880  
FXUS65 KPIH 212020  
AFDPIH  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE POCATELLO ID  
220 PM MDT TUE MAY 21 2019  
   
SHORT TERM
 
TONIGHT THROUGH FRIDAY. EARLY AFTERNOON SATELLITE  
IMAGERY WAS HIGHLIGHTING A LOW PRESSURE SYSTEM SHEARING ACROSS  
OREGON INTO THE GREAT BASIN. NUMERICAL MODELS GENERALLY KEEP SE  
IDAHO WET AND COOL THROUGH WEDNESDAY EVENING AS THE LOW DIGS INTO  
SRN NEVADA. A LULL IN ACTIVITY IS ANTICIPATED LATE WEDNESDAY NIGHT  
AND THURSDAY MORNING AS THE LOW GRADUALLY LIFTS INTO SRN UTAH.  
WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS WILL REDEVELOP ACROSS  
THE REGION THURSDAY AFTERNOON AS THE LOW BEGINS TO EJECT NNE INTO  
WRN WYOMING BY LATE AFTERNOON. ANOTHER LULL IN ACTIVITY FOLLOWS LATE  
THURSDAY NIGHT INTO FRIDAY MORNING AS THE AFOREMENTIONED LOW LIFTS  
INTO THE DAKOTAS AND YET ANOTHER DISTURBANCE DIGS SSE OUT OF WRN  
CANADA INTO WASHINGTON/OREGON FRIDAY AFTERNOON. ONCE AGAIN,  
WIDESPREAD DIURNAL SHOWER AND ISOLATED THUNDERSTORM ACTIVITY IS  
EXPECTED TO DEVELOP ACROSS SE IDAHO AS A RESULT OF THE APPROACHING  
LOW. CLOUDY OVERNIGHT CONDITIONS SHOULD HELP TO HOLD OFF ANY  
FROST/FREEZE CONCERNS WITHIN THE SNAKE RIVER PLAIN OVER THE NEXT  
SEVERAL NIGHTS. MODERATE DOWNVALLEY/NE WINDS ARE EXPECTED TO DEVELOP  
WITHIN THE SNAKE RIVER PLAIN WEDNESDAY MORNING AND CONTINUE THROUGH  
THE DAY RESULTING IN ADVISORY LEVEL LAKE WIND SPEEDS ACROSS AMERICAN  
FALLS RESERVOIR. DAYTIME TEMPS REMAIN WELL BELOW NORMAL THROUGH  
THURSDAY AND THEN BEGIN TO MODERATE SOME FRIDAY. HUSTON  
   
LONG TERM
 
FRIDAY NIGHT THROUGH TUESDAY. THE EXTENDED FORECAST  
STILL LOOKS WET OVERALL. FRIDAY MODELS SHOW AN UPPER LEVEL TO OUR  
WEST DROPPING SOUTH WITH WEAK HIGH PRESSURE RIDGING BUILDING IN FROM  
THE SOUTHEAST. SHOWERS WILL BACK OFF SOME BUT STILL EXPECT ISOLATED  
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON SATURDAY. MODELS THEN  
MOVE THE LOW NORTHEAST BRINGING MOISTURE BACK INTO OUR AREA LATE  
SUNDAY INTO MONDAY. EXPECT LINGERING SHOWERS TUESDAY AS THE LOW  
MOVES EAST AWAY FROM OUR AREA. TEMPERATURES WILL BE SLIGHTLY BELOW  
NORMAL FRIDAY NIGHT INTO SATURDAY AND THEN WARM SLIGHTLY TO NEAR  
NORMAL SUNDAY. MONDAY AND TUESDAY EXPECT TEMPERATURES BACK BELOW  
NORMAL AS THE NEXT SYSTEM IMPACTS THE AREA. WYATT  

 
   
AVIATION
 
MOISTURE FROM AN UPPER LEVEL IS IMPACTING THE AREA  
THIS AFTERNOON. EXPECT MOSTLY VFR CONDITIONS WITH BRIEF MVFR/IFR  
CONDITIONS EXPECTED WITH SHOWERS ON STATION. SHOWERS WILL SUBSIDE  
SOME THIS AFTERNOON INTO THE EARLY EVENING. HOWEVER, MODELS ARE  
SHOWING SHOWERS BECOMING MORE WIDESPREAD BY EARLY TO MID TOMORROW  
MORNING. EXPECT MVFR/IFR CONDITIONS WITH SHOWERS ON STATION TOMORROW  
MORNING. EXPECT OVERALL LIGHT WINDS AND SWITCHING FROM THE NORTHEAST  
BY TOMORROW MORNING FOR THE SNAKE RIVER PLAIN AND DRIGGS. WYATT  

 
   
FIRE WEATHER
 
EXPECT NO FIRE WEATHER IMPACTS IN THE NEXT WEEK. IT  
WILL BE A PERIOD OF VERY WET CONDITIONS WITH COOL TEMPERATURES AND  
HIGH RELATIVE HUMIDITY. DO EXPECT SOME WARMING THIS WEEKEND. - GK  

 
   
HYDROLOGY
 
THREE PACIFIC STORM SYSTEMS WILL WORK THROUGH THE  
REGION OVER THE COURSE OF THE NEXT SEVEN DAYS. WELL BELOW NORMAL  
TEMPERATURES THROUGH FRIDAY SHOULD HELP TO KEEP RIVER LEVELS IN  
CHECK. WARMING TEMPERATURES OVER THE WEEKEND AND EARLY NEXT WEEK  
WITH ADDITIONAL RAINFALL MAY BRING SOME OF THE BASINS BACK INTO  
ACTION STAGE. FOR NOW, THE BIG WOOD AT HAILEY IS EXPECTED TO REMAIN  
BANKFULL THROUGH FRIDAY. HUSTON  

 
   
PIH WATCHES/WARNINGS/ADVISORIES
 
 
LAKE WIND ADVISORY FROM 9AM TO 9 PM WEDNESDAY FOR IDZ054.  

 
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab ID Page Main Text Page