Alert archive / Georgia / Mesoscale Discussions in 2003

Mesoscale Discussion 575

April 25, 20037 counties in Florida; 16 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 10:22 AM EDT for 7 counties in Florida; 16 counties in Georgia. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2003, 10:22 AM EDT (14:22 UTC)
Expired
Apr 25, 2003, 12:15 PM EDT
In force
113 min
Issued by
the Storm Prediction Center
All 23 counties

Gadsden County, FL, Hamilton County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Wakulla County, FL, Atkinson County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lowndes County, GA, Thomas County, GA, Tift 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 12:00Z, 2.4 hours before the alert went out and 57 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 12:00Z on 2003-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 426 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 12:00Z on 2003-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 302 square meters per square second.193958Sfc1 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
426 J/kg
Mixed-layer CIN
-68 J/kg
Mixed-layer LCL
718 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
302 m²/s²
0-3 km storm-relative helicity
402 m²/s²
Significant tornado parameter
0.4
Supercell composite
7.7

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
Apr 25, 4:05 AM EDTMesoscale DiscussionSPCEscambia85 min
Apr 25, 6:40 AM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more65 min
Apr 25, 7:05 AM EDTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more6 hr
Apr 25, 8:41 AM EDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more94 min
Apr 25, 11:45 AM EDTSevere Thunderstorm WatchSPCBaker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 3 more5 hr
Apr 25, 1:01 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more119 min
Apr 25, 2:15 PM EDTSevere Thunderstorm WatchSPCAlachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more5 hr
Apr 25, 3:17 PM EDTMesoscale DiscussionSPCAlachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more118 min
Apr 25, 6:35 PM EDTMesoscale DiscussionSPCCitrus, Hernando, Lake, Orange, Pasco, Seminole and 2 more55 min
Apr 25, 1:45 PM EDTTornado WatchSPCCatoosa, Chattooga, Dade, Floyd, Walker5 hr
Apr 25, 4:08 PM EDTMesoscale DiscussionSPCCarroll, Chattahoochee, Clayton, Cobb, Coweta, Douglas and 17 more2 hr
Apr 25, 6:00 PM EDTTornado WatchSPCBarrow, Bartow, Bibb, Butts, Carroll, Catoosa and 51 more5 hr

Nearby

Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in Florida, 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.