Alert archive / Oklahoma / Freeze Warnings in 2007

Freeze Warning 1, NWS Norman, OK

April 4, 20075 counties in Oklahoma

NWS Norman, OK issued this freeze warning at Apr 4, 2007, 11:58 AM CDT for 5 counties in Oklahoma. It took effect at Apr 4, 2007, 10:00 PM CDT. It was in force for 11 hr. 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 4, 2007, 11:58 AM CDT (16:58 UTC)
In effect from
Apr 4, 2007, 10:00 PM CDT
Expired
Apr 5, 2007, 9:00 AM CDT
In force
11 hr
Issued by
NWS Norman, OK

Counties Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK, Payne County, OK

The radar

The Vance AFB radar (KVNX), 72 km from the middle of the area, began a volume at 16:56 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

Norman, OK (KOUN), launched 12:00Z, 5.0 hours before the alert went out and 141 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, Norman, OK at 12:00Z on 2007-04-04Temperature 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, Norman, OK at 12:00Z on 2007-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -102 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2082 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-102 m²/s²
0-3 km storm-relative helicity
192 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 11:58 AM CDTFrost AdvisoryOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 17 more21 hr

Nearby

Freeze Warnings in Oklahoma, 2007Every freeze warning in 2007

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.