[willamette-fcst] Forecast - Monday, July 23rd, 2007
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Mon Jul 23 09:01:23 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 23rd, 2007 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 1:00pm until 7:00pm.
Preparatory burning is allowed from 1:00pm until 2:00pm with a 100 acre limit.
Propane flaming is not allowed.
Dry straw stack burning is allowed from 1:00pm until 7:00pm.
South-southwesterly flow over the weekend stalled an active
frontal system just offshore. The Northern Oregon Coastal
strip received over an inch of rain. Meanwhile, the
Willamette Valley saw only very light amounts, with a trace
to a few hundredths of an inch on Saturday. Sunday was
generally dry. The damp weather and high humidity levels,
over the weekend, made for only marginal drying conditions,
after the widespread rainfall last Wednesday across the
The upper-level trough, responsible for the moist conditions
the past several days, is weakening and will begin lifting
into Southern British Columbia today. The associated
surface front is also weakening and will finally push inland
this afternoon and evening. That system will provide some
lift to the very moist air mass west of the Cascades, which
could result in some areas of light rain this afternoon.
Transport winds, which have been south-southwesterly are
likely to shift to a more favorable west-northwesterly
direction, for burning, this afternoon and mixing heights
should reach about 4500 feet. Surface gradients, which are
weakly onshore this morning, may also become more favorable
for open burning this afternoon. However, changes in
transport winds may be difficult to assess, due to low cloud
cover, and the relative humidity may stay too high for open
burning. Please contact your permit agent, if you think you
have a dry field that is ready to burn.
Preparatory burning is only being allowed from 1pm until 2pm
due to high humidity levels and the potential for open
burning this afternoon. That burning window may be
extended, if conditions favorable for open burning are not
likely to develop.
W 4 this morning, NW 7-11 this afternoon.
SSW 7 this morning, WNW 13 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4500 feet. Ventilation index 59.
Salem\'s high temperature today will be near 79.
Minimum relative humidity will be near 50%.
Salem sunset tonight: 8:49pm; sunrise tomorrow: 5:49am.
A more typical summer weather pattern is shown on today\'s
medium and long-range computer models. The pattern looks
dry beginning Tuesday through this weekend. There continues
to be weak southwesterly flow aloft, which would continue
onshore surface flow west of the Cascades and prevent
temperatures from climbing much above seasonal normals.
Tomorrow (24 Jul): Morning Clouds...Afternoon Sunshine. 58/83
Wed (25 Jul): Mostly Sunny and Warm. 54/88
Thu (26 Jul): Mostly Sunny and Warm. 58/88
Fri (27 Jul): Mostly Sunny and Warm. 58/88
Sat (28 Jul): Mostly Sunny. A touch cooler. 58/85
Sun (29 Jul): Partly Cloudy. 56/80
Mon (30 Jul): Partly Cloudy. 55/80
weather at oda.state.or.us
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