Severe Thunderstorm Warning 442, NWS Jackson, MS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON MS
300 AM CDT MON JUN 11 2001

SURFACE LOW LOCATED NEAR NEW ORLEANS. CIRCULATION IS INDICATED VERY
WELL IN THE LATEST 88D AND RADAR IMAGES. RAIN IS FALLING OVER THE
EXTREME SOUTHEAST CWFA...WITH THE HEAVIEST ACTIVITY OVER
FOREST...LAMAR AND MARION COUNTIES. ONE HOUR AMOUNTS ARE UNDER HALF
AN INCH AN HOUR...WHICH IS WELL BELOW FLASH FLOOD GUIDANCE FOR THAT
AREA.

THERE ARE SOME SLIGHT DIFFERENCES BETWEEN THE ETA AND AVN THIS
PERIOD IN RESPECT TO HOW THEY HANDLE THE SHORTWAVE ENERGY ASSOCIATED
WITH THE REMNANTS OF T.D. ALLISON...WITH THE AVN FASTER IN SHUNTING
THE BEST ENERGY NORTHEAST. OTHERWISE...MODELS ARE IN FAIRLY GOOD
AGREEMENT THIS RUN. SURFACE AND UPPER LEVEL LOW...BOTH CURRENTLY
OVER SOUTHEAST LOUISIANA...WILL MOVE EAST/NORTHEAST THROUGH THE
PERIOD...ENDING UP OVER EXTREME NORTHEAST GA BY 60 HOURS.

BOTH MODELS KEEP THE DEEPEST MOISTURE AND BEST UPPER LEVEL SUPPORT
OVER SOUTHEAST MISSISSIPPI TODAY...AND OVER THE EAST ON TUESDAY. THE
DELTA WILL BE THE FIRST TO RETURN TO A MORE NORMAL-LIKE SUMMER
PATTERN TODAY...WITH MAINLY AFTERNOON CONVECTION FIRING DURING THE
GREATEST DAYTIME HEATING. THE WESTERN HALF OF THE CWFA SHOULD RETURN
TO THIS PATTERN TOMORROW...WITH THE EFFECTS OF THE SURFACE AND UPPER
LEVEL LOW BEGINNING TO LOOSEN THEIR HOLD ON THE EASTERN HALF OF THE
CWFA LATE TUESDAY.  BY WEDNESDAY...THE ENTIRE CWFA SHOULD RETURN TO
A MORE DIURNAL CONVECTION REGIME...WHICH WILL CONTINUE INTO THE EXTENDED
FORECAST UNTIL THE NEXT FRONTAL BOUNDARY APPROACHES LATE FRIDAY.

GUIDANCE: TEMP GUIDANCE LOOKS FINE AND WILL ONLY MAKE SLIGHT CHANGES
ACCORDING TO CLOUD COVER. AS FAR AS POPS GO...TRENDING WITH HIGHEST
POPS IN THE SOUTHEAST AND LOWEST IN THE NORTHWEST. MAV GUIDANCE FOR
THE SOUTHEAST ZONES LOOKS KINDA FLAKY AS ONLY LOW END CHANCE POPS
ARE FORECAST FOR TODAY...NEEDLESS TO SAY...WILL UP TO CATEGORICAL AS
PRECIP WILL BE ONGOING AT THE BEGINNING OF THE PERIOD...AND WILL
REMAIN LIKELY THROUGH TONIGHT AS SURFACE LOW TRACKS SOMEWHERE
BETWEEN MERIDIAN AND THE COAST. WILL HAVE THE HIGHEST POPS OVER THE
EASTERN HALF OF THE CWFA ON TUESDAY AS SYSTEM TRACKS NORTHEASTWARD
AND SHORTWAVE ENERGY LINGERS OVER THIS AREA. BY LATE
TUESDAY...CONVECTION SHOULD DIE OFF SHORTLY AFTER SUNSET IN THE WEST
AND BEGIN WANING IN THE EAST AS SYSTEM MOVES FURTHER AND FURTHER
AWAY.

THE ONGOING EXTENDED FORECAST LOOKS OK AND WILL ONLY MAKE COSMETIC
CHANGES.

