[willamette-fcst] Forecast - Tuesday, June 9th, 2009
Willamette Valley Ag/Burning Forecast
willamette-fcst at listsmart.osl.state.or.us
Tue Jun 9 09:08:24 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.
Tuesday, June 9th, 2009 at 9:00am.
Agricultural burning is allowed. Suggested burn times are from 1:00pm until 7:00pm.
Straw stack burning is allowed from 1:00pm until 7:00pm.
The weather pattern is transitioning from a cool and stable
northwesterly flow aloft to a slightly warmer and more
unstable southwesterly flow aloft this morning. A weak
upper-level trough was approaching the coastline, with
satellite and surface reports showing middle and high clouds
spreading across most of Oregon. The early morning sounding
over Salem showed the upper-level winds had become
southwesterly with the temperature profile becoming slightly
more unstable than on Monday.
The mid-morning ODA surface analysis showed a trough
extending from southwestern Oregon to north-central and
northwestern Oregon. Weak onshore flow brought marine
clouds into the coastline and the central and southern
Willamette Valley overnight, but the extreme north valley
was mostly sunny at mid-morning. Skies were also starting
to clear along the north coast. Mainly just middle and high
clouds extended east of the Cascades.
Mid-morning temperatures were mostly in the 50s across
western Oregon with 50s and low 60s east of the Cascades.
With the approaching upper-level trough continuing to back
the upper-level winds today, from southwesterly to more
southeasterly, daytime heating will likely help to make the
atmosphere unstable enough for scattered shower and
thundershower development...mainly over the Cascades and
central Oregon. It is possible that some showers and/or
t-storms could also develop or move over the western
valleys. Temperatures will warm into the low to mid 70s this
afternoon across the Willamette Valley with continued weak
S 3-6 this morning, SW 5-10 this afternoon.
Var 3 this morning, WSW 8 this afternoon.
Atmospheric Ventilation Conditions:
Maximum mixing height today will be near 4500 feet. Ventilation index 36.
Salem\'s high temperature today will be near 75.
Minimum relative humidity will be near 45%.
Salem sunset tonight: 8:57pm; sunrise tomorrow: 5:26am.
Another weak upper-level trough will continue the threat of
afternoon showers or t-storms Wednesday...mainly from the
Cascades eastward. A more westerly flow aloft may shift the
instability east of the Willamette Valley Thursday.
However, the flow aloft is forecast to become southerly
again by Friday, with an increasing chance of mainly
afternoon and evening showers and t-storms across the entire
state. Temperatures will likely stay near-normal through the week.
Tomorrow (10 Jun): Mostly Cloudy. Slight Chance of PM Showers or T-Storms. 53/71
Thu (11 Jun): Morning Clouds. Afternoon Clearing. 51/74
Fri (12 Jun): Mostly Cloudy. Chance of PM Showers or T-Storms...Mainly South. 54/73
Sat (13 Jun): Mostly Cloudy. Chance of Showers. Slight Chance T-Storm. 52/72
Sun (14 Jun): Mostly Cloudy. Chance of Showers. 51/72
Mon (15 Jun): Mostly Cloudy. Slight Chance of Showers. 51/72
Tue (16 Jun): Morning Clouds. Becoming Partly Sunny. 50/74
weather at oda.state.or.us
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