Alert archive / Louisiana / Mesoscale Discussions in 2006

Mesoscale Discussion 49

January 13, 20067 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 13, 2006, 4:00 AM CST for 7 parishes in Louisiana; 5 counties in Mississippi. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jan 13, 2006, 4:00 AM CST (10:00 UTC)
Expired: Jan 13, 2006, 5:00 AM CST
In force: 60 min
Issued by: the Storm Prediction Center

Counties Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Tensas Parish, LA, Adams County, MS, Claiborne County, MS, Issaquena County, MS, Sharkey County, MS, Warren County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 145 km from the middle of the area, began a volume at 10:03 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, 10.0 hours before the alert went out and 137 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 142 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 131001
SWOMCD
SPC MCD 131000 
MSZ000-LAZ000-131100-

MESOSCALE DISCUSSION 0049
NWS STORM PREDICTION CENTER NORMAN OK
0400 AM CST FRI JAN 13 2006

AREAS AFFECTED...NERN LA AND EXTREME WCNTRL MS

CONCERNING...TORNADO WATCH 14...

VALID 131000Z - 131100Z

FAST MOVING LINE OF TSTMS HAS MOVED EAST OF THE MS RVR NORTH OF
ABOUT VICKSBURG AND WILL CROSS INTO SWRN MS FROM NERN LA SOUTH OF
THAT LATITUDE BY 11Z.  AS A RESULT...THE SEVERE THREAT IN WT 14 WILL
END.  UNTIL THEN...TSTMS CONTINUE TO INTENSIFY ACROSS NERN LA AND
WRN MS AS UPSTREAM JET STREAK BEGINS TO TRANSLATE TOWARD THE LWR MS
VLY.  LATEST RADAR TRENDS SUGGEST THAT THE TSTM LINE SEGMENT
APPROACHING AREAS N AND W OF NATCHEZ MS IS BOWING AND MAY PRODUCE
DAMAGING WIND GUSTS AND PERHAPS A TORNADO.  EXTRAPOLATION HAS THIS
CELL INTO WT 16 BY 11Z.

..RACY.. 01/13/2006

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

ATTN...WFO...JAN...LCH...SHV...

31529259 33099093 32729051 32039080 31299155

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 12, 6:53 PM CST	Tornado Watch	SPC	Bossier, Caddo, De Soto, Red River, Webster	7 hr
Jan 12, 9:52 PM CST	Mesoscale Discussion	SPC	Bossier, Caddo, Webster	83 min
Jan 12, 11:10 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	95 min
Jan 12, 11:48 PM CST	Tornado Watch	SPC	Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 15 more	6 hr
Jan 13, 1:08 AM CST	Mesoscale Discussion	SPC	Bossier, Webster	37 min
Jan 13, 1:47 AM CST	Mesoscale Discussion	SPC	East Baton Rouge, East Feliciana, Livingston, Saint Helena, Saint Tammany, Tangipahoa and 2 more	88 min
Jan 13, 2:14 AM CST	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, East Baton Rouge and 28 more	8 hr
Jan 13, 5:20 AM CST	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Avoyelles, Concordia, East Baton Rouge and 22 more	85 min
Jan 13, 7:11 AM CST	Tornado Watch	SPC	George, Greene, Harrison, Jackson, Perry, Stone and 1 more	7 hr

Nearby

Mesoscale Discussions in Louisiana, 2006 Mesoscale Discussions in Mississippi, 2006 Every mesoscale discussion in 2006

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.