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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