You will need to click on these maps to enlarge them to see the features I wanted to bring to your attention. These are images taken from the 6Z run of the GFS forecast model. There are many sophisticated models, and you never write forecasts from them in stone. In fact, I've seen the GFS go from 2 inches of rain for day 6 in one run (4 runs daily) to no storm system at all on day 6 in the next run. You always take these maps with a big grain of salt...
Understand at this moment the National Weather Service office in Raleigh has "mostly sunny" for Christmas Day in the Triad. Below, the map indicates rain switching over to snow by the end of Christmas Day.
The one line of interest is "the 540 line", which is a general rain-snow demarcation. This storm is tapping both the Gulf and Atlantic, and on the northwest side is pulling down pretty cold air...cold enough for snow. The top map is for Christmas morning, and the bottom one is for Christmas evening.
The 540 line is down into the Foothills, and would naturally move east and then north. The precipitation would end in the night...and these were the last two frames in the 6Z run, so I can only interpolate out from 'em.
Remember: these are only models and come with zero guarantees...except the guaranty that it will most likely change in the next model run!
Understand at this moment the National Weather Service office in Raleigh has "mostly sunny" for Christmas Day in the Triad. Below, the map indicates rain switching over to snow by the end of Christmas Day.
The one line of interest is "the 540 line", which is a general rain-snow demarcation. This storm is tapping both the Gulf and Atlantic, and on the northwest side is pulling down pretty cold air...cold enough for snow. The top map is for Christmas morning, and the bottom one is for Christmas evening.
The 540 line is down into the Foothills, and would naturally move east and then north. The precipitation would end in the night...and these were the last two frames in the 6Z run, so I can only interpolate out from 'em.
Remember: these are only models and come with zero guarantees...except the guaranty that it will most likely change in the next model run!
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