We have returned from a long trip to Washington D.C., where we did see a bit of rain last Friday. Here in the Southwest it almost looks like "Play it again Sam" with another strong, 500 mb shortwave trough digging south off the California coast. Ahead of this system precipitable water has been slowly increasing during the past several days. The view looking north to the Catalinas (top) shows a heavy Cu field and the bottom two graphs (from NOAA in Boulder) show that April has been quite dry so far wrt precipitable water (PW). Note also that the TWC (Tucson) upper-air soundings have had a strong dry bias during the month relative to the GPS PW values - seven TWC soundings were dry relative to the GPS running mean by more than a standard deviation. This morning the two different measures were in agreement with around 2 cm of PW.
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