Alert archive / Oklahoma / Winter Weather Advisories in 2021

Winter Weather Advisory 4, NWS Norman, OK

February 7, 20219 counties in Oklahoma

NWS Norman, OK issued this winter weather advisory at Feb 7, 2021, 12:50 PM CST for 9 counties in Oklahoma. It took effect at Feb 8, 2021, 4:00 AM CST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued
Feb 7, 2021, 12:50 PM CST (18:50 UTC)
In effect from
Feb 8, 2021, 4:00 AM CST
Expired
Feb 8, 2021, 6:00 PM CST
In force
14 hr
Issued by
NWS Norman, OK

Counties Beckham County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Greer County, OK, Kiowa County, OK, Oklahoma County, OK, Roger Mills County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 109 km from the middle of the area, began a volume at 18:54 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

Dodge City, (KDDC), launched 12:00Z, 6.8 hours before the alert went out and 287 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, Dodge City, at 12:00Z on 2021-02-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Dodge City, at 12:00Z on 2021-02-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 753 square meters per square second.1939587897117136Sfc1 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
101 kt
0-1 km storm-relative helicity
753 m²/s²
0-3 km storm-relative helicity
746 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
Feb 7, 7:48 AM CSTWinter Weather AdvisoryOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 30 more40 hr

Nearby

Winter Weather Advisories in Oklahoma, 2021Every winter weather advisory in 2021

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.