Alert archive / Louisiana / Special Weather Statements in 2012

Special Weather Statement, NWS Jackson, MS

July 20, 2012Concordia Parish, Louisiana

NWS Jackson, MS issued this special weather statement at Jul 20, 2012, 6:45 PM CDT for Concordia Parish, Louisiana. It was in force for 30 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
Jul 20, 2012, 6:45 PM CDT (23:45 UTC)
Expired
Jul 20, 2012, 7:15 PM CDT
In force
30 min
Issued by
NWS Jackson, MS

County Concordia Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.8 hours before the alert went out and 192 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 12:00Z on 2012-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2709 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2012-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2709 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
675 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
60 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 Jul 20, 3:49 PM CDT, 2 hours 56 minutes earlier.

Area forecast discussion, Jul 20, 3:49 PM CDT, 2 hours 56 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON MS
349 PM CDT FRI JUL 20 2012

.SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT
WENT CLOSE TO MAV NUMBERS FOR TEMPS THROUGH MONDAY WHILE BLENDING THE
NAM MOS INTO HIGHS FOR SATURDAY. SHORTWAVE MOVING THROUGH ARKANSAS ON
THE EASTERN SIDE OF THE RIDGE TO THE NORTHWEST WILL BE THE FOCUS TO
MOVE A FRONTAL BOUNDARY INTO THE REGION SATURDAY AND INTO SUNDAY.
TWEAKED MAV POPS SLIGHTLY FOR THE NEXT FEW DAYS WHILE TWEAKING POPS
TONIGHT AND SATURDAY NIGHT UPWARD DUE TO THE CHANCES FOR NOCTURNAL
CONVECTION. SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE AS THE FRONTAL
BOUNDARY DRIFTS SOUTH. DRIER AIR...PWATS OF 1.5 TO 2.0 INCHES..WILL
BEGIN TO FILTER IN THE NORTH TOMORROW EVENING INTO SUNDAY. CHANCES OF
RAIN WILL INCREASE SUNDAY IN ADVANCE OF AN APPROACHING UPPER LOW THAT
WILL DEVELOP OVER THE GULF COAST AND PROPAGATE TO THE NORTHWEST UNDER
THE BASE OF THE RIDGE BUILDING TO THE EAST OVER THE CENTRAL GREAT
PLAINS. FORECAST SOUNDINGS INDICATE TEMPS WILL DECREASE SLIGHTLY OVER
THE NEXT FEW DAYS AS DRIER AIR AND COOLER TEMPS ALOFT WILL FILTER IN
THE REGION. DID NOT MAKE ANY CHANCES PAST SUNDAY NIGHT SO PREVIOUS
DISCUSSION FOLLOWS. /DC/

.LONG TERM...MONDAY INTO LATE WEEK...
THE MID/UPPER HIGH WILL SHIFT POSITION AND BECOME MORE ORIENTED OVER
OUR REGION. THIS WILL RESULT IN GENERALLY LESS PRECIP POTENTIAL EACH
DAY AND TEMPS STEADILY WARMING DURING THE WEEK. GFS GUID TEMPS
INDICATED THIS AND STEADILY WARMED INTO THE MID 90S FOR HIGHS. MOST
OF THIS WAS ACCEPTED WITH JUST A COUPLE SMALL TWEAKS UPWARD AT SELECT
SITES. THE LOW LEVEL FLOW WILL MAINLY HAVE A SW COMPONENT AND THIS
SHOULD HELP READINGS FROM GETTING TOO HOT...MID 90S SEEMS TO FIT. AS
FOR PRECIP POTENTIAL...THE GFS STILL IS THE MOST AGGRESSIVE AND
INDICATES 30-40% CHANCES EACH AFTERNOON. THIS SEEMS A BIT OVER DONE
AND POPS WERE LOWERED TO THE 20% RANGE (SLGHT CHC). ONE CONCERN FOR
NEXT WEEK (ESP TUE-FRI) WILL BE THE HEAT INDEX. GOING FORECAST SHOWS
A DECENT LIKELIHOOD OF VALUES NEAR 105 DEGREES DURING THIS TIME.
ADVISORIES MAY BE NEEDED IF MID 90S OCCUR AND HUMIDITY HOLDS. /CME/

