Laserfiche WebLink
• air layers close to the ground undergo cooling with associated lw <br />wind speeds; neural conditions occur with cloudy skies and/or high <br />wind speeds; transition conditions occur in the short period of time <br />following the breakup of stable conditions sad prior to the onset of <br />unstable or neutral conditions. <br />Stable Layers, at ground level, occurred approximately 60 <br />percent of the time in Craig. Such layers are typically as deep as <br />1,100 feet and can persist for several days during winter and <br />spring. Onder stable conditions, surface winds are light and <br />variable. Local influences control the surface wind about 40 <br />percent of the time. <br />• Ordinarily, local influences are caused by the valleys of <br />tributaries to the Yampa Biver, although the drainage air that floes <br />dow these smaller valleys are typically only 100 to 200 feet deep. <br />The existence of stable Layers is most common from 7 p.m, to 11 <br />a.m., followed by upslope, ar westerly winds through about 6 p.m. <br />The gradient westerly winds have higher velocities than the drainage <br />winds and are associated with neutral or unstable conditions. In <br />the transition period between stable and neutral or unstable <br />conditions, surface winds tend to be light and variable. <br />Wind data from the Federal Aviation Administration at the <br />• Hayden Airport (the closest reporting station collecting wind data) <br />shoe that winds with velocities of 3 to 15 miles per hour blow from <br />2.04-62 <br />