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Does anybody know of a weather website/app that has precipitation type radar extrapolated into the future?

 

"Future radar" when rain is the only ptype has inaccuracies as is.  Add in the additional uncertainty of evaporation/melting/freezing along a mixed precipitation boundary, and I doubt a future radar would be particularly useful.  Your best bet would probably be to look at short-range mesoscale models e.g. the HRRR. 

 

Look for the row labeled "precip type":

http://rapidrefresh.noaa.gov/HRRR/Welcome.cgi

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RadarScope is the best by far, in my opinion. It does show precip type along with just about every other type of advanced radar. You can upgrade $10 annually for lightning data as well with 20 frames back. A+ app. However, as others have said, no app or site will show accurate future radar. RAP/HRRR models are great short range models to check out to try to predict it

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This is the WAFB tv station app I found. It uses WSI's RPM model and you can pan all around the US. Unfortunately it only showed simulated radar out to 6 hours at most. Some days it only is run out to 4 hours ahead. post-3697-0-97203900-1416081959_thumb.pn

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I use the college of dupage site. 

http://weather.cod.edu/satrad/

Nexrad sites and select the Hydrometer Classification from the side tab.

 

Ehh the Hydrometeor classification product leaves a lot to be desired sometimes. I find myself using correlation coefficient to observe mixing boundaries (where the CC drops down below 0.9) . It worked really well for the warm frontal snowfall that fell in KALB early on Monday and was spot on with the changeover from snow to sleet to rain.

 

For a "future cast" you are better off looking at high resolution model output (4km NAM, 3km HRRR) which normally do a reasonable job. Many different web outlets output these products in real time (e.g. Penn State EWALL http://mp1.met.psu.edu/~fxg1/HRRRNW_CUR/cloop.html)

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