Alert archive / Florida / Mesoscale Discussions in 2008

Mesoscale Discussion 2118

August 19, 200819 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2008, 3:37 AM EDT for 19 counties in Florida. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Aug 19, 2008, 3:37 AM EDT (07:37 UTC)
Expired: Aug 19, 2008, 4:30 AM EDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Brevard County, FL, Broward County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Lee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Osceola County, FL, Palm Beach County, FL, Polk County, FL, Saint Lucie County, FL

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 841Aug 19, 7:05 AM EDT

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 7.6 hours before the alert went out and 94 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: 1454 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 7.7

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
Aug 18, 10:44 PM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 13 more	9 hr
Aug 19, 6:29 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Glades, Hardee, Hendry, Highlands and 11 more	31 min
Aug 19, 7:05 AM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more	9 hr
Aug 19, 11:32 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Flagler and 20 more	88 min
Aug 19, 3:04 PM EDT	Mesoscale Discussion	SPC	Brevard, Flagler, Indian River, Lake, Orange, Osceola and 3 more	86 min
Aug 19, 3:46 PM EDT	Tornado Watch	SPC	Brevard, Flagler, Indian River, Orange, Osceola, Putnam and 3 more	9 hr
Aug 19, 7:10 PM EDT	Mesoscale Discussion	SPC	Brevard	95 min

Nearby

Mesoscale Discussions in Florida, 2008 Every mesoscale discussion in 2008

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.