Active Pattern for the Center of the Nation

Critical fire weather conditions, severe thunderstorms capable of producing severe wind gusts, large hail, strong tornadoes and heavy rainfall remain on tap for the central U.S. this evening. Flash flooding is also possible for portions of the Plains and Mississippi Valley. Very large hail up to 3 inches in diameter will be possible this evening across western Kansas. Read More >

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Figure 7: ETA 12 Hour Forecast of 250-850 mb Qn vectors,
thickness and isotachs valid 1200 UTC May 12, 1997.

Figure 8: ETA 18 Hour Forecast of 250-850 mb Qn vectors,
thickness and isotachs valid 1800 UTC May 12, 1997.

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Active Pattern for the Center of the Nation

GEMPAK Q-vectors