Primitive Equation Model Progress Report. December 1970 Results
FLEET NUMERICAL WEATHER CENTRAL MONTEREY CA
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Figures 5 and 6 contain the mean monthly sea-level pressure and 500-MB height distributions, respectively, for the month of December 1970. In Figure 5, note the principal cyclone track in the Pacific, extending from Japan across Kamchatka 996 mbs to the Gulf of Alaska 998 mbs. Centers in the Kamchatka area tended to be about six millibars deeper in December than in November. Gulf of Alaska lows were about nine millibars deeper in December. On the Atlantic side, one center 1003 mbs was located just south of Greenland, with another center 999 mbs in the Barents Sea. The Atlantic cyclone tracks were slightly different from those observed in November. In November, there was an intense low 999 mbs near Scotland, but it contained troughs which extended both westward to Hudson Bay and northeastward to the Barents Sea. The Asian high was stronger in December 1046 mbs than in November 1038 mbs. Canadian highs tended to be about three millibars higher in December, also. In Figure 6, the 500-MB mean troughs were located over Japan, along the U. S. West Coast, just off the U. S. East Coast 60 West, along a line from eastern Europe to the Moroccan Coast, and near 35 East. The northeast Atlantic contained fairly strong ridging because of persistent blocking activity. In November, by comparison, the 500-MB troughs were near 15 West, 30 East, over the Sea of Japan, near 145 West oriented NE-SW, and near 87 West.
- Numerical Mathematics