Alert archive / Florida / Mesoscale Discussions in 2024

Mesoscale Discussion 39

January 9, 202415 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 9, 2024, 6:48 PM EST for 15 counties in Florida. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jan 9, 2024, 6:48 PM EST (23:48 UTC)
Expired: Jan 9, 2024, 8:15 PM EST
In force: 87 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 6

Counties Brevard County, FL, Broward County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Lee County, FL, Martin County, FL, Okeechobee County, FL, Osceola County, FL, Palm Beach County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 128 km from the middle of the area, began a volume at 23:49 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 8Jan 9, 7:10 PM EST

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 11.8 hours before the alert went out and 166 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: 5 J/kg
Mixed-layer CIN: -376 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 558 m²/s²
0-3 km storm-relative helicity: 690 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 8, 8:03 PM EST	Mesoscale Discussion	SPC	Escambia, Santa Rosa	117 min
Jan 8, 9:42 PM EST	Tornado Watch	SPC	Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more	11 hr
Jan 9, 12:57 AM EST	Mesoscale Discussion	SPC	Escambia	93 min
Jan 9, 3:44 AM EST	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	2 hr
Jan 9, 6:36 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 9 more	3 hr
Jan 9, 7:07 AM EST	Tornado Watch	SPC	Bay, Calhoun, Columbia, Dixie, Franklin, Gadsden and 15 more	7 hr
Jan 9, 10:05 AM EST	Mesoscale Discussion	SPC	Franklin, Gadsden, Hamilton, Jefferson, Lafayette, Leon and 5 more	85 min
Jan 9, 10:45 AM EST	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Duval, Nassau, Putnam and 2 more	2 hr
Jan 9, 11:41 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Duval, Flagler and 5 more	6 hr
Jan 9, 12:42 PM EST	Mesoscale Discussion	SPC	Citrus, DeSoto, Hardee, Hernando, Hillsborough, Lake and 12 more	2 hr
Jan 9, 1:15 PM EST	Tornado Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Hardee, Hernando and 15 more	7 hr
Jan 9, 1:16 PM EST	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more	89 min
Jan 9, 3:34 PM EST	Mesoscale Discussion	SPC	Citrus, Clay, Duval, Flagler, Hernando, Hillsborough and 9 more	86 min

Nearby

Mesoscale Discussions in Florida, 2024 Every mesoscale discussion in 2024

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.