Alert archive / Nebraska / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 225, NWS Omaha, NE

September 10, 2015Jefferson County, Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Sep 10, 2015, 1:04 AM CDT for Jefferson County, Nebraska. It was in force for 26 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
Sep 10, 2015, 1:04 AM CDT (06:04 UTC)
Expired
Sep 10, 2015, 1:30 AM CDT
In force
26 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Jefferson County, NE

The radar

The Grand Island radar (KUEX), 111 km from the middle of the area, began a volume at 06:05 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, 6.1 hours before the alert went out and 143 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 2015-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 675 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 2015-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
675 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
1306 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
74 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 8:18 PM CDTSpecial Weather StatementOAXSeward42 min
Sep 9, 8:59 PM CDTSpecial Weather StatementOAXSeward46 min
Sep 9, 9:52 PM CDTSpecial Weather StatementOAXSaline38 min
Sep 9, 10:43 PM CDTSpecial Weather StatementOAXSaline47 min
Sep 9, 11:18 PM CDTSpecial Weather StatementOAXSaline42 min
Sep 9, 11:57 PM CDTSpecial Weather StatementOAXGage48 min
Sep 10, 12:44 AM CDTSpecial Weather StatementOAXGage, Pawnee46 min
Sep 10, 1:08 AM CDTSpecial Weather StatementOAXPawnee52 min
Sep 10, 1:27 AM CDTSevere Thunderstorm WarningOAXGage, Pawnee33 min
Sep 10, 1:55 AM CDTSpecial Weather StatementOAXPawnee35 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2015Every severe thunderstorm warning in 2015

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.