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395
FGUS85 KMSO 071855
RVSMSO
IDC035-049-059-MTC023-029-039-047-053-061-063-077-081-089-093-081900-

HYDROLOGIC STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
1155 AM MST FRI FEB 7 2014 /1055 AM PST FRI FEB 7 2014/

...ICE REMAINS IN CREEKS AND RIVERS THROUGHOUT WESTERN MONTANA AND
PARTS OF NORTH CENTRAL IDAHO...

RECORD COLD TEMPERATURES THIS PAST WEEK HAVE FILLED MOST RIVERS
AND CREEKS WITH ICE. LATEST WEATHER FORECASTS ARE INDICATING A
SLOW WARM UP IN TEMPERATURES THIS WEEKEND AND INTO NEXT WEEK.

ICE THAT CURRENTLY REMAINS IN CREEKS AND RIVERS MAY STILL LEAD TO
ICE JAMMING AS WE MOVE INTO THE WEEKEND. WHEN ICE JAMS FORM THEY
CAN BEGIN TO RESTRICT THE FLOW OF WATER. THE RESULT OF THE
RESTRICTED FLOW CAN LEAD TO WATER BACKING UP BEHIND THE ICE JAM
AND SPREADING THE WATER INTO THE FLOODPLAIN BEHIND THE ICE JAM.
THIS TYPE OF ICE JAM FORMATION IS CALLED A FREEZE-UP ICE JAM.

IN NORTH CENTRAL IDAHO:
ICE JAMMING IS OCCURRING ON THE SALMON RIVER AND THE LATEST
REPORTS INDICATE THE ICE JAM IS NOW 6 MILES NORTH OF SALMON. AN
ICE JAM OBSERVER IN SALMON REPORTS WATER IS SLOWLY BACKING UP
BEHIND THE ICE JAM IN THE 6 MILE AREA NORTH OF SALMON. WATER IS
SPREADING INTO SOME FIELDS IN THE AREA.

IN WESTERN MONTANA:
MOST CREEKS AND RIVERS ACROSS THE AREA HAVE ICE IN THE CHANNELS
AND ICE JAM FORMATION IS STILL POSSIBLE AS WE MOVE THROUGH THE
WEEKEND.

$$








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