Alert archive / Alabama / Mesoscale Discussions in 2016

Mesoscale Discussion 322

April 1, 201611 counties in Alabama; 5 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2016, 2:03 AM CDT for 11 counties in Alabama; 5 counties in Georgia. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 1, 2016, 2:03 AM CDT (07:03 UTC)
Expired
Apr 1, 2016, 3:00 AM CDT
In force
57 min
Issued by
the Storm Prediction Center
Chance of a watch
40%

Counties Autauga County, AL, Bullock County, AL, Dallas County, AL, Elmore County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Russell County, AL, Tallapoosa County, AL, Wilcox County, AL, Chattahoochee County, GA, Harris County, GA, Marion County, GA, Muscogee County, GA, Stewart County, GA

The radar

The Maxwell AFB radar (KMXX), 14 km from the middle of the area, began a volume at 07:06 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

Birmingham, AL (KBMX), launched 00:00Z, 7.1 hours before the alert went out and 116 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, Birmingham, AL at 00:00Z on 2016-04-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 693 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, Birmingham, AL at 00:00Z on 2016-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 294 square meters per square second.1939587897117Sfc1 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
693 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
764 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
294 m²/s²
0-3 km storm-relative helicity
366 m²/s²
Significant tornado parameter
1.2
Supercell composite
6.4

Open this sounding in Storm Lab

The text

As transmitted.

507 
ACUS11 KWNS 010703
SWOMCD
SPC MCD 010703 
GAZ000-ALZ000-010800-

MESOSCALE DISCUSSION 0322
NWS STORM PREDICTION CENTER NORMAN OK
0203 AM CDT FRI APR 01 2016

AREAS AFFECTED...S-CNTRL AL / W-CNTRL GA

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 010703Z - 010800Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...AN ISOLATED RISK FOR DAMAGING WINDS AND PERHAPS A TORNADO
--ALBEIT LOW BUT NONZERO-- WILL SEEMINGLY EXIST OVERNIGHT AND
DOWNSTREAM OF INTENSIFYING STORMS IN SWRN AND CNTRL AL INVOF A
WEST-TO-EAST ORIENTED OUTFLOW BOUNDARY.

DISCUSSION...SURFACE OBSERVATIONS OVER S-CNTRL AL INDICATE AN
OUTFLOW BOUNDARY FROM EARLIER ACTIVITY IN GA IS ORIENTED WEST TO
EAST ACROSS S-CNTRL AL.  TO THE SOUTH OF THE BOUNDARY...LOWER 70S
TEMPS AND UPPER 60S TO NEAR 70 DEG F DEWPOINTS INDICATE THE MARITIME
AIRMASS IS SLOW TO STABILIZE ACROSS THE REGION.  WHILE IT SEEMS ONLY
ISOLATED/LOCALIZED WIND DAMAGE/SMALL HAIL ARE THE THREATS WITH A
STRONGER STORM OR TWO AT THIS TIME...STORM ORGANIZATION AND FURTHER
INTENSIFICATION ARE POSSIBLE.  GIVEN THE STRONG TROPOSPHERIC FLOW
ACROSS THE DISCUSSION AREA /REFERENCE KMXX VAD DATA/...THE
CONSIDERATION FOR AN ADDITIONAL WATCH MAY BE NEEDED IF STORM
INTENSIFICATION TRENDS CONTINUE.

..SMITH/EDWARDS.. 04/01/2016

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

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

LAT...LON   32958495 32798665 32548729 32098757 31828697 32088450
            32368427 32958495

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 31, 7:41 PM CDTMesoscale DiscussionSPCCalhoun, Chambers, Cherokee, Clay, Cleburne, DeKalb and 6 more94 min
Mar 31, 8:14 PM CDTTornado WatchSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 8 more18 hr
Mar 31, 10:11 PM CDTMesoscale DiscussionSPCAutauga, Bullock, Calhoun, Chambers, Cherokee, Chilton and 14 more64 min
Apr 1, 4:46 AM CDTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Crenshaw, Dale, Henry and 2 more89 min
Apr 1, 6:26 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston12 hr
Apr 1, 10:40 AM CDTMesoscale DiscussionSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 2 more2 hr
Apr 1, 1:00 PM CDTMesoscale DiscussionSPCHenry, Houston60 min
Mar 31, 7:09 PM CDTMesoscale DiscussionSPCBrooks, Colquitt, Cook, Decatur, Grady, Lowndes and 3 more96 min
Apr 1, 12:31 AM CDTMesoscale DiscussionSPCBaldwin, Bleckley, Burke, Columbia, Dodge, Elbert and 18 more89 min
Apr 1, 1:48 PM CDTTornado WatchSPCAppling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 50 more6 hr
Apr 1, 4:40 PM CDTMesoscale DiscussionSPCBrantley, Bryan, Camden, Charlton, Chatham, Clinch and 9 more65 min

Nearby

Mesoscale Discussions in Alabama, 2016Mesoscale Discussions in Georgia, 2016Every mesoscale discussion in 2016

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.