Summary of proposed changes (see PNS for further details):
(1) Addition of station-based guidance for ceiling height and visibility that provides the forecasted start and end times of flight categories and provides probabilistic information. Products include:
a. Expanded sub-hourly bulletin containing guidance valid for 15-minute periods out to six hours, updating every 15 minutes (96 cycles per day).
b. New extended hourly bulletin containing guidance for hourly projections out to 38 hours, updating each hour at the nominal HH:30 UTC LAMP cycle times.
c. New simplified bulletins that indicate the start day and time and end day and time in UTC for each flight category.
(2) Updated hourly categorical visibility guidance at stations to improve over-forecast biases.
(3) Addition of ceiling height and visibility guidance for 335 stations in the “LAV” and “LEV” text bulletins and BUFR message. A list of the 335 stations that will have ceiling and visibility guidance can be found at
https://vlab.noaa.gov/web/mdl/lamp-stns-add-2023
(4) A bug fix to correct a misrepresentation of unlimited ceiling height in the Alaska GLMP ceiling grids.
The website below contains additional information about the LAMP/GLMP v2.7 upgrade and links to sample prototype guidance: https://vlab.noaa.gov/web/mdl/experimental-lamp
