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Everything posted by 40/70 Benchmark
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Winter 2022-2023 Promises Plenty of Mid Season Mayhem
40/70 Benchmark replied to 40/70 Benchmark's topic in New England
Tuesday (2/28) Winter Storm Verification Problematic Northern Stream Detrimental to Forecast Here is the Eastern Mass Weather Final Call snowfall forecast map for yesterday's event. Versus what actually took place. Clearly the northern and northeastern third of the forecast did not materialize, as the forecast 2-4" and 3-6" ranges across northeastern Mass verified as 2" or less. However, the northern portion of the forecast area had the worst verification, where 4-8" was forecast for the northern Connecticut river valley and northern Worcester county, and 1-3" verified. The issue is that late northern stream injection of energy that was expected to revitalize the precipitation never materialized, which is where most of the snowfall in these areas was expected to occur, during the afternoon. The marginal low level temps across eastern areas did verify, which is why northeastern areas experienced slightly less snowfall (2" or less) than northern locales well inland (1-3"). In summary, confluence was expected to prevent the heavy snows from reaching the northern and northeastern areas during the first portion of the storm, as evidenced by the soundings referenced in the Final Call. Thus round 1 on Monday night went as planned. But round 2 during the afternoon never materialized. The 3-6" and 2-4" forecast ranges across southeastern Mass and the upper cape verified because enough lift made it into these areas to negate the marginal lower levels to some extent. The rest of the forecast back to the west and southwest verified very well, including the 5-10" of max snowfall over the eastern slopes of the Berkshires, as a result of easterly flow resulting in an upslope component that enhanced snowfall slightly in this area. FINAL GRADE C- -
Feb 28th-March 1st long duration Miller B threat
40/70 Benchmark replied to George001's topic in New England
C- effort on this one...Round 1 went as planned to the west and south on Monday night, but Tuesday PM was a no-show from the N stream insert for round 2 to the north and northeast. https://easternmassweather.blogspot.com/2023/03/tuesday-228-winter-storm-verification.html