Alert archive / Arkansas / Mesoscale Discussions in 2003
Mesoscale Discussion 809
The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 11:08 PM CDT for 39 counties in Arkansas; Bowie County, Cass County, Texas. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2003, 11:08 PM CDT (04:08 UTC)
- Expired
- May 7, 2003, 12:45 AM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
All 41 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bowie County, TX, Cass County, TX
The radar
The Little Rock radar (KLZK), 68 km from the middle of the area, began a volume at 04:10 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.
The nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 4.1 hours before the alert went out and 234 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.
- Mixed-layer CAPE
- 2206 J/kg
- Mixed-layer CIN
- -215 J/kg
- Mixed-layer LCL
- 1131 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 303 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 11.5
The text
As transmitted, in the capitals the NWS used until 2016.
496 ACUS11 KWNS 070408 SWOMCD SPC MCD 070408 ARZ000-MSZ000-LAZ000-TXZ000-OKZ000-070545- MESOSCALE DISCUSSION 0809 NWS STORM PREDICTION CENTER NORMAN OK 1108 PM CDT TUE MAY 06 2003 AREAS AFFECTED...NE TX...SW/CNTRL AR...NW LA CONCERNING...TORNADO WATCH 277... VALID 070408Z - 070545Z THREAT FOR LARGE HAIL/DAMAGING WINDS APPEARS TO BE INCREASING AGAIN ACROSS ARKANSAS...NEW WW WILL BE ISSUED SHORTLY. NEW CONVECTIVE DEVELOPMENT EAST OF THE DALLAS/FORT WORTH AREA AND REINTENSIFICATION OF THUNDERSTORM ACTIVITY AHEAD OF WEAK SURFACE COLD FRONT ACROSS EASTERN OKLAHOMA APPEARS TO BE IN RESPONSE TO APPROACH OF ANOTHER JET STREAK EMBEDDED WITHIN STRONG CYCLONIC UPPER FLOW REGIME. SPEED MAXIMUM NOW MIGRATING ACROSS NORTHWEST TEXAS WILL CONTINUE ACROSS THE ARKLATEX OVERNIGHT...WHERE LOW-LEVEL WARM ADVECTION WILL CONTINUE TO STRENGTHEN NEXT FEW HOURS ALONG SOUTH SOUTHWESTERLY LOW-LEVEL JET AXIS. A LARGER CONVECTIVE CLUSTER MAY GRADUALLY DEVELOP VICINITY OF OLD OUTFLOW BOUNDARY ACROSS SOUTHWEST ARKANSAS...GRADUALLY DEVELOPING NORTHEASTWARD TOWARD THE MEMPHIS AREA OVERNIGHT. ..KERR.. 05/07/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MEG...JAN...LZK...SHV... 33959483 34579407 35159278 35659168 35749097 34809036 33259156 32939439
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 7:15 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 5 hr |
| May 6, 7:53 PM CDT | Mesoscale Discussion | SPC | Baxter, Cleburne, Conway, Faulkner, Fulton, Garland and 19 more | 2 hr |
| May 6, 11:30 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 67 more | 6 hr |
| May 7, 2:27 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 64 more | 3 hr |
| May 7, 4:55 AM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Chicot, Crittenden, Cross and 8 more | 6 hr |
| May 7, 7:06 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Chicot, Desha, Drew, Phillips and 1 more | 114 min |
| May 7, 10:50 AM CDT | Tornado Watch | SPC | Ashley, Chicot, Drew | 5 hr |
| May 7, 1:54 PM CDT | Mesoscale Discussion | SPC | Chicot | 2 hr |
| May 6, 7:48 PM CDT | Mesoscale Discussion | SPC | Collin, Cooke, Dallas, Denton, Erath, Fannin and 12 more | 117 min |
| May 7, 2:17 PM CDT | Mesoscale Discussion | SPC | Borden, Coke, Concho, Dawson, Fisher, Garza and 19 more | 103 min |
| May 7, 5:00 PM CDT | Tornado Watch | SPC | Archer, Armstrong, Baylor, Briscoe, Callahan, Carson and 33 more | 6 hr |
| May 7, 5:38 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Clay, Eastland, Fisher and 16 more | 97 min |
Nearby
Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003
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.