NO NEED FOR FLASH FLOOD WATCH OVER SOUTHEAST ZONES AS HEAVIEST
PRECIP IS SHOULD STAY TO THE SOUTH. LATEST RAINFALL ESTIMATES ARE
WELL BELOW FLASH FLOOD GUIDANCE AND LOOK TO STAY THAT WAY THROUGH 24
HOURS. NCEP GUIDANCE...AND MODELS...KEEP THE HEAVIEST RAINFALL TO
OUR SOUTH...WITH 24 HOUR QPF TOTALS BELOW AN INCH IN THE EXTREME
SOUTHEAST CWFA.

PRELIM NUMBERS...
JAN 86/69/89/71 5332
MEI 84/68/868/70 6443

.JAN...
MS...NONE.
LA...NONE.
AR...NONE.
32

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
121200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
600 AM CDT MON JUN 11 2001

...THUNDERSTORMS...
SHOWERS AND THUNDERSTORMS ARE LIKELY SOUTHEAST OF A LINE FROM DEKALB TO
CARTHAGE TO COLUMBIA TODAY. PERIODS OF SHOWERS AND THUNDERSTORMS CAN BE
EXPECTED OVER THE EXTREME SOUTHEAST CORNER OF MISSISSIPPI. ISOLATED STORMS
SOUTH OF A LINE FROM LAUREL TO MONTICELLO MAY BECOME SEVERE TODAY. THE
PRIMARY SEVERE WEATHER THREAT WILL BE DAMAGING WIND.

THERE IS A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS OVER SOUTHEAST
ARKANSAS... NORTHEAST LOUISIANA AND WEST MISSISSIPPI. SCATTERED
THUNDERSTORMS MAY DEVELOP OVER CENTRAL AND NORTHEAST SECTIONS OF
MISSISSIPPI DURING THE AFTERNOON.

PERIODS OF THUNDERSTORMS WILL OCCUR OVER SOUTHEAST MISSISSIPPI TODAY AS A
LOW PRESSURE SYSTEM NEAR NEW ORLEANS MOVES TO THE NORTHEAST. THE LOW WILL
CROSS THE EXTREME SOUTHEAST CORNER OF MISSISSIPPI THIS AFTERNOON.
THE AIR MASS WILL REMAIN MOIST AND UNSTABLE ENOUGH FOR THE CHANCE OF
THUNDERSTORMS OVER CENTRAL AND NORTHEAST MISSISSIPPI WITH A SLIGHT CHANCE
OF AFTERNOON THUNDERSTORMS DEVELOPING OVER WESTERN AREAS.

THE LOW CENTER WILL SHIFT INTO SOUTHWEST ALABAMA DURING THE EVENING. THE
CHANCE OF THUNDERSTORMS WILL END OVER SOUTHEAST ARKANSAS...NORTHEAST
LOUISIANA AND WEST MISSISSIPPI EARLY TONIGHT. THE BEST CHANCE OF
THUNDERSTORMS WILL CONTINUE OVER SOUTHEAST MISSISSIPPI THROUGH EARLY
TUESDAY MORNING.

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL SHOULD NOT
BE REQUIRED THROUGH TONIGHT.

...FLOODING...
BRIEF PERIODS OF HEAVY RAIN ARE POSSIBLE OVER SOUTHEAST MISSISSIPPI
TODAY...GENERALLY SOUTH OF A LINE FROM QUITMAN TO MONTICELLO. A LOW
PRESSURE SYSTEM NEAR NEW ORLEANS WILL MOVE ACROSS THE SOUTHEAST CORNER OF
MISSISSIPPI THIS AFTERNOON AND TRACK INTO SOUTHWEST ALABAMA DURING THE
EVENING. OCCASIONAL THUNDERSTORMS WILL OCCUR TODAY. LOCAL RAINFALL RATES UP
TO ONE AND ONE HALF INCH AN HOUR COULD OCCUR IN HEAVIER STORMS. WATER MAY
BEGIN TO POND IN LOW LYING AREAS AND ON ROADWAYS.

RAINFALL WILL DECREASE FROM THE WEST BY LATE AFTERNOON AS THE LOW PRESSURE
SYSTEM CONTINUES TO MOVE EAST.

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