About MPCs' 96 Hr Surface Forecast
About 96 Hr Surface Forecast
Manually produced charts generated once a day from 00Z computer model guidance. The surface forecast relies on guidance based on the NCEP Medium Range Forecast Model (MRF). Additional guidance from the ECMWF and UKMET are used to adjust inconsistencies and to fine tune the final product. Surface forecasts depict the centers of high and low pressure centers with central pressure depicted with 3 or 4 digits. Tropical cyclone central pressure is represented by an "XXX" for unknown. Due to uncertainty concerning the strength of tropical cyclones, an "L" is used to represent tropical systems. The 72 hour and 120 hour forecast positions of highs and lows is depicted by a circle with an "X" inside for highs and an "X" for lows with 2 digits representing the pressure. For example, a "74" would be a pressure of 974 mb and a "20" represents 1020 mb. The 72 hour and 120 hour positions for Tropical cyclones is defined with an "X" for the forecast positions with "XX" representing an unknown pressure.