Wednesday 10 a.m.
Note: I will be out of the office from until Monday
A major storm causing wild swings in temperature as well as fog, drizzle, rain, sleet, snow, high winds, record warmth, wintry chill, lightning, thunder, hail and tornadoes will move from the Great Lakes today to Quebec by tomorrow. A cold front whipping around the south side of the storm will clear the East Coast by tomorrow morning. This video shows the likely progression of systems in the short term then ventures ahead into next week.
This map shows the areas with the greatest risk of damaging thunderstorms this afternoon into tonight.
The cold front is embedded in a large area of clouds, showers and thunderstorms covering the middle of the country. It will advance past the Northeast coast by the end of the day Sunday. The frontal zone is shown on this picture from late morning Friday.
When weather systems are relatively weak, small scale variations cause forecast uncertainty because several different weather types (such as showers, sunshine, cloudiness, etc.) can coexist in the same region and change constantly. This map shows such a pattern:
Some of the thunderstorms can become severe, with damaging wind and brief cloudbursts of rain. The greatest chance for locally severe storms should be in the "S" areas highlighted on this map (based on the NWS Storm Prediction Center's guidance).
There is a slight risk for severe thunderstorms later today from north-central Tennessee up across Indiana and Ohio to Michigan and eastern Wisconsin (shown by the "S" area on the map below. Thunderstorms are not predicted for areas near the coast from Delaware to New England.
It is not going to snow any time soon, but in any type of weather the flag is a symbol of freedom. This holiday weekend we celebrate the contributions of those who were there to defend the freedoms we enjoy in these times.
Once again, the rain will miss much of central and northern New England. The region has been in a dry spell, as evidenced by its appearance on this U.S Drought Monitor map.