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The National Weather Service. Spokane , Washington. El Ni ñ o & La Ni ña SSTs. El Ni ñ o is warmer-than-normal SST La Ni ñ a is colder-than-normal SST. Patterns. El Ni ñ o Strong Pacific Jet Stream from West. La Ni ñ a Jet Stream from Northwest. Dec-Jan-Feb Temperature Probability. - PowerPoint PPT Presentation
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The National Weather The National Weather ServiceService
Spokane, Washington
El NiEl Niñño & La Nio & La Niña SSTsña SSTs
• El NiEl Niñño is o is warmer-warmer-than-normal than-normal SSTSST
• La NiLa Niñña is a is colder-than-colder-than-normal SSTnormal SST
PatternsPatterns•El NiEl Niññoo
– Strong Strong Pacific Jet Pacific Jet Stream Stream from from West.West.
•La NiLa Niññaa– Jet Stream Jet Stream
from from Northwest.Northwest.
Dec-Jan-Feb Temperature Probability
Dec-Jan-Feb Precipitation Probability
Seasonal Precipitation and La NiñaSeasonal Precipitation and La NiñaSeasonal Precipitation and La NiñaSeasonal Precipitation and La Niña
• Seasonal Precipitation Expected to be Seasonal Precipitation Expected to be AboveAbove NormalNormal– Normal Snowfall at Ephrata is 18.7”– Look for Snowfall Amounts of 19” to 24”
• La Niña Forecast to Continue through SpringLa Niña Forecast to Continue through Spring– Below Normal Sea Surface Temps Forecast
to slowly rise into June– Below Normal Temps and Above Normal
Precip to Continue
Percent of Normal Precip Since Percent of Normal Precip Since 10/1/0910/1/09
Grant County ranges from 70 to 130 percent of normal
Who Is The Who Is The National Weather Service?National Weather Service?
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Spokane NWS OfficeSpokane NWS Office
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IDZ027-230700-LEWIS AND SOUTHERN NEZ PERCE COUNTIES-246 PM PST FRI JAN 22 2010
...WINTER WEATHER ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 10 PM PST SATURDAY ABOVE 2000 FEET...
* SNOW ACCUMULATIONS: 3 TO 6 INCHES ARE POSSIBLE.
* ELEVATION: MAINLY ABOVE 2000 FEET...WITH MINOR ACCUMULATIONS BELOW 2000 FEET.
* TIMING: LIGHT SNOW WILL BEGIN THIS EVENING AND CONTINUE THROUGH SATURDAY. SNOW WILL TAPER OFF SATURDAY NIGHT.
* LOCATIONS INCLUDE: CRAIGMONT...NEZPERCE...WINCHESTER... SOLDIERS MEADOW ROAD
* WINDS: NORTHWEST AROUND 5 TO 15 MPH.
* IMPACTS: RECENT WARM TEMPERATURES WILL LIKELY ALLOW THE INITIAL SNOWFALL TO MELT ON AREA ROADWAYS...HOWEVER COLDER TEMPERATURES BY SATURDAY MORNING WILL LIKELY RESULT IN DIFFICULT DRIVING CONDITIONS THROUGH SATURDAY NIGHT. MOTORISTS SHOULD PLAN AHEAD TO AVOID ANY UNNECESSARY TRAVEL DURING THIS POTENTIAL WINTER STORM.
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