Mesoscale Discussion 327

Issued

Mar 22, 2012, 1:00 PM CDT (18:00 UTC)

Expired

Mar 22, 2012, 2:00 PM CDT

In force

60 min

Issued by

the Storm Prediction Center

Counties Autauga County, AL, Baldwin County, AL, Bibb County, AL, Butler County, AL, Chilton County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Monroe County, AL, Perry County, AL, Shelby County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The Birmingham radar (KBMX), 144 km from the middle of the area, began a volume at 18:02 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.

034 
ACUS11 KWNS 221801
SWOMCD
SPC MCD 221800
ALZ000-FLZ000-221900-

MESOSCALE DISCUSSION 0327
NWS STORM PREDICTION CENTER NORMAN OK
0100 PM CDT THU MAR 22 2012

AREAS AFFECTED...CNTRL/SWRN AL...FAR WRN FL PANHANDLE

CONCERNING...TORNADO WATCH 100...

VALID 221800Z - 221900Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 100 CONTINUES.

SEVERE THREAT WILL LIKELY REMAIN LIMITED AND PRIMARILY CONSIST OF
LOCALLY DAMAGING WINDS AS THE TORNADO THREAT DIMINISHES THIS
AFTERNOON. UNLESS SUBSTANTIAL INTENSIFICATION OF THE NNE-SSW
ORIENTED CONVECTIVE BAND OCCURS FROM PORTIONS OF CNTRL TO SWRN
AL...DOWNSTREAM WW ISSUANCE MAY NOT BE NECESSARY.

RADAR IMAGERY INDICATES THE BASE REFLECTIVITY GRADIENT AND CORES AT
7-9 KM MSL HAVE GENERALLY WEAKENED DURING THE PAST HOUR IN
ASSOCIATION WITH A DIFFUSE CONVECTIVE BAND ACROSS WRN AL.
METAR/MESONET OBSERVATIONS CONFIRM THAT UPPER 60S SURFACE DEW POINTS
REMAIN CONFINED TO THE FL/AL BORDER LATITUDE WHERE LOW-LEVEL SLYS
HAVE BEGUN WEAKENING. THIS IS ILLUSTRATED IN THE MOB VAD WIND
PROFILE WITH 1 KM AGL SLYS FROM 45 KT AT 1515Z TO 30 KT AT 1745Z. AS
SUCH POTENTIAL FOR A BRIEF TORNADO APPEARS TO BE DIMINISHING.

AIR MASS ACROSS CNTRL AL HAS DESTABILIZED AS TEMPERATURES HAVE
WARMED INTO THE LOWER 80S. A RISK FOR DAMAGING WINDS MAY EXTEND N/E
OF WW 100...BUT BASED ON THE INCREASINGLY DISORGANIZED NATURE OF THE
CONVECTIVE BAND AND WEAKER DEEP-LAYER SHEAR...THIS THREAT SHOULD
REMAIN RATHER LOCALIZED.

..GRAMS.. 03/22/2012

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

ATTN...WFO...BMX...MOB...

LAT...LON   30168834 31258789 32178755 32818747 33488703 33558664
            33438645 33118623 32468617 30458658 30168768 30168834

Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Florida, 2012Every mesoscale discussion in 2012

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.