Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 461

April 23, 20045 counties in Oklahoma; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2004, 11:08 PM CDT for 5 counties in Oklahoma; 15 counties in Texas. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2004, 11:08 PM CDT (04:08 UTC)
Expired: Apr 23, 2004, 11:45 PM CDT
In force: 37 min
Issued by: the Storm Prediction Center

Counties Carter County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hood County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Stephens County, TX, Wise County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 4.1 hours before the alert went out and 103 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: 1475 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 895 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

944 
ACUS11 KWNS 240409
SWOMCD
SPC MCD 240408 
OKZ000-TXZ000-240445-

MESOSCALE DISCUSSION 0461
NWS STORM PREDICTION CENTER NORMAN OK
1108 PM CDT FRI APR 23 2004

AREAS AFFECTED...CENTRAL AND WINN TX

CONCERNING...SEVERE THUNDERSTORM WATCH 113...

VALID 240408Z - 240445Z

HAIL/WIND THREAT IS SLOWLY DIMINISHING ACROSS NRN AND WRN TX AND
ANOTHER WW ISSUANCE IS UNLIKELY.

SQUALL LINE FROM NEAR ADM TO WEST OF FTW TO NEAR SJT IS MOVING EWD
AT 20 KT THROUGH SRN OK/NRN TX AND 10 KT ON THE SRN OF THE LINE. THE
SLOW MOTION OF THE LINE IS REDUCING THE THREAT OF WIND DAMAGE AND
THE GRADUAL COOLING OF THE BOUNDARY LAYER IS REDUCING THE AMOUNT OF
INSTABILITY AVAILABLE FOR SEVERE HAIL. THE DEEPENING MERIDIONAL SLY
FLOW SUGGESTS THAT HEAVY RAINFALL IS BECOMING THE BIGGEST SEVERE
WEATHER HAZARD. AS SUCH...WW 113 WILL EXPIRE AS SCHEDULED AT 05Z.

..IMY.. 04/24/2004

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

ATTN...WFO...FWD...OUN...SJT...

31480083 32539938 33309801 34509724 34589619 34079634
32189804 31379870

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 7:05 PM CDT	Mesoscale Discussion	SPC	Adair, Alfalfa, Atoka, Blaine, Caddo, Canadian and 46 more	25 min
Apr 23, 7:35 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 40 more	6 hr
Apr 23, 7:48 PM CDT	Mesoscale Discussion	SPC	Carter, Cotton, Jefferson, Johnston, Love, Marshall and 3 more	87 min
Apr 23, 7:56 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Cherokee, Coal, Haskell, Johnston and 4 more	2 hr
Apr 23, 9:18 PM CDT	Mesoscale Discussion	SPC	Carter, Coal, Jefferson, Johnston, Love, Marshall and 2 more	57 min
Apr 23, 9:43 PM CDT	Mesoscale Discussion	SPC	Adair, Caddo, Canadian, Cherokee, Cleveland, Coal and 38 more	62 min
Apr 23, 11:33 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Delaware, Haskell, Hughes, Latimer and 12 more	57 min
Apr 24, 1:40 AM CDT	Severe Thunderstorm Watch	SPC	LeFlore, McCurtain, Sequoyah	4 hr
Apr 24, 12:28 AM CDT	Mesoscale Discussion	SPC	Atascosa, Austin, Bastrop, Bee, Bexar, Burleson and 25 more	92 min
Apr 24, 12:50 AM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Austin, Bastrop, Bee, Caldwell and 27 more	5 hr
Apr 24, 3:00 AM CDT	Mesoscale Discussion	SPC	Aransas, Austin, Brazoria, Calhoun, Chambers, Colorado and 18 more	60 min
Apr 24, 3:45 AM CDT	Severe Thunderstorm Watch	SPC	Austin, Brazoria, Calhoun, Chambers, Colorado, Fayette and 21 more	5 hr

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.