Alert archive / Georgia / Mesoscale Discussions in 2003

Mesoscale Discussion 1061

May 18, 200321 counties in Florida; 28 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at May 18, 2003, 6:22 PM EDT for 21 counties in Florida; 28 counties in Georgia. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 18, 2003, 6:22 PM EDT (22:22 UTC)
Expired
May 18, 2003, 7:45 PM EDT
In force
83 min
Issued by
the Storm Prediction Center
All 49 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Dodge County, GA, Echols County, GA, Glynn County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Telfair County, GA, Thomas County, GA, Tift County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA

The radar

The Jacksonville radar (KJAX), 64 km from the middle of the area, began a volume at 22:23 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 nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.4 hours before the alert went out and 65 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, Jacksonville, FL at 12:00Z on 2003-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2020 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, Jacksonville, FL at 12:00Z on 2003-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 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
2020 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
54 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 6:52 AM EDTMesoscale DiscussionSPCBay, Escambia, Holmes, Okaloosa, Santa Rosa, Walton and 1 more53 min
May 18, 11:18 AM EDTMesoscale DiscussionSPCCalhoun, Escambia, Gadsden, Holmes, Jackson, Leon and 5 more87 min
May 18, 12:00 PM EDTTornado WatchSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 8 more5 hr
May 18, 1:16 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Gilchrist and 8 more119 min
May 18, 1:40 PM EDTSevere Thunderstorm WatchSPCAlachua, Baker, Bradford, Clay, Columbia, Dixie and 17 more6 hr
May 18, 2:10 PM EDTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more95 min
May 18, 1:10 PM EDTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 17 more6 hr
May 18, 5:57 PM EDTMesoscale DiscussionSPCBurke, Candler, Columbia, Emanuel, Jefferson, Jenkins and 6 more63 min

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; radar from the NEXRAD Level II archive.