Alert archive / Mississippi / Mesoscale Discussions in 2012

Mesoscale Discussion 191

February 29, 2012East Carroll Parish, Madison Parish, Louisiana; 14 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 29, 2012, 7:01 PM CST for East Carroll Parish, Madison Parish, Louisiana; 14 counties in Mississippi. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Feb 29, 2012, 7:01 PM CST (01:01 UTC)
Expired: Feb 29, 2012, 8:00 PM CST
In force: 59 min
Issued by: the Storm Prediction Center

Counties East Carroll Parish, LA, Madison Parish, LA, Attala County, MS, Choctaw County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leake County, MS, Madison County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Sharkey County, MS, Warren County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 60 km from the middle of the area, began a volume at 01:02 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.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 1.0 hours before the alert went out and 55 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: 263 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1272 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

714 
ACUS11 KWNS 010102
SWOMCD
SPC MCD 010101
MSZ000-LAZ000-010200-

MESOSCALE DISCUSSION 0191
NWS STORM PREDICTION CENTER NORMAN OK
0701 PM CST WED FEB 29 2012

AREAS AFFECTED...FAR NORTHEAST LA/CENTRAL MS

CONCERNING...SEVERE THUNDERSTORM WATCH 51...

VALID 010101Z - 010200Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 51
CONTINUES.

SEVERE TSTM WATCH 51 REMAINS IN EFFECT UNTIL 03Z...BUT THE SEVERE
THREAT SHOULD REMAIN LIMITED/ISOLATED THE REMAINDER OF THE EVENING.

WITHIN A BAND OF PRE-FRONTAL CONFLUENCE...TSTMS PERSIST IN A ENE-WSW
ORIENTED CORRIDOR MAINLY ACROSS EAST-CENTRAL MS. WANING LOW-LEVEL
CONVERGENCE AND A MODEST POST-SUNSET COOLING OF AN OTHERWISE
RELATIVELY MOIST /LOWER 60S F SURFACE DEWPOINTS/ BOUNDARY LAYER...IN
ADDITION TO A WARM/POOR LAPSE RATE LAYER BETWEEN 800-600 MB PER THE
00Z JACKSON OBSERVED SOUNDING...SHOULD RESULT IN A TEMPERED SEVERE
THREAT THE REMAINDER OF THE EVENING. IN SPITE OF THESE THERMODYNAMIC
TRENDS...ROBUST VERTICAL SHEAR DOES PERSIST SUCH THAT A DAMAGING
WIND/BRIEF TORNADO THREAT REMAINS BUT ON AN INCREASINGLY LIMITED
BASIS.

..GUYER.. 03/01/2012

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

ATTN...WFO...JAN...

LAT...LON   32549189 33209051 33538854 33108839 32948842 32558949
            32109134 32549189

Nearby

Mesoscale Discussions in Mississippi, 2012 Mesoscale Discussions in Louisiana, 2012 Every mesoscale discussion in 2012

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.