Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 256, NWS Omaha, NE

October 6, 2017Lancaster County, Saline County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Oct 6, 2017, 7:56 PM CDT for Lancaster County, Saline County, Nebraska. It was in force for 34 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
Oct 6, 2017, 7:56 PM CDT (00:56 UTC)
Expired
Oct 6, 2017, 8:30 PM CDT
In force
34 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

Counties Lancaster County, NE, Saline County, NE

The radar

The Omaha radar (KOAX), 87 km from the middle of the area, began a volume at 01:00 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.

IssuedProductOfficeLasted
Oct 6, 3:47 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.9 hours before the alert went out and 87 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 2017-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2017-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
374 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 6, 7:28 PM CDTSpecial Weather StatementOAXSaline32 min
Oct 6, 7:35 PM CDTSevere Thunderstorm WarningOAXLancaster, Saline, Seward25 min
Oct 6, 8:22 PM CDTRiver Flood WarningOAXPierce4 days
Oct 6, 8:50 PM CDTSpecial Weather StatementOAXJefferson25 min
Oct 6, 9:21 PM CDTAreal Flood AdvisoryOAXLancaster3 hr
Oct 6, 9:41 PM CDTSpecial Weather StatementOAXPawnee34 min
Oct 6, 10:15 PM CDTSpecial Weather StatementOAXNemaha, Richardson45 min
Oct 6, 10:45 PM CDTSpecial Weather StatementOAXPawnee, Richardson45 min
Oct 7, 8:08 AM CDTRiver Flood WarningOAXSaunders32 hr
Oct 7, 8:21 AM CDTAreal Flood AdvisoryOAXGage, Pawnee12 hr
Oct 7, 9:59 AM CDTRiver Flood WarningOAXOtoe3 days
Oct 7, 10:04 AM CDTRiver Flood WarningOAXSaunders24 hr
Oct 7, 11:52 AM CDTAreal Flood AdvisoryOAXSaunders8 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2017Every severe thunderstorm warning in 2017

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.