Monday, 10 Dec 2018

December may have a snowy appearance, while temperatures will jump

November 30, at the top of the Christmas tree of the White House. (Joe Flood via Flickr) In November, a winter aperitif was offered, with the largest amount of snow in the month since 1989 and the coldest temperatures since 1997. If you like winter, then the month of December should be more exciting. The trend is developing, so we should have colder expanses, as well as snow flurries, as of the first 10 days. December in brief Temperatures: We expect temperatures close to normal. It has a chance to become the second month of December in a row colder than normal. The average temperature should be between 38 and 41 degrees (the normal over 30 years is 39.7 degrees). Rain: We expect a continuation of the rainy conditions compared to normal, with enough rain to make 2018 the wettest year ever recorded. The total amount of rain and precipitation melted and frozen should reach 3.5 inches or more (the normal over 30 years is 3.05 inches). Snow: The November snow was above normal and, with an average of 2.4 inches over 30 years in December, I think we can do it again. We have a chance of snow this weekend and, even if that is missing, we would have additional chances by the end of the month. My call is four inches or more for December. But if you like snow in December, keep this in mind: Recent history has not been easy, and it's usually not a particularly snowy month. Average snowfall is only 2.3 inches, compared with more than five inches in January and February. And since 2000, December has had only five times a snowy December:
Snowfalls show a significant long-term decline in the Washington area, but some trends are surprising.]Forecast Rationale Despite the low December rains recorded in recent years, some ingredients are at least needed to tip the balance towards the slightly higher precipitation this year. The Blob: A large area of ​​hot water currently present in the North Pacific tends to be associated with high pressures on Alaska, which, when present, can bring cold air into the Lower 48 Warmer than normal ocean temperatures in the central and eastern tropical Pacific Ocean are developing. Above normal precipitation tends to occur in the southeastern and mid-Atlantic littoral during these episodes.
Satellite (AVHRR) estimated surface temperature anomalies in the Blob and El Niño areas. Early day: The first half of December should be about two to three degrees colder than normal, according to current models. A storm from the south is possible this weekend, which could provide snow. However, uncertainty is great as to the distance to come from the north.[[[[
The Washington area could sit on the brink of a winter storm this weekend]

Post Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: