Alert archive / Florida / Mesoscale Discussions in 2005

Mesoscale Discussion 522

April 7, 200523 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2005, 7:20 PM EDT for 23 counties in Florida. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Apr 7, 2005, 7:20 PM EDT (23:20 UTC)
Expired: Apr 7, 2005, 8:15 PM EDT
In force: 55 min
Issued by: the Storm Prediction Center

All 23 counties

Brevard County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Manatee County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Polk County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 55 km from the middle of the area, began a volume at 23:24 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 139Apr 7, 10:20 PM EDT

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 11.3 hours before the alert went out and 55 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: 31 J/kg
Mixed-layer CIN: -253 J/kg
Mixed-layer LCL: 1011 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 309 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
Apr 6, 8:00 PM EDT	Severe Thunderstorm Watch	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more	4 hr
Apr 6, 11:36 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more	54 min
Apr 7, 4:53 AM EDT	Mesoscale Discussion	SPC	Gulf, Jefferson, Lafayette, Leon, Liberty, Madison and 2 more	2 hr
Apr 7, 8:52 AM EDT	Mesoscale Discussion	SPC	Alachua, Citrus, Columbia, Dixie, Gilchrist, Lafayette and 4 more	113 min
Apr 7, 11:25 AM EDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	8 hr
Apr 7, 1:00 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more	2 hr
Apr 7, 4:18 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more	87 min
Apr 7, 5:50 PM EDT	Severe Thunderstorm Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 20 more	6 hr

Nearby

Mesoscale Discussions in Florida, 2005 Every mesoscale discussion in 2005

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.