Flash Flood Warning 91, NWS Jackson, MS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON MS
440 AM CDT THU JUL 11 2013

.SHORT TERM...A SURFACE BOUNDARY EXTENDS ACROSS ARKANSAS TO NEAR THE
MS/TN BORDER THIS MORNING. OTHER AREAS OF SURFACE CONVERGENCE ALSO
EXIST AS A RESULT OF EARLIER CONVECTION GENERALLY TO THE NORTH
AROUND THE REGION. MODELS SUGGEST THAT OUTFLOW BOUNDARIES WILL DROP
ACROSS MUCH OF THE REGION BY EARLY AFTERNOON WITH THE SURFACE TROUGH
DROPPING SWD TONIGHT. WARM LOW LEVEL DEWPOINTS AND PRECIPITABLE
WATER VALUES FROM 1.8 TO JUST OVER 2 INCHES WILL PROVIDE SUFFICIENT
MOISTURE TO MAINTAIN SCT TO NUMEROUS SHOWERS AND TSTMS FOR THE AREA
TODAY. THE DIFFICULTY LIES IN TIMING AND PLACEMENT OF THE REGIONS OF
BETTER COVERAGE SINCE THIS WILL DEPEND ON THE PLACEMENT OF OUTFLOW
BOUNDARIES ACROSS THE AREA.  LOW LEVEL FORCING...FROM SURFACE
FEATURES AND A DESCENDING 850 MB TROUGH...WILL BE AVAILABLE TODAY
AND THE AIR MASS WILL REMAIN UNSTABLE. UPPER SUPPORT WILL BE LIMITED
BUT VERTICAL TOTALS/LAPSE RATES WILL BE MARGINALLY SUFFICIENT TO
MAINTAIN THE POTENTIAL FOR STRONG STORMS WITH GUSTY WIND AND BRIEF
DOWNPOURS BEING THE PRIMARY RISKS. ALTHOUGH MOST STORMS WILL REMAIN
BELOW SEVERE CRITERIA...THE POSSIBILITY OF A FEW STRAY STORMS
REACHING SEVERE LEVELS CAN NOT BE RULED OUT.

RAIN CHANCES WILL DIMINISH FROM THE NORTH OVERNIGHT WHEN NEGATIVE
850 MB THETAE ADVECTION BEGINS ACROSS NRN MS AROUND SUNSET AND
CONTINUES TO THE SOUTH TONIGHT. INCREASING CIN VALUES AND
SIGNIFICANTLY COOLER 850 MB DEWPOINTS ARE INDICATED ACROSS NRN INTO
CENTRAL ZONES BY 18Z FRI...SPREADING SWD DURING THE AFTERNOON.

TEMPERATURES AND HUMIDITY WILL BE MORE REFRESHING FOR FRIDAY NIGHT
IN THE DRIER AIR MASS THAT MOVES IN...MANY AREAS COOLING INTO THE
MID 60S BY SUNRISE SATURDAY.

MAV MOS HIGHS HAVE BEEN CUT A FEW DEGREES FOR TODAY AND MAY COME IN
EVEN LOWER WHERE LATE MORNING/EARLY AFTERNOON CONVECTION DEVELOPS.
HAVE ALSO FOLLOWED LOWER GFS AVG ENSEMBLE POPS...ESPECIALLY OVER NRN
ZONES...FOR TONIGHT. /03/

.LONG TERM...SATURDAY THROUGH THE MIDDLE OF NEXT WEEK...OPERATIONAL
MODELS HAVING A LITTLE TROUBLE THROUGH THE FIRST HALF OF THE
EXTENDED PERIOD. BEST CONSISTENCY AND BELIEVABILITY GARNERED FROM
GFS ENSEMBLE MEAN SOLUTIONS. THAT BEING SAID...THERE IS A BIT OF
UNCERTAINTY TO THIS PORTION OF THE FORECAST.

KEY ELEMENT OF MODEL DISAGREEMENT IS THE CLOSED OFF UPPER LOW LIKELY
TO BE SOMEWHERE IN THE EASTERN OHIO VALLEY OR NORTHERN APPALACHIANS
SATURDAY MORNING. SOLUTIONS FROM SEVERAL DAYS AGO WANTED TO SLOWLY
MIGRATE THIS LOW SOUTHWEST THROUGH OUR REGION DURING A LARGE PORTION
OF NEXT WEEK. NOW THE OP GFS/ECMWF HAVE COME TO SOLUTIONS THAT
MIGRATE THE CENTER MORE QUICKLY WEST AND TO THE NORTH OF OUR
REGION. THESE OPERATIONAL SOLUTIONS LOOK STRANGE...NOT BEFITTING AT
ALL OF CLIMATOLOGY...AND SOMEWHAT AT ODDS WITH GFS/EURO ENSEMBLES
THAT ARE MAYBE QUICKER BUT SIMILAR TO DIRECTION OF THOSE PREVIOUS
SOLUTIONS REFERRED TO ABOVE.

