Alert archive / Florida / Mesoscale Discussions in 2008

Mesoscale Discussion 1012

May 24, 20087 counties in Florida; 5 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at May 24, 2008, 8:07 PM EDT for 7 counties in Florida; 5 counties in Georgia. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 24, 2008, 8:07 PM EDT (00:07 UTC)
Expired
May 24, 2008, 9:00 PM EDT
In force
53 min
Issued by
the Storm Prediction Center

Counties Baker County, FL, Bradford County, FL, Clay County, FL, Duval County, FL, Nassau County, FL, Saint Johns County, FL, Union County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Ware County, GA

The radar

The Jacksonville radar (KJAX), 2 km from the middle of the area, began a volume at 00:09 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

Jacksonville, FL (KJAX), launched 00:00Z, 0.1 hours before the alert went out and 3 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 00:00Z on 2008-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1007 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2008-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
1007 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1529 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 250007
SWOMCD
SPC MCD 250007 
FLZ000-GAZ000-250100-

MESOSCALE DISCUSSION 1012
NWS STORM PREDICTION CENTER NORMAN OK
0707 PM CDT SAT MAY 24 2008

AREAS AFFECTED...SERN GA...NERN FL...

CONCERNING...SEVERE THUNDERSTORM WATCH 350...

VALID 250007Z - 250100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 350
CONTINUES.

ISOLATED SEVERE STORMS WILL CONTINUE TO MOVE SSEWD THROUGH SERN GA
AND INTO NERN FL AND OVER THE COASTAL WATERS. MAIN THREATS OF LARGE
HAIL AND DMGG WINDS CAN BE EXPECTED.

A BROKEN LINE OF STRONG TO SEVERE STORMS CONTINUES TO MOVE SSEWD
THROUGH SERN GA AND INTO NERN FL ALONG A COLD FRONT. INCREASING FLOW
ALONG THE BASE OF THE UPPER TROUGH...IN ADDITION TO COOLING AND
UPPER DIVERGENCE...HAS AIDED IN THE DEVELOPMENT OF THUNDERSTORMS
CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF GOLF BALLS.
ADDITIONALLY...A N-S ORIENTED LINE OF CONVERGENCE ALONG THE SEA
BREEZE BOUNDARY SEEN ON RADAR ANALYZED ROUGHLY NEAR AMG THROUGH NRN
PUTNAM COUNTY...AND STRONG DOWNBURST WINDS MAY CONTINUE TO INITIATE
NEW CONVECTION DOWNSTREAM OF THESE STORMS. THREAT WILL STAY ELEVATED
OVER THE NEXT FEW HOURS UNTIL A GENERAL LOSS OF SURFACE BASED
INSTABILITY GRADUALLY DECREASES COVERAGE.

..HURLBUT.. 05/25/2008

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...JAX...

29808104 29888230 30558279 31468280 31178137 30768072

Nearby

Mesoscale Discussions in Florida, 2008Mesoscale Discussions in Georgia, 2008Every 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; radar from the NEXRAD Level II archive.