Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 63, NWS Omaha, NE

May 29, 20184 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at May 29, 2018, 9:21 PM CDT for 4 counties in Nebraska. It was in force for 39 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: May 29, 2018, 9:21 PM CDT (02:21 UTC)
Expired: May 29, 2018, 10:00 PM CDT
In force: 39 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Gage County, NE, Jefferson County, NE, Lancaster County, NE, Saline County, NE

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 02:25 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
May 29, 2:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.4 hours before the alert went out and 108 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: 2 J/kg
Mixed-layer CIN: -210 J/kg
Mixed-layer LCL: 1413 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 May 29, 3:02 PM CDT, 6 hours 19 minutes earlier.

Area forecast discussion, May 29, 3:02 PM CDT, 6 hours 19 minutes before

Area Forecast Discussion
National Weather Service Omaha/Valley NE
302 PM CDT Tue May 29 2018

.SHORT TERM...(Tonight through Friday)
Issued at 300 PM CDT Tue May 29 2018

Convection ongoing at the start of the period this afternoon as
first in a series of short waves lifts across the area in advance
of strong upper trough over the western high plains.

Additional storms are likely into the late night hours as this
system works its way across the region with storms ending by
morning in eastern parts of the area as the main trough shifts to
the east. Once this system is east of the area hot temperatures
return for a short time as upper ridging moves back over the
central plains for Thursday and Friday.

.LONG TERM...(Friday night through Tuesday)
Issued at 300 PM CDT Tue May 29 2018

Stormy conditions return to the region Friday night into Saturday
as another strong upper trough sweeps across the northern and
central plains. A strong cold front will accompany the upper
system and bring more seasonal temperatures to the area through
Monday before ridging again builds back for the middle of next
week with another round of mid summer temperatures for the area.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday morning)
Issued at 102 PM CDT Tue May 29 2018

Showers and thunderstorms expected periodically this afternoon and
tonight. Kept conditions VFR outside of thunderstorms and
mentioned gusty winds...otherwise southeast through southwest
winds 5 to 15kts.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.
&&

SHORT TERM...Fobert
LONG TERM...Fobert
AVIATION...Zapotocny

Hazardous weather outlook, May 29, 3:50 PM CDT, 5 hours 31 minutes before

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In the hours before

Local storm report, May 29, 4:59 PM CDT, 4 hours 22 minutes before

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Local storm report, May 29, 5:40 PM CDT, 3 hours 41 minutes before

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Special weather statement, May 29, 5:44 PM CDT, 3 hours 37 minutes before

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Local storm report, May 29, 5:47 PM CDT, 3 hours 34 minutes before

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Local storm report, May 29, 5:57 PM CDT, 3 hours 24 minutes before

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Local storm report, May 29, 5:58 PM CDT, 3 hours 23 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
May 29, 8:32 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson	58 min
May 29, 9:11 PM CDT	Special Weather Statement	OAX	Saline	19 min
May 29, 10:02 PM CDT	Special Weather Statement	OAX	Gage	28 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2018 Every 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.