[willamette-fcst] Forecast - Tuesday, May 20th, 2008
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Tue May 20 05:35:57 PDT 2008
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, May 19th, 2008 at 4:45 pm.
Burn Advisory For Tuesday, May 20th, 2008:
Agricultural burning is allowed. Suggested burn times are from 9:00am until 6:30pm.
Straw stack burning is allowed from 9:00am until 6:30pm.
The cooling trend that began Sunday across Oregon continued
today, as the strong upper-level high pressure ridge
flattened and pushed east of the region. High clouds spread
over much of the state by midday and were thickening up
across Western Oregon this afternoon. With very warm air
aloft, the high clouds did not keep temperatures from
climbing well above normal again this afternoon across the
interior regions of the state. Mid-afternoon temperatures
in the Willamette Valley were in the low to mid 80s.
Temperatures east of the Cascades were in the mid to upper
80s. It was much cooler along the coast, where onshore
winds kept temperatures in the mid 60s.
The ODA surface analysis showed a very weak trough extending
from Central Washington through SW Oregon with weak onshore
flow from the coastal strip to the coast range and very weak
winds in the western valleys. The onshore flow will
increase later this evening, bringing cooler ocean air into
the western valleys, in response to an approaching cold
front about 200 miles offshore. Clouds will increase
tonight, making for a mild overnight period with low
temperatures in the mid 50s.
A fairly strong cold front is forecast to move onshore early
Tuesday morning and rapidly sweep across the state during
the day. Rain is likely for most of Western Oregon with
numerous showers making it east of the Cascades. The
cool-down will be significant with high temperatures
dropping about 20 degrees from today across the state.
Temperatures west of the Cascades will fall to below normal
and the snow level should drop to about 5000 feet. Strong
onshore flow will make for locally windy conditions east of
SW 10 Tuesday morning, WSW 10-15 Tuesday afternoon.
WSW 15 Tuesday morning, W 18 Tuesday afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height Tuesday will be near 5000 feet. Ventilation index 90.
Salem\'s high temperature Tuesday will be near 62.
Minimum relative humidity will be near 58%.
Salem sunset tonight: 8:40pm; sunrise Tuesday: 5:37am.
A cold upper-level trough will move over the Pacific
Northwest Tuesday night and Wednesday for continued cool
temperatures and the threat of showers. High pressure will
slowly push closer to the coastline Thursday and Friday with
the flow aloft turning more northerly and drying out some.
the long-range models are indicating the possibility of a
weak disturbance dropping into the region, via the northerly
flow aloft, for a renewed slight chance of showers on
Friday. A cool but relatively dry upper-level trough will
likely pitch a tent and set up camp over the region this
holiday weekend with the next significant chance of rain
moving onshore Tuesday.
Tue (20 May): Rain AM...Showers PM. Much Cooler. Snow Level Dropping to 5000 Feet. 54/62
Wed (21 May): Mostly Cloudy and Cool. Chance of Showers. Snow Level 5000 Feet. 46/60
Thu (22 May): Partly Sunny. A Little Warmer. 43/66
Fri (23 May): Partly Cloudy. Slight Chance of a Shower. 43/65
Sat (24 May): Partly Cloudy. A Little Warmer. 41/70
Sun (25 May): Partly Cloudy. 42/70
Mon (26 May): Mostly Sunny. 44/74
Tue (27 May): Chance of Showers. 47/69
weather at oda.state.or.us
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