[willamette-fcst] Forecast - Monday, March 2nd, 2009
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Mon Mar 2 09:08:29 PST 2009
Daily Smoke Management Forecast
Oregon Department of Agriculture
Smoke Management Program
Weather Outlook and Field Burning Advisory for Willamette Valley Growers and Fire Districts.
Monday, March 2nd, 2009 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from now until 4:00pm.
Straw stack burning is allowed from now until 4:00pm.
A slow moving cold front brought about more than an inch of
rain to sections of the southern and central oregon caoast
overnight and from one-quarter to three-quarters of an inch
of rain to the Willamette Valley. The greatest rainfall
amounts were in Lane County. North Bend has picked up just
over two inches of rain in the past 24 hrs, with the
southern Willamette valley generally erceiving between
one-half and three-quarters of an inch. Some spots in the
extreme north valley, like the Portland Airport, pickes up
less than one-quarter of an inch.
The ODA surface analysis showed the weakening cold front
along the Cascades at mid-morning. Southerly flow aloft was
keeping freezing levels near 6000 feet, with pass
temperatures in the mid 30s. Timberline Lodge reported 3
inches of new snow overnight, so this front was not a big
snow-maker for the mountains. ODOT raod cameras showed
generally wet pavement over the passes. Pressure were
relaxing across western Oregon, with south-southeasterly
winds in the 5-15 mph rain from the coast across the
Satellite imagery showed considerable breaks in the clouds
across western Oregon, in the wake of the cold front. Some
sunbreaks will enhance daytime heating, with valley highs
likely climbing into the mid 50s (a little above normal).
With the air aloft slowly cooling today, the afternoon
heating should help to trigger some instability showers.
Ventilation conditions will be good today, with southerly
transport winds and high mixing heights.
SSE 5-15 this morning, SSE 5-15 this afternoon.
S 20 this morning, S 20 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 5000 feet. Ventilation index 100.
Salem\'s high temperature today will be near 54.
Minimum relative humidity will be near 64%.
Salem sunset tonight: 6:01pm; sunrise tomorrow: 6:46am.
Another organized system, in the southwesterly flow aloft,
is forecast to come onshore overnight, which will increase
the rainfall across western Oregon. Snow levels will slowly
drop to below the the cascades passes tonight, with 3-6
inches of new snow likely by Tuesday morning. As an
upper-level trough Showers will continue Tuesday and taper
off Wednesday, as an upper-level trough weakens and moves onshore.
a quite cold system is forecast to drop into the region from
southern British Columbia Thursday with more rain and very
low snow levels. This system will need to be watched
closely for the potential to produce sticking snow in the
coast range and wet snow down the Willamette Valley floor.
Showers will continue Friday with snow levels slowly lifting
in the afternoon. The showers may briefly taper off
Saturday, before another very cold system drops into the
Tomorrow (03 Mar): Rain Turning to Showers. Snow Level 3500 Feet. 41/53
Wed (04 Mar): Showers...Decreasing Late. 35/50
Thu (05 Mar): Rain and Colder. Snow Level Dropping to 1000 Feet or Less. 34/46
Fri (06 Mar): showers. Snow Level Starting Below 1000 Feet and Slowly Rising. 32/47
Sat (07 Mar): Partly Cloudy. Slight Chance of Showers. 31/50
Sun (08 Mar): Increasing Rain and Snow. Snow Level Possibly Dropping to 500 Feet. 34/46
Mon (09 Mar): Becoming Partly Sunny. 29/49
weather at oda.state.or.us
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