Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 293, NWS Jackson, MS

May 30, 2012Catahoula Parish, Franklin Parish, Louisiana

NWS Jackson, MS issued this severe thunderstorm warning at May 30, 2012, 4:30 PM CDT for Catahoula Parish, Franklin Parish, Louisiana. It was in force for 17 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 30, 2012, 4:30 PM CDT (21:30 UTC)
Expired: May 30, 2012, 4:47 PM CDT
In force: 17 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Catahoula Parish, LA, Franklin Parish, LA

The radar

The Jackson/Brandon,MS radar (KDGX), 151 km from the middle of the area, began a volume at 21:33 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.

What was reported inside it

Time	Report	Where	Remark
May 30, 4:35 PM CDT	TSTM WND DMG	Nw Jigger, LA	REPORTS OF A FEW POWERLINES DOWN ON HIGHWAY 128 NEAR FORT NECESSITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 9.5 hours before the alert went out and 143 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: 1192 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1334 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: -4 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.

386 
WUUS54 KJAN 302130
SVRJAN
LAC025-041-302200-
/O.NEW.KJAN.SV.W.0293.120530T2130Z-120530T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
430 PM CDT WED MAY 30 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CATAHOULA PARISH IN NORTHEAST LOUISIANA...
  SOUTHERN FRANKLIN PARISH IN NORTHEAST LOUISIANA...

* UNTIL 500 PM CDT

* AT 430 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
  JIGGER MOVING EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WISNER BY 455 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT
WEDNESDAY EVENING FOR SOUTHEAST ARKANSAS AND NORTHEAST LOUISIANA AND
NORTHERN MISSISSIPPI.

&&

LAT...LON 3213 9151 3210 9151 3209 9149 3207 9149
      3206 9150 3202 9151 3200 9150 3196 9153
      3195 9151 3193 9151 3189 9157 3189 9183
      3207 9185
TIME...MOT...LOC 2130Z 264DEG 9KT 3199 9173

$$

GRG

1 follow-up statement

877 
WWUS54 KJAN 302147
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
447 PM CDT WED MAY 30 2012

LAC025-041-302157-
/O.CAN.KJAN.SV.W.0293.000000T0000Z-120530T2200Z/
FRANKLIN LA-CATAHOULA LA-
447 PM CDT WED MAY 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CATAHOULA AND 
SOUTHERN FRANKLIN PARISHES IS CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS WEAKENED
BELOW SEVERE LIMITS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM CDT
WEDNESDAY EVENING FOR SOUTHEAST ARKANSAS AND NORTHEAST LOUISIANA AND
NORTHERN MISSISSIPPI.

LAT...LON 3213 9151 3210 9151 3209 9149 3207 9149
      3206 9150 3202 9151 3200 9150 3196 9153
      3195 9151 3193 9151 3189 9157 3189 9183
      3207 9185
TIME...MOT...LOC 2147Z 264DEG 9KT 3199 9168

$$

GRG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 2:54 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll	66 min
May 30, 3:55 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll, Madison	50 min
May 30, 4:23 PM CDT	Flash Flood Warning	JAN	East Carroll, Madison	2 hr
May 30, 4:53 PM CDT	Severe Thunderstorm Warning	JAN	Madison	67 min
May 30, 4:57 PM CDT	Severe Thunderstorm Warning	JAN	Madison, Tensas	48 min
May 30, 5:28 PM CDT	Flash Flood Warning	JAN	Madison, Tensas	2 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.