<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoNoSpacing, li.MsoNoSpacing, div.MsoNoSpacing
{mso-style-priority:1;
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><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>11:40 AM PDT TUE JUL 19, 2011<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>BURN ADVISORY:<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Recommended burn times for agricultural burning are from now to 7:00pm.<o:p></o:p></p><p class=MsoNoSpacing>Prep burning is allowed from now to 2:00pm with a 50 acre limit. <o:p></o:p></p><p class=MsoNoSpacing>Propane flaming is allowed from now to 5:00pm. <o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing>WEATHER DISCUSSION:<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Upper level trough is moving east of the region and will leave cool, NW’erly flow over the area through this afternoon and evening. Air mass will be mostly unstable. Onshore flow will remain fairly moderate today keeping clouds from breaking up too much and keeping temperatures a little cooler than yesterday.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Radar is showing this morning’s showers dissipating and moving east of the region. Would not likely see anymore shower activity this afternoon. Satellite picture shows extensive cloud cover over western Oregon with little noticeable breakup. Pressure gradients are onshore at 1.4 mb Newport to Salem and onshore at 2.2 mb from Salem to Redmond.<o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing>TODAY’S FORECAST:<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Mostly cloudy.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Salem's high temperature today will be near 71.<o:p></o:p></p><p class=MsoNoSpacing>Relative humidity drops to 50% by 4pm. Minimum relative humidity 49%.<o:p></o:p></p><p class=MsoNoSpacing>Surface winds: W to NW at 6-12 mph.<o:p></o:p></p><p class=MsoNoSpacing>Transport winds: W to NW at 10-15 mph.<o:p></o:p></p><p class=MsoNoSpacing>Maximum mixing height: 5000+ ft.<o:p></o:p></p><p class=MsoNoSpacing>Sunset tonight: 8:53 pm <o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing>THREE-HOURLY DATA: <o:p></o:p></p><p class=MsoNoSpacing> 2pm 5pm 8pm <o:p></o:p></p><p class=MsoNoSpacing> Temperature: 70 71 66 <o:p></o:p></p><p class=MsoNoSpacing> Relative Humidity: 54% 49% 57%<o:p></o:p></p><p class=MsoNoSpacing> Surface Wind Direction: 280 280 290<o:p></o:p></p><p class=MsoNoSpacing> Surface Wind Speed: 8 11 10 <o:p></o:p></p><p class=MsoNoSpacing> Transport Wind Direction: 280 280 280 <o:p></o:p></p><p class=MsoNoSpacing> Transport Wind Speed: 12 14 13<o:p></o:p></p><p class=MsoNoSpacing> Estimated Mixing Height: 5000+ 5000+ 3500<o:p></o:p></p><p class=MsoNoSpacing> Ventilation Index: 60 70 46 <o:p></o:p></p><p class=MsoNoSpacing> <o:p></o:p></p><p class=MsoNoSpacing>EXTENDED DISCUSSION:<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Upper level pattern remains somewhat trough-like on Wednesday with onshore flow weakening and turning a little more northerly. Next upper level low drops down from north of Vancouver Island on Thursday and strengthens the onshore flow again. Expect a chance of light showers or sprinkles but not like the past weekend. Trough moves off to the east Friday giving way to a weak ridge for Friday afternoon and Saturday. Temperatures warm and winds turn northerly again.<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, and <o:p></o:p></p><p class=MsoNoSpacing> winds less than about 15mph.<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 times <o:p></o:p></p><p class=MsoNoSpacing> the transport wind speed 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 of<o:p></o:p></p><p class=MsoNoSpacing>Agriculture and the Oregon Department of Forestry. For information contact ODA at 503-986-4701.<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNoSpacing>Nick Yonker<o:p></o:p></p><p class=MsoNoSpacing>ODF Meteorologist<o:p></o:p></p><p class=MsoNoSpacing><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>