THE RESULT OF THE GFS ENSEMBLE BEING MORE ACCURATE THAN THE OP
MEMBERS WOULD PROBABLY BE BETTER (AND PERHAPS MORE QUICKLY EVOLVING)
RAIN CHANCES DURING THE FIRST HALF OF NEXT WEEK...WITH AT LEAST
MINOR SHOWER CHANCES MAYBE RETURNING TO FAR SE MS AS EARLY AS LATE
SATURDAY. ALL SCENARIOS SUGGEST THROUGH THE FIRST HALF OF NEXT WEEK
A SITUATION WHERE MOIST SOUTH TO SOUTHEAST FLOW VECTORS IN THE
LOWER TO MID LAYERS OF THE ATMOSPHERE STREAM INTO AT LEAST SOUTHERN
ZONES AND PROMOTE ABOVE AVERAGE CHANCES OF PRIMARILY AFTERNOON AND
EARLY EVENING SHOWERS AND STORMS. SOME OF THE LATEST OP MODELS ARE
SO INTENSE WITH SUBTROPICAL RIDGING TO OUR NORTH THAT IT IS POSSIBLE
THE SUBSIDENT INFLUENCE COULD LIMIT RAIN CHANCES SOME OVER THIS
PERIOD IN MY NORTHERN ZONES...AS WELL AS INCREASE HEAT A LITTLE.

BUT...FOR NOW...MASSAGED MEX POP/TEMP NUMBERS TO SUGGEST
TEMPERATURES NEAR OR SLIGHT BELOW AVERAGE THROUGH THE LONG TERM WITH
RAIN CHANCES AFTER SATURDAY ABOVE AVERAGE FOR ALL AREAS. ATMOSPHERIC
PARAMETERS SUGGEST THE UPPER LEVELS MAY STAY COOL ENOUGH TO ALLOW
FOR DECENT THUNDER COVERAGE...ALTHOUGH THERE REALLY ARE NO SIGNS IN
THE MODEL FIELDS OF ANY MAJOR POTENCY. IT IS NOT INCONCEIVABLE IN AT
LEAST SOUTHERN ZONES WE COULD HAVE SOME BRIEF HEAVY RAIN ISSUES THAT
MAY WARRANT MENTION IN HAZARDOUS WEATHER OUTLOOKS TO COME. BUT...AS
OF RIGHT NOW...THE POTENTIAL SCALE OF THAT PROBLEM WEIGHTED WITH
UNCERTAINTY ARGUES TO KEEP THE LONG TERM SECTION OF THE HWO CLEAR.
/BB/

&&

.AVIATION...PATCHES OF MVFR CIGS/VSBY IN MORNING STRATUS AND FOG CAN
BE EXPECTED THROUGH 14Z. VFR CONDITIONS WILL BE IN PLACE AT MOST
LOCATIONS TODAY WITH SCT-BKN DECKS BELOW 6K FEET THIS MORNING
BECOMING BKN-OVC LATER TODAY. THE EXCEPTION WILL BE MVFR CIGS AND
IFR/MVFR VSBYS THAT WILL OCCUR IN SHWRS/TSTMS WHICH WILL BE ISOLATED
OVER NRN AND ERN ZONES THROUGH 12Z AND INCREASING ACROSS THE
FORECAST AREA FROM THE NORTH AND EAST DURING THE MORNING AND
AFTERNOON. SOME TSTMS WILL BE STRONG WITH GUSTY DOWNBURST WINDS AND
BRIEF DOWNPOURS. A FEW SEVERE STORMS CAN NOT BE RULED OUT. /03/

&&

.PRELIMINARY POINT TEMPS/POPS...
JACKSON       90  71  92  68 /  65  14  11   4
MERIDIAN      90  71  93  67 /  72  16  13   5
VICKSBURG     90  69  93  68 /  57  15   7   6
HATTIESBURG   89  72  94  70 /  72  30  28   6
NATCHEZ       89  72  90  68 /  59  28  12   3
GREENVILLE    91  72  91  67 /  44   9   2   7
GREENWOOD     91  70  89  66 /  47  10   3   6

&&

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

BB/03

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
519 AM CDT THU JUL 11 2013

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
121030-
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-
519 AM CDT THU JUL 11 2013

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

.DAY ONE...TODAY AND TONIGHT

STRONG THUNDERSTORMS...WITH WIND GUSTS FROM 40 TO 50 MPH...WILL BE
POSSIBLE TODAY. ONE OR TWO SEVERE STORMS WITH WIND GUSTS TO 60 MPH
CAN NOT BE RULED OUT. HEAVY DOWNPOURS CAN BE ANTICIPATED WITH
THUNDERSTORMS TODAY AND LOCAL FLOODING OF STREETS AND LOW LYING
AREAS MAY OCCUR.

THUNDERSTORMS WILL INCREASE IN COVERAGE ACROSS THE AREA THIS MORNING
AND AFTERNOON AS A FRONT APPROACHES THE REGION FROM THE NORTH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

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 LIKELY THROUGH WEDNESDAY.

