vortex95 Posted March 28, 2013 Share Posted March 28, 2013 This morning at 06z, BOS had a 527 1000-500 thickness, it was -4 C at 850 mb with a NW sfc and boundary layer wind, diurnal minimum for sfc temp, and *still* the precip was all rain. Same deal all the way out to 495. Obviously mild enough in the lowest 1000 ft for complete melting to occur. Boundary layer temp at BOS was 2 C. Just goes to show that the empirical rules don't always work. I would have thought the diurnal minimum would have been more than enough for snow b/c you remove the sun this time of year, and it is often a completely different story for ptype. We lacked precip intensity, and it was quite shallow. At 06z it was raining at home and the full moon was very much visible though the thin overcast, so not really any good deep layer vertical motion to mix down the colder air from above to get snow. Is CoastalWx reading this? I recall one time in March,1990 I believe, it was 65 F at 00z with scattered tstms in ern MA, and 8 hours later it was heavy snow with 4-8" total. It's always good to actually see the limits pushed/verified in the real world! Link to comment Share on other sites More sharing options...
CoastalWx Posted March 28, 2013 Share Posted March 28, 2013 Link to comment Share on other sites More sharing options...
dendrite Posted March 28, 2013 Share Posted March 28, 2013 It was even rain up here. Link to comment Share on other sites More sharing options...
Allenson Posted March 28, 2013 Share Posted March 28, 2013 Had a dusting of snow here overnight. 32F. Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted March 28, 2013 Share Posted March 28, 2013 Snow here Link to comment Share on other sites More sharing options...
Damage In Tolland Posted March 28, 2013 Share Posted March 28, 2013 Flurries here now Link to comment Share on other sites More sharing options...
Mr Torchey Posted March 28, 2013 Share Posted March 28, 2013 1-3 for all! Link to comment Share on other sites More sharing options...
ORH_wxman Posted March 28, 2013 Share Posted March 28, 2013 Light snow and a coating earlier this morning. Needed a bit more precip for measurable though...snow never really got below 3 or 4 mile vis -SN. Link to comment Share on other sites More sharing options...
wxmanmitch Posted March 28, 2013 Share Posted March 28, 2013 It was light snow here as well with a dusting. Still a few flurries falling now. A little bit of elevation made the difference between seeing -RA or -SN. Link to comment Share on other sites More sharing options...
Typhoon Tip Posted March 28, 2013 Share Posted March 28, 2013 This morning at 06z, BOS had a 527 1000-500 thickness, it was -4 C at 850 mb with a NW sfc and boundary layer wind, diurnal minimum for sfc temp, and *still* the precip was all rain. Same deal all the way out to 495. Obviously mild enough in the lowest 1000 ft for complete melting to occur. Boundary layer temp at BOS was 2 C. Just goes to show that the empirical rules don't always work. I would have thought the diurnal minimum would have been more than enough for snow b/c you remove the sun this time of year, and it is often a completely different story for ptype. We lacked precip intensity, and it was quite shallow. At 06z it was raining at home and the full moon was very much visible though the thin overcast, so not really any good deep layer vertical motion to mix down the colder air from above to get snow. Is CoastalWx reading this? I recall one time in March,1990 I believe, it was 65 F at 00z with scattered tstms in ern MA, and 8 hours later it was heavy snow with 4-8" total. It's always good to actually see the limits pushed/verified in the real world! Two words: Partial thickness... The lowest partial thickness interval was annihilated by diabatic heating yesterday. It's in part what I have been discussing recently about how this time of year normalizes the thermal fields. The precipiation fall rates were not intense enough to overcome the resulting lower 1300'. The heated ground combined with cloud ceiling arriving at sunset was a radiation barrier -- it's pretty predictable actually. In fact, it rained all the way to Caribou Maine yesterday; I even posted the obs, suggesting it might be difficult to snow given the environmental conditions. Link to comment Share on other sites More sharing options...
dryslot Posted March 28, 2013 Share Posted March 28, 2013 Don't know why anyone would expect anything other then rain with the cool air drainage source region being out of the Canadian Maritime's its been a stale garbage air mass for well over a week now here, And no snow pack to speak of for the air to flow over Link to comment Share on other sites More sharing options...
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