weather.gov     
National Weather Service

Area Forecast Discussion
NWS Homepage
This page is being discontinued on March 12, 2014.
The same data is available at this site. Please update your bookmarks.
Thank you, and we apologize for the inconvenience.
Please send an email to SR-SRH.Webmaster@noaa.gov with any concerns.


Current Version
Previous Version:    01  02  03  04  05  06  07  08  09  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  
   31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  
[Printable]
150
FXUS61 KILN 260507
AFDILN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WILMINGTON OH
107 AM EDT SUN OCT 26 2014

.SYNOPSIS...
IN THE WAKE OF A COLD FRONT...CLEAR SKIES CAN BE EXPECTED
OVERNIGHT. CLEAR AND COOL CONDITIONS TONIGHT WILL BE FOLLOWED A
BY A SUNNY SUNDAY WITH HIGHS IN THE 60S AND LOW HUMIDITY. A WARM
FRONTAL PASSAGE MONDAY MORNING WILL BRING A RETURN FLOW OF GUSTY
SOUTHERLY WINDS...AND TEMPERATURES MONDAY AFTERNOON WILL SOAR WELL
INTO THE 70S...WITH AN OUTSIDE THREAT OF 80S IN KENTUCKY AND
SOUTHERN INDIANA. A STRONG COLD FRONT WILL SHIFT THROUGH ON
TUESDAY BRINGING A BAND OF SHOWERS AND A FEW THUNDERSTORMS ALONG
WITH IT. MOST AREAS WILL SEE AT LEAST SOME LIGHT TO MODERATE RAIN
AMOUNTS AS THE FRONT PASSES.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
SFC HIGH PRESSURE NOSE BUILD INTO THE REGION IN THE WAKE OF A
WEAK COLD FRONT PASSAGE. SKIES HAVE CLEARED ACRS ILN/S FA. TEMPERATURES
ARE STILL MILD WITH READINGS AT LATE EVENING FROM THE MID 50S NW
TO THE MID 60S SE. WEST-NORTHWEST LOW LEVEL FLOW WILL ALLOW SOMEWHAT
DRIER AIR TO FILTER IN. THIS PROCESS WILL TAKE SOME TIME AND WHERE
HIGHER LOW LEVEL MOISTURE LINGERS ACRS THE SOUTH AND SOUTHEAST HAVE
ADDED A MENTION OF PATCHY FOG OVERNIGHT. HAVE ONLY TWEAKED TEMPERATURES
SLIGHTLY WARMER IN SOME LOCATIONS WITH LOWS FROM NEAR 40 NORTH TO
THE MID/UPR 40S FAR SOUTH.


PREVIOUS DISCUSSION...
A COLD FRONT IS CURRENTLY ANALYZED ACROSS OHIO INTO SOUTHERN
INDIANA AND PRESSING EAST. BKN STRATUS OUT AHEAD OF THIS FEATURE
HAS JUST ABOUT CLEARED THE FORECAST AREA...WITH NOTHING BUT CLEAR
SKIES ALL THE WAY TO THE ROCKIES. SO A PRETTY STRAIGHTFORWARD FORECAST
FOR TONIGHT. THINK THERE MAY BE SOME SHALLOW/VALLEY FOG IN SOME
AREAS...BUT ANALYSIS OF MOISTURE TRENDS /RAP AND NAM LOWEST 100MB
MIXING RATIOS/ SUGGESTS DRYING WILL REALLY TAKE HOLD ESP AFTER
MIDNIGHT ACROSS IND/OH. HAVE A LITTLE CONCERN IN NORTHERN KY GIVEN SREF
VISIBILITY PROBABILITY RELATIVE MAX ACROSS THE SOUTHERN 1/2 OF KENTUCKY AND
GOES SYNTHETIC FOG PRODUCT SHOWING POTENTIAL OF FOG/STRATUS
DEVELOPMENT OVER MUCH OF KY AFTER MIDNIGHT. SO OBSERVATIONAL
TRENDS WILL HAVE TO BE MONITORED ACROSS OUR SOUTH LATER ON EVENING
FOR PERHAPS SOME INCLUSION OF FOG INTO THE FORECASTS. FOR LOW
TEMPS - KEPT VERY CLOSE TO THE PREVIOUS FORECAST WITH A NUDGE TOWARD
SOME INTERNAL BIAS-CORRECTION TO ENHANCE THE WARM/COOL PRONE AREAS
ON STRONG RADIATIONAL COOLING NIGHTS.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH MONDAY NIGHT/...
A DELIGHTFUL SUNDAY IN STORE AS SHORTWAVE RIDGING BUILDS ACROSS
THE OHIO VALLEY DURING THE DAY AND SURFACE HIGH PRESSURE CROSSES
OH/KY INTO WV BY SUNDAY EVENING. EXTREMELY DEEP/DRY TROPOSPHERE
IS ATTENDANT TO THESE FEATURES...WITH LOWEST 100MB MIXING
RATIO/DEW POINT TRENDS TIED VERY STRONG TO AIRMASS CURRENTLY SEEN OVER
MN/ND WHERE DEWPOINTS HAVE MIXED INTO THE UPPER 20S. PRECIPITABLE WATER FORECASTS
FROM VARIOUS NWP SUGGEST 0.25" WHICH IS ABOUT 40% OF NORMAL. WILL
ALLOW DEWPOINTS TO MIX OUT IN THE AFTERNOON INTO THE LOWER/MID 30S
UNDER BRIGHT SUNSHINE AND LIGHT NORTHWESTERLY BOUNDARY LAYER FLOW. WILL NOT
BE SURPRISED TO SEE DEWPOINTS INTO THE UPPER 20S IN A FEW
SPOTS...PARTICULARLY WCNTL OH/ECNTL IND. WEAK COLD ADVECTION ESP THE FIRST
1/2 OF THE DAY KEEPS MAX TEMPS IN THE 60S. AGAIN...KEPT TEMPS
TRENDED VERY CLOSE TO PREVIOUS FORECAST WHICH LINED UP FAIRLY WELL WITH
MIXING GFS/NAM 925MB TEMPS TO THE SURFACE. A QUINTESSENTIAL FALL DAY
IN THE OHIO VALLEY.