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

03

MSZ030-031-033-039-046-111115-
OKTIBBEHA MS-NOXUBEE MS-LOWNDES MS-KEMPER MS-CLAY MS-
514 AM CDT THU JUL 11 2013

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
514 AM CDT THU JUL 11 2013

...LINE OF STORMS PUSHING SOUTHWEST THROUGH THE GOLDEN TRIANGLE...

A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING 45 MPH WIND GUSTS
WAS LOCATED FROM 3 MILES NORTHWEST OF KOLOLA SPRINGS TO 9 MILES
SOUTHEAST OF COOKSVILLE AT 513 AM CDT...MOVING SOUTHWEST AT 25 MPH.

VERY HEAVY RAIN ALONG WITH FREQUENT CLOUD TO GROUND LIGHTNING
STRIKES ARE ALSO POSSIBLE WITH THESE STORMS.

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 CLAY...EASTERN KEMPER...LOWNDES...EASTERN
NOXUBEE AND SOUTHEASTERN OKTIBBEHA COUNTIES SHOULD MONITOR THESE
STORMS CLOSELY.

LAT...LON 3258 8839 3258 8848 3260 8849 3333 8871
      3369 8852 3367 8846 3370 8839 3335 8828
TIME...MOT...LOC 1013Z 024DEG 20KT 3368 8845 3292 8822

BYB

MSZ029-030-032-033-038-039-045-046-051-052-057-058-111300-
WINSTON MS-WEBSTER MS-OKTIBBEHA MS-NOXUBEE MS-NEWTON MS-NESHOBA MS-
LAUDERDALE MS-KEMPER MS-JASPER MS-CLAY MS-CLARKE MS-CHOCTAW MS-
702 AM CDT THU JUL 11 2013

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
702 AM CDT THU JUL 11 2013

...LINE OF GUSTY STORMS PUSHING SOUTHWEST INTO EASTERN MISSISSIPPI...

A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING 45 MPH WIND
GUSTS WAS LOCATED FROM 4 MILES SOUTH OF GRIFFITH TO 3 MILES SOUTH OF
ALAMUCHA AT 701 AM CDT...MOVING SOUTHWEST AT 15 MPH.

VERY HEAVY RAIN ALONG WITH OCCASIONAL TO FREQUENT CLOUD TO GROUND
LIGHTNING STRIKES ARE ALSO POSSIBLE WITH THESE STORMS.

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 NORTHEASTERN CHOCTAW...CLARKE...CENTRAL CLAY...NORTHEASTERN
JASPER...KEMPER...LAUDERDALE...EASTERN NESHOBA...EASTERN NEWTON...
WESTERN NOXUBEE...OKTIBBEHA...EAST CENTRAL WEBSTER AND WINSTON
COUNTIES SHOULD MONITOR THESE STORMS CLOSELY.

LAT...LON 3223 8842 3193 8870 3222 8898 3258 8899
      3355 8921 3372 8880 3237 8841
TIME...MOT...LOC 1201Z 038DEG 13KT 3356 8884 3230 8847

BYB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
722 AM CDT THU JUL 11 2013

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

0722 AM     FLASH FLOOD      COLUMBUS                33.51N 88.40W
07/11/2013                   LOWNDES            MS   LAW ENFORCEMENT

            REPORTS OF MULTIPLE STREETS FLOODED IN COLUMBUS.

&&

DCOX

MSZ029-032-033-037-038-044-045-050>052-056>058-066-111405-
ATTALA MS-WINSTON MS-WEBSTER MS-SMITH MS-SCOTT MS-OKTIBBEHA MS-
NEWTON MS-NESHOBA MS-LEAKE MS-LAUDERDALE MS-JONES MS-JASPER MS-
CLARKE MS-CHOCTAW MS-
806 AM CDT THU JUL 11 2013

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
806 AM CDT THU JUL 11 2013

...GUSTY LINE OF SHOWERS AND THUNDERSTORMS CONTINUES TO PUSH
SOUTHWEST TOWARD CENTRAL MISSISSIPPI THIS MORNING...

A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING 45 MPH WIND GUSTS
WAS LOCATED FROM 6 MILES SOUTHEAST OF ACKERMAN TO 7 MILES SOUTH OF
CRANDALL AT 806 AM CDT...MOVING SOUTHWEST AT 20 MPH.

VERY HEAVY RAIN ALONG WITH FREQUENT CLOUD TO GROUND LIGHTNING
STRIKES ARE ALSO POSSIBLE WITH THESE STORMS.

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 CHOCTAW...CLARKE...JASPER...NORTHEASTERN JONES...
SOUTHWESTERN LAUDERDALE...EASTERN LEAKE...NESHOBA...NEWTON...
SOUTHWESTERN OKTIBBEHA...EASTERN SCOTT...NORTHEASTERN SMITH...CENTRAL
WEBSTER...WESTERN WINSTON AND EASTERN ATTALA COUNTIES SHOULD MONITOR
THESE STORMS CLOSELY.

LAT...LON 3189 8848 3183 8874 3182 8894 3171 8894
      3224 8940 3304 8944 3365 8933 3340 8904
      3260 8900 3195 8845
TIME...MOT...LOC 1306Z 044DEG 16KT 3324 8911 3253 8907
          3186 8851

BYB