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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNoSpacing>SILVERTON HILLS FIELD BURNING FORECAST<o:p></o:p></p><p class=MsoNoSpacing>OREGON DEPARTMENT OF FORESTRY WEATHER OFFICE<o:p></o:p></p><p class=MsoNoSpacing>8:50 AM PDT TUE SEP 23, 2014<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing><b>*** Today will be the final broadcast of the 2014 season. ***<o:p></o:p></b></p><p class=MsoNoSpacing><b>*** Morning forecasts will continue through this Friday. ***<o:p></o:p></b></p><p class=MsoNoSpacing><b>*** There will be no further noon updates this season. *** <o:p></o:p></b></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing><b>BURN ADVISORY:<o:p></o:p></b></p><p class=MsoNoSpacing><b><o:p> </o:p></b></p><p class=MsoNoSpacing>Recommended times for agricultural burning are from 11 a.m. until 5 p.m.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Prep burning is not allowed.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing><b>WEATHER DISCUSSION:<o:p></o:p></b></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Autumn officially began yesterday at 7:29 p.m., and the weather is changing accordingly… Cloudy skies cover virtually all of Oregon this morning, in advance of an impressive autumn storm that will slowly makes its way onshore later today through Wednesday. Spotty light rain today will increase tonight…possibly becoming heavy across much of western Oregon by Wednesday morning. Rain will taper off and turn showery later Wednesday, as the moist frontal system slowly pushes east of the Cascades. Rainfall totals could exceed an inch from tonight through Wednesday.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing><b>TODAY’S FORECAST:<o:p></o:p></b></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Cloudy. Sprinkles or very light rain at times. Increasing rain late.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Salem's high temperature today will be near 70°F (average is 75°F).<o:p></o:p></p><p class=MsoNoSpacing>Relative humidity: Dropping to 60% by 5 p.m.<o:p></o:p></p><p class=MsoNoSpacing>Surface winds: S 5-10 mph this morning; S 10-15 mph this afternoon.<o:p></o:p></p><p class=MsoNoSpacing>Transport winds: S 10-15 mph this morning; SSW 20-25 mph this afternoon.<o:p></o:p></p><p class=MsoNoSpacing>Mixing height: Rising to near 4000 feet by 5 p.m.<o:p></o:p></p><p class=MsoNoSpacing>Salem’s sunset tonight: 7:07 p.m.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>(Salem Airport data for Monday, September 22nd: High 70°F; Rainfall: Trace)<o:p></o:p></p><p class=MsoNoSpacing>(Maximum Ventilation Index expected today: 100)<o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing><b>EXTENDED DISCUSSION:<o:p></o:p></b></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>An upper-level trough will maintain cool and showery weather Thursday and Friday. A transitory upper-level ridge is expected to bring dry weather on Saturday, but light rain is possible again by late Sunday. The threat of light rain will continue through at least early next week, with temperatures remaining near to slightly below average.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>The National Weather Service’s digital forecast is available at:<o:p></o:p></p><p class=MsoNoSpacing><a href="http://forecast.weather.gov/MapClick.php?lat=44.90549606158295&lon=-122.8106689453125&site=pqr&unit=0&lg=en&FcstType=text">http://forecast.weather.gov/MapClick.php?lat=44.90549606158295&lon=-122.8106689453125&site=pqr&unit=0&lg=en&FcstType=text</a><o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Notes:<o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing> 1. Mixing height, as used here, is the lowest height at which the<o:p></o:p></p><p class=MsoNoSpacing> potential temperature exceeds the potential temperature at the<o:p></o:p></p><p class=MsoNoSpacing> surface. As a practical matter it is the approximate height to<o:p></o:p></p><p class=MsoNoSpacing> which a smoke plume will rise assuming good ignition, dry fuels,<o:p></o:p></p><p class=MsoNoSpacing> and winds less than about 15 mph.<o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing> 2. Transport winds are a layer average through the mixing height, <o:p></o:p></p><p class=MsoNoSpacing> weighted slightly toward the winds at the top of the layer.<o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing> 3. Ventilation Index is the height of the mixing layer (ft) times <o:p></o:p></p><p class=MsoNoSpacing> the transport wind speed (mph) divided by 1000.<o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing> 4. Surface wind direction is the general expected wind direction. <o:p></o:p></p><p class=MsoNoSpacing> At a specific point surface winds are highly dependent on local<o:p></o:p></p><p class=MsoNoSpacing> terrain conditions.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>This forecast is provided under an agreement between the Oregon Department<o:p></o:p></p><p class=MsoNoSpacing>of Agriculture (ODA) and the Oregon Department of Forestry (ODF). For<o:p></o:p></p><p class=MsoNoSpacing>information contact ODA at 503-986-4701.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing><b>To add/remove your email address from this list, please go to:<o:p></o:p></b></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing><a href="http://listsmart.osl.state.or.us/mailman/listinfo/willamette-fcst">http://listsmart.osl.state.or.us/mailman/listinfo/willamette-fcst</a><o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Pete Parsons<o:p></o:p></p><p class=MsoNoSpacing>ODF Meteorologist<o:p></o:p></p></div></body></html>