SUNDAY NIGHT...START TO RETURN FLOW WITH WINDS BACKING TO
SOUTHERLY DURING THE NIGHT AND NOT FALLING OFF. THIS SHOULD YIELD
A SLIGHTLY MILDER NIGHT SAVE FOR THE SCIOTO VALLEY WHICH WILL
STILL BE IN CLOSE ENOUGH PROXIMITY TO THE SURFACE HIGH FOR BETTER
DECOUPLING.

MONDAY...THINK RAPIDLY DEVELOPING WARM ADVECTION IN THE LOWER
TROPOSPHERE AND MOISTURE ADVECTION MAY LEAD TO A BAND OF LOW/MID
CLOUDS ALONG AND IN ADVANCE OF THE SURFACE WARM FRONT. BROUGHT SKY
COVER UP TO THE 50-65% RANGE FOR A FEW HOURS AS WE TRANSITION THE
SYNOPTIC WARM FRONT FROM SW TO NE ACROSS THE AREA MONDAY MORNING.
THIS SHOULD OPEN THE DOOR FOR STRONG WARM ADVECTION IN THE AFTERNOON AS LOW
LEVEL FLOW INCREASES. BOUNDARY LAYER WINDS TO BECOME GUSTY /25
MPH/ IN THE AFTERNOON AS DEWPOINTS BEGIN TO RAPIDLY CLIMB. SOME
DETAILED TEMP ANALYSIS SUGGESTS A RUN AT 80 DEGREES NOT OUT OF THE
QUESTION IN THE SOUTHERN/WESTERN HALF OF THE FORECAST AREA. RECENT
NAM RUNS /AND CONTINUING ON 25.12Z NAM/ HAVE BEEN THE WARMEST
SUGGESTING +16C TO EVEN +17C 850MB TEMPS /2 SIGMA ABOVE CLIMO/
WILL BE BODILY ADVECTED INTO THE AREA BY MID AFTERNOON WITH 925MB
TEMPS NEAR +19C. SOUNDING CLIMATOLOGY SUGGESTS AN 850MB TEMP OF
+17C ON OCTOBER 27TH WOULD BE THE 2ND WARMEST 850MB TEMP FOR THIS
LATE IN THE SEASON EVER ON THE ILN SOUNDING CLIMATOLOGY. THAT /AND
THE +2 SIGMA STANDARD DEVIATION/ SUGGESTS WE CONSIDER RECORD OR
NEAR RECORD HIGH TEMPS...ESPECIALLY GIVEN SUNSHINE AND MIXING. BUT
AM GOING TO KEEP TEMPS A FEW DEGREES BELOW RECORDS MAX TEMPS /LOW
80S AT CMH/CVG/DAY FOR THE FOLLOWING REASONS: 1) COMPONENT OF
BOUNDARY LAYER IS TOO SOUTHERLY FOR MY LIKING - WOULD LIKE TO SEE
MORE 240/250 /WSW/ DEGREE WIND DIRECTION INSTEAD OF 190/200
DEGREE /SSW/ WIND DIRECTION 2) BIG BOUNDARY LAYER MOISTURE
INCREASE WITH DEWPOINTS RISING ALL DAY THROUGH THE 50S - THIS
DECREASES LOW LEVEL LAPSE RATES AND SUGGESTS MIXING BEYOND 900MB
WILL BE UNATTAINABLE 3)INCREASING CIRRUS SHOULD FILTER AT LEAST A LITTLE
BIT OF SUN 4) ARRIVAL OF WARMEST 925MB AIR IS LATE IN THE
AFTERNOON -- NOT IN PLACE DURING THE DAY LIKE FURTHER TO THE SW 5)
925MB TEMP CLIMO SUGGESTS THE FORECAST +19C BY NAM IS NOT QUITE AS
ATYPICAL FOR THIS LATE IN THE YEAR...AND GIVEN THE 925MB TEMP IS A
MUCH BETTER PROXY TO HIGH TEMP AROUND PER LOCAL REGRESSION
EQUATIONS...WILL HALT TEMPS FROM REACHING RECORD LEVELS AND
INSTEAD STOP THEM A COUPLE DEGREES SHORT...OR MID 70S IN THE NORTH
TO NEAR 80 IN THE FAR SOUTH/WEST. PREVIOUS/RECENT DAYS WITH TEMP
STRUCTURE LIKE MONDAY WAS OCTOBER 30TH 2009 - CVG HIT 80F AND CMH
79. THIS WAS WITH AN 850MB TEMP OF +17C. IT WILL BE VERY CAPPED ON
MONDAY SO DRY FORECAST AND ONLY SOME HIGH CLOUD.

