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Alert Administrative Message
Issued by NWS Missoula, MT

000
NOUS75 KMSO 171655
ADMMSO

ADMINISTRATIVE MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1000 AM MDT FRI MAY 17 2013

TO ALL WFOS SURROUNDING WFO MSO
FM WFO MSO

WFO MSO HAS ISSUED A HEADS-UP EMAIL TO OUR EMERGENCY MANAGEMENT
COMMUNITY AND OTHER PARTNERS.

EMAIL TOPIC...HEAVY RAIN EXPECTED NEXT WEEK

...REASONING IN EMAIL...
A LOW PRESSURE SYSTEM WILL DEVELOP AND SIT OFF THE NORTHWESTERN
COAST MID WEEK NEXT WEEK.  A LOT OF MOISTURE WILL BE PRESENT WITH
THIS SYSTEM AND HAS THE POTENTIAL TO SPREAD VERY HEAVY RAIN OVER THE
AREA ON WEDNESDAY.  SNOW LEVELS ARE EXPECTED TO BE HIGH ENOUGH THAT
THE MOUNTAINS WILL LIKELY RECEIVE MAINLY, IF NOT ALL RAIN.  WITH
RIVER LEVELS ALREADY HIGH, THIS ADDITIONAL RAIN AND SNOWMELT COULD
CAUSE VERY RAPID RISES IN THE RIVERS AND STREAMS. AT THIS TIME WE
ARE MOST CONCERNED ABOUT STREAMS AND SMALL RIVERS.

THERE IS,
HOWEVER SOME UNCERTAINTY OF WHERE THE EXACT LOCATION OF THE LOW
PRESSURE WILL SETUP.  IF THE LOW SETS UP FURTHER EAST FROM ITS
CURRENT PROJECTION, COOLER AIR WILL HELP DROP THE SNOW LEVELS AND
HELP ALLEVIATE ANY ADDITIONAL RUNOFF.  THE LOCATION OF THE HEAVIEST
RAIN IS ALSO IN QUESTION, THOUGH CONFIDENCE HAS GROWN CONSIDERABLY
THAT, GLACIER NATIONAL PARK AND THE MAJORITY OF FLATHEAD COUNTY WILL
SEE THE HEAVIEST RAINS.

POSSIBLE RAINFALL AMOUNTS
WEDNESDAY:

GLACIER NATIONAL PARK
WEST ENTRANCE TO LOGAN PASS;
>1.00 INCH

VALLEYS
KALISPELL AND SURROUNDING VALLEYS; 0.50-0.75
INCHES

THERE IS ALSO THE POTENTIAL FOR VERY STRONG THUNDERSTORMS
TUESDAY EVENING WITH HEAVY RAIN.  IF THIS OCCURS, IT WILL ADD TO THE
CONCERNS, BY PRIMING THE GROUND BEFORE THE HEAVY AND MORE CONTINUOUS
RAIN ARRIVES WEDNESDAY.

IF YOU HAVE QUESTIONS OR CONCERNS...DO NOT HESITATE TO CALL OR
CHAT US.