[willamette-fcst] Forecast - Wednesday, October 7th, 2009

Willamette Valley Ag/Burning Forecast willamette-fcst at listsmart.osl.state.or.us
Wed Oct 7 09:04:09 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.

Issued: 
     Wednesday, October 7th, 2009 at 9:00am.

Burn Advisory:
     Agricultural burning is allowed.  Suggested burn times are from 1:00pm until 4:30pm.
     Propane flaming is allowed from 1:00pm until 5:00pm.
     Stack burning is not allowed.

Weather Discussion:
     A strong upper-level ridge of high pressure was still over
     the eastern Pacific Ocean this morning with a cool and dry
     northerly flow aloft over Washington and Oregon.  A cold
     weather system was sliding down the eastern flank of the
     ridge and bringing a early-season snowstorm to western Montana.
     That dropped the surface pressure enough across eastern
     Washington to induce onshore flow into northwestern Oregon.

     Mid-morning satellite imagery showed low clouds along the
     Washington Coast and locally into the interior of western
     Washington.  Low clouds extended southward along the northern
     and central Oregon Coast and had pushed inland into mainly
     the northern Willamette Valley.  Low clouds were beginning
     to also penetrate into the south valley, with mostly clear
     skies over southwestern, central and eastern Oregon.

     Low clouds made for warmer temperatures this morning in the
     north valley, with most minimums staying in the 40s. 
     McMinnville managed to dip to 38 degrees.  It was another
     chilly morning in the south valley, where mostly clear skies
     allowed temperatures to locally drop to near the freezing
     mark.  Eugene dipped down to at least 34 degrees, before
     some fog and low clouds began to form.

     The onshore flow is not very strong this morning, so low
     clouds and fog should give way to mostly sunny skies over
     the Willamette Valley this afternoon.  However, high
     temperatures should be a few degrees cooler today, after
     reaching near 70 degrees Tuesday afternoon.  Winds will be
     light this morning and become northerly this afternoon. 
     Mostly clear skies tonight should allow valley temperatures
     to drop back into the upper 30s and low 40s by Thursday morning.

Surface Winds:
     SE 0-7 this morning, N 5-12 this afternoon.
Transport Winds:
     NNE 10 this morning, N 10 this afternoon.
Atmospheric Ventilation Conditions:
     Maximum mixing height today will be near 3300 feet.  Ventilation index 33.
High Temperature:
     Salem\'s high temperature today will be near 66.
Humidities:
     Relative humidity drops to 50% by 2pm.
     Minimum relative humidity will be near 45%.
Sunrise/Sunset:
     Salem sunset tonight: 6:41pm; sunrise tomorrow: 7:19am.

Extended Outlook:
     Cold weather systems are forecast to continue to bring
     early-autumn snows to Montana through Saturday, while
     Washington and Oregon stay under the influence of a dry and
     cool northerly flow aloft.  There will be areas of morning
     low clouds and fog but plenty of afternoon sunshine.  Highs 
     will struggle to reach near-normal with continued chilly mornings.

     The upper-level ridge is forecast to build more directly
     over the west coast by late this weekend, with warmer air
     aloft and light offshore surface winds combining to possibly
     warm valley temperatures into the low 70s Sunday.  The ridge
     is forecast to break down and shift east early next week,
     with increasing westerly flow aloft opening the door for a
     series of Pacific storms to bring widespread rains onshore.

Tomorrow (08 Oct):  Areas of AM Fog or Low Clouds.  Sunny in the Afternoon.  40/68

Fri (09 Oct):  Morning Clouds.  Becoming Mostly Sunny.  42/65

Sat (10 Oct):  Mostly Sunny.  Offshore Flow Developing.  39/67

Sun (11 Oct):  Mostly Sunny.  38/71

Mon (12 Oct):  Mostly Cloudy.  Increasing Chance of Rain.  43/65

Tue (13 Oct):  Rain Likely.  South Winds.  47/62

Wed (14 Oct):  Rain Likely.  48/62

ODA Meteorologist
weather at oda.state.or.us



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