Alert archive / Arkansas / Mesoscale Discussions in 2003

Mesoscale Discussion 415

April 6, 200322 counties in Arkansas; 11 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 2:18 PM CDT for 22 counties in Arkansas; 11 counties in Oklahoma. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 6, 2003, 2:18 PM CDT (19:18 UTC)
Expired
Apr 6, 2003, 3:15 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 33 counties

Boone County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 64 km from the middle of the area, began a volume at 19:20 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

Springfield, MO (KSGF), launched 12:00Z, 7.3 hours before the alert went out and 250 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, Springfield, MO at 12:00Z on 2003-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Springfield, MO at 12:00Z on 2003-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 251 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
628 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
251 m²/s²
0-3 km storm-relative helicity
1244 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.

000 
ACUS11 KWNS 061919
SWOMCD
SPC MCD 061918 
ARZ000-OKZ000-TXZ000-062015-

MESOSCALE DISCUSSION 0415
NWS STORM PREDICTION CENTER NORMAN OK
0218 PM CDT SUN APR 06 2003

AREAS AFFECTED...ERN OK AND WRN AR

CONCERNING...SEVERE THUNDERSTORM WATCH 100...

VALID 061918Z - 062015Z

...A NEW SEVERE THUNDERSTORM WATCH WILL BE REQUIRED BY 20 UTC...



WS100 EXPIRES AT 20 UTC...BUT TSTMS CONTINUE TO FORM ALONG/AHEAD
OF THE DRY LINE AND MOVE ENEWD ACROSS ECNTRL/SERN OK AND NERN TX.
 THUS...A NEW WW WILL BE REQUIRED.



MESOANALYSIS SHOWS THAT A WEDGE OF MID 60S DEW POINTS HAS EDGED
NWD INTO SERN OK AROUND SRN PERIPHERY OF THE SURFACE
RIDGE/THERMAL TROUGH SITUATED ACROSS MOST OF AR.  TSTMS THAT
INITIATED ALONG/AHEAD OF THE DRY LINE...NOW SURGING ACROSS CNTRL
OK...CONTINUE TO INTENSIFY WITHIN THIS AIR MASS.  DEEP LAYER
SHEAR REMAINS FAVORABLE FOR SUPERCELLS.  ISOLD TORNADO IS STILL
POSSIBLE ACROSS EXTREME SERN OK...BUT THE MAIN THREAT APPEARS TO
BE VERY LARGE HAIL...ESPECIALLY AS THE STORMS MOVE ACROSS THE
WARM FRONT AND BECOME ELEVATED.  ACTIVITY WILL TRANSLATE NEWD
ACROSS WRN AR DURING THE NEXT FEW HOURS.



..RACY.. 04/06/2003

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

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

33989643 35099584 36219433 36479271 35809252 34169299
33939350 33939493 33969636

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 6, 7:38 AM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Lafayette and 3 more97 min
Apr 6, 7:50 AM CDTSevere Thunderstorm WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 6 more5 hr
Apr 6, 8:56 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 21 more2 hr
Apr 6, 9:45 AM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Carroll, Conway, Crawford and 22 more5 hr
Apr 6, 10:00 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Chicot, Desha, Drew, Jefferson and 4 more2 hr
Apr 6, 10:20 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 21 more55 min
Apr 6, 10:30 AM CDTTornado WatchSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 6 more6 hr
Apr 6, 11:05 AM CDTSevere Thunderstorm WatchSPCArkansas, Baxter, Cleburne, Cleveland, Craighead, Crittenden and 27 more5 hr
Apr 6, 12:27 PM CDTMesoscale DiscussionSPCArkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 46 more2 hr
Apr 6, 2:55 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Clark, Cleburne, Conway, Crawford and 35 more5 hr
Apr 6, 3:45 PM CDTTornado WatchSPCAshley, Chicot, Union5 hr
Apr 6, 5:35 PM CDTMesoscale DiscussionSPCAshley, Chicot, Union115 min
Apr 6, 6:23 PM CDTMesoscale DiscussionSPCAshley, Chicot, Union97 min
Apr 5, 6:35 PM CSTMesoscale DiscussionSPCLove115 min
Apr 5, 6:40 PM CSTTornado WatchSPCJackson5 hr
Apr 5, 6:55 PM CSTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 14 more95 min
Apr 5, 7:10 PM CSTSevere Thunderstorm WatchSPCBeckham, Blaine, Caddo, Canadian, Carter, Cleveland and 25 more5 hr
Apr 5, 8:04 PM CSTMesoscale DiscussionSPCLove116 min
Apr 5, 9:35 PM CSTTornado WatchSPCLove5 hr
Apr 5, 11:10 PM CSTMesoscale DiscussionSPCAdair, Alfalfa, Atoka, Beckham, Blaine, Bryan and 54 more65 min
Apr 5, 11:35 PM CSTSevere Thunderstorm WatchSPCAtoka, Beckham, Blaine, Caddo, Canadian, Carter and 51 more5 hr
Apr 6, 5:09 AM CDTMesoscale DiscussionSPCAlfalfa, Atoka, Beckham, Blaine, Caddo, Canadian and 47 more96 min
Apr 6, 5:35 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cherokee and 46 more4 hr
Apr 6, 7:45 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 44 more2 hr

Nearby

Mesoscale Discussions in Arkansas, 2003Mesoscale Discussions in Oklahoma, 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.