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8-14 DAY OUTLOOK FOR JAN 10 - 16 2008: THE ATMOSPHERIC CIRCULATION FOR THE WEEK 2 FORECAST PERIOD IS EXPECTED TO UNDERGO RAPID CHANGES COMPARED TO THE 6-10 DAY FORECAST PATTERN. AS A RESULT, SIGNIFICANT DIFFERENCES ARE APPARENT BETWEEN MODEL SOLUTIONS. THE CANADIAN ENSEMBLE MEAN HOLDS ON TO A PATTERN WHICH IS SIMILAR TO THAT PREDICTED FOR DAYS 6-10, BUT THE OTHER MODEL SOLUTIONS DIFFER IN SEVERAL WAYS. FOR EXAMPLE, THERE IS A NOTICEABLE SPLIT IN THE BROAD WEST COAST TROUGH, WITH A CONCENTRATION OF BELOW NORMAL 500-HPA HEIGHTS OVER WESTERN ALASKA AND THE BERING SEA, AND ANOTHER CONCENTRATION OF BELOW NORMAL HEIGHTS OVER THE SOUTHWESTERN CONUS. THERE IS ALSO A MODERATE RIDGE FORECAST OVER THE EASTERN GULF OF ALASKA AND INTO WESTERN CANADA. THERE IS SOME INDECISION ON THE PART OF MOST MODELS AS TO WHERE TO PLACE THE UNUSUALLY STRONG RIDGE OVER THE SOUTHERN MARITIMES REGION IN THE PRECEDING 6-10 DAY PERIOD. IF THE RIDGE REMAINS IN THIS SAME LOCATION, THE EASTERN CONUS WOULD STAY RELATIVELY WARM, BUT IF, AS SOME MODEL RUNS SHOW, THIS RIDGE RELOCATES TO NORTHERN HUDSON BAY, VERY COLD CONTINENTAL AIR MASSES WOULD BE GENERATED. SOON THEREAFTER, ARCTIC AIR MAY STREAM SOUTHWARD ACROSS THE BORDER INTO THE CENTRAL (AND POSSIBLY EASTERN) CONUS. HOPEFULLY, TOMORROWS MODEL RUNS WILL ALLOW US TO BETTER ASSESS THE LIKELIHOOD OF THIS POSSIBILITY.
Definitely something to keep an eye on. If it's still there at T minus 7 days I'll start to get excited.