Alert archive / Louisiana / Special Weather Statements in 2012

Special Weather Statement, NWS Jackson, MS

August 31, 2012Catahoula Parish, Franklin Parish, Louisiana

NWS Jackson, MS issued this special weather statement at Aug 31, 2012, 6:24 AM CDT for Catahoula Parish, Franklin Parish, Louisiana. It was in force for 61 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: Aug 31, 2012, 6:24 AM CDT (11:24 UTC)
Expired: Aug 31, 2012, 7:25 AM CDT
In force: 61 min
Issued by: NWS Jackson, MS

Counties Catahoula Parish, LA, Franklin Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 11.4 hours before the alert went out and 172 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: 42 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 319 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 31, 4:00 AM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Aug 31, 4:00 AM CDT, 2 hours 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON MS
400 AM CDT FRI AUG 31 2012

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT...TROPICAL DEPRESSION
ISAAC WILL CONTINUE TO LIFT NORTH ACROSS CENTRAL AND NORTH
ARKANSAS...AND INTO MISSOURI TODAY.  LOW LEVEL MOISTURE WILL
CONTINUE TO SURGE NORTHWARD OVER THE CWA IN HIS WAKE CAUSING BANDS
OF SHOWERS...ALONG WITH AN EMBEDDED THUNDERSTORM OR TWO...TO
CONTINUE TO ALSO MOVE NORTHWARD OVER THE FORECAST AREA TODAY.

JUST AS WE SAW ON THURSDAY...THERE WILL BE THE POTENTIAL FOR A FEW
TORNADOES TO SPIN UP IN CONVECTION THROUGH THE DAY.  THIS AS A
RESULT OF ADEQUATE WIND SHEAR OVER THE FORECAST AREA.  A LIMITING
FACTOR THOUGH WILL BE INSTABILITY.  WHILE IT WILL BE LIMITED...
MID/UPPER LEVEL DRIER AIR SPREADING OVER THE REGION COULD CAUSE SOME
BREAKS IN THE CLOUDS TODAY.  IF THIS OCCURS...IT WILL ALLOW FOR
BETTER DAYTIME HEATING...THUS INCREASING INSTABILITY OVER THE
FORECAST AREA...AND AIDING IN THE DEVELOPMENT OF CONVECTION.  WHILE
CONFIDENCE IN THIS IS LOW...I WILL MENTION THIS POTENTIAL IN THE HWO.

DECENT RAIN CHANCES WILL REMAIN OVER THE FORECAST AREA TONIGHT...
THROUGH SATURDAY...AND INTO SATURDAY NIGHT AS TROUGHING BEGINS TO
SET UP OVER THE MUCH OF THE EASTERN UNITED STATES.  THE BEST RAIN
CHANCES DURING THAT PERIOD WILL FALL ON SATURDAY AFTERNOON.  HIGHS
SATURDAY WILL WARM UP AROUND 90...COMBINING WITH THE ABUNDANCE OF
MOISTURE OVER THE AREA.  THIS WILL HELP TO AGAIN SPARK SHOWERS AND
STORMS OVER THE CWA.  ACTIVITY WILL LESSEN DURING THE OVERNIGHT
HOURS EACH NIGHT AS LOWS REMAIN MILD AND ONLY FALL INTO THE MIDDLE
70S. /19/

