Category Archives: Updates

PHILLY MINIMAL SNOW UPDATE- MONDAY AM

Last nights models have QPF values around 0.06 inches water for the nor’easter that will essentially miss us. This translates into minimal snow.

This amounts to snow showers or snow flurries,  mostly this evening.   Some icy patches possible early Tuesday during the early morning commute.  That’s about it.

Looking back at the forecasts over the past few days, the GFS briefly had more of a snowfall for us, later joined by the NAM; but the other models more  consistently kept the storm offshore.

SNOWSTORM POST MORTEM

An interesting snowstorm, with some aspects forecast correctly and others not.

On the plus side—

  • Precipitation amounts (QPF) were reasonably accurate and timing was pretty good.
  • Snow accumulations are always difficult to predict in March, but there were some official reports of snow totals in the 9-12 inch range at the upper end.  (Official NWS map shows totals were closer to forecast than I realized.)
  • Temperatures were accurately predicted at 32-33.

Interestingly, the Kuchera algorithm NAM snow totals and axis from last night was probably the most accurate!

What was off on the forecast—

  • The heavy snow axis was closer to I-95, not the far north and west as originally thought.  (This was captured by the NAM last night.)
  • Total snowfall was less than the 10:1 (16 inches max prediction)
  • Winds were much lighter (luckily) than had been expected.

I’m ready for spring!