Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 939

June 10, 20148 counties in Alabama; Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2014, 1:26 PM CDT for 8 counties in Alabama; Jackson County, Mississippi. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 10, 2014, 1:26 PM CDT (18:26 UTC)
Expired: Jun 10, 2014, 3:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Butler County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Jackson County, MS

The radar

The Mobile radar (KMOB), 79 km from the middle of the area, began a volume at 18:28 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, 6.4 hours before the alert went out and 226 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2484 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

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

896 
ACUS11 KWNS 101826
SWOMCD
SPC MCD 101826 
ALZ000-FLZ000-MSZ000-102000-

MESOSCALE DISCUSSION 0939
NWS STORM PREDICTION CENTER NORMAN OK
0126 PM CDT TUE JUN 10 2014

AREAS AFFECTED...SOUTHEAST LA AND EXTREME SOUTHEAST MS TO SOUTHERN
AL

CONCERNING...SEVERE THUNDERSTORM WATCH 274...

VALID 101826Z - 102000Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 274
CONTINUES.

SUMMARY...ISOLATED DAMAGING WIND GUSTS REMAIN POSSIBLE ACROSS
SOUTHEAST LA AND EXTREME SOUTHEAST MS INTO SOUTHERN AL. SEVERE
THUNDERSTORM WATCH 274 CONTINUES UNTIL 00Z.

DISCUSSION...AS OF 1815Z...THE INTEGRITY OF THE PRIMARY COLD
POOL/EASTWARD-ADVANCING SQUALL LINE HAS DIMINISHED OVER THE PAST
HOUR OR SO...LIKELY IN CONJUNCTION WITH WEAKENING LOW-LEVEL
CONVERGENCE AND WEAKER VERTICAL SHEAR WITH EASTWARD EXTENT.
HOWEVER...SOME PRECEDING STORM DEVELOPMENT IS OCCURRING MAINLY
ACROSS SOUTHERN AL AND SOME INTENSIFICATION REMAINS POSSIBLE AHEAD
OF THE RESIDUAL COLD POOL/OUTFLOW. THE DOWNSTREAM AIR MASS ACROSS
FAR SOUTHEAST LA AND SOUTHERN AL/FL PANHANDLE REMAINS MODERATELY
UNSTABLE/WEAKLY INHIBITED WITH MLCAPE AS HIGH AS 2500 J/KG.

..GUYER.. 06/10/2014

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

ATTN...WFO...TAE...BMX...MOB...LIX...

LAT...LON   30458909 31088829 31888749 31888654 31538601 31008621
            30878732 30328773 30458909

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 9, 8:13 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 19 more	92 min
Jun 9, 8:57 PM CDT	Severe Thunderstorm Watch	SPC	DeKalb, Jackson, Madison, Marshall	7 hr
Jun 9, 10:17 PM CDT	Mesoscale Discussion	SPC	Autauga, Blount, Calhoun, Cherokee, Chilton, Clay and 15 more	88 min
Jun 10, 10:10 AM CDT	Mesoscale Discussion	SPC	Choctaw, Clarke, Dallas, Greene, Hale, Marengo and 6 more	65 min
Jun 10, 10:34 AM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Cullman, DeKalb, Etowah, Hale and 12 more	116 min
Jun 10, 10:51 AM CDT	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 35 more	7 hr
Jun 10, 10:58 AM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	8 hr
Jun 10, 1:57 PM CDT	Mesoscale Discussion	SPC	Calhoun, Chambers, Cherokee, Clay, Cleburne, Coosa and 11 more	93 min
Jun 10, 3:03 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Coffee, Conecuh, Covington, Dale and 3 more	87 min
Jun 10, 3:57 PM CDT	Mesoscale Discussion	SPC	Chambers, Randolph	63 min

Nearby

Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.