.LONG TERM...SUNDAY THROUGH FRIDAY...SUNDAY MORNING THE REMNANTS OF
ISAAC ARE EXPECTED TO BE OVER THE MID MISSISSIPPI VALLEY WITH
ASSOCIATED TROUGHING STILL SAGGING INTO NORTHERN MISSISSIPPI. RIDGES
SURFACE AND ALOFT WILL BE ACROSS THE SOUTHEAST STATES NOSING ACROSS
THE SOUTHERN PORTIONS OF OUR CWA. A VERY MOIST AIRMASS WILL STILL BE
IN PLACE OVER OUR CWA WITH PWS ABOVE TWO INCHES. THIS COMBINED WITH
DAYTIME HEATING SHOULD RESULT IN SCATTERED STORMS DURING THE
AFTERNOON AND EVENING ACROSS MUCH OF THE AREA. MONDAY THE REMNANTS
OF ISAAC WILL MOVE FURTHER AWAY FROM OUR CWA AND OVER THE OHIO
VALLEY WITH FLAT RIDGING ALOFT FROM THE SOUTHERN PLAINS TRYING TO
SPREAD OVER OUR AREA. SURFACE RIDGING WILL SHIFT TO THE NORTHERN
GULF HELPING TO MAINTAIN OUR WARM MOIST AIRMASS. NORMAL HIGHS RUN IN
THE UPPER 80S WHILE LOWS RUN IN THE MID TO UPPER 60S. ABOVE NORMAL
TEMPERATURES ARE EXPECTED SUNDAY AND WILL CONTINUE THROUGH MUCH OF
NEXT WEEK. HIGHS SUNDAY AND MONDAY LOOK TO TOP OUT IN THE LOWER 90S
AT MOST SITE. OVERNIGHT LOWS WILL REMAIN IN THE 70S. MID LEVEL
RIDGING FROM THE PLAINS WILL EDGE OVER OUR WESTERN ZONES THROUGH
THURSDAY WHILE TROUGHING DEEPENS OVER THE SOUTHEAST STATES. THIS
WILL RESULT IN LOWER DAILY POPS BEING CARRIED IN OUR WEST WITH
GREATEST POPS GENERALLY OVER THE EAST. AS A RESULT HIGHEST
TEMPERATURES WILL BE IN THE WEST AS WELL WHERE AFTERNOON HIGHS WILL
REACH THE MID 90S TUESDAY AND WEDNESDAY. BOTH GFS AND ECMWF SHOW A
DECENT SHORTWAVE ACROSS THE NORTHERN PLAINS AND GREAT LAKES REGION
THURSDAY INTO FRIDAY. THE GFS IS DEEPER THAN THE ECMWF WITH THE
TROUGHING BY FRIDAY AND DRIVES AN ASSOCIATED COLD FRONT ACROSS OUR
CWA. THE ECMWF HANGS THE FRONT UP NORTH OF MISSISSIPPI. WL LEAN
TOWARD A SLOWER FROPA AND KEEP CHANCE POPS ACROSS THE CWA FRIDAY.
CLOUDS AND RAIN CHANCES WILL HOLD TEMPERATURES DOWN FRIDAY. /22/

&&

.AVIATION...A MIX OF VFR/MVFR CEILINGS WILL BE OBSERVED AT TAF SITES
THROUGH THE PERIOD.  SOUTH TO SOUTHEASTERLY WINDS WILL REMAIN BREEZY
THROUGH THE DAY DUE TO THE TIGHT PRESSURE GRADIENT REMAINING OVER
THE REGION AS TROPICAL STORM ISAAC CONTINUES LIFTING OUT TO THE
NORTH OVER ARKANSAS AND INTO MISSOURI.  THROUGH THE FORECAST
PERIOD...PARTICULARLY THIS AFTERNOON INTO EARLY THIS EVENING...
SCATTERED CONVECTION COULD CAUSE A DEGRADATION IN BOTH CEILINGS AND
VISIBILITIES MAKING PERIODS OF IFR FLIGHT CATEGORIES POSSIBLE IF
OBSERVED WITHIN AERODROMES. /19/

&&

.PRELIMINARY POINT TEMPS/POPS...
JACKSON       88  73  90  74 /  54  32  51  37
MERIDIAN      88  73  91  73 /  53  33  56  50
VICKSBURG     88  75  91  74 /  51  31  45  26
HATTIESBURG   90  75  93  74 /  62  22  49  35
NATCHEZ       88  74  91  75 /  51  19  54  30
GREENVILLE    88  74  91  74 /  79  42  41  21
GREENWOOD     88  74  90  75 /  56  39  48  31

&&

.JAN WATCHES/WARNINGS/ADVISORIES...
MS...NONE.
LA...NONE.
AR...NONE.
&&

19/22/19

Hazardous weather outlook, Aug 31, 4:46 AM CDT, 1 hour 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
446 AM CDT FRI AUG 31 2012

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
011000-
ASHLEY-CHICOT-MOREHOUSE-WEST CARROLL-EAST CARROLL-RICHLAND-
MADISON LA-FRANKLIN LA-CATAHOULA-TENSAS-CONCORDIA-BOLIVAR-
SUNFLOWER-LEFLORE-GRENADA-CARROLL-MONTGOMERY-WEBSTER-CLAY-LOWNDES-
CHOCTAW-OKTIBBEHA-WASHINGTON-HUMPHREYS-HOLMES-ATTALA-WINSTON-
NOXUBEE-ISSAQUENA-SHARKEY-YAZOO-MADISON MS-LEAKE-NESHOBA-KEMPER-
WARREN-HINDS-RANKIN-SCOTT-NEWTON-LAUDERDALE-CLAIBORNE-COPIAH-
SIMPSON-SMITH-JASPER-CLARKE-JEFFERSON-ADAMS-FRANKLIN MS-LINCOLN-
LAWRENCE-JEFFERSON DAVIS-COVINGTON-JONES-MARION-LAMAR-FORREST-
446 AM CDT FRI AUG 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL MISSISSIPPI...
NORTHEAST LOUISIANA...AND EXTREME SOUTHEAST ARKANSAS.

