Alert archive / Florida / Mesoscale Discussions in 2015

Mesoscale Discussion 104

February 26, 201514 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 26, 2015, 2:14 AM EST for 14 counties in Florida. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Feb 26, 2015, 2:14 AM EST (07:14 UTC)
Expired: Feb 26, 2015, 3:45 AM EST
In force: 91 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Alachua County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Hernando County, FL, Hillsborough County, FL, Manatee County, FL, Marion County, FL, Pasco County, FL, Pinellas County, FL, Putnam County, FL, Saint Johns County, FL, Sarasota County, FL, Sumter County, FL

The radar

The Tampa radar (KTBW), 62 km from the middle of the area, began a volume at 07:15 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

Jacksonville, FL (KJAX), launched 00:00Z, 7.2 hours before the alert went out and 271 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 416 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 401 m²/s²
0-3 km storm-relative helicity: 459 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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
Feb 25, 8:29 PM EST	Mesoscale Discussion	SPC	Calhoun, Dixie, Gadsden, Hamilton, Jefferson, Lafayette and 6 more	91 min
Feb 25, 10:48 PM EST	Mesoscale Discussion	SPC	Baker, Columbia, Hamilton, Lafayette, Madison, Nassau and 2 more	87 min

Nearby

Mesoscale Discussions in Florida, 2015 Every mesoscale discussion in 2015

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.