Tuesday, June 21, 2011

7 to 10 Day Weather for the Washington Cascades

The general forecast is for below normal temperatures as we will continue the pattern of an active storm track over the Pacific Northwest. Basically troughs of low pressure and the associated surface lows will drop down from the north to bring cooler conditions at times with some precipitation.

The map below depicts the pattern that we will have over the 7 to 10 day period. The map below is the mean position of the 500 mb map which at about 18,000 to 19,000 foot level. This map is for the period June 28 to July 4 and indicates a trough of low pressure off the coast of Washington. The bottom line with this pattern is below normal temperatures so the Northwest will continue the same pattern that has been in place over the last several months, cooler than normal. However with this pattern there will be some brief periods that will be sunny conditions and average temperatures.
Finally on the map below the green contour lines are the heights which the pressure is at 500 mb. So the line of 5700 is in meters or is 18,810 feet.
When does summer usually start, July 5. We will see if that happens again this year.

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