.DAY ONE...TODAY AND TONIGHT...

THE POTENTIAL FOR SOME TORNADOES WILL EXIST ACROSS THE OUTLOOK AREA
FROM THIS MORNING THROUGH EARLY THIS EVENING. ADEQUATE WIND
SHEAR...COMBINED WITH DAYTIME HEATING...RESULTING IN SUFFICIENT
INSTABILITY...WILL CAUSE STORMS TO DEVELOP OVER THE AREA...SOME OF
WHICH COULD PRODUCE TORNADOES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER CALL TO ACTION STATEMENT...
THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL IN SUPPORT OF SEVERE WEATHER
OPERATIONS MAY BE NEEDED TODAY THROUGH EARLY THIS EVENING.

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.SRH.NOAA.GOV/JAN.

19

In the hours before

Special weather statement, Aug 31, 1:36 AM CDT, 4 hours 48 minutes before

MSZ043-048-049-310705-
RANKIN MS-MADISON MS-HINDS MS-
136 AM CDT FRI AUG 31 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
136 AM CDT FRI AUG 31 2012

A STRONG TROPICAL SHOWER CAPABLE OF PRODUCING 30 TO 40 MPH WINDS WAS
LOCATED 7 MILES NORTHWEST OF CATO AT 136 AM CDT...MOVING NORTH AT 40
MPH.

HEAVY RAIN IS ALSO POSSIBLE WITH THIS TROPICAL BAND.

PEOPLE IN EXTREME NORTHEASTERN HINDS...SOUTHEASTERN MADISON AND
CENTRAL RANKIN COUNTIES SHOULD MONITOR THIS STORM CLOSELY.

LAT...LON 3207 9007 3270 9011 3273 9007 3267 8973
      3264 8973 3260 8978 3249 8976 3207 8988
TIME...MOT...LOC 0636Z 197DEG 34KT 3219 8995

JA

Special weather statement, Aug 31, 2:19 AM CDT, 4 hours 5 minutes before

LAZ024-026-310750-
CONCORDIA LA-CATAHOULA LA-
219 AM CDT FRI AUG 31 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
219 AM CDT FRI AUG 31 2012

A LINE OF STRONG STORMS CAPABLE OF PRODUCING 40 TO 50 MPH WINDS WAS
LOCATED FROM 3 MILES SOUTHEAST OF ENTERPRISE TO 13 MILES WEST OF
LARTO AT 219 AM CDT...MOVING NORTHEAST AT 35 MPH.

VERY HEAVY RAIN IS ALSO POSSIBLE WITH THESE STORMS.

PEOPLE IN CATAHOULA AND NORTHERN CONCORDIA PARISHES SHOULD MONITOR
THESE STORMS CLOSELY.

LAT...LON 3177 9202 3189 9199 3192 9183 3188 9178
      3187 9178 3188 9173 3196 9164 3197 9160
      3189 9160 3186 9157 3180 9158 3177 9156
      3175 9152 3160 9153 3140 9179 3129 9202
TIME...MOT...LOC 0719Z 218DEG 29KT 3190 9182 3161 9183
          3139 9210

JA

Local storm report, Aug 31, 3:15 AM CDT, 3 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
315 AM CDT FRI AUG 31 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     NON-TSTM WND DMG 1 E GREENVILLE          33.38N 91.04W
08/30/2012                   WASHINGTON         MS   BROADCAST MEDIA

            TREE DOWNED ALONG OLLIE CIRCLE

&&

DL

Special weather statement, Aug 31, 4:12 AM CDT, 2 hours 12 minutes before

LAZ023>025-311010-
TENSAS LA-FRANKLIN LA-CATAHOULA LA-
412 AM CDT FRI AUG 31 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
412 AM CDT FRI AUG 31 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING 40 TO 50 MPH WINDS WAS
LOCATED 3 MILES EAST OF SHERWOOD AT 412 AM CDT...MOVING NORTHEAST AT
35 MPH.

VERY HEAVY RAIN IS ALSO POSSIBLE WITH THIS STORM.

PEOPLE IN NORTHERN CATAHOULA...SOUTHERN FRANKLIN AND EXTREME WEST
CENTRAL TENSAS PARISHES SHOULD MONITOR THIS STORM CLOSELY.

