Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 470, NWS Norman, OK

July 2, 2020Jefferson County, Oklahoma; Clay County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jul 2, 2020, 7:05 PM CDT for Jefferson County, Oklahoma; Clay County, Texas. It was in force for 55 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
Jul 2, 2020, 7:05 PM CDT (00:05 UTC)
Expired
Jul 2, 2020, 8:00 PM CDT
In force
55 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

Counties Jefferson County, OK, Clay County, TX

The radar

The Altus AFB radar (KFDR), 99 km from the middle of the area, began a volume at 00:08 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 00:00Z, 0.1 hours before the alert went out and 152 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 00:00Z on 2020-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 361 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, Norman, OK at 00:00Z on 2020-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
361 J/kg
Mixed-layer CIN
-242 J/kg
Mixed-layer LCL
1970 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
116 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
Jul 2, 11:24 PM CDTSpecial Weather StatementOUNHarper51 min
Jul 3, 1:45 AM CDTSpecial Weather StatementOUNAlfalfa, Grant, Kay45 min
Jul 3, 11:34 AM CDTSpecial Weather StatementOUNGarfield26 min
Jul 3, 11:49 AM CDTSpecial Weather StatementOUNNoble26 min
Jul 3, 1:11 PM CDTSpecial Weather StatementOUNKay19 min
Jul 3, 1:58 PM CDTSpecial Weather StatementOUNLincoln32 min
Jul 3, 2:38 PM CDTSpecial Weather StatementOUNLincoln37 min
Jul 3, 3:10 PM CDTSpecial Weather StatementOUNPottawatomie35 min
Jul 3, 3:19 PM CDTSpecial Weather StatementOUNHughes41 min
Jul 3, 3:27 PM CDTSpecial Weather StatementOUNSeminole48 min
Jul 3, 4:44 PM CDTSpecial Weather StatementOUNHughes31 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020Severe Thunderstorm Warnings in Texas, 2020Every severe thunderstorm warning in 2020

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.