Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 2190

December 2, 200918 counties in Florida; 6 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Dec 2, 2009, 6:39 PM EST for 18 counties in Florida; 6 counties in Georgia. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Dec 2, 2009, 6:39 PM EST (23:39 UTC)
Expired
Dec 2, 2009, 8:15 PM EST
In force
96 min
Issued by
the Storm Prediction Center
All 24 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hernando County, FL, Levy County, FL, Marion County, FL, Nassau County, FL, Pasco County, FL, Putnam County, FL, Saint Johns County, FL, Sumter County, FL, Union County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Glynn County, GA, Pierce County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 72 km from the middle of the area, began a volume at 23:43 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.7 hours before the alert went out and 73 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, Jacksonville, FL at 12:00Z on 2009-12-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 157 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, Jacksonville, FL at 12:00Z on 2009-12-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 283 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
157 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
602 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
283 m²/s²
0-3 km storm-relative helicity
304 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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, 12:10 AM ESTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 8 more2 hr
Dec 2, 4:11 AM ESTTornado WatchSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more6 hr
Dec 2, 6:02 AM ESTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more58 min
Dec 2, 9:52 AM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 9 more83 min
Dec 2, 10:32 AM ESTTornado WatchSPCColumbia, Dixie, Franklin, Gadsden, Gilchrist, Hamilton and 8 more6 hr
Dec 2, 12:48 PM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 9 more117 min
Dec 2, 2:46 PM ESTTornado WatchSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 14 more7 hr
Dec 2, 1:31 PM ESTMesoscale DiscussionSPCBaldwin, Bleckley, Bryan, Bulloch, Burke, Candler and 23 more89 min
Dec 2, 2:08 PM ESTTornado WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more8 hr
Dec 2, 5:44 PM ESTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more91 min

Nearby

Mesoscale Discussions in Florida, 2009Mesoscale Discussions in Georgia, 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.