Severe Thunderstorm Warning 339, NWS Jackson, MS

000 
WWUS54 KJAN 122027
SVSJAN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
326 PM CDT THU JUL 12 2007

MSC049-089-122036-
/O.CAN.KJAN.SV.W.0339.000000T0000Z-070712T2045Z/
HINDS MS-MADISON MS-
326 PM CDT THU JUL 12 2007

...THE SEVERE THUNDERSTORM WARNING FOR MADISON AND HINDS COUNTIES IS
CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS WEAKENED 
BELOW SEVERE LIMITS.  HOWEVER...THIS STORM MAY PRODUCE WIND GUSTS TO 
40 MPH...OCCASIONAL LIGHTNING...AND VERY HEAVY RAIN AS IT MOVES EAST 
ACROSS SOUTHERN MADISON AND EXTREME NORTHERN MADISON COUNTY.

LAT...LON 3263 9032 3247 9060 3236 9024 3260 9015

$$

AEG

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE JACKSON MS
1005 AM CDT THU JUL 12 2007

LATEST SATELLITE IMAGERY SHOWS A WEAKENING MCS...WHICH WAS ASSOCIATED WITH AN
UPPER LEVEL DISTURBANCE PUSHING SOUTHEAST INTO ARKANSAS. AREA RADARS
WERE NOTING SOME ISOLATED SHOWERS ACROSS NORTHWEST MISSISSIPPI
...WHICH WAS PUSHING INTO AN 850 THETA MIN REGION. ON THE SURFACE A
WEAK BOUNDARY WAS NOTED ACROSS PORTIONS OF CENTRAL MISSISSIPPI. AREA
MORNING SOUNDINGS WERE SHOWING SOME CONTINUED GOOD INSTABILITY FOR
THIS AFTERNOON. AS THE UPPER DISTURBANCE APPROACHES EXPECT A THETA
RIDGE(335 TO AROUND 340K) TO DEVELOP ACROSS MAINLY THE WESTERN HALF
FOR THIS AFTERNOON. PWATS WILL BE INCREASING TO A LITTLE OVER 2
INCHES OVER THE WEST HALF. 850 MB WINDS WILL BE RATHER WEAK
AT AROUND 10 TO 15 KNOTS...BUT 500 MB WINDS WILL BE 15 TO 25 KNOTS.
SO EXPECT THE UPPER LEVEL DISTURBANCE TO PUSH ALONG THE BOUNDARY AND
HELP TO DEVELOP SHOWERS AND THUNDERSTORMS ACROSS THE REGION...MAINLY
WEST OF INTERSTATE 55. SO WITH BOUNDARY AROUND AN ISOLATED STRONG TO
SEVERE THUNDERSTORMS WILL NOT BE OUT OF THE QUESTION FOR THIS
AFTERNOON AND EVENING.

TEMPERATURES LOOK TO BE ON TRACK WITH HIGHS IN THE LOWER TO MIDDLE
90S. MADE SOME SLIGHT ADJUSTMENTS TO CLOUD COVER BASES ON PRESENT
TRENDS...MAINLY ACROSS THE NORTHWEST HALF. CURRENT POPS LOOKS TO BE
ON LINE WITH CURRENT FORECAST. WILL KEEP THE BEST LOW POPS IN THE
WEST./17/

.AVIATION...VFR CONDITIONS WILL CONTINUE FOR THE REST OF THE
DAY...EXCEPT FOR MVFR LOWER CLOUD HEIGHTS AND VISIBILITIES IN
SHOWERS AND THUNDERSTORMS. THIS WILL MAINLY AFFECT GLH...GWO...JAN
AND HBG. CLOUDS WILL LIKELY REMAIN ABOVE 3KFT...BUT VISIBILITIES MAY
FALL TO 2SM OR LESS WITH HEAVY DOWNPOURS. WILL MAINTAIN RAIN IN THE
18Z-04Z PERIOD...STARTING AROUND GLH/GWO AND MOVING INTO JAN/MEI IN
THE LATE AFTERNOON. WILL ADD PATCHY FOG TO MOST SITES AFTER 06Z. THE PATCHY
FOG SHOULD QUICKLY LIFT BY 13Z. WILL PUT IN VCTS IN TAF SITES ACROSS
THE REGION FOR FRIDAY MORNING. CEILINGS SHOULD BE AT VFR FOR FRIDAY
MORNING./17/

