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3 products issued by NWS for: Pasco WA
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Winter Storm Watch

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE PENDLETON OR
1100 PM PST MON JAN 16 2017

...FREEZING PRECIPITATION LIKELY MONDAY NIGHT INTO WEDNESDAY...

.A PACIFIC STORM SYSTEM WILL AFFECT THE INTERIOR NORTHWEST
TONIGHT THROUGH MIDWEEK. WARMER AIR RIDING OVER THE RESIDUAL
ARCTIC AIRMASS WILL RESULT IN A POTENTIAL FOR FREEZING RAIN AND
SLEET WEDNESDAY AND WEDNESDAY NIGHT.

ORZ044-507-508-510-WAZ028-029-171400-
/O.CON.KPDT.WS.A.0004.170117T1800Z-170118T1500Z/
LOWER COLUMBIA BASIN OF OREGON-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
NORTH CENTRAL OREGON-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
INCLUDING THE FOLLOWING LOCATIONS...BOARDMAN...HERMISTON...IONE...
PENDLETON...PILOT ROCK...HEPPNER...CONDON...FOSSIL...DUFUR...
MAUPIN...CONNELL...PROSSER...TRI-CITIES...DAYTON...WAITSBURG...
WALLA WALLA
1100 PM PST MON JAN 16 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM 10 AM PST TUESDAY
THROUGH WEDNESDAY MORNING...

* LOCATIONS...PENDLETON...PILOT ROCK...BOARDMAN...HERMISTON...
  IONE...DUFUR...MAUPIN...CONNELL...PROSSER...TRI-CITIES...
  DAYTON... WAITSBURG...WALLA WALLA...HEPPNER...CONDON...FOSSIL.

* ICE ACCUMULATIONS...UP TO ONE HALF OF AN INCH.

* SNOW ACCUMULATIONS...1 TO 2 INCHES OF SLEET OR SNOW.

* TIMING...A LIGHT WINTERY MIX OF SLEET AND FREEZING RAIN WILL
  OCCUR LATE TUESDAY MORNING. STEADY FREEZING RAIN AND POSSIBLE
  SLEET WILL OCCUR TUESDAY NIGHT. TRANSITION TO MAINLY RAIN WILL
  BE WEDNESDAY MORNING.

* IMPACTS...ICE WILL MAKE ROADWAYS HAZARDOUS. ICE ACCUMULATIONS
  MAY CAUSE DOWNED TREE LIMBS AND POWER LINES.

* WINDS...EAST TO SOUTHEAST 5 TO 15 MPH.

* TEMPERATURES...IN THE MID 20S TO LOWER 30S.

* SNOW LEVEL...2000 FEET RISING TO ABOVE 3000 FEET.

* WEB PAGE: FOR A DETAILED VIEW OF THE HAZARD AREA VISIT
  HTTP://WWW.WRH.NOAA.GOV/MAP/?WFO=PDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.

MONITOR NOAA WEATHER RADIO FOR THE LATEST INFORMATION...
FORECASTS...AND WARNINGS.

&&

$$



Air Stagnation Advisory

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE PENDLETON OR
1038 PM PST MON JAN 16 2017

...AIR STAGNATION ADVISORY IN EFFECT THROUGH TUESDAY MORNING...

.HIGH PRESSURE WILL PREVAIL THROUGH TUESDAY MORNING. THIS HIGH
WILL KEEP A STRONG TEMPERATURE INVERSION OVER THE REGION WHICH
WILL TRAP POLLUTANTS NEAR THE SURFACE. SURFACE WINDS WILL STAY
BELOW 10 MPH. AREAS OF FREEZING FOG WILL ALSO BE POSSIBLE. A
STORM SYSTEM WILL START ERODING THE SURFACE INVERSION TUESDAY.

ORZ041-044-050-505-507-508-510-511-WAZ024-026>029-521-171400-
/O.CON.KPDT.AS.Y.0001.000000T0000Z-170117T1800Z/
EAST COLUMBIA RIVER GORGE OF OREGON-
LOWER COLUMBIA BASIN OF OREGON-WALLOWA COUNTY-JOHN DAY BASIN-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
NORTH CENTRAL OREGON-CENTRAL OREGON-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-SIMCOE HIGHLANDS-
INCLUDING THE CITIES OF...ARLINGTON...THE DALLES...BOARDMAN...
HERMISTON...IONE...ENTERPRISE...JOSEPH...WALLOWA...DAYVILLE...
JOHN DAY...MITCHELL...MONUMENT...SPRAY...PENDLETON...PILOT ROCK...
HEPPNER...CONDON...FOSSIL...DUFUR...MAUPIN...BEND...MADRAS...
PRINEVILLE...REDMOND...WHITE SALMON...ELLENSBURG...THORP...
NACHES...SUNNYSIDE...TOPPENISH...YAKIMA...CONNELL...PROSSER...
TRI-CITIES...DAYTON...WAITSBURG...WALLA WALLA...GOLDENDALE...
BICKLETON
1038 PM PST MON JAN 16 2017

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
TUESDAY...

* AIR QUALITY...MODERATE TO UNHEALTHY FOR SENSITIVE GROUPS.

* WINDS...VARIABLE UP TO 10 MPH.

