Autumn arrives officially on Thursday, September 22, at 10:21 am EDT, but wait until autumn conditions this weekend to invade the northeastern United States.
High temperatures much of this week will run around 10 degrees Fahrenheit above average. In some cases, the maximum will be 15 degrees above the average. In many cases, nighttime lows be 5-10 degrees above the average through Friday.
For example, in New York City, temperatures typically range from a minimum of about 60 to a maximum in the 70 stockings during the third week of September. Highs most days of this week will be the least of 80/2 with lows well into their 60s.
People with vacation plans in most of the beaches have warm weather and hot water from Delaware to Cape Cod. However, there will be potential problems as strong waves stirred by Julia and Karl tropical systems.
The only other deterrent to summer conditions will be areas of fog may persist in the middle of the day, according to AccuWeather Chief Meteorologist Elliot Abrams.
“Unlike the long nights July through September, combined with clear skies, light winds and high humidity in this pattern encourage misting evening,” Abrams said.
Thanks in part to Typhoon Malakas curve away from continental Asia, one or more waves and less humid fresh air will invade the Northeast this weekend in the next week.
The transition to the more typical conditions late September start Friday night in the eastern Great Lakes and northern New England and progress to the regions of Delaware and Chesapeake Bay on Sunday.
Temperatures can be trimmed back to normal or slightly below normal. For Sunday, highs ranging from the 50s to upper 60s socks in much of New England and the central Appalachians. In the mid-Atlantic coastal areas, highs will be mainly in the 70s.
Accompanying the arrival of lower temperatures will be windy, if not windy conditions for a time in most places, making it feel even colder.
“The arrival of cold air can occur with little or no rain in much of the mid-Atlantic to southern New England this weekend,” Abrams said.
The air is cool enough so that the risk of scattered frost normally the coldest places from the central Appalachians to northern New England during Saturday and Sunday.
While the cooler and less air will sweep in the northeast, but also ooze south through the Carolinas, Georgia, Alabama and northern Florida next week. For many in the southeastern states, this could be the most important break from the heat and high humidity since spring.
“Despite a couple of pushes fresh air, this month has the potential to be one of the hottest Septembers recorded in some areas,” said AccuWeather meteorologist Brett Anderson Superior.
“There have only been almost every hot days, but have not had many typical September cool nights,” Anderson said.
Beyond this weekend, a pattern of see-sawtooth is reserved in early October, which will favor some changes of warm and cold.
“However, temperatures are likely to still average close above normal along the Atlantic coast,” said lead AccuWeather meteorologist Paul Long Range Pastelok.
Temperatures tend to normal to below normal from the Appalachians in the Midwest.
normal temperatures downward by one degree every two or three days during October.
Factoring in the time pattern anticipated normal temperature trend, frequent highs in the mid to upper 80s are less likely, while highs in the 70s to lower 80s are likely to be more common along the corridor Interstate 95 in the first part of October.