[willamette-fcst] Forecast - Tuesday, July 10th, 2007
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Tue Jul 10 09:02:30 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.
Tuesday, July 10th, 2007 at 9:00am.
Agricultural burning is not recommended.
Preparatory burning is not allowed.
Propane flaming is not allowed.
Stack burning is not allowed.
A strong upper-level ridge extends from the four-courner\'s
region of the US to the Southern British Columbia Coast this
morning with very warm air aloft over the Pacific Northwest.
A surface thermal trough has developed west of the Cascades
and extends from near Medford to off the Northern Oregon
Coast. With a full day of July sunshine and offshore
low-level flow, afternoon temperatures will likely reach or
exceed the 100 degree mark in the Willamette Valley and the
90 degree mark along the Northern and Central Oregon Coast.
The Southern Coast has low clouds and fog associated with
onshore surface flow.
With northeasterly transport winds expected today, there may
be a brief burning opportnunity, for Western Willamette
Valley Growers late this morning, before Fire Marshal
conditions are met. Please contact your permit agent, if
want to take advantage of this potential burning
N 6-10 this morning, NNE 10-15 this afternoon.
NE 12-14 this morning, NE 15-20 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4000 feet. Ventilation index 60.
Salem\'s high temperature today will be near 101.
Relative humidity drops to 50% by 10am.
Minimum relative humidity will be near 21%.
Salem sunset tonight: 8:59pm; sunrise tomorrow: 5:36am.
The upper-level ridge will remain over Oregon on Wednesday,
before beginning to to shift eastward Wednesday night. The
associated surface thermal trough will build northward into
Western Washington, on Wednesday, with an onshore low-level
flow progressing northward along the Oregon Coast during the
day. Some marine air may begin to filter into the Southern
Willamette Valley late Wednesday, but not before tempertures
reach or exceed the 100 degree mark for the second straight
The upper-level ridge will shift to over Idaho on Thursday,
with the surface thermal trough moving east of the Cascades
in the afternoon. The influx of marine air will be very
weak, due to southerly flow aloft, and there is also a
chance of thunderstorm development, so this does not appear
to be a solid burning opportunity. We will monitor it.
A stronger southerly to southwesterly flow on Friday brings
more marine air into the western valleys but also an
increased threat of thunderstorms. A dry southwesterly flow,
with onshore surface flow across the state, will develop over the weekend.
Tomorrow (11 Jul): Sunny and Hot. 65/101
Thu (12 Jul): Mostly Sunny. Chance of a Thunderstorm Late. 65/93
Fri (13 Jul): Chance of Showers and Thunderstorms. 60/85
Sat (14 Jul): Morning Clouds...Afternoon Sun. 57/81
Sun (15 Jul): Morning Clouds...Afternoon Sun. 54/85
Mon (16 Jul): Morning Clouds...Afternoon Sun. 54/84
Tue (17 Jul): Mostly Cloudy. Chance of Showers. 56/73
weather at oda.state.or.us
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