[willamette-fcst] Forecast - Tuesday, March 10th, 2009
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Tue Mar 10 08:09:08 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.
Tuesday, March 10th, 2009 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 12:00pm until 4:00pm.
Straw stack burning is allowed from 12:00pm until 4:00pm.
A cold northwesterly flow aloft helped a weakening Arctic
cold front slowly sag southward, across most of Washington,
overnight. An unseasonably cold air mass is on the north
side of that frontal boundary. All but extreme southwestern
Washington was well below freezing this morning with north
or northeasterly winds. To the south of the front, onshore
flow keep skies cloudy overnight across western Oregon with
southerly winds helping to hold temperatures in the mid 30s
across the Willamette Valley.
Satellite imagery showed mostly cloudy skies along and south
of the Arctic cold front, covering the southern third of
Washington and most of Oregon. Doppler radar was indicating
areas of very light precipitation near the frontal zone
across extreme southern Washington and northern Oregon. The
snow level is at the surface east of the Cascades and around
500 feet over northwest Oregon this morning, so a few
snowflakes are possible even at low elevations again this morning.
Expect winter driving conditions over the coast range and
Cascade passes today. ODOT reports showed icy areas over
the coast range and packed snow over the Cascade passes this
morning. The air mass aloft is very cold, with Cascades
pass temperatures only in the upper teens this morning. A
Winter Weather Advisory remains in effect until 10am for the
Cascades, where another inch or two of snow could fall this morning.
The Arctic frontal boundary is expected to continue to
weaken and slowly sag south to over northern Oregon this
afternoon. that should keep skies mostly cloudy today
across the Willamette Valley with a slight chance of
sprinkles or flurries. Light southerly winds will taper off
this afternoon and become northerly tonight, as colder and
drier air begins filtering into western Oregon. Afternoon
temperaturs will struggle into the mid 40s (about 10 degrees
below average). Partial clearing and the influx of colder
air will drop valley temperatures well down into the 20s
tonight with local record low temperatures possible.
S 5-10 this morning, S 3-8 this afternoon.
WSW 10 this morning, WSW 8 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 5000 feet. Ventilation index 50.
Salem\'s high temperature today will be near 44.
Minimum relative humidity will be near 58%.
Salem sunset tonight: 7:12pm; sunrise tomorrow: 7:31am.
After a frosty morning on Wednesday, with near-record low
temperatures, mostly sunny skies will help afternoon
temperatures moderate into the upper 40s. Surface winds will
turn offshore Wednesday and strongly offshore Thursday, as
an upper-level ridge builds into the coastline and brings a
dry northerly flow aloft. Afternoon temperatures will
continue to warm, under mostly sunny skies, Thursday and
Friday, but mornings will continue to be quite chilly.
The next weather system will bring rain back to the region
Friday night with showers continuing on Saturday. The air
aloft will be cold enough to support snow down to Cascade
pass levels Saturday. A flat upper-level ridge is forecast
to build over the region early next week. There may still
be some light rain over northwestern Oregon Sunday, but
Monday is looking dry and warmer. It may become spring-like
early next week, with increasing offshore flow yielding
afternoon temperatures in the low to mid 60s.
Tomorrow (11 Mar): Near Record-Cold Morning. Mostly Sunny in the Afternoon. 24/48
Thu (12 Mar): Another Cold Start. Mostly Sunny and Warmer in the Afternoon. 27/53
Fri (13 Mar): Mostly Sunny and Warmer. Increasing Clouds Late. 31/57
Sat (14 Mar): Rain Turning to Showers. Snow Level 3-4000 Feet. 35/50
Sun (15 Mar): Mostly Cloudy. Chance of light Rain North. Snow Level 5000 Feet. 38/53
Mon (16 Mar): A Brief Shot of Spring-like Conditions. Mostly Sunny. 39/63
Tue (17 Mar): Increasing Cloudy and Mild. 42/63
weather at oda.state.or.us
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