| A technique for generating local pop guidance during stratified precipitation events at Portland, Maine - :6820 | National Weather Service (NWS)
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A technique for generating local pop guidance during stratified precipitation events at Portland, Maine
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A  technique for generating local pop guidance during stratified precipitation events at Portland, Maine
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    "In this study, the three FRHT forecasts corresponding to the beginning, middle, and end of each forecast period were examined for the highest relative humidity (the sum of R2 and R3) and the highest algebraic value of vertical velocity. Note that the highest relative humidity may occur at a different time than the highest algebraic value for vertical velocity as long as they both are within velocity as long as they both are within the same forecast period. Surface observations were then used to determine if measurable precipitation occurred during each forecast period. Combinations of R2 and R3 were divided into intervals of 20%,except the cases where R2 and R3 added up to less than 80% were all grouped together. Likewise, the vertical velocities were grouped into intervals of 1.0 microbar/sec,except values less than -1.0 microbar/sec were all grouped together, as were values greater than or equal to 6.0 microbar/sec"--page 3.

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