9:22AM
DAYS 1-5 (FEBRUARY 9-13)
Dry and cold is the theme of the weekend, and we have quite the wind event in progress, one that I underforecast somewhat. Mount Washington, NH, as of the writing of this blog, recorded a peak wind gust of 148 MPH this morning, their strongest gust in over 10 years. The wind is being caused by the difference in pressure between a departing storm in eastern Canada and a strong area of high pressure approaching from the west. Although the center of the high will pass south of New England late Sunday, it will be close enough to help winds relax, beginning tonight, leading to more tranquil conditions Sunday. We have been eyeing for several days now the period of February 11-13 for potential unsettled weather and now that it is fully within the this 5-day forecast section a little more detail will be attempted. First, an initial wave of low pressure will pass south of the region and the air will be too dry over New England for a snow area extending fairly far north of it to make it into New England without largely drying up, so Monday will probably be a filtered sunshine or patchy cloud cover kind of day, but dry and fairly chilly. A larger storm center will travel northeastward through the Great Lakes, a favored track this winter, on Tuesday before moving into eastern Canada during Wednesday. While many models have been forecasting a stronger secondary low forming closer to southern New England, I believe this feature will remain weaker until it passes the region, and the primary low will remain dominant. This would mean that precipitation would arrive Tuesday, probably as snow, with some accumulation, but we would avoid both a major snowfall as well as a significant icing situation as the circulation should allow it to warm up significantly both aloft and at the surface to change the precipitation to rain across the forecast area. Now keep in mind that all along I have been warning of model performance being very poor beyond 3 days, and I’ve taken that into account here, letting the overall known and fairly persistent pattern to be my main reasoning for leaning strongly in the direction I am going with this forecast. But as always, things can change and I will keep a close eye on the evolution of the upcoming storm threat. I do believe the progression of this system will be quick enough that we dry out before Wednesday is over, regardless of its details. And speaking of details…
TODAY: Mostly sunny. Highs 28-35. Wind NW 15-30 MPH with gusts 35-50 MPH. Wind chill often below 20.
TONIGHT: Mostly clear. Lows 11-18. Wind NW 10-25 MPH with gusts 30-40 MPH early, gradually diminishing. Wind chill near 0 at times.
SUNDAY: Partly cloudy. Highs 30-37. Wind W 5-15 MPH.
SUNDAY NIGHT: Variably cloudy. Lows 15-22. Wind light W.
MONDAY: Partly sunny. Highs 28-35. Wind NW up to 10 MPH.
TUESDAY: Overcast. Snow develops during the day then transitions to sleet/ice/rain at night. Lows in the 20s. Highs in the 30s.
WEDNESDAY: Cloudy start with rain showers likely. Partly sunny and windy thereafter. Temperatures rise to 40s then fall to 30s.
DAYS 6-10 (FEBRUARY 14-18)
Dry, seasonably chilly to start the period. Next storm threat in the February 15-16 window looks at this time like a Great Lakes cutter, but plenty of time to adjust and refine. Dry and cold follows this but we may need to look for a low pressure wave to the south (low confidence on this chance).
DAYS 11-15 (FEBRUARY 19-23)
The long-shot potential threat of a colder system to the south close enough to bring snow exists early in the period but with very low confidence in this outlook for now. Overall pattern trends a little drier and is variable in temperature.