The Weather Alternative long-range forecast for April 12-14, 2007 (posted March 20, 2007) called for a southerly air flow over the West Coast States and precipitation if enough moisture were available.
The following report is from the National Weather Service. (Bold is mine)
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA451 AM PDT SAT APR 14 2007
PRECIPITATION COVERAGE SHOULD BE GOOD TODAY...GIVEN THE GOOD SOUTHERLY FETCH OF MOISTURE INTO THE INLAND NORTHWEST.
THE SOUTHERLY WIND TRAJECTORIES IN THE LOW/MID LEVELS ALONG THE FRONT WILL NEGATE THE RAIN SHADOW OVER THE EAST SLOPES THROUGH THE COLUMBIA BASIN...SO MANY AREAS TODAY SHOULD RECEIVE A TENTH TO A QUARTER INCH OF RAIN BY THIS EVENING.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
249 AM PDT SAT APR 14 2007
A NEARLY PURE SOUTHERLY FLOW WILL KEEP TYPICAL SHADOWING EFFECTS FROMCOMING INTO PLAY.
April 14, 2007 - The Weather Channel
West
A new storm will move across the West Today through Monday, bringing showers and mountain snow to the Pacific Northwest, Great Basin and Rockies.
Click here for April Forecasts
Click here for Hurricane Season 2007
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