Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 1813

July 13, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2003, 3:53 PM CDT for 4 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jul 13, 2003, 3:53 PM CDT (20:53 UTC)
Expired
Jul 13, 2003, 5:00 PM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 77 counties

Colbert County, AL, Lauderdale County, AL, Arkansas County, AR, Ashley County, AR, Chicot County, AR, Crittenden County, AR, Desha County, AR, Lee County, AR, Monroe County, AR, Phillips County, AR, St. Francis County, AR, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Washington County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Perry County, TN, Rutherford County, TN, Shelby County, TN, Smith County, TN, Stewart County, TN, Tipton County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

The watches that followed

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

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 8.9 hours before the alert went out and 48 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, Little Rock, AR at 12:00Z on 2003-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2438 joules per kilogram.LCLLFCEL10008507005003002001001 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, Little Rock, AR at 12:00Z on 2003-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.1939Sfc1 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
2438 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
1048 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

015 
ACUS11 KWNS 132053
SWOMCD
SPC MCD 132053 
TNZ000-ALZ000-MSZ000-ARZ000-LAZ000-132200-

MESOSCALE DISCUSSION 1813
NWS STORM PREDICTION CENTER NORMAN OK
0353 PM CDT SUN JUL 13 2003

AREAS AFFECTED...SERN AR...NRN MS AND WRN TN

CONCERNING...SEVERE THUNDERSTORM WATCH 736...

VALID 132053Z - 132200Z

THREAT FOR ISOLATED DAMAGING WIND AND LARGE HAIL WILL PERSIST AT
LEAST ANOTHER COUPLE HOURS...MAINLY ACROSS PARTS OF NRN MS AND
WRN/MIDDLE TN.

SCATTERED MULTICELL STORMS CONTINUE DEVELOPING ALONG NUMEROUS
OUTFLOW BOUNDARIES FROM WRN TN SWWD THROUGH NRN MS. PORTION OF
OUTFLOW BOUNDARY ACROSS NWRN MS HAS BEEN GENERALLY FREE OF
CONVECTION. HOWEVER...BUT NEW CELLS ARE BEGINNING TO DEVELOP ALONG
THE BOUNDARY AND THIS ACTIVITY WILL SUBSEQUENTLY SPREAD SEWD INTO N
CNTRL MS WHERE ATMOSPHERE IS MODERATELY UNSTABLE.

..DIAL.. 07/13/2003

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

ATTN...WFO...OHX...HUN...MEG...JAN...LZK...

32969192 33889134 34619152 35878968 36438852 36508704
36328544 35128722 33758907 32939038

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 13, 11:02 AM CDTMesoscale DiscussionSPCBibb, Choctaw, Clarke, Dallas, Fayette, Greene and 12 more118 min
Jul 13, 11:55 AM CDTSevere Thunderstorm WatchSPCColbert, Lauderdale6 hr
Jul 13, 3:05 PM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 12 more5 hr
Jul 13, 5:26 PM CDTMesoscale DiscussionSPCJackson94 min
Jul 13, 5:55 PM CDTSevere Thunderstorm WatchSPCColbert, Franklin, Lamar, Lauderdale, Lawrence, Limestone and 1 more4 hr
Jul 13, 11:30 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Cleveland, Columbia, Crittenden and 11 more2 hr
Jul 13, 1:30 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Johnson and 6 more60 min
Jul 13, 4:44 PM CDTMesoscale DiscussionSPCBaxter, Boone, Clay, Cleburne, Craighead, Fulton and 12 more61 min
Jul 13, 5:10 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Carroll, Cleburne, Craighead, Crittenden and 18 more5 hr
Jul 13, 6:54 PM CDTMesoscale DiscussionSPCCrittenden, Cross, Jackson, Lee, Monroe, Poinsett and 4 more96 min
Jul 13, 1:55 PM CDTSevere Thunderstorm WatchSPCAdams5 hr
Jul 13, 4:33 PM CDTMesoscale DiscussionSPCAdams87 min
Jul 13, 12:16 PM CDTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 39 more119 min

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Arkansas, 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.