Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 302

March 23, 201317 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2013, 2:15 PM EDT for 17 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 23, 2013, 2:15 PM EDT (18:15 UTC)
Expired: Mar 23, 2013, 4:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Alachua County, FL, Brevard County, FL, Citrus County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Levy County, FL, Marion County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Putnam County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 115 km from the middle of the area, began a volume at 18:18 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, 6.3 hours before the alert went out and 115 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: 1551 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 474 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.2

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
Mar 23, 8:38 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more	97 min
Mar 23, 10:54 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more	36 min
Mar 23, 10:59 AM EDT	Severe Thunderstorm Watch	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 8 more	6 hr
Mar 23, 12:16 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 6 more	89 min
Mar 23, 1:25 PM EDT	Mesoscale Discussion	SPC	Bradford, Clay, Columbia, Union	35 min
Mar 23, 1:35 PM EDT	Mesoscale Discussion	SPC	Escambia, Santa Rosa	85 min
Mar 23, 1:56 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more	9 hr
Mar 23, 2:44 PM EDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more	31 min
Mar 23, 3:52 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 12 more	83 min
Mar 23, 4:33 PM EDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Nassau and 1 more	27 min
Mar 23, 6:22 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 11 more	53 min

Nearby

Mesoscale Discussions in Florida, 2013 Every mesoscale discussion in 2013

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.