Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 2463

October 28, 200320 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Oct 28, 2003, 10:52 AM EST for 20 counties in Florida. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Oct 28, 2003, 10:52 AM EST (15:52 UTC)
Expired: Oct 28, 2003, 11:45 AM EST
In force: 53 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm potential

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Franklin County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL

The watches that followed

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

Tornado Watch 941Oct 28, 11:20 AM EST

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 3.9 hours before the alert went out and 181 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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.

Issued	Product	Office	Counties	Lasted
Oct 28, 11:20 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 13 more	6 hr
Oct 28, 12:24 PM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 13 more	66 min
Oct 28, 3:05 PM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 13 more	55 min
Oct 28, 3:55 PM EST	Mesoscale Discussion	SPC	Baker, Columbia, Dixie, Gilchrist, Lafayette, Nassau and 2 more	65 min
Oct 28, 4:30 PM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Dixie and 12 more	6 hr
Oct 28, 6:24 PM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Duval and 11 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2003 Every 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.