Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 196

March 17, 201417 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2014, 8:52 AM EDT for 17 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 17, 2014, 8:52 AM EDT (12:52 UTC)
Expired: Mar 17, 2014, 11:15 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Manatee County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL

The radar

The Tampa radar (KTBW), 65 km from the middle of the area, began a volume at 12:53 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 32Mar 17, 12:45 PM EDT

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 0.9 hours before the alert went out and 65 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: 885 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 281 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 6.2

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 17, 12:43 PM EDT	Tornado Watch	SPC	Brevard, Charlotte, DeSoto, Hardee, Hernando, Highlands and 17 more	8 hr
Mar 17, 3:02 PM EDT	Mesoscale Discussion	SPC	Brevard, Charlotte, DeSoto, Glades, Hardee, Highlands and 15 more	58 min

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.