Flash Flood Warning 54, NWS Little Rock, AR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
320 AM CDT WED APR 9 2008

.DISCUSSION...
MAIN CONCERNS THIS FORECAST CYCLE ARE SEVERE WEATHER OUTBREAK ON
THURSDAY...AND WITH PERIODS OF HEAVY RAIN WHICH WILL ADD TO THE
RIVER FLOODING...AND FLASH FLOOD POTENTIAL. WILL BE ISSUING A
FLASH FLOOD WATCH THIS MORNING FOR TODAY THROUGH THURSDAY PM FOR
ALL OF AR.

CURRENTLY...CONVECTION CONTINUES TO FIRE ALONG THE WEAK BOUNDARY
AND THETA-E GRADIENT OVER CENTRAL AR...AS UPPER LEVEL ENERGY
LIFTS ACROSS THE AREA. A FEW PULSE STORMS HAVE BEEN SEEN THIS
EARLY MORNING OVER AR AND BACK TO THE SW...BUT MAIN CONCERN THIS
MORNING IS RAIN AMOUNTS AND ANY FLASH FLOODING. HAVE SEEN
REGENERATION OF STORMS BACK TO THE SW OVER NE TEXAS...WITH THESE
STORMS CONTINUING TO MOVE OVER SOUTH-CENTRAL AND CENTRAL AR. THE
SURFACE DID PUSH MORE OVER NORTHERN AR...WITH 40 DEWPOINT AIR AND
KEEPING RAIN CHANCES LOW OVER THE NORTH. 60 DEWPOINT AIR ALONG AND
SOUTH OF THE BOUNDARY. 00Z KZLK SOUNDING HAD THE PRECIP WATER
VALUE UP TO 1.2I INCHES...WITH A VEERING PROFILE OF 25-35 KNTS
SURFACE TO 10K FT. IR SATELLITE HAS THE ENERGY OVER NE TX LIFTING
INTO AR...WHILE OUT WEST OVER THE 4 CORNERS AREA...THE NEXT
DEVELOPING UPPER SYSTEM FOR OUR THURSDAY WEATHER.

&&

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT
HAVE UPPED POP THIS MORNING TO CATEGORICAL FOR CENTRAL AR WITH
CURRENT TRENDS...SOME HEAVY RAIN...AND FLASH FLOOD WATCH WILL GO
OUT FOR ALL OF AR AT MORNING ISSUANCE. CURRENT BOUNDARY WILL STALL
OVER CENTRAL AR...AND HELP FOCUS CONVECTION TODAY. MODELS TO
WEAKEN OVERALL LIFT DURING THE DAY...AND LOWERED POP A BIT. TODAYS
SLIGHT RISK FROM SPC GOOD...BUT WOULD BE VERY ISOLATED OVER AR
DURING THE DAY. THEN THE BOUNDARY LIFTS NORTHWARD WEDNESDAY
EVENING AS THE SURFACE AND UPPER SYSTEM TAKE SHAPE OVER NORTH TX.
STRONG LIFT MOVES NE OVER OK...NW AR TO MO THROUGH 06Z FRIDAY...
THEN FOCUSES BACK WEST TO THE SURFACE AND UPPER LOWS BY 12Z
THURSDAY. ON THURSDAY...MAX LIFT...AN 850MB 50-70KT JET WITH
VEERING PROFILE...UPPER LEVEL JET...LI OF -2 TO -6...AND CAPE
AROUND 1000 J/KG WILL LEAD TO SEVERE STORMS...WITH ISOLATED
TORNADOES ACROSS AR. SPC CURRENT DAY 2 MODERATE RISK IN ORDER. AROUND
00Z FRIDAY...THE SEVERE STORMS ARE EXPECTED TO BE PUSHING ACROSS
EASTERN PARTS OF AR WITH THE MAIN DYNAMICS...AS THE SURFACE LOW
LIFTS N-NE TO KS/MO. STRONG WINDS BEHIND THE COLD FOR FRIDAY WITH
PRECIP ENDING IN THE MORNING. WRAP AROUND MOISTURE WILL STILL KEEP
CLOUDS OVER THE AREA...WITH SMALL CHANCE OF RAIN THROUGH AT LEAST
MID-DAY. CLEARING FRIDAY NIGHT...WITH COLD ADVECTION TAKING TEMPS
WELL BELOW APRIL NORMALS FOR SATURDAY. STILL SOME CLOUDS ON
SATURDAY...ESPECIALLY IN THE NORTH...WHILE PARTLY TO MOSTLY SUNNY
CENTRAL AND SOUTH. WINDS REMAIN ELEVATED DUE TO THE STRONG
PRESSURE GRADIENT WITH THE STORM. HIGH PRESSURE BUILDS IN FOR THE
REST OF THE WEEKEND.

