JUNE-AUGUST 2008
90-Day Forecast
720 PM EST Tue. June 3, 2008
Atmospheric patterns, 700 MB and 500 MB height anomalies, statistical
data, various models, observed cases from past summers and sea surface
temperatures in the tropical Pacific where used in this forecast.
The strength of negative sea surface temperatures along the Equator in
the east-central Pacific has decreased. The atmospheric circulation
across the tropical Pacific still indicate a cold episode, with
enhanced low-level easterlies and suppressed convection in the central
equatorial Pacific. The current episode will have little impact on the
forecast for the summer.

Cool waters odd the West coast will likely cause below normal
temperatures across the Northwest. The probability of above normal
temperatures in this region is 56 percent. Most 90-day tools are in
good agreement in depicting above normal temperatures the central and
southern Rockies into the central and southern Plains into the lower
Mississippi Valley. The probability of above normal temperatures
occurring across this area is 57 percent. The remainder of the nation
is expected to average near normal with no significant deviation from
normal climatology.
Below normal precipitation is expected across a large portion of the
West with the exception being the Northwest. The probability of below
normal precipitation in this area is 56 percent. Above normal
precipitation is forecast for northern New England. The probability of
below normal precipitation in this region is 57 percent. The remainder
of the nation is expected to be near normal with no significant
deviation from climatology.