Alert archive / Nebraska / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 16, NWS Hastings, NE

April 30, 2009Harlan County, Phelps County, Nebraska

NWS Hastings, NE issued this severe thunderstorm warning at Apr 30, 2009, 3:50 AM CDT for Harlan County, Phelps County, Nebraska. It was in force for 40 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
Apr 30, 2009, 3:50 AM CDT (08:50 UTC)
Expired
Apr 30, 2009, 4:30 AM CDT
In force
40 min
Issued by
NWS Hastings, NE
Area
Storm-based polygon

Counties Harlan County, NE, Phelps County, NE

The radar

The Grand Island radar (KUEX), 82 km from the middle of the area, began a volume at 08:53 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
Apr 30, 1:36 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 8.8 hours before the alert went out and 133 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, N. Platte/Lee Bi, NE at 00:00Z on 2009-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2422 joules per kilogram.LCLEL10008507005003002001001 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, N. Platte/Lee Bi, NE at 00:00Z on 2009-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -26 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
2422 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1313 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-26 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.8

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 3:07 AM CDTSpecial Weather StatementGIDFurnas, Gosper23 min
Apr 30, 3:37 AM CDTSpecial Weather StatementGIDPhelps23 min
Apr 30, 3:54 AM CDTSpecial Weather StatementGIDFurnas36 min
Apr 30, 4:07 AM CDTSpecial Weather StatementGIDFurnas38 min
Apr 30, 4:31 AM CDTSpecial Weather StatementGIDKearney29 min
Apr 30, 4:41 AM CDTSpecial Weather StatementGIDFranklin34 min
Apr 30, 4:59 AM CDTSpecial Weather StatementGIDFranklin, Kearney31 min
Apr 30, 5:28 AM CDTSpecial Weather StatementGIDWebster32 min
Apr 30, 5:56 AM CDTSpecial Weather StatementGIDNuckolls, Webster34 min
Apr 30, 4:53 AM CDTSpecial Weather StatementGIDPhillips37 min
Apr 30, 6:30 AM CDTSpecial Weather StatementGIDJewell, Mitchell30 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2009Every severe thunderstorm warning in 2009

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.