150  
FXUS65 KMSO 252304  
AFDMSO  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MISSOULA MT  
504 PM MDT MON MAR 25 2019  
   
UPDATE
 
 
WE ISSUED A FLOOD ADVISORY FOR MUCH OF RAVALLI COUNTY AND ALSO  
UPDATED LOW TEMPERATURES TONIGHT.  
 

 
   
DISCUSSION
 
LATEST INDICATIONS SUGGEST THAT LOW TEMPERATURES  
TONIGHT MAY NOT GET MUCH BELOW FREEZING IN THE BITTERROOT AND  
MISSOULA VALLEYS. SOME LOCATIONS MAY ONLY COOL TO THE UPPER 30S.  
THIS WILL CAUSE FURTHER SNOWMELT AND KEEP THE THREAT OF OVERLAND  
FLOODING GOING THROUGH TUESDAY.  
 

 
   
PREV DISCUSSION
 
/ISSUED 246 PM MDT MON MAR 25 2019/  
 
DISCUSSION...  
 
DRY, WARM, AND BREEZY CONDITIONS WILL BE PRESENT THROUGH THE  
REMAINDER OF TODAY ACROSS MUCH OF THE NORTHERN ROCKIES.  
CONSIDERING THAT MANY VALLEYS ACROSS THE REGION DID NOT COOL TO  
BELOW FREEZING THIS MORNING, THE WARMTH AND WIND ARE FURTHER  
ACCELERATING MELTING SNOW AND RUNOFF AT LOW ELEVATIONS. FIELD  
FLOODING WILL CONTINUE TO BE A COMMON SIGHT AROUND THE AREA, WITH  
WATER RUNNING OVER SOME SECONDARY AND COUNTRY ROADWAYS. BEWARE OF  
DRIVING THROUGH WATER OF UNKNOWN DEPTH AND REMEMBER: TURN AROUND,  
DON'T DROWN.  
 
A FAST-MOVING PACIFIC COLD FRONT IS ANTICIPATED TO MOVE ACROSS THE  
NORTHERN ROCKIES LATE THIS EVENING THROUGH TUESDAY AFTERNOON.  
PRECIPITATION AMOUNTS APPEAR MINIMAL FOR MUCH OF THE REGION, WITH  
PERHAPS A QUICK 1-2 INCHES SNOWFALL OVER HIGH TERRAIN. SOME VALLEY  
LOCATIONS ACROSS WESTERN MONTANA MAY ONCE AGAIN NOT COOL TO  
BELOW FREEZING, ALLOWING SNOW MELT TO FURTHER INTENSIFY. KEEP AN  
EYE ON LOCAL SEASONAL STREAMS AND CREEKS. FIELD FLOODING IS LIKELY  
TO CONTINUE BEING AN ISSUE AT THIS TIME. DAYTIME TEMPERATURES WILL  
COOL 5-10 DEGREES ACROSS THE REGION COMPARED TO TODAY.  
 
LITTLE HAS CHANGED OVER THE PAST 24 HOURS WITH OUR CHANGE TO A MORE  
ACTIVE PATTERN ACROSS THE NORTHERN ROCKIES. WE STILL EXPECT  
WIDESPREAD PRECIPITATION TO MOVE INTO THE REGION LATE WEDNESDAY,  
AND LINGER THROUGH THE DAY ON THURSDAY. SNOW LEVELS WILL GENERALLY  
REMAIN AROUND 4500 FEET AND ABOVE FOR MOST OF THIS PERIOD.  
HOWEVER, EARLY THURSDAY MORNING, SNOW LEVELS ARE EXPECTED TO LOWER  
TO AROUND 3000 FEET GIVING THE MISSOULA/BITTERROOT VALLEYS, AND  
UPPER BLACKFOOT REGIONS A CHANCE FOR LIGHT SNOW ACCUMULATIONS. THE  
HIGHER COMMUNITIES OF SW MONTANA SUCH AS (PHILIPSBURG, BUTTE,  
ANACONDA, GEORGETOWN LAKE) COULD SEE A FEW INCHES OF SNOW OF  
AROUND 6 INCHES OR MORE. NORTH-CENTRAL IDAHO COMMUNITIES AROUND  
DIXIE, ELK CITY, AND LEADORE OF LEMHI COUNTY, WONT MISS OUT  
EITHER, WHERE A FEW INCHES ARE ALSO POSSIBLE. EVEN THOUGH MOST  
VALLEYS ALONG AND SOUTH OF INTERSTATE 90 WILL PRIMARILY SEE RAIN,  
THE WELL BELOW NORMAL TEMPERATURES ALONG WITH THE INCREASED  
MOISTURE WILL MAKE IT FEEL QUITE COLD TO END THE WEEK. THE RAIN  
AND SNOW WILL REMAIN OVER THE REGION INTO FRIDAY AS THE LOW  
PRESSURE SYSTEM WILL BE SLOW TO MOVE OUT. MORE SNOW FOR THE  
MOUNTAINS, AND A RAIN/SNOW MIX IN THE VALLEYS FOR A PERIOD OF TIME  
IS ALSO EXPECTED FRIDAY.  
 
THE EXTENDED FORECAST GOING INTO NEXT WEEK, LOOKS TO REMAIN ACTIVE  
WITH BELOW NORMAL TEMPERATURES.  
 
AVIATION...FAIR CONDITIONS ACROSS THE NORTHERN ROCKIES THIS  
AFTERNOON AND EVENING WILL TRANSITION TO SOLID OVERCAST AFTER  
26/0600Z, AS A PACIFIC COLD FRONT MOVES ACROSS THE REGION. KGPI  
AND KMSO HAVE THE BEST CHANCE OF LOWERED CEILINGS AND  
PRECIPITATION DURING THE 26/1200Z - 26/1800Z PERIOD. LOWERED  
CEILINGS AND PRECIPITATION WILL SHIFT TOWARD KSMN AND KBTM DURING  
26/1800Z - 27/0000Z. TERRAIN OBSCURATIONS WILL FOLLOW THE  
AFOREMENTIONED PROGRESSION OF PRECIPITATION FEATURES ALONG THE  
COLD FRONT (FROM NORTHWEST TO SOUTHEAST). TERRAIN OBSCURATIONS  
WILL LESSEN AFTER 27/0600Z.  
 

 
   
MSO WATCHES/WARNINGS/ADVISORIES
 
 
MT...NONE.  
ID...NONE.  

 
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab MT Page
The Nexlab ID Page Main Text Page