Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 2538

November 19, 200315 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Nov 19, 2003, 6:11 AM EST for 15 counties in Florida. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Nov 19, 2003, 6:11 AM EST (11:11 UTC)
Expired: Nov 19, 2003, 8:45 AM EST
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Citrus County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Orange County, FL, Pasco County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 107 km from the middle of the area, began a volume at 11:11 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.

Tornado Watch 968Nov 19, 8:30 AM EST

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 11.2 hours before the alert went out and 212 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: 2 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 931 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 147 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.

Issued	Product	Office	Counties	Lasted
Nov 18, 7:45 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Liberty and 3 more	60 min
Nov 18, 7:46 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Liberty and 3 more	59 min
Nov 18, 9:10 PM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more	95 min
Nov 18, 10:45 PM EST	Tornado Watch	SPC	Bay, Calhoun, Gadsden, Gulf, Jackson, Jefferson and 6 more	6 hr
Nov 19, 12:22 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Jackson, Jefferson and 6 more	83 min
Nov 19, 2:43 AM EST	Mesoscale Discussion	SPC	Gadsden, Jefferson, Leon, Madison, Taylor, Wakulla	92 min
Nov 19, 4:20 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 12 more	6 hr
Nov 19, 8:30 AM EST	Tornado Watch	SPC	Charlotte, Citrus, Collier, DeSoto, Hardee, Hernando and 9 more	6 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; radar from the NEXRAD Level II archive.