Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 135

February 22, 200320 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 22, 2003, 3:48 PM EST for 20 counties in Florida. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued: Feb 22, 2003, 3:48 PM EST (20:48 UTC)
Expired: Feb 22, 2003, 4:15 PM EST
In force: 27 min
Issued by: the Storm Prediction Center

Counties Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Flagler 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, Saint Johns County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 89 km from the middle of the area, began a volume at 20:56 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

Tampa Bay, FL (KTBW), launched 12:00Z, 8.8 hours before the alert went out and 110 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: 356 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 803 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 254 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 6.1

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
Feb 21, 7:18 PM EST	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 7 more	3 hr
Feb 21, 8:26 PM EST	Mesoscale Discussion	SPC	Escambia	2 hr
Feb 21, 9:15 PM EST	Tornado Watch	SPC	Escambia, Okaloosa, Santa Rosa	6 hr
Feb 21, 11:22 PM EST	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	113 min
Feb 22, 12:40 AM EST	Tornado Watch	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more	6 hr
Feb 22, 1:35 AM EST	Tornado Watch	SPC	Escambia, Holmes, Okaloosa, Santa Rosa, Walton	5 hr
Feb 22, 4:51 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 6 more	114 min
Feb 22, 6:19 AM EST	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Jackson, Jefferson, Leon and 4 more	56 min
Feb 22, 6:50 AM EST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more	5 hr
Feb 22, 10:59 AM EST	Mesoscale Discussion	SPC	Baker, Duval, Nassau	61 min
Feb 22, 11:55 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 6 more	5 hr
Feb 22, 12:55 PM EST	Mesoscale Discussion	SPC	Brevard, Charlotte, DeSoto, Glades, Hardee, Highlands and 11 more	3 hr
Feb 22, 1:33 PM EST	Mesoscale Discussion	SPC	Brevard, Charlotte, DeSoto, Dixie, Glades, Hardee and 13 more	117 min
Feb 22, 1:49 PM EST	Mesoscale Discussion	SPC	Alachua, Bradford, Clay, Duval, Nassau, Putnam and 1 more	116 min

Nearby

Mesoscale Discussions in Florida, 2003 Every mesoscale discussion in 2003

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.