Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 21, NWS Norman, OK

March 20, 2004Bryan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 20, 2004, 5:38 PM CST for Bryan County, Oklahoma. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 20, 2004, 5:38 PM CST (23:38 UTC)
Expired
Mar 20, 2004, 6:00 PM CST
In force
22 min
Issued by
NWS Norman, OK
Area
Counties, with a storm outline in the text

County Bryan County, OK

The radar

The Norman radar (KTLX), 170 km from the middle of the area, began a volume at 23:41 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, 11.6 hours before the alert went out and 166 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 2004-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2012 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 12:00Z on 2004-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 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
2012 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
322 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

818 
WUUS54 KOUN 202338
SVROKC
OKC013-210000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
536 PM CST SAT MAR 20 2004

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BRYAN COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 600 PM CST

* AT 536 PM CST...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM OVER
  KENEFIC...MOVING SOUTH AT 20 MPH. ADDITIONAL STORMS THAT MAY
  BECOME SEVERE WERE NEAR CANEY AND NORTHERN LAKE TEXOMA.

* LOCATIONS IN THE WARNING INCLUDE ARMSTRONG...BENNINGTON...BLUE...
  BOKCHITO...CADDO...CALERA...DURANT...KENEFIC...MEAD...SILO AND
  UTICA

HAIL UP TO THE SIZE OF QUARTERS IS LIKELY.

LAT...LON 3418 9612 3418 9646 3394 9659 3388 9627
          3399 9597

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 20, 5:04 PM CSTSevere Thunderstorm WarningOUNAtoka41 min
Mar 20, 5:57 PM CSTSevere Thunderstorm WarningOUNBryan33 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2004Every severe thunderstorm warning in 2004

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.