Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 17, NWS Omaha, NE

April 12, 2020Douglas County, Sarpy County, Saunders County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Apr 12, 2020, 5:44 AM CDT for Douglas County, Sarpy County, Saunders County, Nebraska. It was in force for 19 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, 5:44 AM CDT (10:44 UTC)
Expired: Apr 12, 2020, 6:03 AM CDT
In force: 19 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Douglas County, NE, Sarpy County, NE, Saunders County, NE

The radar

The Omaha radar (KOAX), 13 km from the middle of the area, began a volume at 10:47 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, 10.7 hours before the alert went out and 13 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: 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

Open this sounding in Storm Lab

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, 46 minutes earlier.

Area forecast discussion, Apr 12, 4:58 AM CDT, 46 minutes before

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Hazardous weather outlook, Apr 12, 5:25 AM CDT, 19 minutes before

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In the hours before

Local storm report, Apr 12, 5:09 AM CDT, 35 minutes before

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Local storm report, Apr 12, 5:10 AM CDT, 34 minutes before

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Local storm report, Apr 12, 5:20 AM CDT, 24 minutes before

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Local storm report, Apr 12, 5:40 AM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
540 AM CDT SUN APR 12 2020

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

0450 AM     HAIL             5 N WAVERLY             40.99N 96.53W
04/12/2020  M1.50 INCH       LANCASTER          NE   TRAINED SPOTTER

&&

Local storm report, Apr 12, 5:43 AM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
543 AM CDT SUN APR 12 2020

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

0512 AM     HAIL             1 E LINCOLN             40.82N 96.67W
04/12/2020  M1.25 INCH       LANCASTER          NE   TRAINED SPOTTER

&&

Local storm report, Apr 12, 5:44 AM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
544 AM CDT SUN APR 12 2020

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

0502 AM     HAIL             4 SE LINCOLN            40.77N 96.64W
04/12/2020  E1.00 INCH       LANCASTER          NE   PUBLIC

            REPORT FROM MPING: QUARTER (1.00 IN.).

&&

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, 5:16 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Saunders	29 min
Apr 12, 6:33 AM CDT	Special Weather Statement	OAX	Burt	27 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2020 Every 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.