&&

.PREVIOUS DISCUSSION...448 AM CDT THU JUL 12 2007

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT.
DID NOT MAKE ANY BIG CHANGES TO THE SHORT TERM FORECAST. TEMPERATURES
CAME IN A DEGREE OR TWO WARMER...SO STUCK WITH THE GUIDANCE. BREAKS
IN THE CLOUDS HAVE ALLOWED THE MOST OF THE AREA TO WARM INTO THE
LOWER 90S FOR THE PAST FEW DAYS...EXPECT SIMILAR CONDITIONS TO
CONTINUE...SO LOWER 90S WERE GOOD. STUCK WITH WARMER LOWS...THE EAST
MAY COOL OFF A LITTLE MORE...BUT LOWER 70S WERE GOOD ACROSS THE CWA.
POPS WERE ALSO GOOD...TWEAKED UP IN A FEW SPOTS. THE MODELS SEEM MORE
IN GOOD AGREEMENT FOR TODAY AND SATURDAY...SO USED A BLEND OF THE
NAM/GFS SOLUTIONS. WILL STICK WITH THE ISOLATED SEVERE
WORDING...ESPECIALLY FOR THE WESTERN ZONES...WILL ALSO HAVE TO WATCH
THE SOUTH WITH A BOUNDARY STALLED ACROSS THE AREA. ANYWAY...THE UPPER
DISTURBANCE MOVING INTO OKLAHOMA WAS EXPECTED TO MOVE INTO THE CWA BY
LATE AFTERNOON EARLY EVENING. ANOTHER BOUNDARY SINKS DOWN INTO THE
AREA BY EARLY AFTERNOON AND SERVES AS THE FOCUS FOR STORMS EARLY
ACROSS THE NORTH. THE RUC SHOWS A THETA E RIDGE OVER SOUTHEAST
ARKANSAS AND SOME INSTABILITY IN THE AREA WHERE A FEW SHOWERS AND
THUNDERSTORMS HAVE ALREADY DEVELOPED. THERE WAS ALSO GOOD THETA E
VALUES AND SOME INSTABILITY TO SOUTH...WHERE THE BOUNDARY FROM
EARLIER HAS STALLED. SOUNDINGS CONTINUE TO SHOW GOOD
INSTABILITY...INCREASING MOISTURE AND LAPSE RATES BY THE AFTERNOON.
WINDS AROUND 850MB DID NOT LOOK AS GOOD...BUT WINDS WERE STILL
AROUND 15KTS. ACTIVITY SEEMS TO TAPER OFF IN THE EVENING...BUT GETS
STARTED EARLY IN THE MORNING. STUCK WITH GUIDANCE VALUES FOR
TODAY...BUT RAISED VALUES TO LIKELY EVERYWHERE FRIDAY. WILL ALSO
CONTINUE THE ISOLATED SEVERE WORDING FOR FRIDAY ALSO...WITH ANOTHER
WAVE DROPPING IN BY THE AFTERNOON. ALSO PW VALUES STAY AROUND 2
INCHES OR SLIGHTLY HIGHER...INSTABILITY AND LAPSE RATES WERE ALSO
GOOD IN THE AFTERNOON AND EVENING.

.LONG TERM...
UPPER FLOW BECOMES W/SWLY BY THE WEEKEND IN ADVANCE OF A WAVE THAT
DIGS ALONG THE SRN FRINGES OF THE UPPER TROUGH TO OUR NORTHEAST. THE
AIR MASS REMAINS MOIST AND UNSTABLE WITH PRECIPITABLE WATER VALUES
ABOVE 1.5 INCHES AND SURFACE DEWPOINTS IN THE 70S. THE REMNANTS OF
THE SURFACE BOUNDARY BECOME MORE DIFFUSE BUT WEAK SURFACE CYCLONIC
FLOW IS INDICATED ALONG SRN ZONES. DEEP LAYER SHEAR IS FORECAST TO
INCREASE WITH AREAS OF 25-30 KTS AT SOME LOCATIONS BY 00Z SUNDAY.
WILL MAINTAIN MENTION OF ISOLATED SEVERE STORMS IN THE HWO FOR
SATURDAY.
THE UPPER TROUGH HANGS BACK OVER TX SUNDAY BUT LOW LEVEL FORCING IS
REDUCED ERN ZONES WHERE WEAK SURFACE RIDGING BEGINS TO EDGE WWD.

CONVECTION BECOMES MORE DIURNAL AND SCATTERED IN NATURE BY THE
BEGINNING OF THE WORK WEEK. LOW LEVEL SLY FLOW CONTINUES BUT UPPER
RIDGING BEGINS TO BUILD FROM THE EAST. THE FORECAST AREA REMAINS ON
THE WRN FRINGES OF DEVELOPING UPPER RIDGING MONDAY THROUGH
WEDNESDAY. THE MODELS SLOW PROGRESSION OF THE TX LOW COMPARED TO
PREVIOUS RUNS...DIGGING THE UPPER LOW INTO TX WHILE HIGH PRESSURE
BUILDS OVER THE SOUTHEAST. LOWER LEVEL FLOW BECOMES MORE
ANTICYCLONIC WITH TIME...RESULTING IN DECREASING POPS AND INCREASING
AFTERNOON TEMPERATURES BY MID WEEK.

&&

.AVIATION...
WILL CONTINUE SHRA/TSRA IN THE AFTERNOON AND EVENING. CLOUDS WILL
LIKELY REMAIN ABOVE 3KFT...BUT VISIBILITIES MAY FALL TO 2SM OR LESS
WITH HEAVY DOWNPOURS. WILL MAINTAIN RAIN IN THE 18-04Z
PERIOD...STARTING AROUND GLH/GWO AND MOVING INTO JAN/MEI IN THE LATE
AFTERNOON. WITH A BOUNDARY SOUTH OF HBG...WILL GO WITH TSRA/SHRA
AROUND 18Z FOR STORMS DEVELOPING EARLY. MAY ADD PATCHY FOG TO MOST
SITES AFTER 6Z.