&&

.LONG TERM...SUNDAY THROUGH TUESDAY
MODELS ALL CONTINUE TO ADVERTISE A DRY EXTENDED PERIOD WITH A HIGHLY
AMPLIFIED UPPER FLOW IN PLACE. WITH NO MAJOR DIFFERENCES BETWEEN THE
MEDIUM RANGE MODELS...AT LEAST ONES THAT WILL EFFECT THE MID
SOUTH...WILL CONTINUE TO FOLLOW THE MORE CONSISTENT GFS SOLUTION
THIS MORNING.

PERIOD INITIATES WITH LARGE RIDGE OVER THE ROCKIES...ANCHORED BY
LARGE EASTERN PACIFIC AND EASTERN CONUS TROFS. SLOW MOVING UPPER LOW
OVER SOUTHEAST CANADA WILL STILL KEEP SOME CLOUDS OVER THE AREA
EARLY SUNDAY WITH GENERALLY CLEAR SKIES AFTER THAT AS SURFACE RIDGE
OVER THE CENTRAL PLAINS MOVES EAST AND BECOMES THE DOMINATE WEATHER
FEATURE THROUGH THE REMAINDER OF THE PERIOD.

UPPER PATTERN REMAINS HIGHLY AMPLIFIED THROUGH MOST OF THE PERIOD
ALTHOUGH RIDGE IS FLATTENED OUT SOMEWHAT LATE IN THE PERIOD AS UPPER
LOW MOVES ONSHORE OVER THE PACIFIC NORTHWEST. WITH PRONOUNCED NORTH
TO NORTHWEST FLOW IN PLACE...TEMPERATURES WILL AVERAGE WELL BELOW
NORMAL ON SUNDAY AND TO A LESSER EXTENT MONDAY. AS PATTERN RELAXES
SOMEWHAT ON DAY SEVEN...TEMPERATURES WILL WARM TO JUST BELOW NORMAL
FOR MID APRIL. OVERNIGHT LOWS LIKELY TO DIP INTO THE 30S ACROSS THE
NORTHERN HALF OF THE FORECAST AREA SUNDAY NIGHT AND THEN JUST THE
NORTH MONDAY NIGHT. SOME OF THE NORMALLY COLDER AREAS WILL LIKELY
TOUCH FREEZING. MAV/MEX NUMBERS LOOK GOOD ARE GENERALLY ACCEPTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
BATESVILLE AR     62  59  74  56 /  70  60  70  70
CAMDEN AR         74  66  78  59 /  60  30  60  80
HARRISON AR       61  56  72  50 /  20  80  80  40
HOT SPRINGS AR    67  62  74  57 /  80  40  80  50
LITTLE ROCK   AR  66  62  75  59 /  80  40  80  70
MONTICELLO AR     75  66  81  61 /  60  20  50  80
MOUNT IDA AR      66  61  74  55 /  50  50  80  40
MOUNTAIN HOME AR  61  56  73  52 /  30  70  80  40
NEWPORT AR        63  61  75  59 /  70  50  70  80
PINE BLUFF AR     70  65  77  60 /  80  30  60  90
RUSSELLVILLE AR   62  59  75  53 /  50  60  80  40
SEARCY AR         63  61  75  58 /  80  50  80  80
STUTTGART AR      66  64  77  61 /  60  40  60  90
&&

.LZK WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH THROUGH THURSDAY EVENING FOR ARKANSAS-BAXTER-
BOONE-BRADLEY-CALHOUN-CLARK-CLEBURNE-CLEVELAND-CONWAY-DALLAS-
DESHA-DREW-FAULKNER-FULTON-GARLAND-GRANT-HOT SPRING-INDEPENDENCE-
IZARD-JACKSON-JEFFERSON-JOHNSON-LINCOLN-LOGAN-LONOKE-MARION-
MONROE-MONTGOMERY-NEWTON-OUACHITA-PERRY-PIKE-POLK-POPE-PRAIRIE-
PULASKI-SALINE-SCOTT-SEARCY-SHARP-STONE-VAN BUREN-WHITE-WOODRUFF-
YELL.

&&

SHORT TERM...59 / LONG TERM...56

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
358 AM CDT WED APR 9 2008

ARZ046-047-057-090945-
ARKANSAS-MONROE-PRAIRIE-
358 AM CDT WED APR 9 2008

...SIGNIFICANT WEATHER ALERT FOR ARKANSAS...MONROE AND PRAIRIE
COUNTIES UNTIL 445 AM CDT...

AT 357 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR STUTTGART MUNICIPAL AIRPORT...MOVING
NORTHEAST AT 20 MPH.

WIND GUSTS BETWEEN 40 AND 50 MPH ARE EXPECTED WITH THIS STORM.

FREQUENT...DANGEROUS LIGHTNING IS OCCURRING WITH THIS STORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE
INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS
AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY.

56