* MIXING HEIGHTS...BELOW 1800 FEET ABOVE GROUND LEVEL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

AN AIR STAGNATION ADVISORY INDICATES THAT DUE TO LIMITED MOVEMENT
OF AN AIR MASS ACROSS THE ADVISORY AREA...POLLUTION HAS THE
POTENTIAL TO INCREASE TO DANGEROUS LEVELS. PERSONS WITH
RESPIRATORY ILLNESS SHOULD FOLLOW THEIR PHYSICIANS ADVICE FOR
DEALING WITH HIGH LEVELS OF AIR POLLUTION

DURING PERIODS OF STAGNANT AIR...STATE AIR QUALITY AGENCIES
HIGHLY RECOMMEND THAT NO OUTDOOR BURNING OCCUR AND THAT
RESIDENTIAL WOOD BURNING DEVICES BE LIMITED AS MUCH AS POSSIBLE.
ACCORDING TO STATE AIR QUALITY AGENCIES...PROLONGED PERIODS OF
STAGNANT AIR CAN HOLD POLLUTANTS CLOSE TO THE GROUND...WHERE
PEOPLE LIVE AND BREATHE. CHECK WITH YOUR LOCAL BURN AGENCY FOR
ANY CURRENT RESTRICTIONS IN YOUR AREA.

&&

$$



Hydrologic Outlook

Hydrologic Outlook
ORZ041-044-049-050-502-503-505>511-WAZ024-026>030-520-521-180000-

Hydrologic Outlook
National Weather Service Pendleton OR
255 PM PST Mon Jan 16 2017

...RAIN AND SNOWMELT MAY CAUSE LOCALIZED FLOODING ISSUES TOWARD
THE MIDDLE OF THE WEEK...

THE WEATHER PATTERN WILL CHANGE...BRINGING WARMER TEMPERATURES...RISING
SNOW LEVELS AND PERIODS OF RAIN TO MUCH OF THE AREA BEGINNING
TUESDAY NIGHT AND LASTING THROUGH AT LEAST THURSDAY. TOWARD THE
END OF THE WEEK AND NEXT WEEKEND WEATHER SYSTEMS WILL CONTINUE TO
BRING PERIODS OF LOWER ELEVATION RAIN AND MOUNTAIN SNOW TO THE
AREA.

SNOW LEVELS WILL RISE TO BETWEEN 6500 TO 8500 FEET TUESDAY NIGHT
THROUGH WEDNESDAY...EXCEPT 5500 TO 6500 FEET OVER THE BLUE
MOUNTAINS...WALLOWA COUNTY AND THE EAST SLOPES OF THE WASHINGTON
CASCADES. SNOW LEVELS THEN GRADUALLY FALL...REACHING 3500 TO 4000
FEET AREAWIDE DURING THE DAY THURSDAY. TOWARD THE END OF THE WEEK
AND INTO NEXT WEEKEND SNOW LEVELS SHOULD HOVER BETWEEN 2000 TO
3500 FEET MUCH OF THE TIME.

BELOW THESE SNOW LEVELS EXPECTED PERIODS OF RAIN...MODERATE AT
TIMES WITH THE FIRST BATCH MOVING THROUGH FROM TUESDAY NIGHT
THROUGH WEDNESDAY NIGHT. ANOTHER SYSTEM WILL BRING ADDITIONAL RAIN
AND HIGHER ELEVATION SNOW FROM LATE THURSDAY NIGHT THROUGH FRIDAY
NIGHT. PRECIPITATION AMOUNTS THROUGH THURSDAY ARE EXPECTED TO
RANGE FROM ONE QUARTER TO THREE QUARTERS OF AN INCH OVER THE LOWER
COLUMBIA BASIN...YAKIMA VALLEY...KITTITAS VALLEY AND THE LOWER
BASINS OF CENTRAL OREGON. PRECIPITATION AMOUNTS ARE EXPECTED TO
RANGE FROM 0.75 TO 1.5 INCHES IN THE SOUTHERN BLUE MOUNTAINS AND
THE GRANDE RONDE VALLEY. EXPECT BETWEEN 1 TO 2 INCHES...WITH
LOCALLY AS MUCH AS 3 INCHES OF PRECIPITATION ALONG THE EAST SLOPES
OF THE OREGON CASCADES...NORTHERN BLUE MOUNTAINS AND IN WALLOWA
COUNTY. THE EAST SLOPES OF THE WASHINGTON CASCADES CAN EXPECT
BETWEEN 2 TO 4 INCHES OF PRECIPITATION BY THURSDAY EVENING...WITH
THE HIGHEST AMOUNTS ALONG THE CASCADE CREST.

THESE PRECIPITATION AMOUNTS WILL COMBINE WITH THE AFOREMENTIONED
WARMER TEMPERATURES AND HIGH SNOW LEVELS TO CREATE SOME HYDROLOGIC
CONCERNS. MUCH OF THE RAIN SHOULD INITIALLY BE ABSORBED WITHIN
THE SNOW PACK...BUT EVENTUALLY THIS WILL BEGIN TO MELT...ESPECIALLY
IN THE LOWER ELEVATIONS. THIS RAIN ON SNOW SCENARIO WILL ADD
ADDITIONAL WEIGHT TO ALREADY STRESSED BUILDINGS AND ROOFS IN
LOCATIONS THAT CURRENTLY HAVE A DEEP SNOWPACK.

THE POTENTIAL IMPACTS FROM THE SNOWMELT AND RAINFALL RUNOFF
INCLUDE PONDING OF WATER WHERE STORM DRAINS OR DITCHES ARE CLOGGED
WITH SNOW AND ICE, PONDING OF WATER IN LOW LYING AREAS WITH POOR
DRAINAGE OR FROZEN GROUND, POSSIBLE ICE JAMS ON SMALL CREEKS AND
RIVERS THAT HAVE FROZEN OVER.

WHILE NO MAJOR RIVER FLOODING IS FORECAST AT THIS TIME, THIS IS AN
EVOLVING SITUATION AND SHOULD BE MONITORED REGULARLY FOR UPDATES.


$$




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Page last modified: May 16, 2007
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