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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KRLX 250824
AFDRLX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON WV
410 AM EDT FRI JUL 25 2014

.SYNOPSIS...
HIGH PRESSURE AND WEAK WINDS INTO FRIDAY. STRONG WARM AIR ADVECTION
SATURDAY. A SERIES OF DISTURBANCES IN A WEST/NORTHWEST FLOW ALOFT
WITH ROUNDS OF CONVECTION MAINLY SATURDAY NIGHT THRU SUNDAY NIGHT.

&&

.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
VAD WINDS AT 925 MB BLOWING A BIT STRONGER AT 08Z...THAN WAS
FIGURING. KRLX FOR EXAMPLE WAS 15 TO 20 KNOTS. BUT STILL FIGURING ON
IT TO BE WEAKENING THROUGH DAWN.  HAVE AREAS OF FOG OR LOW STRATUS
CLOUDS IN THE WESTERN SLOPES...MOSTLY FROM SUTTON AREA ON S AND SW
TO THE TUG FORK BORDER WITH EASTERN KENTUCKY. SOME EVAPORATING/
SHRINKING AREAS OF LOW CLOUDS STILL POSSIBLE AT 13 TO 14Z IN THESE
WESTERN SLOPES AREAS.

OVER SOUTHERN MOUNTAINS...ALSO FIGURING ON PATCHES OF FOG AND LOW
CLOUDS THROUGH DAWN...THEN LIFTING A BIT SOONER INTO SCATTERED
CLOUDS.

FURTHER WEST AND NORTH...IN THE COOLER AIR...MAYBE SOME PATCHY FOG
ALONG WATERWAYS 11-12Z.

HAVE SUBSIDENCE INVERSION AT THE TOP OF THE MIXING LAYER AROUND 5
THSD FT MSL TODAY.  WITH LIGHT WINDS TODAY...FIGURING ON LIMITED
MIXING...SO DID NOT MAKE ANY BIG ADJUSTMENTS UPWARDS IN THE MAXIMUM
TEMPERATURE FORECAST FOR TODAY.  DEW POINTS IN THE SOUTH SHOULD
STILL LOWER A BIT THIS AFTERNOON.

PICTURING A FAIRLY PLEASANT LATE JULY FRIDAY EVENING.  HAVE JUST
SOME HIGH CLOUDS STREAKING IN OVERNIGHT.  ANY FOG DURING THE LATE
NIGHT AND EARLY SATURDAY MORNING HOURS SHOULD BE LIMITED TO THE
DEEPER MOUNTAIN VALLEYS.  BOUNDARY LAYERS WINDS START TO INCREASE
06Z TO 12Z SATURDAY IN THE OHIO VALLEY COUNTIES.
-- End Changed Discussion --

&&

.SHORT TERM /SATURDAY THROUGH MONDAY NIGHT/...
-- Changed Discussion --
THERE IS REASONABLE MODEL AGREEMENT ON THE MASS AND QPF FIELDS THIS
PERIOD...INDICATING A VERY UNSETTLED PERIOD. THE PATTERN UNDERGOES
AMPLIFICATION...WITH THE SOUTHERN EDGE OF THE WESTERLIES ACROSS THE
OHIO VALLEY TRANSITIONING INTO A MEAN EASTERN U.S. UPPER TROUGH. ONE
SHORT WAVE TRACKS ACROSS THE GREAT LAKES SATURDAY...DRAGGING A WARM
FRONT NORTHEAST ACROSS THE AREA. BELIEVE THE MODELS ARE ON THE RIGHT
TRACK IN KEEPING MOST OF THE CONVECTION ASSOCIATED WITH THIS FRONT
NORTH OF THE AREA...ESPECIALLY AS THE VIGOROUS SOUTHWEST TO WEST 850
MB LOW LEVEL JET STAYS GENERALLY TO THE NORTH AT THIS TIME. WILL PUT
LOWER CHANCE POPS NORTH SATURDAY...AND KEEP THE SOUTH DRY. WITH MORE
SUNSHINE AND SOUTHERLY FLOW...EXPECT TEMPERATURES SATURDAY TO REACH
INTO THE MID AND UPPER 80S WITH INCREASING HUMIDITY.

SATURDAY NIGHT INTO SUNDAY NIGHT LOOK TO BE QUITE STORMY AND
WET...AHEAD OF A SIGNIFICANT COLD FRONT THAT WILL CROSS THE AREA
LATER SUNDAY NIGHT AND EARLY MONDAY. GOOD UPPER DYNAMICS FROM A
VIGOROUS SHORT WAVE SUPPORTING THE COLD FRONT...WILL COMBINE WITH
PW`S AROUND 2 INCHES AND A MODERATE LOW LEVEL WESTERLY 850 MB JET
AHEAD OF THE FRONT...TO BRING WIDESPREAD SHOWERS AND THUNDERSTORMS.
A FEW OF THE STORMS MAY BE SEVERE PER SPC OUTLOOK...WITH LOCALLY
HEAVY RAINS. HOWEVER...ALTHOUGH THE MODELS DRAG HEAVY QPF AMOUNTS
RIGHT ACROSS OUR AREA...IF THE ANTICIPATED MCS`S DROP SOUTHWARD TO
THE WEST OF OUR AREA PER 1000-500 MB THICKNESS ORIENTATION...THAT
WOULD DRASTICALLY LESSEN THE RAIN AMOUNTS FOR OUR AREA. THUS...WILL
STICK TO A PROLONGED PERIOD OF POPS IN THE LIKELY RANGE. THIS WILL
STILL WARRANT MENTION OF POSSIBLE WATER PROBLEMS IN THE HAZARDOUS
WEATHER PRODUCT...ALONG WITH POSSIBLE SEVERE STORMS.