LAT...LON 3193 9191 3197 9190 3203 9191 3219 9167
      3214 9152 3195 9151 3173 9189 3193 9200
TIME...MOT...LOC 0912Z 225DEG 31KT 3186 9188

MME

Special weather statement, Aug 31, 6:24 AM CDT, 0 minutes before

LAZ023-024-311225-
FRANKLIN LA-CATAHOULA LA-
624 AM CDT FRI AUG 31 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
624 AM CDT FRI AUG 31 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING 40 TO 50 MPH WINDS WAS
LOCATED 3 MILES SOUTH OF MANIFEST AT 624 AM CDT...MOVING NORTHEAST AT
30 MPH.

VERY HEAVY RAIN IS ALSO POSSIBLE WITH THIS STORM.

PEOPLE IN NORTHWESTERN CATAHOULA AND SOUTHERN FRANKLIN PARISHES
SHOULD MONITOR THIS STORM CLOSELY.

LAT...LON 3188 9201 3194 9199 3193 9191 3199 9190
      3207 9193 3209 9192 3210 9188 3215 9189
      3216 9149 3210 9151 3209 9149 3164 9177
      3162 9181 3156 9182 3147 9187 3151 9201
TIME...MOT...LOC 1124Z 209DEG 28KT 3171 9193

MME

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 7:41 PM CDT	Special Weather Statement	JAN	Rankin, Simpson	59 min
Aug 30, 8:01 PM CDT	Special Weather Statement	JAN	Jasper	29 min
Aug 30, 8:10 PM CDT	Tornado Warning	JAN	Jasper	50 min
Aug 30, 8:23 PM CDT	Tornado Warning	JAN	Covington, Jasper, Jones, Smith	37 min
Aug 30, 8:29 PM CDT	Areal Flood Warning	JAN	Bolivar, Washington	12 hr
Aug 30, 8:35 PM CDT	Flash Flood Watch	JAN	Adams, Claiborne, Clarke, Copiah, Covington, Forrest and 20 more	4 hr
Aug 30, 8:48 PM CDT	Tornado Warning	JAN	Jefferson Davis, Lawrence, Marion	42 min
Aug 30, 8:48 PM CDT	Tornado Warning	JAN	Newton	45 min
Aug 30, 9:03 PM CDT	Flash Flood Warning	JAN	Jefferson Davis, Lawrence, Marion	117 min
Aug 30, 9:29 PM CDT	Tornado Warning	JAN	Neshoba	46 min
Aug 30, 9:39 PM CDT	Special Weather Statement	JAN	Rankin	31 min
Aug 30, 10:07 PM CDT	Tornado Warning	JAN	Attala, Choctaw, Winston	32 min
Aug 31, 1:36 AM CDT	Special Weather Statement	JAN	Madison, Rankin	29 min
Aug 31, 10:21 AM CDT	River Flood Warning	JAN	Copiah, Simpson	48 hr
Aug 31, 3:11 PM CDT	Special Weather Statement	JAN	Claiborne, Jefferson	39 min
Aug 31, 3:30 PM CDT	Special Weather Statement	JAN	Jasper, Simpson, Smith	40 min
Aug 31, 3:43 PM CDT	Special Weather Statement	JAN	Claiborne	32 min
Aug 31, 4:02 PM CDT	Special Weather Statement	JAN	Warren	43 min
Aug 31, 4:19 PM CDT	Special Weather Statement	JAN	Lamar, Marion	41 min
Aug 31, 4:37 PM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Warren	38 min
Aug 31, 4:57 PM CDT	Severe Thunderstorm Warning	JAN	Sharkey	33 min
Aug 31, 5:01 PM CDT	Special Weather Statement	JAN	Madison	29 min
Aug 31, 5:28 PM CDT	Special Weather Statement	JAN	Lowndes	32 min
Aug 31, 5:29 PM CDT	Special Weather Statement	JAN	Lowndes	31 min
Aug 31, 2:19 AM CDT	Special Weather Statement	JAN	Catahoula	31 min
Aug 31, 2:39 AM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Concordia, Franklin, Tensas	66 min
Aug 31, 4:12 AM CDT	Special Weather Statement	JAN	Franklin	58 min
Aug 31, 4:19 AM CDT	Severe Thunderstorm Warning	JAN	Catahoula, Franklin	56 min
Aug 31, 4:33 AM CDT	Tornado Warning	JAN	Franklin, Madison, Richland	22 min
Aug 31, 6:26 AM CDT	Special Weather Statement	JAN	Morehouse, West Carroll	44 min
Aug 31, 6:36 AM CDT	Flash Flood Warning	JAN	Catahoula, Concordia, Franklin	4 hr
Aug 31, 2:32 PM CDT	Special Weather Statement	JAN	Tensas	28 min
Aug 31, 5:45 PM CDT	Special Weather Statement	JAN	Ashley	30 min

Nearby

Special Weather Statements in Louisiana, 2012 Every special weather statement 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.