Alert archive / Florida / Mesoscale Discussions in 2016

Mesoscale Discussion 330

April 1, 201612 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2016, 7:35 PM EDT for 12 counties in Florida. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2016, 7:35 PM EDT (23:35 UTC)
Expired: Apr 1, 2016, 9:00 PM EDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Columbia County, FL, Franklin County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 57 km from the middle of the area, began a volume at 23:35 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 76Apr 1, 9:00 PM EDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 11.6 hours before the alert went out and 54 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: 339 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.2

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
Apr 1, 2:48 PM EDT	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 8 more	6 hr
Apr 1, 5:40 PM EDT	Mesoscale Discussion	SPC	Nassau	65 min

Nearby

Mesoscale Discussions in Florida, 2016 Every mesoscale discussion in 2016

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.