A squall line moving across the region downed a tree in Morehouse Parish.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS JAN wrote it up.
A squall line moving across the region downed a tree in Morehouse Parish.
The local office's own words before the first event, 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 the first event at Dec 9, 3:16 PM CST, 6 hours 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSON MS 316 PM CST SUN DEC 9 2012 .SHORT TERM...TODAY THROUGH TUESDAY NIGHT...A DEEP UPPER TROUGH AND ASSOCIATED COLD FRONT WILL MOVE INTO THE DELTA LATE THIS EVENING AND CONTINUE TO MOVE ACROSS THE AREA THROUGH THE NIGHT. THE MODELS HAVE SPED UP THE FRONT A TOUCH FROM PREVIOUS RUNS AND ALSO CONTINUE TO INDICATE MARGINAL INSTABILITY WITH AROUND 400-600 J/KG OF MU CAPE WITH THE INSTABILITY WAINING AS THE FRONT PROGRESSES ACROSS THE AREA. THE NAM CONTINUES TO BE THE MOST UNSTABLE...BUT IT IS THE OUTLIER WITH THE GFS/ECMWF BOTH IN AGREEMENT OF LESS CAPE. THE MODELS CONTINUE TO INDICATE AROUND 25KT OF 0-1KM SHEAR WITH THE STRONGEST SHEAR THIS EVENING AND BECOMING UNIDIRECTIONAL OUT OF THE SOUTHWEST TONIGHT...SO CONTINUE EXPECT A SQUALL LINE TO MOVE THROUGH THE AREA WITH STRONG TO SEVERE POSSIBLE. EXPECT STRONG WINDS TO BE THE MAIN RISK WITH GUSTS OF 40-60 MPH. THE HIGHEST RISK OF SEVERE WILL BE MAINLY FOR AREAS NORTHWEST OF THE NATCHEZ TRACE ASSOCIATED WITH THE BEST INSTABILITY. THE FRONT WILL MOVE EAST OF THE AREA BY EARLY TO MID AFTERNOON ON MONDAY WITH SHOWERS ENDING FROM NORTHWEST TO SOUTHEAST. THE SURFACE GRADIENT IN THE WAKE OF THE FRONT WILL BE TIGHT ENOUGH TO SUPPORT GUSTY WINDS...WITH GUSTS FROM 25-30 MPH POSSIBLE IN THE DELTA DURING THE LATE MORNING INTO THE AFTERNOON HOURS. COLD HIGH PRESSURE WILL BUILD IN OVER THE AREA MONDAY NIGHT INTO TUESDAY WITH LOWS FALLING INTO THE UPPER 20S TO LOW 30S. A COOL DAY IS ON TAP FOR TUESDAY WITH HIGHS ONLY CLIMBING INTO THE MID 40S TO AROUND 50. CLOUDS WILL BE ON THE INCREASE LATE ON TUESDAY AS A BAROCLINIC ZONE SETS UP TO THE SOUTH OF THE AREA OUT AHEAD OF ANOTHER STRONG UPPER TROUGH THAT WILL MOVE THROUGH ON WEDNESDAY. WITH THE INCREASE IN CLOUDS THE TEMPERATURES MAY MODERATE A BIT TUESDAY NIGHT...SO WILL GO WITH GUIDANCE TEMPS FOR LOWS. A FEW LIGHT SPRINKLES...OR POSSIBLY A FEW FLURRIES MAY ALSO BE POSSIBLE IN THE SOUTHEAST EARLY ON WEDNESDAY ALSO. STUCK PRETTY CLOSE TO GUIDANCE TEMPERATURES THROUGH THE PERIOD...BUT DID RAISE ABOVE POP GUIDANCE TONIGHT IN SOME AREAS. DID NOT MAKE ANY CHANGES TO THE FORECAST BEYOND TUESDAY NIGHT...SO WILL ATTACH THE APPLICABLE PORTIONS OF THE PREVIOUS LONG TERM BELOW./15/ .PREVIOUS LONG TERM...LOW LEVEL CHILLY HIGH PRESSURE ANCHORED IN VICINITY WILL SPELL MOSTLY CLEAR SKIES FOR THE REGION LATE TUESDAY NIGHT THROUGH THURSDAY...ALTHOUGH LIGHT WINDS WILL TURN AROUND TO THE SOUTH BY