Alert archive / Louisiana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 405, NWS Jackson, MS

October 12, 2013Catahoula Parish, Louisiana

NWS Jackson, MS issued this severe thunderstorm warning at Oct 12, 2013, 4:58 PM CDT for Catahoula Parish, Louisiana. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 12, 2013, 4:58 PM CDT (21:58 UTC)
Expired: Oct 12, 2013, 5:45 PM CDT
In force: 47 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

County Catahoula Parish, LA

The radar

The Ft Polk radar (KPOE), 121 km from the middle of the area, began a volume at 22:01 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 12:00Z, 10.0 hours before the alert went out and 182 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: 296 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 602 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jackson, MS wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 12, 4:29 PM CDT, 29 minutes earlier.

Area forecast discussion, Oct 12, 4:29 PM CDT, 29 minutes before

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Hazardous weather outlook, Oct 12, 2:19 PM CDT, 2 hours 39 minutes before

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In the hours before

Special weather statement, Oct 12, 12:46 PM CDT, 4 hours 12 minutes before

ARZ074-075-LAZ007-008-121845-
ASHLEY AR-CHICOT AR-MOREHOUSE LA-WEST CARROLL LA-
1246 PM CDT SAT OCT 12 2013

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1246 PM CDT SAT OCT 12 2013

A STRONG THUNDERSTORM CAPABLE OF PRODUCING PENNY TO NICKEL SIZE HAIL
AND 40 TO 50 MPH WINDS WAS LOCATED 3 MILES WEST OF WILMOT AT 1246 PM
CDT...MOVING EAST AT 15 MPH.

PEOPLE IN SOUTHWESTERN CHICOT AND SOUTHEASTERN ASHLEY COUNTIES...AND
NORTHEASTERN WEST CARROLL AND NORTHEASTERN MOREHOUSE PARISHES SHOULD
MONITOR THIS STORM CLOSELY.

LAT...LON 3318 9170 3310 9121 3301 9124 3300 9127
      3298 9127 3297 9128 3296 9127 3294 9131
      3287 9132 3285 9134 3300 9176
TIME...MOT...LOC 1746Z 286DEG 15KT 3307 9162

DHB

Special weather statement, Oct 12, 1:12 PM CDT, 3 hours 46 minutes before

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Special weather statement, Oct 12, 1:13 PM CDT, 3 hours 45 minutes before

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Special weather statement, Oct 12, 1:53 PM CDT, 3 hours 5 minutes before

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Special weather statement, Oct 12, 2:31 PM CDT, 2 hours 27 minutes before

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Special weather statement, Oct 12, 4:41 PM CDT, 17 minutes before

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The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 12, 1:13 PM CDT	Special Weather Statement	JAN	Washington	62 min
Oct 12, 12:46 PM CDT	Special Weather Statement	JAN	West Carroll	59 min
Oct 12, 12:52 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, West Carroll	38 min
Oct 12, 1:12 PM CDT	Special Weather Statement	JAN	Morehouse	58 min
Oct 12, 1:53 PM CDT	Special Weather Statement	JAN	West Carroll	62 min
Oct 12, 2:31 PM CDT	Special Weather Statement	JAN	Madison	59 min
Oct 12, 4:41 PM CDT	Special Weather Statement	JAN	Catahoula	59 min
Oct 12, 5:29 PM CDT	Severe Thunderstorm Warning	JAN	Concordia	46 min
Oct 12, 11:49 AM CDT	Special Weather Statement	JAN	Ashley	46 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2013 Every severe thunderstorm warning in 2013

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.