[willamette-fcst] Forecast - Monday, July 16th, 2007
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Mon Jul 16 08:53:28 PDT 2007
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, July 16th, 2007 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 12:00pm until 6:00pm.
Preparatory burning is allowed from 12:00pm until 2:00pm with a 100 acre limit.
Propane flaming is allowed from 12:00pm until 6:00pm.
Straw stack burning is allowed from 12:00pm until 6:00pm.
The upper-level ridge of high pressure, that was over the
Pacific Northwest last week, has moved eastward to over the
Rockies. An upper-level low pressure area is over the
Eastern Pacific Ocean this morning, with a southwesterly
flow aloft over Washington and Oregon. Middle and high
clouds cover most of Western Washington and NW Oregon this
morning. Onshore flow has also spread some marine
low-clouds into the Willamette Valley. The low clouds
should break up this afternoon, but the middle and high
clouds will be more persistent.
With a high mixing layer and onshore flow today, there is
some potential for burning this afternoon. However, as the
approaching upper-level low pressure area draws nearer to
the coastline, the transport winds may become more southerly,
which is not conducing to burning. We will start pibol readings,
from Salem, at noon to monitor the transport winds.
W 6 this morning, WNW 8 this afternoon.
NW 7 this morning, SW 9 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 5500 feet. Ventilation index 50.
Salem\'s high temperature today will be near 82.
Relative humidity drops to 50% by 3pm.
Minimum relative humidity will be near 37%.
Salem sunset tonight: 8:55pm; sunrise tomorrow: 5:42am.
A fairly strong and moist upper-level low pressure area will
approach the coastline Tuesday and Wednesday, with an
increasing chance of showers and southerly winds aloft over
Western Oregon. This system is forecast to move onshore
late Wednesday and Thursday, with cool and showery weather
west of the Cascades and a good chance for thundershowers in
Central and Eastern Oregon.
A drier southwesterly flow aloft takes over, starting
Friday, as the Pacific Northwest, once again, becomes
sandwiched between high pressure over the Rockies and low
pressure in the Eastern Pacific. The long-range computer
models go different directions starting this weekend, so
confidence in the forecast beyond Sunday is low.
Tomorrow (17 Jul): Mostly Cloudy. Increasing Chance of Showers. 59/77
Wed (18 Jul): Showers Likely. 58/77
Thu (19 Jul): Showers Likely. 56/73
Fri (20 Jul): Morning Clouds...Partly Cloudy Afternoon. 55/83
Sat (21 Jul): Partly Cloudy and Warm. 56/86
Sun (22 Jul): Mostly Sunny and Warm. 56/87
Mon (23 Jul): Increasing Clouds. 56/85
weather at oda.state.or.us
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