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May observations and discussions...


ag3

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The 18z GFS has come in way west and quite a bit wetter much like what the models had a few days ago and what the canadain was advertising for days. Problem is not 1 model at the moment agrees with one another lack of agreement towards any solution at the moment. Hopefully 00z data will solve this issue but at the moment we got a classical nowcasting situation.

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The 18z GFS has come in way west and quite a bit wetter much like what the models had a few days ago and what the canadain was advertising for days. Problem is not 1 model at the moment agrees with one another lack of agreement towards any solution at the moment. Hopefully 00z data will solve this issue but at the moment we got a classical nowcasting situation.

18z Gfs has .50" of rain tonight and like you said way west with the coastal and now has close to 1.75" of additional rain from the coastal alone.

Big shift.

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I wasn't looking so much at the raw NAO and AO numbers as I was the amount of positive height anomalies north

of our latitude. The NAO will rebound but there still should be ridging near the Maritimes like we saw last May.

Agreed. I'm sure we'd all take this pattern in an instant if it were 5 months ago. Plenty of positive anomalies up across Canada / Hudson's Bay region.

It'll be interesting to see if those pos height anomalies persist into June. I found this graph interesting, courtesy of meteorologist Joe D'Aleo. One can see that May is not a good forteller of the summer pattern (often times it can be opposite), but the June pattern has a high persistence through the rest of the summer. Also of note is the high persistance once into N-D, and through meteorological winter (aka the pattern late last Nov was a real bad sign).

r8yxaq.jpg

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Clearing skies working its way into western NJ, the push east is evident, but it appears that Nassau and especially Suffolk stay in the clouds/showers most of the day. I'd bet on clearing or at least improving skies elsewhere outside of areas south and east of the city. What transpires for later tonight with the next wave is still up for debate, but I think that slides mostly east as well by nowcasting trends.

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If the RAP maps are correct on the spc mesoanalysis page shear will got to 50kts in 6 hours and cape will got to 1000 would suggest some strong to severe storms. currently there is a pocket of clearing to the west if it moves in instability would increase rather fast as this is a very moist set up. because of how moist it is most would be low topped but wind could be an issue with the strong shear if it sets up. Also heavy rain fall is going to be an issue with storms this evening some storms could put down high amounts fast.

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If the RAP maps are correct on the spc mesoanalysis page shear will got to 50kts in 6 hours and cape will got to 1000 would suggest some strong to severe storms. currently there is a pocket of clearing to the west if it moves in instability would increase rather fast as this is a very moist set up. because of how moist it is most would be low topped but wind could be an issue with the strong shear if it sets up. Also heavy rain fall is going to be an issue with storms this evening some storms could put down high amounts fast.

Upton mentioned small hail in their discussion.

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If the HRRR is right there would be embedded strong to severe storms and some training which could lead to pounding. given the current instability shear and high moisture set up it seams possible.

By the way for what it is worth radar in NC and Virginia is really starting to organize already a well defined area of heavy rain setting up if trends continue some could really see a surprise in the rain gauge tonight.

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