Alert archive / Florida / Mesoscale Discussions in 2019

Mesoscale Discussion 2197

December 14, 201915 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Dec 14, 2019, 3:17 AM EST for 15 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 14, 2019, 3:17 AM EST (08:17 UTC)
Expired: Dec 14, 2019, 5:45 AM EST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties DeSoto County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 60 km from the middle of the area, began a volume at 08:19 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.

Severe Thunderstorm Watch 699Dec 14, 3:45 AM EST

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 00:00Z, 8.3 hours before the alert went out and 151 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: 376 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 992 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 5.6

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
Dec 14, 12:38 AM EST	Mesoscale Discussion	SPC	Alachua, Citrus, Dixie, Gilchrist, Hernando, Levy and 2 more	2 hr
Dec 14, 3:47 AM EST	Severe Thunderstorm Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Hardee, Hernando and 13 more	6 hr
Dec 14, 6:42 AM EST	Mesoscale Discussion	SPC	Alachua, Brevard, Charlotte, DeSoto, Flagler, Hardee and 17 more	2 hr

Nearby

Mesoscale Discussions in Florida, 2019 Every mesoscale discussion in 2019

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.