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By: sullivanweather , 8:32 AM GMT on November 09, 2007
Clipper to bring seasons' frist snowfall to portions of the Northeast.
Pennsylvania, New Jersey, southern New York and extreme southern New England
A pair of disturbances will combine to bring the first synoptic snowfall this season across southern New York State, Pennsylvania and northern New Jersey. A system currently over the Ohio Valley will transfer its energy to a developing low offshore. This system does not have a lot of moisture to work with but does have enough to produce a period of light precipitation during the day on Friday. Lower elevations should mainly see light rainfall but as one heads higher into the hills and mountains precipitation should mix with, and change to snow. Even some of the lower elevations could see a period of sleet at the onset of the precipitation.
Clouds will have spread over most areas that will receive precipitation today by dawn. This will help to keep temperatures down and when combined with dewpoints in the 20's across most of the areas where precipitation type will be an issue, there could be a tendacy towards frozen precipitation. As it looks now, snow levels will range from 1800' across the southern two thirds of Pennsylvania to around 1000' across southern New York. This precipitation will not amount to much during the day on Friday, mainly under a tenth of an inch, with little to no accumulations of snow.
A secondary disturbance, currently north of Minnesota, will quickly dive into western Pennsylvania this evening. This short wave combined with an inverted trough at the surface should provide enough lift and convergence to produce another period of precipitation overnight Friday into Saturday morning. Snow levels will lower and move towards the coast as the night progresses with areas down to the I-95 corridor seeing a mixture by daybreak Saturday. Across the interior light accumulations of snow is likely during the overnight period. Precipitation should taper during the morning hours on Saturday except for eastern Long Island and southeastern New England who could get into some wrap around from strengthening offshore low. There could even be an ocean-effect rain or snow shower over Cape Cod as system pulls away.
Northern New York and the rest of New England.
High pressure over Quebec will keep northern New York and central and northern New England dry on Friday. Skies will be mostly clear across northern Maine with increasing clouds towards the south and west. Temperatures will average about 5 degrees below normal on Friday.
Much of the same is expected Friday night with clipper system staying to the south of the area and high pressure to the north remaining in control.
Benign weather continues into Saturday with temperatures remaining below normal. There will be some gusty winds along the New England coast as pressure gradient tightens between developing offshore low and high pressure to the north.
Skies clear and winds calm by Saturday night making for ideal radiational cooling conditions. Temperatures will remain about 5-10 degrees below normal.
Sunday through Midweek
High pressure will remain anchored over the region on Sunday with mostly clear skies and light winds. High clouds will approach from the west as a weakening trough moves towards the area. Temperatures will remain about 5-10 degrees below seasonal norms.
High pressure begins to move southward Sunday night bringing a milder westerly flow of air into the region. Temperatures Sunday night will average about 5-10 degrees warmer than Saturday night under partly cloudy skies.
Southwesterly flow kicks into gear Monday with temperatures returning to normal levels for mid-November. Skies will remain partly cloudy across New England with increasing levels of cloudiness as one heads southwestward towards Pennsylvania. There could even be some very light rain or drizzle by afternoon in western Pennsylvania. Trough approaches from the west by Monday night which could provide some light rain showers across the western half of the Northeast. With cloud cover and a milder southwesterly flow of air temperatures should climb back above normal.
Trough continues to pull eastward on Tuesday providing most of the Northeast with a chance for rain showers. Continued cloud cover will prevent temperatures from climbing much from overnight lows with high close to average. Since this system will be of Pacific origin the air behind this trough will not cool much. Weak ridge will provide some clearing Tuesday night. Overnight lows will remain close to or slightly above average.
The ridge quickly moves offshore Wednesday morning, giving way to another trough. Southwest flow out ahead of this trough will bring temperatures back above seasonal norms as storm track remains in Canada. Clouds will filter back into the region with light showers breaking out by evening across western sections.
Radar: Northeast Region
Current SST's off the Northeast Coast.
Great Lakes SST's as of 11/02/2007.
Temperature of lake across the street as of 11/9 7:30am: 37°F
November Daily Weather Statistics
November 1st - 53°F/38°F....0.00"....40%
November 2nd - 52°F/30°F....0.00"....90%
November 3rd - 51°F/35°F....0.00"....30%
November 4th - 48°F/36°F....0.00"....15%
November 5th - 52°F/28°F....0.23"....60%
November 6th - 45°F/36°F....0.26"....40% Trace
November 7th - 37°F/27°F....Trace....40% Trace
November 8th - 37°F/19°F....0.00"....60%
November 9th - 38°F/27°F....0.21"....0% 1.5"
November 10th - 37°F/26°F....0.26"....20% 3.1"
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|Dew Point:||11.4 °F|
|Wind Gust:||4.0 mph|
Updated: 11:55 PM EST on February 17, 2014
Town of Lumberland
Glen Spey, NY
|Dew Point:||55.9 °F|
|Wind Gust:||0.0 mph|
Updated: 6:01 AM EDT on June 09, 2014