Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 1992

August 13, 200435 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2004, 4:06 PM EDT for 35 counties in Florida. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Aug 13, 2004, 4:06 PM EDT (20:06 UTC)
Expired
Aug 13, 2004, 5:30 PM EDT
In force
84 min
Issued by
the Storm Prediction Center
All 35 counties

Alachua County, FL, Brevard County, FL, Broward County, FL, Charlotte County, FL, Citrus County, FL, Collier County, FL, DeSoto County, FL, Flagler County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Pasco County, FL, Polk County, FL, Putnam County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 76 km from the middle of the area, began a volume at 20:06 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, 8.1 hours before the alert went out and 76 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-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2004-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2004-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -160 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1607 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-160 m²/s²
0-3 km storm-relative helicity
-117 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.

IssuedProductOfficeCountiesLasted
Aug 12, 9:00 PM EDTMesoscale DiscussionSPCCharlotte, Collier, Hendry, Lee, Miami-Dade, Monroe3 hr
Aug 12, 9:35 PM EDTTornado WatchSPCBroward, Charlotte, Collier, Glades, Hendry, Lee and 4 more10 hr
Aug 13, 2:21 AM EDTMesoscale DiscussionSPCBroward, Charlotte, Collier, Glades, Hendry, Lee and 4 more114 min
Aug 13, 6:46 AM EDTMesoscale DiscussionSPCBroward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more119 min
Aug 13, 7:30 AM EDTTornado WatchSPCBroward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more10 hr
Aug 13, 11:04 AM EDTMesoscale DiscussionSPCBroward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more86 min
Aug 13, 1:02 PM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Citrus, Collier, DeSoto and 26 more88 min
Aug 13, 1:45 PM EDTTornado WatchSPCAlachua, Brevard, Broward, Charlotte, Citrus, Collier and 29 more12 hr
Aug 13, 6:14 PM EDTMesoscale DiscussionSPCBroward, Citrus, Collier, Glades, Hardee, Hendry and 14 more61 min

Nearby

Mesoscale Discussions in Florida, 2004Every mesoscale discussion in 2004

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.