Shades

I would bet higher maxes in JFK in late Srping/early summer on a NW/N flow than LGA, and even some days well into the summer depending on the dry adiabatic. That flow is coming off the mainland of Queens and the Van Wyck - I count expressways as a type of topography in these parts.

http://wxcaster.com/models_text.htm

In regard to sleet impacts on road conditions subsequent of snowfall, this can be a treacherous scenario given the cold BL temperatures <32 in affected areas. Treated roads have a much harder time in melting heavy sleet rates than snowfall in many cases. I believe this is partly due to the effects of dendrites being more susceptible to melting given their molecular structure. Sleet is more consolidated/low porosity (solid- if you will), and therefor there is less air pockets (as compared to snowfall) for warming on treated roads. Depending on rates, sleet can compound on treated roads. Sleet atop snow can further stymie the melting process. Road conditions with this storm may be a case scenario.

I'm confused. Maybe my math is wrong. Isn't 1980's and 1970's also a 20 year span? Who's to say that years of below normal snowfall aren't anomalous? After all when we're talking anomalous, we're talking data derived from an average of extremes.

I'm in Maspeth, Queens, northwest-central part of the county. I encountered 3 rounds of shovelings, 2 last night, one this morning. During those intervals, measured 3 inches around 7pm, another 2-3 inches around 9pm. We mixed thereafter for several hours, heavy sleet rates around midnight when I let the dog out, reminiscent to a hail storm; compacting much of the snow that wasn't already shovelled. I thought that would be it as far as significant accumulation. Recall reading the AFD from OKX mentioning maybe an additional 1-3 during the early morning hours for NYC-metro as dry-slot and warm tongue were contentious. Woke up at 6am, and stepped out to and additional 4-5 inches (very difficult to measure due to drifting), the base layer was sleet, since I had shovelled the night before preceding the change-over; atop that though, it was a heavy mass of dendrites. Total event thus far as this wraps(-around)... approx 9-11" in northwest central Queens; close to a foot in drifts of white cement.

What implies an accident in meteorology? I don't recall coming across this phenomena in the field.

https://vimeo.com/444658299 Video recorded from Maspeth, Queens, during inner bands. Wet microbursts evident, potential vortices embedded.

I have 3 minutes of footage from Maspeth, Queens, from a near attic window of a series of wet micro bursts, with apparently brief spin-ups within each. Large branches down surrounding blocks. I am in the process of uploading. Preceding the onset, firetrucks were slowly going down the streets with sirens on. This is what I imagine a tornado siren feeling as a New Yorker.