Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 470

April 14, 20139 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2013, 1:05 PM CDT for 9 counties in Florida. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2013, 1:05 PM CDT (18:05 UTC)
Expired: Apr 14, 2013, 2:30 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Bay County, FL, Calhoun County, FL, Gadsden County, FL, Gulf County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Taylor County, FL, Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 33 km from the middle of the area, began a volume at 18:09 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 12:00Z, 6.1 hours before the alert went out and 34 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: 1960 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, 9:24 AM CDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gulf, Liberty, Okaloosa and 3 more	96 min
Apr 14, 9:57 AM CDT	Tornado Watch	SPC	Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more	8 hr
Apr 14, 12:03 PM CDT	Mesoscale Discussion	SPC	Glades, Hardee, Highlands, Lake, Marion, Okeechobee and 5 more	87 min
Apr 14, 12:52 PM CDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Citrus, Clay and 23 more	9 hr
Apr 14, 3:17 PM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	88 min
Apr 14, 5:44 PM CDT	Mesoscale Discussion	SPC	Alachua, Dixie, Gilchrist, Lafayette, Lake, Marion and 4 more	91 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.