Alert archive / Florida / Mesoscale Discussions in 2003

Mesoscale Discussion 110

February 21, 2003Baldwin County, Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2003, 2:56 PM CST for Baldwin County, Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Feb 21, 2003, 2:56 PM CST (20:56 UTC)
Expired
Feb 21, 2003, 5:00 PM CST
In force
2 hr
Issued by
the Storm Prediction Center

Counties Baldwin County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 103 km from the middle of the area, began a volume at 20:57 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.9 hours before the alert went out and 247 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, Slidell Radar S, LA at 12:00Z on 2003-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 362 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, Slidell Radar S, LA at 12:00Z on 2003-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 380 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
362 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
469 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
380 m²/s²
0-3 km storm-relative helicity
504 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.4

Open this sounding in Storm Lab

The text

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

975 
ACUS11 KWNS 212057
SWOMCD
SPC MCD 212056 
FLZ000-ALZ000-212300-

MESOSCALE DISCUSSION 0110
NWS STORM PREDICTION CENTER NORMAN OK
0256 PM CST FRI FEB 21 2003

AREAS AFFECTED...WRN FL PANHANDLE

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 212056Z - 212300Z

GUSTY WINDS ARE POSSIBLE WITH CLUSTER OF STORMS AS IT MIGRATES
EAST OF MOBILE BAY INTO THE WESTERN FLORIDA PANHANDLE...BUT ANY
DAMAGING WIND THREAT IS EXPECTED TO BE BRIEF/ISOLATED.



SMALL CONVECTIVE CLUSTER ASSOCIATED WITH REMNANTS OF NOCTURNAL
MCS HAS REINTENSIFIED A BIT THE PAST COUPLE OF HOURS.  BOW ECHO
CONFIGURATION HAS BECOME BETTER DEFINED IN LATEST REFLECTIVITY
LOOPS.	ACTIVITY...HOWEVER...IS OCCURRING ABOVE SURFACE COLD POOL
WHICH APPEARS TO BE ABOUT 1 KM DEEP FROM THE MOBILE BAY AREA INTO
THE WESTERN FLORIDA PANHANDLE.



MID-LEVEL JET STREAK MAY BE PROVIDING FORCING FOR ONGOING
ACTIVITY...BUT MODELS SUGGEST THIS FEATURE WILL WEAKEN/MIGRATE
NORTHEASTWARD...INLAND...AWAY FROM COAST BY EARLY THIS EVENING.
LATEST VAD WIND PROFILES INDICATE ONLY 20 TO 30 KT LOW-LEVEL JET
ABOVE SURFACE COLD POOL...AND THERMODYNAMIC ENVIRONMENT DOES NOT
APPEAR CONDUCIVE TO STRONG DOWNDRAFTS OR PROLONGED DAMAGING WIND
THREAT.

..KERR.. 02/21/2003

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

30358782 30708774 30898737 30938673 30818629 30398636

Nearby

Mesoscale Discussions in Florida, 2003Mesoscale Discussions in Alabama, 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.