THURSDAY. TEMPERATURES WILL AVERAGE AROUND 5 TO 10 DEGREES BELOW NORMAL (WHICH IS QUITE A DEPARTURE FROM RECENT TRENDS) TUESDAY NIGHT THROUGH WEDNESDAY NIGHT. EXPECT MODERATION TO NEAR NORMAL THURSDAY INTO THURSDAY NIGHT WITH SUBTLE INCREASE IN HIGHER CLOUDS AS ENERGY GATHERS OUT TO OUR WEST. VIGOROUS INFLUX OF THE PACIFIC UPPER JET INTO THE FOUR CORNERS AND SOUTHERN PLAINS LATE NEXT WEEK AND INTO THE WEEKEND WILL PUT THE LOWER MISSISSIPPI IN THE CROSSHAIRS FOR STORMINESS BY NEXT WEEKEND. MENTIONED ENERGY WILL COME UP AGAINST NORTHERN FRINGE OF SUBTROPICAL RIDGING IN THE DEEP SOUTH...POTENTIALLY SETTING THE STAGE FOR A ROUND OR TWO OF NEARBY CYCLOGENESIS OCCURRING ALONG STALLING FRONTS. INITIAL MODEL PROJECTIONS SHOWS PLENTY OF MOISTURE WILL CONGREGATE IN THE WESTERN GULF AND PROVIDE FUEL FOR AT LEAST HEAVY RAIN PRODUCTION AS WE GO INTO THE FIRST PART OF NEXT WEEK. THIS PERIOD FROM LATE THIS WEEK INTO EARLY NEXT WEEK WILL HAVE TO BE WATCHED CLOSELY FOR IMPACT WEATHER IN THE DAYS TO COME...BUT UNCERTAINTY WAY TOO HIGH TO START MENTIONING IN THE HWO AT THIS JUNCTURE. FOR NOW I GENERALLY ACCEPTED MEX MOS POPS (ALTHOUGH DELAYING ONSET OF SIGNIFICANT POPS A LITTLE) AND WHOLLY ACCEPTED MEX TEMPS TRENDING ABOVE NORMAL. /BB/ && .AVIATION...BROKEN TO SCATTERED MVFR/VFR CLOUDS 2-5K FEET WILL CONTINUE THIS EVENING WITH GUSTY S WINDS 13-20KTS. ISOLATED SHRA/TSRA ARE UNDERWAY FOR OUR WRN/SRN PORTIONS AND THESE PICK UP TO SCATTERED/NUMEROUS COVERAGE W OF I-55 FROM 00Z-06Z. A STRONG COLD FRONT MOVING THROUGH CENTRAL AR/ERN TX PUSHES INTO OUR DELTA BY 05-08Z...REACHING A GRENADA-KTVR-KHEZ LINE 09-12Z... KGTR-KJAN-KMCB LINE 12-15Z...KMEI-KHBG LINE 16-19Z. A LINE OF SHRA/TSRA IS LIKELY WITH THE FROPA WHEN A FEW WIND GUSTS OF 40-55KTS COULD OCCUR. OTHERWISE...WIND SHIFTS TO THE NNW AT 15-30KTS AND MVFR CONDITIONS SHOULD LOWER TO AREAS OF IFR IN RAIN FOR MUCH OF MONDAY AFTERNOON DURING THE STRONGEST CAA. /40/ && .PRELIMINARY POINT TEMPS/POPS... JACKSON 57 57 30 49 / 100 100 2 12 MERIDIAN 62 64 31 50 / 86 100 12 14 VICKSBURG 53 53 29 49 / 100 70 0 10 HATTIESBURG 62 64 34 52 / 63 100 12 19 NATCHEZ 52 52 31 49 / 100 95 1 11 GREENVILLE 46 49 28 47 / 100 54 0 7 GREENWOOD 50 51 28 47 / 100 70 0 8 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...NONE. LA...NONE. AR...NONE. && 15/40
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE JACKSON MS 925 PM CST SUN DEC 9 2012 MSZ029>033-037>039-043>046-048>066-072>074-102045- WEBSTER-CLAY-LOWNDES-CHOCTAW-OKTIBBEHA-ATTALA-WINSTON-NOXUBEE- MADISON MS-LEAKE-NESHOBA-KEMPER-HINDS-RANKIN-SCOTT-NEWTON- LAUDERDALE-CLAIBORNE-COPIAH-SIMPSON-SMITH-JASPER-CLARKE-JEFFERSON- ADAMS-FRANKLIN MS-LINCOLN-LAWRENCE-JEFFERSON DAVIS-COVINGTON- JONES-MARION-LAMAR-FORREST- 925 PM CST SUN DEC 9 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOST OF CENTRAL...SOUTH AND EAST MISSISSIPPI. .DAY