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<br />I <br />,I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />22 <br /> <br />surface ,,,inds backed quickly, the precipitation began iUU11ediately over the <br /> <br />upwind valley, the pressure began to rise and the surface temperature began <br /> <br />to fall rapidly. Over Wolf Creek Pass neutral to quite weak convective in- <br /> <br />stability developed ahead of the front. The thermodynamic instability in- <br /> <br />creased behind the front. There were two high rates of precipitation. The <br /> <br />first one was associated with the neutral to weak embedded convective in- <br /> <br />stability ahead of the front and the other was directly associated ,,,ith the <br /> <br />frontal passage. Because of the strong horizontal pressure gradient, there <br /> <br />,,,as no blocking flow but rather the air moved up and over the San Juans at <br /> <br />all levels. <br />