Transcript weatherdiscussion1410.ppt

Weather Discussion
January 4
Year in Review
• SEATAC HAD THE WARMEST AVERAGE January
TEMPERATURE EVER WITH 47.0 DEGREES
BREAKING THE PREVIOUS RECORD IN 2006 OF
46.6 DEGREES. OLYMPIA HAD
THE SECOND WARMEST JANUARY EVER AT
43.7 DEGREES AND QUILLAYUTE NEAR
FORKS ALSO HAD THE SECOND WARMEST
JANUARY EVER AT 46.3 DEGREES.
Year in Review
• SPRING...COOL AND WET. AVERAGE
WESTERN WASHINGTON TEMPERATURES IN
MAY AND JUNE RANGED BETWEEN 1 AND
3 DEGREES BELOW NORMAL WHILE
PRECIPITATION WAS ONE TO 2.5 INCHES
ABOVE AVERAGE. SEATAC AIRPORT DID NOT
REACH 75 DEGREES OR GREATER
UNTIL JUNE 23RD...THE LATEST EVER.
Year in Review
• TWO HEAT SUMMER WAVES WITH HIGH
TEMPERATURES IN THE 90S...ONE IN JULY AND
THE OTHER IN AUGUST. SEATAC AIRPORT
AVERAGES ONLY THREE DAYS PER YEAR OF 90
DEGREES OR ABOVE - 2010 HAD
SIX DAYS IN THE 90S AND 21 DAYS OF 80 OR
BETTER WITH AN AVERAGE OF
25 DAYS PER YEAR.
• SEATAC AIRPORT HAD ITS THIRD WETTEST
SEPTEMBER EVER WITH 4.80 INCHES - JUST
OVER THREE INCHES ABOVE
NORMAL.
• In NOVEMBER SEATAC AIRPORT HIT 74
DEGREES ON THE 3RD AND THEN ON THE 24TH
PLUNGED TO 14 - A 60 DEGREE RANGE IN ONE
MONTH - THE GREATEST EVER ON RECORD
Last Five Days: Low Dewpoints and
Lots of Frost
Dewpoint
Recent Evolution of Equatorial Pacific SST
Departures (oC)
Time
Longitude
Niño Region SST Departures (oC)
Recent Evolution
The latest weekly SST
departures are:
Niño 4
-1.5ºC
Niño 3.4 -1.5ºC
Niño 3
-1.5ºC
Niño 1+2 -0.6ºC
SST Departures (oC) in the Tropical Pacific During
the Last 4 Weeks
During the last 4-weeks, SSTs were at least 1.0°C below average between 160°E and
the South American coast, with departures more than 2.0°C below average in some
areas.
Pacific Niño 3.4 SST Outlook
• Nearly all models indicate that La Niña (Niño-3.4 SST anomalies -0.5°C or less) will peak
during the Northern Hemisphere Winter 2010-11.
• La Niña is expected to last at least into the Northern Hemisphere spring 2011.
Figure provided by the
International Research
Institute (IRI) for Climate
and Society (updated 14
December 2010).
U. S. Seasonal Outlooks
January - March 2011
Temperature
Precipitation
The seasonal outlooks combine the effects of long-term trends,
soil moisture, and, when appropriate, the ENSO cycle.
U.S. Temperature and Precipitation Departures During the
Last 30 and 90 Days
Last 30 Days
30-day (ending 2 Jan 2011) % of
average precipitation
30-day (ending 1 Jan 2011) temperature
departures (degree C)
Last 90 Days
90-day (ending 2 Jan 2011) % of
average precipitation
90-day (ending 1 Jan 2011) temperature
departures (degree C)