Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 1922

November 17, 201411 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2014, 3:10 PM EST for 11 counties in Florida. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Nov 17, 2014, 3:10 PM EST (20:10 UTC)
Expired: Nov 17, 2014, 4:15 PM EST
In force: 65 min
Issued by: the Storm Prediction Center

Counties DeSoto County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Orange County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 15 km from the middle of the area, began a volume at 20:12 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, 8.2 hours before the alert went out and 15 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: 152 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 702 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 278 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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
Nov 17, 12:50 AM EST	Mesoscale Discussion	SPC	Escambia, Santa Rosa	55 min
Nov 17, 2:13 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 12 more	32 min
Nov 17, 2:32 AM EST	Tornado Watch	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more	7 hr
Nov 17, 5:39 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more	66 min
Nov 17, 6:11 AM EST	Tornado Watch	SPC	Columbia, Dixie, Franklin, Gadsden, Hamilton, Jefferson and 7 more	8 hr
Nov 17, 8:43 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Columbia, Dixie, Franklin, Gadsden and 15 more	92 min
Nov 17, 10:57 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Duval, Flagler and 5 more	4 hr
Nov 17, 12:14 PM EST	Mesoscale Discussion	SPC	Brevard, Citrus, Dixie, Flagler, Hernando, Hillsborough and 11 more	2 hr
Nov 17, 12:30 PM EST	Tornado Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Hardee, Hernando and 16 more	6 hr

Nearby

Mesoscale Discussions in Florida, 2014 Every mesoscale discussion in 2014

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.