Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 222, NWS Omaha, NE

July 4, 2018Boone County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Jul 4, 2018, 11:47 PM CDT for Boone County, Nebraska. It was in force for 43 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, 11:47 PM CDT (04:47 UTC)
Expired
Jul 5, 2018, 12:30 AM CDT
In force
43 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Boone County, NE

The radar

The Omaha radar (KOAX), 148 km from the middle of the area, began a volume at 04:50 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, 4.8 hours before the alert went out and 148 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 00:00Z on 2018-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3193 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 00:00Z on 2018-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.1939Sfc1 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
3193 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1288 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.4
Supercell composite
4.5

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 Jul 4, 11:44 PM CDT, 3 minutes earlier.

Area forecast discussion, Jul 4, 11:44 PM CDT, 3 minutes before
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Hazardous weather outlook, Jul 4, 4:21 PM CDT, 7 hours 26 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

Local storm report, Jul 4, 10:30 PM CDT, 1 hour 17 minutes before
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Special weather statement, Jul 4, 10:31 PM CDT, 1 hour 16 minutes before
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Local storm report, Jul 4, 10:36 PM CDT, 1 hour 11 minutes before
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Special weather statement, Jul 4, 11:04 PM CDT, 43 minutes before
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Special weather statement, Jul 4, 11:08 PM CDT, 39 minutes before
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Local storm report, Jul 4, 11:09 PM CDT, 38 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 7:31 PM CDTSpecial Weather StatementOAXBoone, Madison, Stanton, Thurston, Wayne44 min
Jul 4, 8:06 PM CDTSpecial Weather StatementOAXBurt, Cuming24 min
Jul 4, 8:26 PM CDTSpecial Weather StatementOAXButler, Dodge, Douglas, Saunders, Seward, Washington49 min
Jul 4, 8:32 PM CDTSpecial Weather StatementOAXBurt, Colfax, Dodge28 min
Jul 4, 8:49 PM CDTSpecial Weather StatementOAXBoone41 min
Jul 4, 8:55 PM CDTSpecial Weather StatementOAXBurt35 min
Jul 4, 9:04 PM CDTSpecial Weather StatementOAXDouglas, Saunders, Washington56 min
Jul 4, 9:10 PM CDTSevere Thunderstorm WarningOAXBurt, Dodge, Douglas, Saunders, Washington50 min
Jul 4, 9:18 PM CDTSevere Thunderstorm WarningOAXAntelope, Boone42 min
Jul 4, 9:23 PM CDTSpecial Weather StatementOAXCass, Sarpy37 min
Jul 4, 9:30 PM CDTSevere Thunderstorm WarningOAXAntelope, Boone45 min
Jul 4, 9:45 PM CDTSevere Thunderstorm WarningOAXDouglas, Sarpy, Washington45 min
Jul 4, 10:03 PM CDTSpecial Weather StatementOAXCass, Lancaster, Sarpy42 min
Jul 4, 10:16 PM CDTSpecial Weather StatementOAXBoone29 min
Jul 4, 11:08 PM CDTSpecial Weather StatementOAXCass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 2 more52 min
Jul 5, 12:22 AM CDTSpecial Weather StatementOAXPlatte38 min
Jul 5, 1:02 AM CDTSpecial Weather StatementOAXPlatte28 min
Jul 5, 1:14 AM CDTSpecial Weather StatementOAXButler31 min
Jul 4, 9:12 PM CDTSpecial Weather StatementOAXCrawford48 min
Jul 4, 9:59 PM CDTSevere Thunderstorm WarningOAXHarrison, Pottawattamie, Shelby47 min
Jul 4, 10:31 PM CDTSpecial Weather StatementOAXMills, Montgomery, Pottawattamie29 min
Jul 4, 11:04 PM CDTSpecial Weather StatementOAXFremont, Mills, Montgomery, Page56 min

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.