&&

.AVIATION...
VFR CONDS MOSTLY PREVAIL MINUS BRIEF MVFR AT KHBG. TSRA
HAS DVLPD BTW KHBG AND KMCB WITH TOPS AOA FL500. ADDITIONAL TSRA
COULD DVLP ACRS MS RIVER DELTA THIS AFTN NEAR KGLH AND SHIFT S
THROUGH 21/02Z TOWARDS KTVR/KJAN/KMLU WITH PERIODIC MVFR CONDS PSBL.
SFC WINDS OUTSIDE OF TSRA WILL BE WEST AT 5-10 KT WITH GUSTS TO 14
BEFORE BECMG NEAR CALM OVERNGT. MVFR TO IFR CIGS PSBL KGTR/MEI
21/10-13Z WITH LOW STRATUS. VFR CONDS TO RETURN BY 21/15Z ACRS
REGION WITH VCTS ACRS CNTRL/SRN TAF SITES AGAIN SAT AFTN. /ALLEN/

&&

.PRELIMINARY POINT TEMPS/POPS...
JACKSON       74  91  73  89 /  35  41  46  50
MERIDIAN      73  90  72  90 /  39  46  50  53
VICKSBURG     75  92  73  89 /  38  36  43  45
HATTIESBURG   73  90  74  90 /  45  69  43  53
NATCHEZ       74  90  73  87 /  37  50  36  53
GREENVILLE    75  93  74  90 /  30  20  28  28
GREENWOOD     73  91  72  90 /  31  24  30  37

&&

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

DC/CME/ALLEN
Hazardous weather outlook, Jul 20, 3:08 PM CDT, 3 hours 37 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
308 PM CDT FRI JUL 20 2012

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>028-034>037-
040>043-047>049-053>055-059>063-211945-
ASHLEY-CHICOT-MOREHOUSE-WEST CARROLL-EAST CARROLL-RICHLAND-
MADISON LA-FRANKLIN LA-CATAHOULA-TENSAS-CONCORDIA-BOLIVAR-
SUNFLOWER-LEFLORE-GRENADA-CARROLL-MONTGOMERY-WASHINGTON-HUMPHREYS-
HOLMES-ATTALA-ISSAQUENA-SHARKEY-YAZOO-MADISON MS-WARREN-HINDS-
RANKIN-CLAIBORNE-COPIAH-SIMPSON-JEFFERSON-ADAMS-FRANKLIN MS-
LINCOLN-LAWRENCE-
241 PM CDT FRI JUL 20 2012

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

.DAY ONE...TONIGHT AND SATURDAY

STRONG AND SEVERE STORMS CAPABLE OF GUSTY WINDS TO 60 MPH AND QUARTER
SIZED HAIL WILL BE POSSIBLE THIS AFTERNOON AND MOVE SOUTH THROUGH
EARLY EVENING. THERE IS A CHANCE THUNDERSTORMS COULD ORGANIZE INTO
MULTI CELL CLUSTERS OR A LINE ALONG THE MISSISSIPPI RIVER THROUGH
LATE AFTERNOON INTO THE EARLY EVENING...INCREASING THE SEVERE
WEATHER RISK OF DAMAGING WINDS. STORMS SHOULD WEAKEN THROUGH MID TO
LATE EVENING AS THEY MOVE SOUTH.

A FEW STRONG TO SEVERE STORMS WILL BE POSSIBLE AGAIN SATURDAY
AFTERNOON INTO EARLY SATURDAY EVENING AS THE REGION WILL CONTINUE TO
BE SITUATED IN A HOT AND UNSTABLE AIRMASS. WIND GUSTS OF 50 TO 60 MPH
AND QUARTER SIZED HAIL COULD OCCUR.

.DAYS TWO THROUGH SEVEN...SATURDAY NIGHT 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 IS NOT EXPECTED THROUGH NEXT THURSDAY.

