[willamette-fcst] Forecast - Thursday, October 1st, 2009

[Willamette Valley Ag/Burning Forecast]

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: 
     Thursday, October 1st, 2009 at 9:00am.

Burn Advisory:
     Agricultural burning is allowed.  Suggested burn times are from now until 5:00pm.
     Propane flaming is allowed from 12:00pm until 5:00pm.
     Straw stack burning is allowed from 12:00pm until 5:00pm.

Weather Discussion:
     Satellite imagery showed clouds, from a weak warm front,
     spreading across western Washington and most of western
     Oregon.  Light rain fell at times this morning across
     western Washington and along the northern Oregon coast. 
     Some sunbreaks were visible in the Willamette Valley,
     especially from Salem south.  Skies were mostly clear on the
     south coast and over southwestern Oregon.

     Clouds will increase, from north to south, across western
     Oregon today, as a weak cold front slowly drops
     southeastward into the region.  There is also an increasing
     chance of light rain...mainly from Salem north.  High
     temperatures will be a few degrees warmer than on Wednesday
     but still well below normal.

Surface Winds:
     SSE 5-10 this morning, SSW 5-10 this afternoon.
Transport Winds:
     S 10 this morning, SW 10 this afternoon.
Atmospheric Ventilation Conditions:
     Maximum mixing height today will be near 3500 feet.  Ventilation index 35.
High Temperature:
     Salem\'s high temperature today will be near 66.
Humidities:
     Minimum relative humidity will be near 54%.
Sunrise/Sunset:
     Salem sunset tonight: 6:52pm; sunrise tomorrow: 7:12am.

Extended Outlook:
     Another quite strong and cool upper-level trough is forecast
     to drop into the Pacific Northwest this weekend.  Showers
     will likely increase across Washington and northern Oregon
     Friday...spreading south across the remainder of Oregon,
     Friday night and Saturday. Snow levels will drop below the
     Cascade passes Saturday...to as low as 3000 feet.

     The upper-level trough is forecast shift east of the
     Cascades Sunday.  The threat of showers should end, across
     western Oregon, by Sunday evening, with a drier, but
     continued cool, north-northeasterly flow aloft developing
     Monday.  An upper-level ridge is forecast to slowly build
     into the coastline next week, with dry and progressively
     warmer early-autumn weather.

Tomorrow (02 Oct):  Mostly Cloudy.  Increasing Chance of Showers From North to South.  47/63

Sat (03 Oct):  Showers Likely.  Slight Chance of T-Storms.  Snow Level 3-4000 Feet.  43/59

Sun (04 Oct):  Mostly Cloudy and Cool. Decreasing Chance of Showers.  41/63

Mon (05 Oct):  Patchy AM Fog or Low Clouds...Mostly Sunny in the Afternoon.  39/67

Tue (06 Oct):  Patchy AM Fog....Sunny and Warmer.  42/73

Wed (07 Oct):  Patchy AM Fog...Sunny and Warm.  43/75

Thu (08 Oct):  Patchy AM Fog...Sunny and Warm.  44/78

ODA Meteorologist
weather at oda.state.or.us