000
FXUS63 KABR 140237 AAA
AFDABR

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE ABERDEEN SD
937 PM CDT THU JUN 13 2013

.UPDATE...
EXPECT LLJ CONVECTION OUT WEST THIS EVENING TO INCREASE THROUGH
THE NIGHT AS IT TRANSLATES EASTWARD. DELAYED CHANCES OF RAINFALL
ACROSS THE EAST UNTIL LATER TONIGHT.


&&
.PREVIOUS DISCUSSION...
.SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT
THE FORECAST CHALLENGE SURROUNDS CONVECTIVE POTENTIAL LATE TONIGHT
AND ON FRIDAY...AND WHETHER OR NOT ANY OF IT BECOMES STRONG TO
SEVERE.

CURRENTLY...HIGH PRESSURE IN PLACE AND A MOSTLY SUNNY SKY OVERHEAD
HAVE TEMPERATURES WARMING INTO THE 70S ACROSS THE CWA ON EAST TO
SOUTHEAST WINDS.

LATE TONIGHT THE RETURN FLOW/ELEVATED WAA PATTERN THAT SETS UP AS
HIGH PRESSURE SHIFTS EAST WILL SUPPORT ELEVATED SHOWER AND
THUNDERSTORM DEVELOPMENT MAINLY ACROSS THE WESTERN HALF OF THE
CWA. ANY EARLY MORNING CONVECTION WILL WORK NORTHEASTWARD ACROSS
THE REGION...LIKELY ENDING BY LATE MORNING. INCREASING EFFECTIVE
LAYER SHEAR AND EML INSTABILITY COULD BE ENOUGH TO GENERATE A
STRONG ELEVATED STORM OR TWO. BUT A GREATER THREAT FOR STRONG TO
SEVERE STORMS APPEARS TO RESIDE ACROSS THE EASTERN FORECAST AREA
/ALONG AND EAST OF THE JAMES RIVER VALLEY/ WHERE A SLIGHT RISK
AREA CONTINUES AT THIS TIME. AS A COLD FRONT SWEEPS ACROSS THE CWA
ON FRIDAY...A FEW STRONG TO SEVERE /SUPER CELLULAR/ THUNDERSTORMS
COULD DEVELOP...IF THE CAP CAN BE ERODED ENOUGH. A STRONG
MID-LEVEL WARM LAYER AT AND ABOVE 700HPA WILL BE IN PLACE WHICH
COULD END UP KEEPING THE LID ON AFTERNOON/EVENING CONVECTION.

THE MAJORITY OF FRIDAY NIGHT THROUGH SATURDAY NIGHT LOOKS TO BE
DRY WITH STABLE HIGH PRESSURE IN PLACE.


.LONG TERM...SUNDAY THROUGH THURSDAY

SHORTWAVE/OCCLUDED LOW WILL BE DRIFTING OVER THE NORTHER
PLAINS...FROM MANITOBA TO NORTHERN MINNESOTA SUNDAY NIGHT. TROF
PASSAGE WILL HAVE ALREADY OCCURRED...SO UNDER WEAK WESTERLY MID
LEVELS FLOW...AND A RELATIVELY DRY BOUNDARY LAYER...PROFILES
DURING PEAK HEATING WILL BE CONVECTIVELY UNSTABLE. COLD ADVECTION
TAKES OVER FOR THE START OF THE WORK WEEK...WITH H85 TEMPERATURES
DIPPING TO +10 TO +12C BY MONDAY PM.

THERE WILL BE A WEAK SHORTWAVE EMBEDDED WITHIN NORTHWEST FLOW
MONDAY PM AS WELL. SOUNDINGS AT THIS TIME ARE RELATIVELY
STABLE...SO EXPECTING DRY CONDITIONS WITH JUST A WIND SHIFT.

WARM ADVECTION KICKS IN LATE TUESDAY AS THE RIDGE AXIS STARTS TO
SHIFT EAST OF THE FORECAST AREA. WARMEST MID LEVEL AIR WILL
FOLLOW...DELAYED UNTIL THE END OF THE FORECAST PERIOD...LEAVING US
WITH SEVERAL DAYS IN WHICH WE COULD SEE MORE THUNDERSTORM
ACTIVITY.



&&

.AVIATION...
00Z TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS

A UPPER LOW PRESSURE TROUGH IN THE WESTERN US THIS EVENING WILL
KICK NORTHEAST AND INTO SOUTHERN CANADA AND CLOSE OFF THROUGH
FRIDAY EVENING. AS A RESULT...A SURFACE COLD FRONT WILL SWEEP
ACROSS THE REGION THROUGH FRIDAY EVENING. SCATTERED SHOWERS AND
THUNDERSTORMS IN FAR EASTERN WYOMING WILL SWEEP EAST ACROSS THE
CWA TONIGHT AND EARLY FRIDAY AS THE UPPER LEVEL FORCING ALONG WITH
AN INCREASING LLJ MOVE EASTWARD. SOME OF THESE SHOWERS AND STORMS
MAY AFFECT THE TERMINALS. DUE TO THE UNCERTAINTY AND
TIMING...LEFT OUT THE MENTION OF SHOWERS AND THUNDER AT THE TERMINALS
AT THIS TIME. ALSO...THE MODELS INDICATE THE LOW LEVEL MOISTURE
INCREASING THROUGH THE NIGHT AND EARLY FRIDAY. THUS...EXPECT AN
MVFR STRATUS DECK TO DEVELOP NORTHWARD INTO THE CWA LATER TONIGHT
AND EARLY FRIDAY AND TRANSLATE EASTWARD THROUGH FRIDAY EVENING. THIS
WILL THEN MIX OUT/BECOME VFR AS SURFACE HEATING INCREASES AND
DRIER AIR BEHIND THE COLD FRONT MOVES IN. IT SHOULD BECOME BREEZY
FROM THE SOUTH SOUTHEAST TONIGHT AND FRIDAY AT THE TERMINALS. THE
WINDS WILL THEN TURN NORTHWEST AND BREEZY AT 15 TO 20 KNOTS WITH
HIGHER GUSTS AT PIR AND MBG IN THE LATE MORNING AND AFTERNOON AS
HIGHER MOMENTUM AIR MIXES DOWN BEHIND THE COLD FRONT.


&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
&&

$$
UPDATE...MOHR
SHORT TERM...DORN
LONG TERM...CONNELLY
AVIATION...MOHR

WEATHER.GOV/ABERDEEN