[willamette-fcst] Forecast - Thursday, June 4th, 2009
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Thu Jun 4 09:19:24 PDT 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.
...Next Update Scheduled for Friday, June 5th, at 9:00am...
Issued:
Thursday, June 4th, 2009 at 9:00am.
Burn Advisory:
Agricultural burning is allowed. Suggested burn times are from 11:00am until 7:00pm.
Straw stack burning is allowed from 11:00am until 7:00pm.
Weather Discussion:
Daytime heating combined with a continued moist and unstable
air mass to produce afternoon and evening shower and
thundershower activity over much of Oregon Wednesday.
Thundershowers extended as far north as Salem, west of the
Cascades, and all the way to the Washington border in
northeastern Oregon. The showers were decreasing this morning
due to cooler surface temperatures, but they were not gone completely.
Satellite imagery showed clouds circulating over most of
Oregon, around a broad low-pressure area centered about 100
miles off the central California coast. Temperatures were
mild, again, overnight, with minimums generally in the 50s
and low 60s on both sides of the Cascades. Some areas of
light rain were still falling at mid-morning...from northeastern
Oregon, across central, to southwestern Oregon.
The morning sounding over Salem continued to show very
unstable conditions, so daytime heating will enhance the
showers across all of Oregon today. Thunderstorms will
likely extend northward, to the Washington border, later
today. Some of the storms could produce locally heavy
rainfall and hail. Slight cooling aloft and considerable
cloud-cover will hold Willamette Valley highs temperatures
near 80 degrees today, after climbing to near 90 in the
north valley Wednesday.
The surface thermal trough, over western Oregon this
morning, is forecast to begin shifting east this afternoon,
in response to the upper-level trough moving onshore into
california. Transport winds are forecast to turn
southwesterly this afternoon, which should improve
ventilation conditions over the Willamette Valley. However,
lightning may develop this afternoon, so seek shelter, if
you are caught outdoors. Showers and thundershowers may
continue through much of the night across western Oregon,
with a change to more stable conditions beginning Friday.
Surface Winds:
SSE 3-7 this morning, SW 5-10 this afternoon.
Transport Winds:
SSE 5 this morning, SW 10 Gusty near showers and t-Storms this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 3200 feet. Ventilation index 32.
High Temperature:
Salem\'s high temperature today will be near 80.
Humidities:
Minimum relative humidity will be near 47%.
Sunrise/Sunset:
Salem sunset tonight: 8:54pm; sunrise tomorrow: 5:27am.
Extended Outlook:
The upper-level low-pressure center will move eastward,
across central California, on Friday. The flow aloft over
Oregon will turn northeasterly Friday, with the main area of
mid and upper-level moisture shifting east of the Cascades
by Friday afternoon. Considerable cloud-cover, possible
showers, and increasing onshore flow will significantly cool
temperatures west of the Cascades.
The flow aloft will turn from northeasterly to northwesterly
Saturday with onshore flow at the surface bringing marine
low clouds into the western valleys and stabilizing the air
mass. The marine layer may become enhanced enough for
drizzle or light showers across northwestern
Oregon...especially over the north coast range and along the
coastal strip.
A transitory weak upper-level ridge is forecast to keep
things dry Sunday and Monday, with a series of weak
upper-level troughs are possibly bringing some morning
drizzle or light showers to northwest Oregon around the
middle of next week. Temperatures may climb slightly above
normal Sunday and Monday, before dropping back below normal
around the middle of next week.
Tomorrow (05 Jun): Decreasing Showers...From NW to SE...Late. 57/71
Sat (06 Jun): Cloudy AM...Slight Chance of Drizzle. Partly Sunny PM. 52/70
Sun (07 Jun): Partly to Mostly Cloudy. 52/73
Mon (08 Jun): Partly Sunny. 52/75
Tue (09 Jun): Mostly Cloudy. Slight Chance of Drizzle or Light Showers. 50/69
Wed (10 Jun): Mostly Cloudy. Slight Chance of Light Showers. 50/68
Thu (11 Jun): Morning Clouds. Partly Sunny in the Afternoon. 50/71
ODA Meteorologist
weather at oda.state.or.us
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