Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 252, NWS Jackson, MS

May 21, 2012Morehouse Parish, Louisiana; Ashley County, Arkansas

NWS Jackson, MS issued this severe thunderstorm warning at May 21, 2012, 4:50 PM CDT for Morehouse Parish, Louisiana; Ashley County, Arkansas. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 21, 2012, 4:50 PM CDT (21:50 UTC)
Expired: May 21, 2012, 5:15 PM CDT
In force: 25 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Ashley County, AR, Morehouse Parish, LA

The radar

The Shreveport radar (KSHV), 180 km from the middle of the area, began a volume at 21:51 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, 9.8 hours before the alert went out and 207 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: 518 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1663 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 14 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.

412 
WUUS54 KJAN 212150
SVRJAN
ARC003-LAC067-212215-
/O.NEW.KJAN.SV.W.0252.120521T2150Z-120521T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
450 PM CDT MON MAY 21 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MOREHOUSE PARISH IN NORTHEAST LOUISIANA...
  SOUTHWESTERN ASHLEY COUNTY IN SOUTHEAST ARKANSAS...
  THIS INCLUDES THE CITIES OF...WEST CROSSETT...CROSSETT...

* UNTIL 515 PM CDT

* AT 450 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  WEST CROSSETT MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WEST CROSSETT BY 500 PM CDT...
  CROSSETT BY 510 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WINDS OF 60 MPH CAN BRING DOWN TREES...POSSIBLY RESULTING IN INJURY
AND PROPERTY DAMAGE. ROOFS OF MOBILE HOMES AND OUTBUILDINGS COULD BE
DAMAGED...AND MINOR ROOF DAMAGE TO WELL BUILT HOMES AND STRUCTURES
COULD OCCUR.

&&

LAT...LON 3321 9214 3322 9209 3323 9210 3327 9205
      3302 9182 3289 9204 3297 9209 3301 9208
      3303 9212 3306 9212 3308 9214 3315 9211
      3317 9214
TIME...MOT...LOC 2150Z 326DEG 17KT 3316 9209

$$

EEC

1 follow-up statement

178 
WWUS54 KJAN 212200
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
500 PM CDT MON MAY 21 2012

ARC003-LAC067-212215-
/O.CON.KJAN.SV.W.0252.000000T0000Z-120521T2215Z/
ASHLEY AR-MOREHOUSE LA-
500 PM CDT MON MAY 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHWESTERN ASHLEY COUNTY...AND NORTHWESTERN MOREHOUSE PARISH...

AT 500 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR WEST
CROSSETT MOVING SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CROSSETT BY 510 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WINDS OF 60 MPH CAN BRING DOWN TREES...POSSIBLY RESULTING IN INJURY
AND PROPERTY DAMAGE. ROOFS OF MOBILE HOMES AND OUTBUILDINGS COULD BE
DAMAGED...AND MINOR ROOF DAMAGE TO WELL BUILT HOMES AND STRUCTURES
COULD OCCUR.

&&

LAT...LON 3321 9214 3322 9209 3323 9210 3327 9205
      3302 9182 3289 9204 3297 9209 3301 9208
      3303 9212 3306 9212 3308 9214 3315 9211
      3317 9214
TIME...MOT...LOC 2200Z 326DEG 17KT 3312 9206

$$

EEC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 3:17 PM CDT	Severe Thunderstorm Warning	JAN	Concordia, Tensas	43 min
May 21, 3:33 PM CDT	Severe Thunderstorm Warning	JAN	Madison	27 min
May 21, 3:50 PM CDT	Severe Thunderstorm Warning	JAN	Madison	40 min
May 21, 4:01 PM CDT	Special Weather Statement	JAN	Richland	29 min
May 21, 4:52 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Franklin	38 min
May 21, 5:04 PM CDT	Severe Thunderstorm Warning	JAN	Madison	26 min
May 21, 5:14 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse	31 min
May 21, 5:31 PM CDT	Special Weather Statement	JAN	Franklin	29 min
May 21, 5:34 PM CDT	Special Weather Statement	JAN	Madison	31 min
May 21, 5:55 PM CDT	Special Weather Statement	JAN	Concordia	30 min
May 21, 5:57 PM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	12 min
May 21, 6:13 PM CDT	Special Weather Statement	JAN	Concordia	32 min
May 21, 6:37 PM CDT	Special Weather Statement	JAN	Richland	33 min
May 21, 6:44 PM CDT	Severe Thunderstorm Warning	JAN	Morehouse, Richland, West Carroll	46 min
May 21, 6:55 PM CDT	Special Weather Statement	JAN	Avoyelles	30 min
May 21, 4:31 PM CDT	Severe Thunderstorm Warning	JAN	Chicot	25 min
May 21, 4:41 PM CDT	Special Weather Statement	JAN	Ashley	19 min
May 21, 5:54 PM CDT	Special Weather Statement	JAN	Ashley	21 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2012 Severe Thunderstorm Warnings in Arkansas, 2012 Every severe thunderstorm warning 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.