Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 940

May 11, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 11, 2003, 5:22 AM CDT for 4 states. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 11, 2003, 5:22 AM CDT (10:22 UTC)
Expired
May 11, 2003, 6:45 AM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 46 counties

Blount County, AL, Cullman County, AL, Fayette County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Walker County, AL, Winston County, AL, Dade County, GA, Lowndes County, MS, Bedford County, TN, Bledsoe County, TN, Campbell County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Van Buren County, TN, Warren County, TN, White County, TN

The radar

The Northeast Alabama radar (KHTX), 52 km from the middle of the area, began a volume at 10:24 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

Nashville Metro, TN (KBNA), launched 00:00Z, 10.4 hours before the alert went out and 146 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, Nashville Metro, TN at 00:00Z on 2003-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1200 joules per kilogram.LCLEL10008507005003002001001 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, Nashville Metro, TN at 00:00Z on 2003-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.19395878Sfc1 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
1200 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1378 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.2

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 11:20 PM CDTTornado WatchSPCColbert, Franklin, Lauderdale6 hr
May 11, 1:46 AM CDTMesoscale DiscussionSPCColbert, Lauderdale89 min
May 11, 3:10 AM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, DeKalb, Fayette, Greene and 17 more95 min
May 11, 3:20 AM CDTSevere Thunderstorm WatchSPCBlount, Cullman, Fayette, Jackson, Jefferson, Lamar and 8 more5 hr
May 11, 12:20 PM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Clarke, Coffee and 18 more115 min
May 11, 1:15 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bullock, Butler, Chambers, Chilton and 20 more6 hr
May 11, 3:00 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Choctaw, Clarke and 14 more2 hr
May 10, 10:04 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall, Panola, Tippah116 min
May 10, 7:06 PM CDTMesoscale DiscussionSPCCarroll, Crockett, Dyer, Gibson, Haywood, Henry and 5 more54 min
May 10, 8:45 PM CDTTornado WatchSPCDyer, Lake, Lauderdale, Obion, Shelby, Tipton5 hr
May 11, 5:55 AM CDTSevere Thunderstorm WatchSPCAnderson, Blount, Bradley, Carter, Claiborne, Cocke and 19 more5 hr

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Georgia, 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.