Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 482

April 25, 200411 counties in Oklahoma; 29 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2004, 7:22 PM CDT for 11 counties in Oklahoma; 29 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2004, 7:22 PM CDT (00:22 UTC)
Expired: Apr 25, 2004, 8:15 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center

All 40 counties

Beckham County, OK, Comanche County, OK, Cotton County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Love County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Briscoe County, TX, Childress County, TX, Clay County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Jack County, TX, King County, TX, Knox County, TX, Montague County, TX, Motley County, TX, Palo Pinto County, TX, Stephens County, TX, Throckmorton County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 46 km from the middle of the area, began a volume at 00:24 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, 0.4 hours before the alert went out and 217 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 204 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1535 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

209 
ACUS11 KWNS 260022
SWOMCD
SPC MCD 260022 
TXZ000-OKZ000-260115-

MESOSCALE DISCUSSION 0482
NWS STORM PREDICTION CENTER NORMAN OK
0722 PM CDT SUN APR 25 2004

AREAS AFFECTED...NWRN TX/SRN OK

CONCERNING...SEVERE THUNDERSTORM WATCH 121...

VALID 260022Z - 260115Z

A NEW SEVERE TSTM WATCH IS BEING CONSIDERED ACROSS PARTS OF THE SERN
TX PNHDL...SRN OK...AND NWRN TX. STORMS TRENDS OVER THE NEXT HOUR
WILL BE MONITORED CLOSELY.

ARC OF STRONG TO SEVERE STORMS FROM 35N FSI TO 30NW SPS TO 50SSE CDS
CONTINUES MOVING TO THE SE AT ABOUT 30KT AND WILL BEGIN TO MOVE OUT
OF THE SERN PORTION OF WW 121 OVER THE NEXT HOUR. DOWNSTREAM AIRMASS
IS NOT PARTICULARLY UNSTABLE AND WILL CONTINUE TO DIABATICALLY COOL
AND STABILIZE WITH THE LOSS OF INSOLATION. NONETHELESS...THERE IS
STRONG MESOSCALE AND STORM SCALE ORGANIZATION TO THE ONGOING
COMPLEX. LOW LEVEL ELY INFLOW AND PERPENDICULAR ORIENTATION OF SOME
OF THE LINE SEGMENTS TO MODEST MID LEVEL FLOW SUGGEST THAT A SMALL
WIND DAMAGE THREAT MAY PERSIST WITH THE STRONGER CELLS MOVING ALONG
THE RED RIVER OVER THE NEXT COUPLE HOURS. IN ADDITION...SMALLER
UPSTREAM CLUSTER OF SEVERE STORMS CLOSELY TIED TO MID LEVEL COLD
POOL...NOW ABOUT 30E AMA...WAS TRACKING SE ABOUT 40KT AND SHOULD
POSE A THREAT OF HAIL AND DAMAGING WINDS FOR AWHILE LONGER AS IT
TRACKS INTO THE SERN TX PNHDL. THUS...A REPLACEMENT WATCH
ENCOMPASSING BOTH THESE COMPLEXES MAY BE NEEDED SHORTLY.

..CARBIN.. 04/26/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FWD...OUN...SJT...LUB...AMA...

32599818 32759897 33159996 33520125 34250183 34960113
35540093 35409992 35169902 34939846 34789801 34079710
33149744

Nearby

Mesoscale Discussions in Texas, 2004 Mesoscale Discussions in Oklahoma, 2004 Every mesoscale discussion 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.