Weather Underground Forecast for Tuesday, September 13, 2011. A significant storm will begin Tuesday north of the Great Lakes before moving northeastward through Canada as the day progresses. The associated cold front will drape southward into the eastern third of the country, bringing another round of wet weather to the Northeast. This precipitation will not be tropical in nature, as was the last storm to hit the area, thus only moderate amounts of rain are expected.
A second storm will move into the Great Lakes region late in the day, renewing rain and even the slightest chance of early season snow in the Upper Midwest.
The two aforementioned storms will precede a blast of Arctic air that will stream into the Northern Plains and Upper Midwest. This Arctic air will not be as cold as in the Winter, but a definite cooling trend will sweep through much of the northern tier of the country during the second half of the week.
Seasonally typical showers and thunderstorms will pop up through the Southwest as well.
The Southern Plains and Southeast will rise into the 90s and 100s, while the Northeast will see temperatures in the 70s. The Northern Plains will rise into the 60s and 70s, while the Southwest will see temperature sin the 80s, 90s, and some 100s. Temperatures in the Lower 48 states Monday have ranged from a morning low of 30 degrees at Stanley, Idaho to a high of 102 degrees at McGregor, Texas
