Alert archive / Florida / Mesoscale Discussions in 2008

Mesoscale Discussion 2403

November 30, 200812 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2008, 12:24 PM EST for 12 counties in Florida. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Nov 30, 2008, 12:24 PM EST (17:24 UTC)
Expired: Nov 30, 2008, 2:00 PM EST
In force: 96 min
Issued by: the Storm Prediction Center

Counties Flagler County, FL, Hillsborough County, FL, Lake County, FL, Marion County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Putnam County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 120 km from the middle of the area, began a volume at 17:25 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 940Nov 30, 1:05 PM EST

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 5.4 hours before the alert went out and 116 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: 70 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 437 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 30, 3:46 AM EST	Mesoscale Discussion	SPC	Columbia, Franklin, Hamilton, Jefferson, Lafayette, Leon and 4 more	89 min
Nov 30, 4:59 AM EST	Tornado Watch	SPC	Columbia, Dixie, Franklin, Gilchrist, Hamilton, Jefferson and 6 more	7 hr
Nov 30, 7:54 AM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 4 more	96 min
Nov 30, 9:51 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Duval and 18 more	7 hr
Nov 30, 1:05 PM EST	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 13 more	8 hr
Nov 30, 3:53 PM EST	Mesoscale Discussion	SPC	Broward, Collier, Hendry, Martin, Miami-Dade, Monroe and 2 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2008 Every mesoscale discussion in 2008

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.