MONDAY WILL BE THE TRANSITION DAY AS THE COLD FRONT EXITS...WITH
PRECIP DECREASING FROM WEST TO EAST AND MUCH COOLER TEMPERATURES
OVERSPREADING THE AREA.
-- End Changed Discussion --

&&

.LONG TERM /TUESDAY THROUGH THURSDAY/...
LINGERING SHOWERS ARE POSSIBLE AS THE LAST SHORTWAVE EXITS THE
EASTERN MOUNTAINS. GRADUALLY REDUCED POPS SUNDAY NIGHT INTO EARLY
MONDAY MORNING. ANOTHER COLD FRONT APPROACHES THE AREA FROM THE
NORTHWEST EARLY MONDAY MORNING...KEEPING THE POSSIBILITY FOR MORE
PCPN.

HIGH PRESSURE BEHIND THE COLD FRONT TAKES CONTROL LATER MONDAY
THROUGH THE MIDDLE OF NEXT WEEK WITH NEAR NORMAL TEMPERATURES.

FUSED A BLEND OF
DIFFERENT GUIDANCE...KEPT WARMER TEMPS FOR A MUGGY SUNDAY NIGHT.
LOW TURN NORTHWEST BY MONDAY BRINGING COOLER PLEASANT TEMPERATURES
DURING THE FIRST HALF OF THE WEEK.

&&

.AVIATION /08Z FRIDAY THROUGH TUESDAY/...
-- Changed Discussion --
HIGH PRESSURE AND WEAK WINDS INTO FRIDAY.

HAVE WIDESPREAD FOG AND LOW STRATUS FORMING OVERNIGHT FOR CENTRAL
AND SOUTHERN WEST VIRGINIA INTO EASTERN KENTUCKY. FOG FORMING LATER
AND MORE ALONG RIVERS IN THE COOLER AND DRIER AIR MASS ALONG ROUTE
50 CORRIDOR...SAY UNI...PKB TO CKB.

IN THE WEAK LOW LEVEL FLOW...FIGURING LOW STRATUS IN THE SUTTON TO
CRW TO HTS AND WILLIAMSON CORRIDOR LINGERING FOR 12Z TO 14Z...AND
BREAKING UP AROUND 14Z TO 15Z.

WITH PATCHES OF FOG AND LOW STRATUS...THE SOUTHERN PLATEAU AROUND
BECKLEY COULD EASILY HAVE VARIABLE LOW CEILINGS AND VSBY
OVERNIGHT.

AFTER 17Z..MOSTLY SCATTERED CLOUDS AT 3 TO 5 THSD FT AGL.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 06Z SATURDAY...

FORECAST CONFIDENCE: MEDIUM.

ALTERNATE SCENARIOS: TIMING THE AREAL COVERAGE OF THE LINGERING LOW
STRATUS IN THE WESTERN SLOPES AFTER 12Z AND WHEN IT EVAPORATES
COULD VARY.

EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH:   TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW:    TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

DATE                    FRI 07/25/14
UTC 1HRLY       08   09   10   11   12   13   14   15   16   17   18   19
EDT 1HRLY       04   05   06   07   08   09   10   11   12   13   14   15
CRW CONSISTENCY  L    L    L    L    L    L    M    M    H    H    H    H
HTS CONSISTENCY  L    L    L    L    L    L    M    M    H    H    H    H
BKW CONSISTENCY  L    L    L    L    L    L    H    M    M    M    H    H
EKN CONSISTENCY  L    L    L    L    L    L    H    H    H    H    H    H
PKB CONSISTENCY  L    L    L    L    L    L    H    H    H    H    H    H
CKB CONSISTENCY  L    L    L    L    L    L    H    H    H    H    H    H

AFTER 06Z SATURDAY...
IFR POSSIBLE IN ROUNDS OF CONVECTION SATURDAY NIGHT INTO SUNDAY
NIGHT.
-- End Changed Discussion --

&&

.RLX WATCHES/WARNINGS/ADVISORIES...
WV...NONE.
OH...NONE.
KY...NONE.
VA...NONE.

&&

$$
SYNOPSIS...KTB/JMV
NEAR TERM...KTB
SHORT TERM...JMV
LONG TERM...ARJ
AVIATION...KTB