| Predicting inversion depths and temperature influences in the Helena Valley - :6517 | National Weather Service (NWS)
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Predicting inversion depths and temperature influences in the Helena Valley
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    "Surface inversions in the Helena Valley are common throughout the year with strongest and most frequent occurrence during summer and falI. The quantitative effect of inversions has been imperfectly understood because the depth and configuration have been unknown. The purpose of this paper is to present an objective method for predicting the depth of the IocaI inversion and its infIuence on the maximum or hourly temperature using a remote temperature sounding (Great FalIs, 90 miles away) and the local minimum temperature. This is accomplished by assuming the depth of the inversion under clear skies and calm winds is directly related to the minimum temperature and the "temperature" which would occur if no inversion formed"--Introduction.

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