Aids in forecasting minimum temperature in the Wenatchee frost district
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Aids in forecasting minimum temperature in the Wenatchee frost district

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    "As in other fruit-frost districts, the Hygrometric Formula (Ellison,1928) has been used in Wenatchee as an aid to forecasting minimum temperatures during the spring. However, this formula was developed for the Wenatchee key station and there is a wide variation in minimum temperatures across the district, averaging about 12°F between the warmest and coldest key stations during April and May. More importantly, due to the elevation differences and rugged terrain, there are no consistent relationships between frost key stations. While National Meteorological Center (NMC) guidance in the form of MOS minimum temperature forecasts is available for Yakima, experience has shown that it is not reliable enough for use as an aid in the fruit-frost forecasting in north-central Washington. Because of these factors, a semiobjective may-typing system has been used which is usually very helpful in determining minimum temperature distribution across the district and somewhat useful in obtaining absolute values. To complement this scheme, an objective aid was sought which would estimate the coldest minimum temperature to be expected among the key stations in the district on a given night"--Introduction.
  • Content Notes:
    Robert S. Robinson.

    Includes bibliographical references (page 3).

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