Frost Advisory 3, NWS Missoula, MT

772 
WWUS75 KMSO 210950
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
350 AM MDT WED SEP 21 2011

MTZ003-005-211500-
/O.CON.KMSO.FR.Y.0003.000000T0000Z-110921T1500Z/
FLATHEAD/MISSION VALLEYS-MISSOULA/BITTERROOT VALLEYS-
350 AM MDT WED SEP 21 2011

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING...

A FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM MDT THIS MORNING. 

* IMPACTS/TIMING: TEMPERATURES IN THE LOWER 3OS WILL RESULT IN
  AREAS OF FROST EARLY THIS MORNING. A FEW LOCATIONS COULD SEE
  TEMPERATURES DROP INTO THE UPPER 20S FOR A HARD FREEZE AT
  DAYBREAK.

* TEMPERATURES:30-34...LOCALLY 27-30.

* PERSONS WITH FROST SENSITIVE PLANTS WILL WANT TO TAKE THE 
  PROPER PRECAUTIONS TO PROTECT THEM AGAINST THE FROST. 

* LOCATIONS IMPACTED INCLUDE...FLATHEAD LAKE...FLATHEAD VALLEY...
   MISSION VALLEY...POLSON...BITTERROOT VALLEY...MISSOULA

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

492 
WWUS75 KMSO 211449
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
849 AM MDT WED SEP 21 2011


MTZ003-005-211600-
/O.EXP.KMSO.FR.Y.0003.000000T0000Z-110921T1500Z/
FLATHEAD/MISSION VALLEYS-MISSOULA/BITTERROOT VALLEYS-
849 AM MDT WED SEP 21 2011

...FROST ADVISORY WILL EXPIRE AT 9 AM MDT THIS MORNING...

THE FROST ADVISORY WILL EXPIRE AT 9 AM MDT THIS MORNING. 

TEMPERATURES HAVE WARMED TO ABOVE FREEZING THIS MORNING AND FROST
IS NO LONGER AN IMPACT.


$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
640 AM MDT TUE SEP 20 2011

.DISCUSSION...AREAS OF DENSE FOG HAVE BEEN REPORTED THIS MORNING
ACROSS NORTHWEST MONTANA...PARTICULARLY BETWEEN COLUMBIA FALLS AND
CRESTON AND IN THE GLACIER NATIONAL PARK AREA. THEREFORE HAVE
ADDED MENTION OF DENSE FOG IN THESE AREAS THROUGH MID MORNING.
PATCHY FOG IS EXPECTED IN THE REMAINING VALLEYS OF NORTHWEST
MONTANA AND NORTH CENTRAL IDAHO.

&&

.AVIATION...AREAS OF VALLEY FOG HAVE DEVELOPED THIS MORNING...PARTICULARLY
ACROSS NORTHWEST MONTANA AND NORTH CENTRAL IDAHO. LOCALLY DENSE
FOG IS POSSIBLE IN THESE LOCATIONS...PERIODICALLY RESTRICTING
VISIBILITY. KGPI IS NOT CURRENTLY BEING AFFECTED BUT MAY SEE A
PERIOD OF REDUCED VISIBILITY AROUND SUNRISE. FOG IS EXPECTED TO LIFT BY
MID MORNING. OTHERWISE...LITTLE IMPACT TO AVIATION IS EXPECTED
TODAY AS A RIDGE OF HIGH PRESSURE BRINGS MOSTLY SUNNY SKIES AND
LIGHT WINDS TO THE REGION.

&&

.PREV DISCUSSION... /ISSUED 340 AM MDT TUE SEP 20 2011/

DISCUSSION...A DEVELOPING RIDGE OF HIGH PRESSURE WILL BE THE
PROMINENT WEATHER FEATURE OVER THE NORTHERN ROCKIES THROUGH THE
REMAINDER OF THE WEEK. UNDER THE BUILDING RIDGE...TEMPERATURES
WILL BEGIN TO WARM SIGNIFICANTLY TO MUCH ABOVE NORMAL FOR THIS
TIME OF YEAR BY WEDNESDAY. CURRENTLY...THE WARMEST DAY OF THE WEEK
IS EXPECTED TO COME ON SATURDAY AS THE MAIN RIDGE AXIS BRIEFLY
SHIFTS OFF TO THE EAST ALLOWING FOR BETTER ATMOSPHERIC MIXING. IN
FACT...TEMPERATURES MAY APPROACH NEAR RECORD HIGHS SATURDAY. NIGHT
TIME TEMPERATURES WILL REMAIN FAIRLY COOL IN THE VALLEY LOCATIONS
THROUGH THE WEEK AS STRONG NIGHT TIME INVERSIONS DEVELOP. UNDER
THESE INVERSIONS...SOME PATCHY VALLEY FOG IS POSSIBLE...PARTICULARLY
THIS MORNING AND WEDNESDAY MORNING ACROSS NORTHWEST MONTANA AND
NORTH CENTRAL IDAHO. A SIGNIFICANT DRYING TREND IS ALSO IN STORE UNDER
THIS UPPER LEVEL RIDGE...BRINGING MOSTLY CLEAR SKIES TO THE
REGION. FORECAST MODELS BEGIN TO INDICATE THE POSSIBILITY OF THE
RIDGE SHIFTING FURTHER EASTWARD WITH A POSSIBLE COLD FRONT PASSAGE
EARLY TO MID NEXT WEEK. THERE IS A LOT OF INCONSISTENCY WITH THE
MODELS IN THE TIMING AND STRENGTH OF THIS FEATURE HOWEVER SO
CONFIDENCE REMAINS FAIRLY LOW AT THIS TIME.

&&

NOTE: FLOOD WATCHES...WARNINGS AND ADVISORIES WILL NOT BE LISTED BELOW.

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

PALLISTER/ROBINSON