600
FXUS65 KBOI 190223
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
823 PM MDT MON MAR 18 2019
DISCUSSION
UPPER LEVEL RIDGE OVER THE REGION TONIGHT WILL
CONTINUE THE CLEAR SKIES THROUGH TUESDAY. THE PRESSURE GRADIENT
INCREASE TUESDAY AFTERNOON IN RESPONSE TO AN UPPER LEVEL TROUGH
APPROACHING THE WEST COAST. THIS SHOULD BRING BREEZY EAST-
SOUTHEASTERLY WINDS MAINLY ACROSS SOUTHEAST OREGON AND ALONG THE
IDAHO/NEVADA. CURRENT FORECAST REMAINS ON TRACK SO NO UPDATES
NEEDED AT THIS TIME.
AVIATION
VFR WITH MOSTLY CLEAR SKIES. SURFACE WINDS EAST OR
SOUTHEAST AROUND 10 KTS, INCREASING AFTER 19/18Z TO 15 TO 20 KTS.
WINDS ALOFT NEAR 10K FT MSL: EAST 10-15 KTS, INCREASING AFTER
19/18Z TO 20 TO 25 KTS.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH WEDNESDAY...HIGH PRESSURE WILL
CONTINUE TO DOMINATE THE AREA THROUGH THE BEGINNING OF THE PERIOD.
TEMPERATURES WILL CLIMB INTO THE LOW 60'S FOR LOWER VALLEYS
TUESDAY PEAKING ON WEDNESDAY IN THE MID 60'S. A TIGHTENING SURFACE
GRADIENT TUESDAY AS THE NEXT UPPER LEVEL TROUGH BEGINS TO PRESS
INTO THE COASTAL REGIONS WILL CAUSE GUSTY WINDS ALONG THE I-84
CORRIDOR SOUTH OF BOISE HEADING INTO MOUNTAIN HOME AND PARTS OF
THE MAGIC VALLEY. MUCH OF THE ENERGY STAYS TO OUR SOUTH WEDNESDAY
AS THE UPPER LEVEL TROUGH CONTINUES TO PRESS EASTWARD, BUT A FEW
SHOWERS ARE NOT OUT OF THE QUESTION DOWN ALONG OUR NEVADA BORDER.
LONG TERM...WEDNESDAY NIGHT THROUGH SATURDAY...MODELS CONTINUE IN
GOOD AGREEMENT ON BRINGING AN UPPER LEVEL TROUGH INLAND OVER THE
GREAT BASIN AND DESERT SOUTHWEST WEDNESDAY NIGHT AND THURSDAY. OUR
AREA WILL BE ON THE NORTHERN FRINGE OF THE PRECIPITATION, WITH
ISOLATED SHOWERS EXPECTED ACROSS SOUTHERN PORTIONS OF SOUTHEAST
OREGON AND SOUTH OF THE SNAKE RIVER VALLEY IN IDAHO. AS THIS SYSTEM
MOVES EAST, THERE WILL BE A BRIEF BREAK IN PRECIPITATION THURSDAY
NIGHT. THE NEXT UPPER LEVEL TROUGH WILL APPROACH FROM THE NORTHWEST
COAST ON FRIDAY, WITH ISOLATED SHOWERS IN SOUTHEAST OREGON AND ALONG
THE NEVADA BORDER IN IDAHO. SHOWERS WILL SPREAD EAST AND BECOME MORE
NUMEROUS FRIDAY NIGHT. ON SATURDAY WE CAN EXPECT WIDESPREAD RAIN
SHOWERS IN THE VALLEYS AND SNOW SHOWERS ABOVE 4000 FEET IN SOUTHEAST
OREGON AND 5500 FEET IN SOUTHWEST IDAHO. TEMPERATURES WILL AVERAGE
A FEW DEGREES ABOVE NORMAL THURSDAY AND FRIDAY AND NEAR NORMAL ON
SATURDAY.
SATURDAY NIGHT THROUGH MONDAY NIGHT...SHOWERY AND BREEZY ARE THE
EXPECTED CONDITIONS AT THE START OF THE PERIOD AS AN UPPER LEVEL
DISTURBANCE ROCKETS THROUGH THE REGION. CONDITIONS SHOULD RAPIDLY
IMPROVE BEGINNING SUNDAY MORNING AS MUCH DRIER RIDGING BEGINS TO
TAKE OVER, STARTING IN THE WEST AND SPREADING EASTWARD. LOOK FOR
THESE IMPROVING CONDITIONS TO PERSIST AND CONTINUE TO SPREAD UNTIL
TUESDAY WHERE ANOTHER SYSTEM STARTS TO ENTER FROM THE WEST. HIGH
TEMPERATURES ARE EXPECTED CLIMB TO NORMAL (AT THE START) AND
GRADUALLY INCREASE TO SLIGHTLY ABOVE (THE NEXT DAY). LOW
TEMPERATURES ARE EXPECTED TO DROP TO NEAR NORMAL (THROUGHOUT THE
PERIOD).
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
WWW.FACEBOOK.COM/NWSBOISE
WWW.TWITTER.COM/NWSBOISE
DISCUSSION...JDS
AVIATION.....LC
PREV SHORT TERM...JC
PREV LONG TERM....JT/WH
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