What is that nameless brown line on Day-1 and Day-2 SPC outlook graphics?
The brown line is the general thunderstorm forecast line on the categorical outlook, and represents a 10% or greater probability of thunderstorms to the right of the line. We only do general thunder forecasts for Day-1 and Day-2 outlooks at this time, but may attempt day-3 general thunder forecasts on at least an experimental basis in the future.
The brown line is the general thunderstorm forecast line on the categorical outlook, and represents a 10% or greater probability of thunderstorms to the right of the line. We only do general thunder forecasts for Day-1 and Day-2 outlooks at this time, but may attempt day-3 general thunder forecasts on at least an experimental basis in the future. 4.
