Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 324

March 23, 2003Glades County, Florida

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2003, 10:58 AM EST for Glades County, Florida. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Mar 23, 2003, 10:58 AM EST (15:58 UTC)
Expired
Mar 23, 2003, 1:30 PM EST
In force
3 hr
Issued by
the Storm Prediction Center

County Glades County, FL

The radar

The Tampa radar (KTBW), 139 km from the middle of the area, began a volume at 16:00 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, 4.0 hours before the alert went out and 139 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 2003-03-23Temperature 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 2003-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -33 square meters per square second.1939587897Sfc1 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
1377 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-33 m²/s²
0-3 km storm-relative helicity
38 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.

695 
ACUS11 KWNS 231559
SWOMCD
SPC MCD 231558 
FLZ000-231830-

MESOSCALE DISCUSSION 0324
NWS STORM PREDICTION CENTER NORMAN OK
0958 AM CST SUN MAR 23 2003

AREAS AFFECTED...SRN FL...FL KEYS

CONCERNING...CONVECTIVE TRENDS 

VALID 231558Z - 231830Z

CONVECTION IS INCREASING...BUT WW IS NOT CURRENTLY ANTICIPATED.



OUTFLOW BOUNDARY IS BECOMING QUASI-STATIONARY...EXTENDING FROM
NEAR PALM BEACH INTO AREAS SOUTH/SOUTHWEST OF FORT MYERS.  RECENT
NEW CONVECTIVE DEVELOPMENT APPEARS TO HAVE BEEN FORCED BY
CONVERGENCE ALONG BOUNDARY IN THE PALM BEACH AREA...AND IN
LOW-LEVEL WARM ADVECTION REGIME ABOVE OUTFLOW EAST OF FORT MYERS.
 GIVEN WEAK LOW-LEVEL FLOW AND RATHER WEAK VERTICAL SHEAR
PROFILES PROSPECTS FOR SIGNIFICANT SEVERE THREAT BEYOND A VERY
ISOLATED DOWNBURST APPEARS LOW NEXT FEW HOURS.



WHILE AGEOSTROPHIC FORCING IN RIGHT ENTRANCE REGION OF UPPER JET
STREAK IS SHIFTING EAST OF THE PENINSULA...DIFLUENT/DIVERGENT
UPPER FLOW FIELD ON TAIL END OF UPSTREAM TROUGH AXIS MAY SUPPORT
CONTINUING EVOLUTION OF CONVECTIVE CLUSTER OFF THE SOUTHWEST
FLORIDA COAST.	GIVEN PRESENCE OF DRY MID-LEVEL ENVIRONMENT
EVIDENT IN 12Z SOUNDINGS FROM KEY WEST AND MIAMI...ANOTHER
SURFACE COLD POOL/MESO HIGH MAY EVOLVE...PROVIDING SOME INCREASE
IN POTENTIAL FOR GUSTY WINDS ACROSS SOUTHERN FLORIDA LATER THIS
AFTERNOON/EVENING.

..KERR.. 03/23/2003

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

ATTN...WFO...MFL...MLB...TBW...

26488190 26838158 27128126 27228090 27418028

Nearby

Mesoscale Discussions in Florida, 2003Every mesoscale discussion in 2003

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.