238
FXUS66 KOTX 172320
AFDOTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
420 PM PDT WED OCT 17 2018
SYNOPSIS
A RIDGE OF HIGH PRESSURE WILL PERSIST OVER THE INLAND NORTHWEST
THROUGH THE WEEK AND INTO THE WEEKEND. THIS WILL BRING MAINLY
CLEAR SKIES, LIGHT WINDS WITH CHILLY MORNING TEMPERATURES AND
MILD AFTERNOONS HIGHS. THE NEXT CHANCE OF PRECIPITATION LOOKS LIKE
IT COULD ARRIVE BY NEXT TUESDAY OR WEDNESDAY.
DISCUSSION
VERY LITTLE CHANGE IN OUR CURRENT TRANQUIL WEATHER PATTERN IS
EXPECTED THROUGH THE WEEKEND. A BROAD BLOCKING HIGH PRESSURE RIDGE
WILL CONTINUE TO DEFLECT STORM SYSTEMS WELL NORTH OF OUR REGION.
THROUGH THE WEEKEND, THE INLAND NORTHWEST WILL CONTINUE TO
EXPERIENCE MAINLY CLEAR SKIES, LIGHT WINDS, CHILLY NIGHTS, AND
MILD AFTERNOONS.
TONIGHT: OVERNIGHT TEMPERATURES WILL AGAIN DIP INTO THE 30S OVER
THE MAJORITY OF EASTERN WASHINGTON AND NORTH IDAHO. OUR SHELTERED
VALLEYS AROUND REPUBLIC, DEER PARK, NEWPORT, AND PRIEST LAKE WILL
HAVE A GOOD SHOT OF MID TO UPPER 20S. POCKETS OF FOG WILL LIKELY
DEVELOP IN SPOTS ALONG THE PEND OREILLE RIVER AND AROUND PRIEST
LAKE SIMILAR TO LAST NIGHT. IN GENERAL OUR AIR MASS IS TOO DRY FOR
WIDESPREAD FOG, SO OUR CHILLIEST SHELTERED VALLEYS WITH WARM WATER
BODIES WILL BE THE MOST PRONE TO FOG.
THURSDAY THROUGH SATURDAY: NO SIGNIFICANT CHANGES HAVE BEEN MADE
TO THE FORECAST FOR THIS TIME FRAME. SEASONABLY CHILLY NIGHTS AND
MILD AFTERNOONS ARE EXPECTED. PERSISTENT HIGH PRESSURE WILL
CONTINUE TO PRODUCE MAINLY CLEAR SKIES AND LIGHT WINDS.
SUNDAY THROUGH WEDNESDAY: THE STRONG HIGH PRESSURE WILL CONTINUE
OVER THE AREA FOR SUNDAY AND MONDAY. ONE OF THOSE TWO DAYS WILL BE
THE WARMEST OF THIS EPISODE, WITH HIGHS IN THE MID 60 TO NEAR 70 ACROSS
THE REGION. THEN THE WEATHER PATTERN WILL TAKE A MARKED TURN AS
THE HIGH PRESSURE FINALLY MOVES OFF TO OUR EAST, OPENING THE
PACIFIC STORM DOOR.
THE FIRST FRONT WILL MOVE ONSHORE MONDAY NIGHT, REACHING THE
PANHANDLE BY TUESDAY AFTERNOON OR EVENING. IT'S TOO FAR INTO THE
FUTURE TO GET DETAILED ABOUT THE FORECAST, BUT I WOULDN'T RULE OUT
THE POSSIBILITY OF SOME THUNDERSTORMS ON THE LEADING EDGE OF THIS
FRONT. USUALLY WE DON'T SEE A LOT OF RAIN FROM THE FIRST FRONT,
SO THE GFS LOOKS A LITTLE OVERDONE TO ME. A SECOND WEATHER SYSTEM
WILL FOLLOW ON ITS HEELS, BRING THE POTENTIAL FOR MORE RAIN ON
WEDNESDAY. TEMPERATURES ON TUESDAY AND WEDNESDAY WILL FALL BACK
INTO THE MID 50S, MORE TYPICAL FOR LATE OCTOBER. RJ
AIR QUALITY
AIR QUALITY SENSORS ACROSS THE REGION ARE MAINLY IN THE GOOD TO
MODERATE RANGE. STRONG OVERNIGHT/MORNING INVERSIONS ARE A
BYPRODUCT OF BIG HIGH PRESSURE RIDGES THIS TIME OF THE YEAR.
SEVERAL WEB CAMERAS ACROSS THE INLAND NORTHWEST LOOK "HAZY" AS
POLLUTION CONCENTRATIONS BUILD UP UNDER THE INVERSION. WITH
ANOTHER 4 OR 5 DAYS OF LIGHT WINDS AND INVERSIONS, WE ARE WORKING
WITH AIR QUALITY AGENCIES TO URGE FOLKS TO ABIDE LOCAL BURN BANS.
EVEN THOUGH THESE WARM AND DRY DAYS SEEM PERFECT FOR BURNING
LEAVES AND YARD WASTE, WAITING TO BURN UNTIL NEXT WEEK IS THE
NEIGHBORLY THING TO DO. THE MEDIUM RANGE MODELS CONTINUE TO
FORECAST A PATTERN CHANGE AROUND TUESDAY OR WEDNESDAY WITH MORE
WIND FOR IMPROVED SMOKE DISPERSION. /GKOCH
AVIATION
00Z TAFS: HIGH PRESSURE WILL BRING MOSTLY CLEAR SKIES AND LIGHT
WINDS. YET SHALLOW FOG IS POSSIBLE NEAR RIVERS VALLEYS IN THE
MORNING, INCLUDING SFF. HAZE COLLECTING UNDER THE HIGH MAY PRODUCE
SOME VISIBILITY REDUCTIONS TOO, BUT NOTHING WIDESPREAD OR
PERSISTENT IS EXPECTED AT THIS TIME. IT WILL BE MONITORED. /COTE'
PRELIMINARY POINT TEMPS/POPS
SPOKANE 39 63 39 63 40 64 / 0 0 0 0 0 0
COEUR D'ALENE 36 66 37 65 37 66 / 0 0 0 0 0 0
PULLMAN 38 67 39 67 40 68 / 0 0 0 0 0 0
LEWISTON 40 68 41 68 42 69 / 0 0 0 0 0 0
COLVILLE 31 67 32 66 33 67 / 0 0 0 0 0 0
SANDPOINT 30 64 31 64 32 65 / 0 0 0 0 0 0
KELLOGG 34 65 35 64 36 66 / 0 0 0 0 0 0
MOSES LAKE 32 67 33 66 34 67 / 0 0 0 0 0 0
WENATCHEE 40 65 41 65 42 66 / 0 0 0 0 0 0
OMAK 33 67 36 67 37 67 / 0 0 0 0 0 0
OTX WATCHES/WARNINGS/ADVISORIES
ID...NONE.
WA...NONE.
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