Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 2192

December 2, 200922 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Dec 2, 2009, 10:08 PM EST for 22 counties in Florida. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Dec 2, 2009, 10:08 PM EST (03:08 UTC)
Expired
Dec 2, 2009, 11:45 PM EST
In force
97 min
Issued by
the Storm Prediction Center
All 22 counties

Brevard County, FL, Citrus County, FL, Clay County, FL, DeSoto County, FL, Flagler County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Marion County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 110 km from the middle of the area, began a volume at 03:07 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 00:00Z, 3.1 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-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 2009-12-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 834 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2009-12-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 285 square meters per square second.19395878Sfc1 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
834 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
945 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
285 m²/s²
0-3 km storm-relative helicity
296 m²/s²
Significant tornado parameter
1.1
Supercell composite
9.1

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.

IssuedProductOfficeCountiesLasted
Dec 2, 7:44 PM ESTTornado WatchSPCBrevard, Citrus, Clay, DeSoto, Flagler, Hardee and 16 more8 hr

Nearby

Mesoscale Discussions in Florida, 2009Every mesoscale discussion in 2009

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.