast SD and southwest MN. Another attendant warm front extended
into north-central NE to about northwest MO. Daytime heating and
moisture advection has allowed the environment to become quite
unstable behind the southern boundary with MLCAPE around 3000
J/kg over eastern KS and moderate instability nosing up through
the CWA.

Timing and placement of storm initiation is somewhat uncertain.
At this point the short term models have been progressively
pushing the warm front northward as the surface low lifts to the
northeast. As of now it appears the aforementioned southern
boundary should be straddling the SD/NE by late this afternoon
and be the focus for storm initiation. As of now, the latest HRRR
is pointing toward extreme southeast SD for initiation in vicinity
of the triple point, but depending on boundary position cannot
rule out some cell initiation somewhere over extreme northeast NE.

The bottom line is that combination of instability, strengthening
low level jet, significant deep layer and low level environmental
shear will be quite supportive for discrete storm formation early
on. There is a distinct possibility for tornadic supercells as
well as effective shear pushes 50kt along with ESRH values 200-300
m2/s2. And with very steep mid layer lapse rates atop increasing
low level moisture large hail will likely accompany a few storms.

Early this evening, storm mode will shift in response to a cold
front moving through the CWA. As the front pushes south, low level
convergence along the boundary will allow storms to transition to
linear mode/QLCS with the primary threat becoming straight line
winds generally south of the I-80 corridor. Storm activity should
be coming to an end after midnight.

On Wednesday, subsidence behind the exiting cold front will equate
to dry but windy conditions. Heading into this weekend then zonal
flow aloft with no major disturbances migrating through will equate
to dry conditions.

Sunday through Monday morning upper impulses will aid with
possible precip. As a matter of fact, there is a chance that there
may be a mix of rain and snow Sunday night.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 608 PM CDT Tue Apr 12 2022

Main concern is the potential for a line of thunderstorms to move
through KLNK and KOMA in the first few hours of the TAF cycle.
Winds could gust to severe limits with the passage of these
storms. In addition, low-level wind shear is expected in the first
few hours of the TAF period as well. Otherwise, northwest winds
behind an approching cold front are expected to gust to near 30kt
through the overnight hours associated with the exiting system.
VFR conditions are expected through the period with the exception
of in and around thunderstorms.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...Fire Weather Watch from Wednesday afternoon through Wednesday
     evening for NEZ011-012-015>018-030>034-042>045-050>052-065-
     066-078-088-089.

     Wind Advisory until 1 AM CDT Wednesday for NEZ011-012-015>018-
     030>034-042>045-050>053-065>068-078-088>093.

     Red Flag Warning until 9 PM CDT this evening for NEZ030-042-050-
     065-078-088.

IA...Fire Weather Watch from Wednesday afternoon through Wednesday
     evening for IAZ043-055.

     Wind Advisory until 1 AM CDT Wednesday for IAZ043-055-056-069-
     079-080-090-091.

&&

DISCUSSION...DEE
AVIATION...KERN

Hazardous weather outlook, Apr 12, 9:17 PM CDT, 21 minutes before

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In the hours before

Local storm report, Apr 12, 7:44 PM CDT, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
744 PM CDT TUE APR 12 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0736 PM     HAIL             1 S WAHOO               41.19N 96.62W
04/12/2022  U1.00 INCH       SAUNDERS           NE   PUBLIC

            REPORT FROM MPING.

&&

CA

Local storm report, Apr 12, 7:45 PM CDT, 1 hour 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
745 PM CDT TUE APR 12 2022

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0725 PM     HAIL             2 S WAHOO               41.19N 96.62W
04/12/2022  M1.00 INCH       SAUNDERS           NE   NWS EMPLOYEE

&&

CA

Local storm report, Apr 12, 9:06 PM CDT, 32 minutes before

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Local storm report, Apr 12, 9:13 PM CDT, 25 minutes before

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Local storm report, Apr 12, 9:14 PM CDT, 24 minutes before

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Local storm report, Apr 12, 9:28 PM CDT, 10 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 12, 7:00 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Lancaster, Saline, Seward	45 min
Apr 12, 7:02 PM CDT	Severe Thunderstorm Warning	OAX	Burt, Cuming, Thurston	43 min
Apr 12, 7:16 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson, Saline	44 min
Apr 12, 7:21 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Douglas, Lancaster, Otoe, Sarpy, Saunders and 1 more	39 min
Apr 12, 7:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Burt, Dodge, Saunders, Washington	52 min
Apr 12, 7:24 PM CDT	Tornado Warning	OAX	Lancaster	21 min
Apr 12, 7:40 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Lancaster, Otoe, Saline	50 min
Apr 12, 7:50 PM CDT	Tornado Warning	OAX	Douglas, Washington	10 min
Apr 12, 7:55 PM CDT	High Wind Warning	OAX	Antelope, Boone, Cedar, Colfax, Cuming, Knox and 6 more	2 hr
Apr 12, 7:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Douglas, Lancaster, Otoe, Sarpy, Saunders	50 min
Apr 12, 7:55 PM CDT	Wind Advisory	OAX	Antelope, Boone, Cedar, Colfax, Cuming, Knox and 6 more	9 hr
Apr 12, 7:57 PM CDT	Tornado Warning	OAX	Washington	18 min
Apr 12, 8:04 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Washington	56 min
Apr 12, 8:15 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson, Johnson, Lancaster, Otoe, Pawnee	45 min
Apr 12, 8:34 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Cass, Douglas, Otoe, Sarpy	56 min
Apr 12, 8:37 PM CDT	Tornado Warning	OAX	Sarpy	23 min
Apr 12, 8:43 PM CDT	Severe Thunderstorm Warning	OAX	Gage, Johnson, Nemaha, Otoe, Pawnee, Richardson	47 min
Apr 12, 9:25 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe	65 min
Apr 12, 9:28 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha, Otoe, Pawnee, Richardson	32 min
Apr 12, 9:56 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Johnson, Nemaha, Otoe, Pawnee, Richardson	49 min
Apr 12, 10:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Nemaha, Richardson	25 min
Apr 13, 3:33 AM CDT	Fire Weather Watch	OAX	Antelope, Boone, Burt, Butler, Cass, Cedar and 24 more	24 hr
Apr 13, 3:33 AM CDT	Red Flag Warning	OAX	Antelope, Boone, Burt, Butler, Cedar, Colfax and 16 more	17 hr
Apr 13, 10:58 AM CDT	Wind Advisory	OAX	Antelope, Boone, Cedar, Knox, Pierce	4 hr
Apr 13, 3:12 PM CDT	Wind Advisory	OAX	Antelope, Boone, Burt, Butler, Cass, Cedar and 17 more	28 hr
Apr 12, 8:15 PM CDT	Tornado Warning	OAX	Harrison, Shelby	15 min
Apr 12, 8:28 PM CDT	Tornado Warning Tornado observed	OAX	Harrison, Shelby	17 min
Apr 12, 8:46 PM CDT	Tornado Warning	OAX	Shelby	14 min
Apr 12, 8:53 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Harrison, Monona, Pottawattamie, Shelby	22 min
Apr 12, 9:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OAX	Pottawattamie, Shelby	28 min

Nearby

Tornado Warnings in Nebraska, 2022 Every tornado warning in 2022 Tornadoes in 2022

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.