Alert archive / Florida / Mesoscale Discussions in 2008

Mesoscale Discussion 78

January 19, 200812 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 19, 2008, 6:06 PM EST for 12 counties in Florida. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jan 19, 2008, 6:06 PM EST (23:06 UTC)
Expired: Jan 19, 2008, 7:30 PM EST
In force: 84 min
Issued by: the Storm Prediction Center

Counties Flagler County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Manatee 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), 90 km from the middle of the area, began a volume at 23:06 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 nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 11.1 hours before the alert went out and 90 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: 13 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 233 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
Jan 19, 2:42 PM EST	Mesoscale Discussion	SPC	Brevard, Citrus, Flagler, Hernando, Hillsborough, Lake and 11 more	63 min
Jan 19, 3:29 PM EST	Tornado Watch	SPC	Alachua, Citrus, Flagler, Hernando, Hillsborough, Lake and 10 more	5 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.