March 2011 is going to end with a fast-moving series of 500 mb short waves crossing the central and northern portions of the western US, leaving southern Arizona well-removed from any weather of significance. However, once again (way out at 7 days) the ECMWF and GFS are quite different. This time however, the more usual situation is present with the ECMWF forecasting a much stronger 500 mb short wave approaching the Southwest. The operational member forecasts from the two models are shown above, with ECMWF at top.The forecasts are valid at 0000 UTC on Sunday April 3rd. The ECMWF is almost 200 m deeper near the LA Basin - so another bit of meteorological interest, but still at long ranges.
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