ONE...TONIGHT AND MONDAY STRONG TO POSSIBLY SEVERE THUNDERSTORMS ARE EXPECTED FROM ABOUT MIDNIGHT TONIGHT THROUGH 8AM MONDAY MORNING AS A SQUALL LINE OF STORMS MOVES EAST. WIND GUSTS OF 40 TO 60 MPH AND SMALL HAIL APPEAR TO BE THE MAIN RISKS...BUT A TORNADO CANNOT BE RULED OUT. WINDS ALONG THE FRONT ITSELF WILL GUST 30 TO 40 MPH IN PLACES AS MUCH COLDER AIR RETURNS BY MONDAY NIGHT WITH SUB-FREEZING OVERNIGHT TEMPERATURES ONCE AGAIN. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SATURDAY THE PROBABILITY OF 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 INTO MONDAY MORNING. ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>028-034>036- 040>042-047-102045- ASHLEY-CHICOT-MOREHOUSE-WEST CARROLL-EAST CARROLL-RICHLAND- MADISON LA-FRANKLIN LA-CATAHOULA-TENSAS-CONCORDIA-BOLIVAR- SUNFLOWER-LEFLORE-GRENADA-CARROLL-MONTGOMERY-WASHINGTON-HUMPHREYS- HOLMES-ISSAQUENA-SHARKEY-YAZOO-WARREN- 925 PM CST SUN DEC 9 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST LOUISIANA... EXTREME SOUTHEAST ARKANSAS AND THE DELTA AREA OF MISSISSIPPI. .DAY ONE...TONIGHT AND MONDAY A DEVELOPING SQUALL LINE WITH STRONG TO SEVERE THUNDERSTORMS WILL MOVE ACROSS THE DELTA REGION AS WE GO INTO THE EARLY MORNING HOURS. DAMAGING WIND GUSTS OF 50 TO 60 MPH AND HAIL APPEAR TO BE THE MAIN RISKS...WITH A LESSER RISK FOR A COUPLE OF TORNADOES AS THE STORMS DEVELOP AND FORM INTO A SQUALL LINE. WINDS ALONG THE FRONT ITSELF WILL GUST UP TO 40 MPH IN PLACES LATE TONIGHT AS MUCH COLDER AIR RETURNS BY MONDAY NIGHT WITH SUB-FREEZING OVERNIGHT TEMPERATURES ONCE AGAIN. .DAYS TWO THROUGH SEVEN...MONDAY NIGHT THROUGH SATURDAY THE PROBABILITY OF 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 INTO EARLY MONDAY MORNING. FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.SRH.NOAA.GOV/JAN EC
MSZ066-073-074-092330-
LAMAR MS-JONES MS-FORREST MS-
431 PM CST SUN DEC 9 2012
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
431 PM CST SUN DEC 9 2012
A CLUSTER OF THUNDERSTORMS CAPABLE OF PRODUCING 35 TO 45 MPH WINDS
WAS MOVING THROUGH THE HATTIESBURG TO LAUREL AREA AT 428 PM
CST...MOVING NORTHEAST AT 20 MPH.
PEOPLE IN FORREST...SOUTHERN JONES AND EASTERN LAMAR COUNTIES SHOULD
BE AWARE OF THESE STORMS THROUGH 530PM.
LAT...LON 3091 8935 3100 8935 3100 8941 3098 8943
3097 8947 3101 8951 3101 8956 3143 8947
3143 8940 3174 8940 3160 8893 3144 8894
3143 8914 3113 8914 3090 8932
TIME...MOT...LOC 2228Z 224DEG 18KT 3088 8944
JCThe Shreveport radar (KSHV), 182 km away, was scanning. The volume nearest the first event began at 03:57 UTC.
1 thunderstorm wind. Local standard time, as filed.
A tree was blown down along Highway 139.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2012Every state in 2012This day in weather historyWarnings in Louisiana, December 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 420102.