&&

.PRELIMINARY POINT TEMPS/POPS...
JACKSON       93  73  92  70 /  25  26  55  32
MERIDIAN      93  71  90  69 /  16  22  61  43
VICKSBURG     95  73  92  72 /  28  25  56  26
HATTIESBURG   93  72  92  71 /  25  16  56  42
NATCHEZ       93  72  91  70 /  34  18  56  28
GREENVILLE    94  70  92  72 /  29  43  56  26
GREENWOOD     92  71  89  71 /  25  44  57  27

&&

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

07/03

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
247 PM CDT THU JUL 12 2007

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
132000-
ASHLEY-CHICOT-MOREHOUSE-WEST CARROLL-EAST CARROLL-RICHLAND-
MADISON-FRANKLIN-CATAHOULA-TENSAS-CONCORDIA-BOLIVAR-SUNFLOWER-
LEFLORE-GRENADA-CARROLL-MONTGOMERY-WEBSTER-CLAY-LOWNDES-CHOCTAW-
OKTIBBEHA-WASHINGTON-HUMPHREYS-HOLMES-ATTALA-WINSTON-NOXUBEE-
ISSAQUENA-SHARKEY-YAZOO-LEAKE-NESHOBA-KEMPER-WARREN-HINDS-RANKIN-
SCOTT-NEWTON-LAUDERDALE-CLAIBORNE-COPIAH-SIMPSON-SMITH-JASPER-
CLARKE-JEFFERSON-ADAMS-LINCOLN-LAWRENCE-JEFFERSON DAVIS-COVINGTON-
JONES-MARION-LAMAR-FORREST-
247 PM CDT THU JUL 12 2007

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

.DAY ONE...TONIGHT AND FRIDAY
A SERIES OF UPPER LEVEL DISTURBANCES WILL MOVE SOUTHEAST ALONG A WEAK
FRONTAL BOUNDARY DURING THE PERIOD. THIS COMBINED WITH
INSTABILITY...RICH LOW LEVEL MOISTURE...SOME WIND SHEAR
DYNAMICS...AND DAYTIME HEATING WILL PROVIDE SEVERAL ROUNDS OF STRONG
TO POSSIBLE SEVERE STORMS FOR THIS AFTERNOON INTO THIS
EVENING AS WELL AS ON FRIDAY. THE PRIMARY CONCERNS WITH THE STORMS
OR STORM CLUSTERS WILL BE LOCALLY HEAVY DOWNPOURS...FREQUENT
LIGHTNING AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY NIGHT THROUGH WEDNESDAY

AN UPPER LEVEL WAVE OF ENERGY MOVING THROUGH THE ARKLAMISS
BETWEEN FRIDAY NIGHT AND LATE SATURDAY IS EXPECTED TO BRING A FEW
ROUNDS OF THUNDERSTORMS TO THE REGION. MODERATE LEVELS OF WIND SHEAR
AND THE HIGH AVAILABILITY OF MOISTURE WILL GIVE INDIVIDUAL
STORMS...AND STORM CLUSTERS...THE ABILITY TO PRODUCE DAMAGING WINDS
AND TORRENTIAL RAINFALL. MINOR FLOODING AND PONDING OF WATER ISSUES
ARE POSSIBLE DUE TO RECENT REGIONAL PRECIPITATION. THE POTENTIAL FOR
ANY EXCESSIVE RAINFALL AMOUNTS APPEARS HIGHEST ACROSS NORTHWEST
MISSISSIPPI...NORTHEAST LOUISIANA AND EXTREME SOUTHEAST ARKANSAS. THE
TIMING OF THUNDERSTORMS FROM FRIDAY NIGHT THROUGH LATE IN THE DAY
SATURDAY IS DIFFICULT AT THIS POINT...SO PEOPLE WITH OUTDOOR PLANS
OVER THIS PERIOD SHOULD PAY CLOSE ATTENTION TO LATER FORECASTS.

.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.

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.SRH.NOAA.GOV/JAN. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

17/50

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
1258 PM CDT THU JUL 12 2007

MSZ019-034>037-121900-
SUNFLOWER MS-WASHINGTON MS-HOLMES MS-HUMPHREYS MS-ATTALA MS-
1258 PM CDT THU JUL 12 2007

A LINE OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING VERY HEAVY RAIN
WAS LOCATED FROM 5 MILES SOUTHEAST OF GREENVILLE TO 6 MILES
NORTHWEST OF DURANT...MOVING SOUTHEAST AT 10 MPH.  GUSTY WINDS OF 40
MPH...VERY HEAVY RAIN UP OF ONE TO TWO INCHES PER HOUR AND
FREQUENT CLOUD TO GROUND LIGHTNING STRIKES ARE LIKELY 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 SUNFLOWER...WASHINGTON...HOLMES...HUMPHREYS AND ATTALA
COUNTIES...INCLUDING THE CITIES OF GREENVILLE AND DURANT...SHOULD MONITOR
THESE STORMS CLOSELY.

MRM