MSZ029>033-038-039-044>046-050>052-056>058-064>066-072>074-211945-
WEBSTER-CLAY-LOWNDES-CHOCTAW-OKTIBBEHA-WINSTON-NOXUBEE-LEAKE-
NESHOBA-KEMPER-SCOTT-NEWTON-LAUDERDALE-SMITH-JASPER-CLARKE-
JEFFERSON DAVIS-COVINGTON-JONES-MARION-LAMAR-FORREST-
241 PM CDT FRI JUL 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN MISSISSIPPI.

.DAY ONE...TONIGHT AND SATURDAY

A FEW STRONG TO SEVERE STORMS WILL BE POSSIBLE THIS AFTERNOON AND
AGAIN ON SATURDAY AS THE REGION WILL CONTINUE TO BE SITUATED IN A
WARM AND UNSTABLE AIRMASS. WIND GUSTS OF 50 TO 60 MPH AND QUARTER
SIZED HAIL COULD OCCUR. IN ADDITION...HEAVY RAINFALL WILL OCCUR WITH
THIS ACTIVITY AND COULD POSE A FLASH FLOODING RISK.

.DAYS TWO THROUGH SEVEN...SATURDAY NIGHT 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 IS NOT EXPECTED THROUGH NEXT THURSDAY.

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

ALLEN

In the hours before

Special weather statement, Jul 20, 4:21 PM CDT, 2 hours 24 minutes before
LAZ024-202150-
CATAHOULA LA-
421 PM CDT FRI JUL 20 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
421 PM CDT FRI JUL 20 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING PEA TO DIME SIZE HAIL AND
40 TO 50 MPH WINDS WAS LOCATED OVER WALTERS AT 422 PM CDT...MOVING
SOUTH AT 10 MPH.

DANGEROUS CLOUD TO GROUND LIGHTNING IS ALSO POSSIBLE WITH THIS STORM.

HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS
INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS
DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES.

PEOPLE IN SOUTHWESTERN CATAHOULA PARISH SHOULD MONITOR THIS STORM
CLOSELY.

LAT...LON 3139 9201 3161 9201 3160 9187 3134 9188
      3135 9202 3138 9202
TIME...MOT...LOC 2122Z 007DEG 7KT 3152 9199

BK
Special weather statement, Jul 20, 5:41 PM CDT, 1 hour 4 minutes before
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Special weather statement, Jul 20, 5:46 PM CDT, 59 minutes before
MSZ062-202315-
LINCOLN MS-
546 PM CDT FRI JUL 20 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
546 PM CDT FRI JUL 20 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING PEA TO DIME SIZE HAIL AND
40 TO 50 MPH WINDS WAS LOCATED OVER CENTER POINT AT 547 PM CDT...
MOVING SOUTH AT 10 MPH.

DANGEROUS CLOUD TO GROUND LIGHTNING IS ALSO POSSIBLE WITH THIS STORM.

HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS
INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS
DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES.

PEOPLE IN SOUTH CENTRAL LINCOLN COUNTY SHOULD MONITOR THIS STORM
CLOSELY.

LAT...LON 3149 9063 3147 9048 3134 9049 3134 9063
TIME...MOT...LOC 2247Z 008DEG 12KT 3140 9060

BK
Special weather statement, Jul 20, 6:29 PM CDT, 16 minutes before
MSZ061-210000-
FRANKLIN MS-
629 PM CDT FRI JUL 20 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
629 PM CDT FRI JUL 20 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING PEA TO DIME SIZE HAIL AND
40 TO 50 MPH WINDS WAS LOCATED 4 MILES EAST OF KIRBY AT 629 PM CDT...
MOVING SOUTH AT 10 MPH.

VERY HEAVY RAIN ALONG WITH CLOUD TO GROUND LIGHTNING ARE ALSO
POSSIBLE WITH THIS STORM.

HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS
INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS
DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES.

PEOPLE IN CENTRAL FRANKLIN COUNTY SHOULD MONITOR THIS STORM CLOSELY.

