Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 298

March 28, 201117 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 28, 2011, 1:59 AM EDT for 17 counties in Florida. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Mar 28, 2011, 1:59 AM EDT (05:59 UTC)
Expired: Mar 28, 2011, 3:30 AM EDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Columbia County, FL, Dixie County, FL, Gadsden County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL

The radar

The Tallahassee radar (KTLH), 100 km from the middle of the area, began a volume at 06:00 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.

Severe Thunderstorm Watch 70Mar 28, 2:45 AM EDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 6.0 hours before the alert went out and 98 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: 1716 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.1

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
Mar 28, 2:43 AM EDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Franklin and 12 more	3 hr
Mar 28, 6:31 AM EDT	Mesoscale Discussion	SPC	Charlotte, Collier, Glades, Hendry, Lee, Martin and 3 more	59 min
Mar 28, 6:48 AM EDT	Severe Thunderstorm Watch	SPC	Broward, Charlotte, Collier, DeSoto, Glades, Hendry and 7 more	5 hr
Mar 28, 5:49 PM EDT	Mesoscale Discussion	SPC	Broward, Charlotte, Collier, Hendry, Lee, Miami-Dade and 1 more	56 min
Mar 28, 6:12 PM EDT	Mesoscale Discussion	SPC	Baker, Calhoun, Columbia, Gadsden, Gulf, Hamilton and 9 more	63 min

Nearby

Mesoscale Discussions in Florida, 2011 Every mesoscale discussion in 2011

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.