Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 358

April 15, 20144 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2014, 3:58 AM CDT for 4 counties in Florida. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Apr 15, 2014, 3:58 AM CDT (08:58 UTC)
Expired: Apr 15, 2014, 5:00 AM CDT
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Calhoun County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL

The radar

The Tallahassee radar (KTLH), 19 km from the middle of the area, began a volume at 09:01 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 9.0 hours before the alert went out and 22 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: 127 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 840 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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
Apr 14, 7:00 PM CDT	Mesoscale Discussion	SPC	Bay, Escambia, Holmes, Okaloosa, Santa Rosa, Walton and 1 more	60 min
Apr 14, 7:49 PM CDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 7 more	6 hr
Apr 14, 9:45 PM CDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Holmes, Jackson and 6 more	60 min
Apr 15, 1:30 AM CDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 10 more	60 min
Apr 15, 11:29 AM CDT	Mesoscale Discussion	SPC	Brevard, Citrus, Flagler, Hardee, Hernando, Hillsborough and 13 more	3 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.