LAT...LON 3141 9111 3161 9099 3161 9092 3157 9078
      3134 9086 3134 9088
TIME...MOT...LOC 2329Z 021DEG 5KT 3151 9092

BK
Special weather statement, Jul 20, 6:35 PM CDT, 10 minutes before
MSZ049-210005-
RANKIN MS-
635 PM CDT FRI JUL 20 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
635 PM CDT FRI JUL 20 2012

A STRONG THUNDERSTORM CAPABLE OF PRODUCING PEA TO DIME SIZE HAIL AND
40 TO 50 MPH WINDS WAS LOCATED OVER JOHNS AT 635 PM CDT...MOVING
SOUTH AT 10 MPH.

VERY HEAVY RAIN ALONG WITH CLOUD TO GROUND LIGHTNING ARE ALSO
POSSIBLE WITH THIS STORM.

HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS
INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS
DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES.

PEOPLE IN SOUTHEASTERN RANKIN COUNTY SHOULD MONITOR THIS STORM
CLOSELY.

LAT...LON 3205 8994 3215 8997 3221 8977 3214 8973
      3205 8973 3204 8973 3205 8993
TIME...MOT...LOC 2335Z 339DEG 5KT 3210 8983

BK
Special weather statement, Jul 20, 6:45 PM CDT, 0 minutes before
LAZ024-026-210015-
CONCORDIA LA-CATAHOULA LA-
645 PM CDT FRI JUL 20 2012

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
645 PM CDT FRI JUL 20 2012

A LINE OF THUNDERSTORMS CAPABLE OF PRODUCING 30 TO 40 MPH WINDS WAS
LOCATED FROM 7 MILES EAST OF DEER PARK TO 15 MILES SOUTHWEST OF
BLACK HAWK AT 645 PM CDT...MOVING WEST AT 20 MPH.

HIGH WINDS CAN BRING DOWN TREES AND LARGE LIMBS RESULTING IN SERIOUS
INJURY OR PROPERTY DAMAGE. EXERCISE EXTREME CAUTION WHEN OUTDOORS
DURING SUCH STRONG WINDS...AND BE ESPECIALLY AWARE OF OLDER TREES.

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

LAT...LON 3156 9201 3148 9152 3137 9147 3137 9152
      3143 9155 3139 9158 3129 9151 3126 9165
      3118 9158 3113 9162 3109 9158 3099 9166
      3104 9166 3104 9172 3120 9170 3129 9191
      3128 9194 3122 9192 3123 9200
TIME...MOT...LOC 2345Z 099DEG 15KT 3138 9148 3098 9178

BK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 7:26 PM CDTSpecial Weather StatementJANGrenada29 min
Jul 20, 2:28 PM CDTSpecial Weather StatementJANMarion27 min
Jul 20, 2:38 PM CDTSpecial Weather StatementJANCovington32 min
Jul 20, 3:04 PM CDTSpecial Weather StatementJANCovington31 min
Jul 20, 3:07 PM CDTFlash Flood WarningJANJefferson Davis, Marion113 min
Jul 20, 3:34 PM CDTSpecial Weather StatementJANAdams31 min
Jul 20, 5:34 PM CDTSevere Thunderstorm WarningJANJasper, Newton40 min
Jul 20, 5:41 PM CDTSpecial Weather StatementJANSimpson29 min
Jul 20, 5:46 PM CDTSpecial Weather StatementJANLincoln29 min
Jul 20, 6:29 PM CDTSpecial Weather StatementJANFranklin31 min
Jul 20, 6:35 PM CDTSpecial Weather StatementJANRankin30 min
Jul 19, 7:20 PM CDTSpecial Weather StatementJANCatahoula, Concordia30 min
Jul 19, 7:58 PM CDTSpecial Weather StatementJANCatahoula47 min
Jul 20, 4:21 PM CDTSpecial Weather StatementJANCatahoula29 min
Jul 20, 5:02 PM CDTSevere Thunderstorm WarningJANCatahoula43 min
Jul 20, 5:24 PM CDTFlash Flood WarningJANCatahoula50 min
Jul 20, 6:46 PM CDTSpecial Weather StatementJANTensas29 min

Nearby

Special Weather Statements in Louisiana, 2012Every 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.