Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 1997

August 13, 20048 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2004, 9:51 PM EDT for 8 counties in Florida. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Aug 13, 2004, 9:51 PM EDT (01:51 UTC)
Expired
Aug 13, 2004, 10:45 PM EDT
In force
54 min
Issued by
the Storm Prediction Center

Counties Brevard County, FL, Flagler County, FL, Indian River County, FL, Lake County, FL, Orange County, FL, Osceola County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 70 km from the middle of the area, began a volume at 01:51 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, 1.9 hours before the alert went out and 187 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 2004-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 110 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 2004-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -66 square meters per square second.193958Sfc1 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
110 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-66 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

685 
ACUS11 KWNS 140151
SWOMCD
SPC MCD 140151 
FLZ000-140245-

MESOSCALE DISCUSSION 1997
NWS STORM PREDICTION CENTER NORMAN OK
0851 PM CDT FRI AUG 13 2004

AREAS AFFECTED...FL PENINSULA

CONCERNING...TORNADO WATCH 750...

VALID 140151Z - 140245Z

TORNADO THREAT LIMITED TO EAST CENTRAL FL PENINSULA...MAINLY FROM
MLB NWWD TO NEAR DAB. 

AT 0145Z...RADAR INDICATED THE CENTER OF HURRICANE CHARLEY WAS JUST
NORTHEAST OF ORL AND CONTINUED TO MOVE NNEWD AT 20 KT. THIS MOTION
PLACES THE CENTER NEAR DAB AT 03Z AND OFFSHORE SHORTLY THEREAFTER.
THE GREATEST TORNADO THREAT IS LOCATED IN THE BANDS TO THE NORTH AND
EAST OF THE CENTER...WHERE 1 KM SRH IS NEAR 250 M2/S2. GIVEN THE
CURRENT MOTION OF THE SYSTEM...IT APPEARS THE TORNADO WATCH WILL NOT
HAVE TO BE EXTENDED NWD...AND THE CURRENT WATCH SHOULD EXPIRE AS
SCHEDULED AT 06Z OR POSSIBLY EVEN CANCELLED EARLY.

..IMY.. 08/14/2004

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

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

29698033 28048007 27658032 27748091 28368161 28858189
29668153

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 13, 8:02 PM EDTMesoscale DiscussionSPCBrevard, Collier, Glades, Hendry, Indian River, Lake and 9 more58 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.