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Good morning, this is a daily CWSU Salt Lake City Weather Briefing from 9am November 30,
2012, and is for ATC Planning Purposes Only. Across the country today, a frontal boundary
extends west from New Jersey to Iowa before turning northward through eastern Montana
with little weather associated with the front. The much more significant weather system exists
along the California Coast and extending northeastward into the mountains of Central Idaho. Very
heavy rainfall is being observed across northern California and southwest Oregon and this activity
is expected to continue today and into the weekend. Another storm system will bring significant
rainfall to those areas even into early next week. In the ZLC airspace, heavy snowfall
is expected across the central Idaho mountains where totals may reach 40-50 inches by the
end of the weekend at elevations above about 6000 feet. Snowfall is also expected along
the spine of the Rockies from near Kalispell southward to the Wasatch and Uinta Ranges
in Utah. Here we have a satellite imagery with radar
data overlayed, indicating widespread cloud cover across the western two-thirds of the
ZLC airspace. Colors also represent where the precipitation is falling as snow across
central Idaho and portions of western Montana, versus lower elevations where it continues
to be rain. Airmets for Turbulence are in effect from
the surface up through flight level 41,000 feet for most of the airspace through 2pm
today. Airmets for icing are also in effect for much
of the airspace from freezing level up through flight level 23,000 feet.
Sigmet Victor is in effect just west of the airspace over central California for extreme
icing from 9000 ft to flight level 23,000 feet.
This slide shows areas of Mountain Obscuration in pink, and areas where IFR conditions are
expected in purple. No severe thunderstorm activity is expected
across the country today, but there is potential for some thunderstorm activity along the Pacific
Coast with the strong storm system moving onshore.
Flight level 36,000 foot winds by mid-afternoon will be in excess of 100 knots across Idaho,
and will generally be from the west across the entire airspace today.
Vertical wind profile for SLC today indicates winds will remain from the south at the surface
with a veering to a more southwest direction at mid levels and eventually to that westerly
direction aloft. And a quick look at the SLC TAF for today,
indicating increasing chances for showers in the vicinity after 16Z, and mention of
rain showers prevailing after 01Z this evening. This briefing was issued at 9 am this morning,
30 November 2012. Please check with the CWSU ZLC for the latest updated data as conditions
change, and as a reminder this briefing is for ATC planning purposes only.