Alert archive / Arkansas / Mesoscale Discussions in 2004

Mesoscale Discussion 993

May 30, 200410 counties in Arkansas; 5 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 30, 2004, 12:15 PM CDT for 10 counties in Arkansas; 5 counties in Oklahoma; 4 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 30, 2004, 12:15 PM CDT (17:15 UTC)
Expired: May 30, 2004, 1:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Clark County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Little River County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Fannin County, TX, Lamar County, TX, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 155 km from the middle of the area, began a volume at 17:15 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 333May 30, 12:35 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 5.3 hours before the alert went out and 168 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: 2146 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 631 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 376 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 15.2

Open this sounding in Storm Lab

The text

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

835 
ACUS11 KWNS 301716
SWOMCD
SPC MCD 301715 
ARZ000-TXZ000-OKZ000-301845-

MESOSCALE DISCUSSION 0993
NWS STORM PREDICTION CENTER NORMAN OK
1215 PM CDT SUN MAY 30 2004

AREAS AFFECTED...SERN OK...EXTREME NERN TX...SWRN AR

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 301715Z - 301845Z

STORMS WILL CONTINUE TO FORM OVER SERN OK...SWRN AR...POSSIBLY
EXTREME NERN TX OVER THE NEXT FEW HOURS.  A WW WILL LIKELY BE
REQUIRED TO COVER REMAINDER OF AREA.

CAP IS ERODING OVER THE AREA WITH COOLING ALOFT.  AIR MASS IS
BECOMING EXTREMELY UNSTABLE WITH MLCAPES EXPECTED TO REACH 3500-4000
J/KG.  VERY HIGH BOUNDARY LAYER DEWPOINTS IN THE MID 70S AND STRONG
0-1 SRH VALUES AROUND 300 M2/S2 INDICATE POTENTIAL FOR TORNADOES.

..JEWELL.. 05/30/2004

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

ATTN...WFO...LZK...SHV...TSA...FWD...OUN...

33409410 33419677 34559612 34569367 34579273 33389308

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 9:40 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	3 hr
May 30, 10:50 AM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Conway, Crawford and 14 more	8 hr
May 30, 12:35 PM CDT	Tornado Watch	SPC	Clark, Hempstead, Hot Spring, Howard, Lafayette, Little River and 3 more	6 hr
May 30, 12:53 PM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Madison, Washington	2 hr
May 30, 2:44 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Clark, Clay, Cleburne and 44 more	2 hr
May 30, 3:20 PM CDT	Tornado Watch	SPC	Arkansas, Calhoun, Clay, Cleburne, Cleveland, Craighead and 31 more	8 hr
May 30, 5:10 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 59 more	95 min
May 30, 5:53 PM CDT	Mesoscale Discussion	SPC	Conway, Crawford, Franklin, Garland, Hempstead, Howard and 13 more	97 min
May 30, 6:10 PM CDT	Tornado Watch	SPC	Baxter, Boone, Carroll, Clark, Cleburne, Conway and 30 more	5 hr
May 29, 8:27 PM CDT	Mesoscale Discussion	SPC	Canadian, Creek, Garfield, Grant, Kay, Kingfisher and 9 more	63 min
May 29, 9:45 PM CDT	Tornado Watch	SPC	Alfalfa, Blaine, Canadian, Craig, Creek, Custer and 22 more	6 hr
May 29, 11:23 PM CDT	Mesoscale Discussion	SPC	Craig, Kay, Mayes, Noble, Nowata, Osage and 5 more	67 min
May 30, 7:24 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Burnet, Coleman, Comanche, Coryell and 13 more	96 min

Nearby

Mesoscale Discussions in Arkansas, 2004 Mesoscale Discussions in Oklahoma, 2004 Mesoscale Discussions in Texas, 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.