HYDROLOGIC OUTLOOK

000
FGUS76 KSEW 071833
ESFSEW
WAC009-027-031-045-057-061-073-082230-
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE SEATTLE WA
1133 AM PDT THU OCT 7 2010
...HEAVY RAINFALL THIS WEEKEND MAY CAUSE MINOR FLOODING ON SOME
RIVERS FLOWING OFF THE OLYMPICS AND NORTH CASCADES...
A SERIES OF WET FRONTAL SYSTEMS ARE EXPECTED TO PRODUCE HEAVY
RAINFALL ALONG THE SOUTH SLOPES OF THE OLYMPICS AND TO THE NORTH
CASCADES THIS WEEKEND. AT THIS POINT...IT APPEARS THAT THE
HEAVIEST RAINFALL WILL OCCUR IN TWO PULSES.
THE FIRST WAVE WILL OCCUR FRIDAY NIGHT AND EARLY SATURDAY MORNING
AS A STRONG WARM FRONT MOVES NORTHEAST ACROSS THE AREA. RAINFALL
TOTALS OF 2 TO 4 INCHES ARE EXPECTED IN THE OLYMPICS. THE NORTH
CASCADES WILL LIKELY SEE 1 TO 3 INCHES OF RAIN WITH THIS FIRST
FRONT. SNOW LEVELS ARE EXPECTED TO BE ABOVE 10000 FEET.
AFTER A BREAK IN THE PRECIPITATION LATE SATURDAY MORNING AND
SATURDAY AFTERNOON...A STRONG WARM FRONT WILL MOVE NORTHEAST
ACROSS THE AREA SATURDAY NIGHT AND WILL BE FOLLOWED BY A COLD
FRONT SUNDAY MORNING. RAINFALL AMOUNTS DURING THIS PERIOD ARE
EXPECTED TO RANGE FROM 3 TO 5 INCHES IN THE OLYMPICS...AND 2 TO 4
INCHES IN THE NORTH CASCADES. SNOW LEVELS WILL REMAIN ABOVE 10000
FEET.
FLOODING...IF IT DOES OCCUR...WOULD BE MORE LIKELY WITH THE SECOND
WAVE. WHILE THE GREATEST RISK OF MINOR FLOODING WILL BE ON THE
SKOKOMISH RIVER IN MASON COUNTY SATURDAY NIGHT OR SUNDAY...OTHER
RIVERS FLOWING OFF THE SOUTH SLOPES OF THE OLYMPICS AND THE NORTH
CASCADES COULD APPROACH FLOOD STAGE ON SUNDAY.
$$
ALBRECHT
WEATHER.GOV/SEATTLE