Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 159, NWS Omaha, NE

August 10, 20206 counties in Nebraska; Harrison County, Mills County, Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Aug 10, 2020, 8:53 AM CDT for 6 counties in Nebraska; Harrison County, Mills County, Pottawattamie County, Iowa. It was in force for 37 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
Aug 10, 2020, 8:53 AM CDT (13:53 UTC)
Expired
Aug 10, 2020, 9:30 AM CDT
In force
37 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Harrison County, IA, Mills County, IA, Pottawattamie County, IA, Cass County, NE, Douglas County, NE, Lancaster County, NE, Sarpy County, NE, Saunders County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 25 km from the middle of the area, began a volume at 13:56 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, 1.9 hours before the alert went out and 25 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2020-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2619 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2020-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2619 J/kg
Mixed-layer CIN
-283 J/kg
Mixed-layer LCL
1590 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
100 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 Aug 10, 6:35 AM CDT, 2 hours 18 minutes earlier.

Area forecast discussion, Aug 10, 6:35 AM CDT, 2 hours 18 minutes before
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Hazardous weather outlook, Aug 10, 4:34 AM CDT, 4 hours 19 minutes before
Hazardous Weather Outlook
National Weather Service Omaha/Valley NE
434 AM CDT Mon Aug 10 2020

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-102345-
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-
434 AM CDT Mon Aug 10 2020

This Hazardous Weather Outlook is for portions of southwest
Iowa...west central Iowa...east central Nebraska...northeast
Nebraska and southeast Nebraska.

.DAY ONE...Today and Tonight

Isolated showers and storms are possible this morning and today
as a cold front continues to move southeast through the area. The
front is expected to reach far southeast Nebraska by 7pm and may
stall out after the it crosses into northeast Kansas/northwest
Missouri. While an isolated storm or two may become severe,
widespread severe activity is not expected at this time. The best
chance for any severe activity will be in far southeast Nebraska,
extending into KS/MO.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Periodic showers and storms continue to be possible into this
weekend. Severe storm potential is uncertain at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Aug 10, 6:51 AM CDT, 2 hours 2 minutes before
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Special weather statement, Aug 10, 8:03 AM CDT, 50 minutes before
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Special weather statement, Aug 10, 8:30 AM CDT, 23 minutes before
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Special weather statement, Aug 10, 8:42 AM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 5:55 AM CDTSevere Thunderstorm WarningOAXKnox50 min
Aug 10, 6:38 AM CDTSevere Thunderstorm WarningOAXCedar, Knox52 min
Aug 10, 6:57 AM CDTSevere Thunderstorm WarningOAXCedar48 min
Aug 10, 8:03 AM CDTSpecial Weather StatementOAXThurston27 min
Aug 10, 8:30 AM CDTSpecial Weather StatementOAXBurt45 min
Aug 10, 8:42 AM CDTSpecial Weather StatementOAXDouglas, Saunders, Washington33 min
Aug 10, 8:46 AM CDTSevere Thunderstorm WarningOAXBurt, Washington29 min
Aug 10, 9:15 AM CDTSpecial Weather StatementOAXOtoe45 min
Aug 10, 9:25 AM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe50 min
Aug 10, 9:09 AM CDTSevere Thunderstorm WarningOAXPottawattamie, Shelby51 min
Aug 10, 10:06 AM CDTSpecial Weather StatementOAXPage24 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2020Severe Thunderstorm Warnings in Iowa, 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.