WITH THE WINDS STAYING UP MONDAY NIGHT AND A MAINTENANCE OF THE
VERY WARM LOWER TROPOSPHERIC WARMTH MENTIONED ABOVE...WILL SKEW
LOWS WAY ON THE WARM SIDE OF THE BLENDED GUIDANCE...KEEPING LOWS
IN THE LOWER 60S. WILL HOLD OFF ON RAIN MENTION WITH THE
APPROACHING FRONT INTO TUESDAY /DISCUSSED BELOW/.

&&

.LONG TERM /TUESDAY THROUGH SATURDAY/...
A MID LEVEL SHORT WAVE MOVING FROM THE NORTHERN PLAINS AND INTO THE
GREAT LAKES REGION WILL HELP DRIVE A COLD FRONT THROUGH THE OHIO
VALLEY TUESDAY INTO TUESDAY EVENING. WITH GOOD LOW LEVEL MOISTURE
CONVERGENCE DEVELOPING OUT AHEAD OF THE FRONT...EXPECT SHOWERS TO
PUSH IN FROM THE NORTHWEST TUESDAY MORNING...WORKING INTO OUR
SOUTHEAST THROUGH TUESDAY AFTERNOON. WILL CONTINUE WITH A MENTION OF
THUNDER ACROSS OUR ENTIRE FA...BUT EXPECT THE BEST CHANCE TO BE
ACROSS ABOUT THE SOUTHEAST HALF OF OUR FA WHERE SOME SLIGHTLY BETTER
INSTABILITIES WILL BE PULLED UP INTO THE AREA THROUGH TUESDAY
AFTERNOON. WILL ALSO LIKELY SEE A DECENT TEMPERATURE GRADIENT ACROSS
OUR AREA WITH HIGHS ON TUESDAY RANGING FROM THE MID/UPPER 60S
NORTHWEST TO MID 70S SOUTHEAST. AS THE FRONT PUSHES OFF TO THE
EAST...PCPN WILL TAPER OFF FROM THE NORTHWEST TUESDAY EVENING...AND
ACROSS THE SOUTHEAST THROUGH THE OVERNIGHT HOURS.

SURFACE HIGH PRESSURE AND A COOLER AIRMASS WILL BUILD INTO THE AREA
WEDNESDAY INTO THURSDAY. EXPECT HIGHS BOTH DAYS ONLY IN THE MID TO
UPPER 50S. SHORT WAVE ENERGY DROPPING DOWN ACROSS THE GREAT LAKES
WILL THEN HELP CARVE OUT A DEEPENING TROUGH OVER THE EASTERN UNITED
STATES THROUGH THE END OF THE WEEK. AS THIS SHORT WAVE DROPS DOWN
INTO OUR AREA...EXPECT A CHANCE OF SHOWERS TO DEVELOP LATER THURSDAY
NIGHT AND INTO THE DAY ON FRIDAY. THIS WILL ALSO BE ACCOMPANIED BY A
REINFORCING SHOT OF COLDER AIR. TEMPERATURES WILL BE WELL BELOW
NORMAL TOWARD THE END OF THE WEEK WITH HIGHS ON FRIDAY IN THE UPPER
40S TO LOWER 50S...COOLING INTO THE MID TO UPPER 40S BY SATURDAY. IT
ALSO LOOKS LIKE THE POTENTIAL FOR A FAIRLY WIDESPREAD FREEZE LATER
FRIDAY NIGHT INTO SATURDAY MORNING.

&&

.AVIATION /05Z SUNDAY THROUGH THURSDAY/...
VERY QUIET WEATHER CONDITIONS ARE EXPECTED THROUGH THE TAF
PERIOD...WITH CLEAR SKIES EXPECTED THROUGH THE NEXT 24 HOURS. WNW
FLOW WILL CONTINUE OVERNIGHT...INCREASING IN STRENGTH SLIGHTLY ON
SUNDAY. ON SUNDAY NIGHT...WINDS WILL BECOME MUCH LIGHTER...BEFORE
SHIFTING TO THE SOUTHWEST.

.OUTLOOK...THUNDERSTORMS ARE POSSIBLE ON TUESDAY.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...NONE.
KY...NONE.
IN...NONE.

&&

$$
SYNOPSIS...BINAU
NEAR TERM...AR
SHORT TERM...BINAU
LONG TERM...JGL
AVIATION...HATZOS







U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE