| Central San Joaquin Valley type maps - :14376 | National Weather Service (NWS)
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Central San Joaquin Valley type maps
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    "Type maps have been used as forecast tools by many forecasters over past years. The Fruit-Frost Service in the western states has used type maps effectively for a very long period. There are various methods and procedures to identify or classify maps. This paper is about map typing aimed at a specific forecast problem-forecasting critical minimum temperatures. The various synoptic patterns that precede low minimum temperatures in the Great Valley of California have been typed. Frost or subfreezing temperatures have occurred with all of these types. Of course, the development of damaqing temperatures and their curation can be estimated on some occasions without makina reference to type maps by just using one or two factors (e.g., low afternoon temperatures, low dew points, cloudy or cloudless skies, etc.). However, type maps can alert one as to whether there may or may not be a damaging-temperature forecast problem when critical temperatures are not obvious. This can be important when preparing agricultural forecasts under operational deadlines"--Introduction.

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