Alert archive / Alabama / Mesoscale Discussions in 2003

Mesoscale Discussion 298

March 19, 200314 counties in Alabama; 7 counties in Florida; Clay County, Early County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2003, 8:41 PM CST for 14 counties in Alabama; 7 counties in Florida; Clay County, Early County, Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Mar 19, 2003, 8:41 PM CST (02:41 UTC)
Expired
Mar 19, 2003, 11:15 PM CST
In force
3 hr
Issued by
the Storm Prediction Center
All 23 counties

Baldwin County, AL, Barbour County, AL, Butler County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Mobile County, AL, Pike County, AL, Escambia County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Clay County, GA, Early County, GA

The watches that followed

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

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.7 hours before the alert went out and 214 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, Tallahassee Rgnl, FL at 00:00Z on 2003-03-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1137 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, Tallahassee Rgnl, FL at 00:00Z on 2003-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
1137 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
511 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
162 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.3

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
Mar 19, 9:25 PM CSTTornado WatchSPCBarbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 8 more6 hr
Mar 19, 11:52 PM CSTMesoscale DiscussionSPCHenry, Houston2 hr
Mar 20, 2:06 AM CSTMesoscale DiscussionSPCCalhoun, Gadsden, Jackson, Leon, Liberty54 min
Mar 20, 2:40 AM CSTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 7 more5 hr
Mar 20, 5:12 AM CSTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Hamilton, Jefferson and 5 more2 hr
Mar 20, 1:35 PM CSTTornado WatchSPCColumbia, Gadsden, Hamilton, Jefferson, Leon, Liberty and 1 more6 hr
Mar 20, 3:21 PM CSTMesoscale DiscussionSPCBaker, Hamilton, Jefferson, Madison, Nassau114 min
Mar 20, 5:57 PM CSTMesoscale DiscussionSPCBaker, Columbia, Hamilton, Jefferson, Lafayette, Leon and 5 more2 hr
Mar 19, 6:04 PM CSTMesoscale DiscussionSPCAppling, Bacon, Brantley, Bryan, Bulloch, Camden and 15 more116 min
Mar 19, 6:15 PM CSTTornado WatchSPCAppling, Bacon, Bryan, Bulloch, Candler, Chatham and 11 more4 hr
Mar 19, 7:58 PM CSTMesoscale DiscussionSPCBurke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 6 more3 hr
Mar 19, 10:16 PM CSTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bartow, Butts, Carroll and 50 more2 hr
Mar 19, 11:20 PM CSTSevere Thunderstorm WatchSPCBanks, Barrow, Butts, Clarke, Clayton, Cobb and 38 more4 hr
Mar 20, 7:40 AM CSTTornado WatchSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 20 more6 hr
Mar 20, 10:09 AM CSTMesoscale DiscussionSPCAtkinson, Berrien, Brantley, Brooks, Clinch, Colquitt and 6 more2 hr
Mar 20, 12:33 PM CSTMesoscale DiscussionSPCAppling, Atkinson, Bacon, Berrien, Brantley, Brooks and 10 more117 min

Nearby

Mesoscale Discussions in Alabama, 2003Mesoscale Discussions in Florida, 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.