Monday 8:30 AM
Oklahoma had a really hot summer. The average temperature was 83.1, more than 2 degrees above the long-term average. From July 18th through Aug. 9th, only one day had a high temperature of less than 100, and on that day (Aug. 5), it was 99! Today, however, Oklahoma City had its earliest subfreezing reading ever! However, even though it is chilly out this morning, the chill will soon be out of the area. And, in the Northeast, where a couple of chilly shots are coming in this week, next week could very well be milder.
It is national metric week, and supporters encourage people to jump in with both feet and support the metric system every inch of the way.
In weather forecasting we jump back and forth with units, but I think the main yardstick of public acceptance is people still want their temperatures in fahrenheit. There is a good reason for this. In our common experience, the coldest day in winter is often around zero while the hottest day in summer approaches 100. A zero to 100 scale is quite attractive. In contrast, people get out the bug killer when they see millipeders or centipeders in their homes! I mean, suppose gram is coming over. One of the main attractions of metric units is how basic measurements get decimated.
Today is dry throughout the Northeast and most of the Great Lakes region, but people wonder if the weather will stay the same furlong. Will it be okay for yardwork? Since it will be dry today, things look good. The same applies for construction crews who have to install footers. It will be dry across the 378 kilometers between Chicago and Detroit today. Rain will spread through the I-95 corridor later today and tonight. We estimate that the many areas will get less than a quarter of an inch of rain (less than a centimeter). It is often difficult to fathom exactly how much rain a storm will deliver when it is just in the formative stages like this one, but by most measures, it seems there will be on-and-off rain and drizzle from gray skies.
Sometime we get snow showers across parts of the Great Lakes and Northeast in mid-October. However, results from various metrics studies suggest we could wind up with a foot in our mouth if we give such predictions more than an ounce of trust at this point. In fact, temperatures could inch higher next weekend. Want updates? Follow the liter, AccuWeather.com
That moisture may move away for the afternoon, but thunderstorms will erupt farther west where morning and midday sunshine adds fuel to growing cumulus clouds. This forecast map from the main U.S. model suggests little or no rain in the I-95 corridor from Maryland to Maine tomorrow afternoon.
The surface pressure pattern looks chaotic today, with a multitude of trough lines. A few of these can be caused by glitches in the data, but any of the real ones could be all that's required to organize a short band of showers or thunderstorms. However, these features tend to change character with time, or they disappear and new ones pop up.
Here's a cool fact: even when Death Valley, California, has a temperature of 110 or 120 degrees, you only have to go up a little more than 3.5 miles to find temperatures at or below freezing.
It appears the dry comfortable air mass now in the Northeast will be replaced by a humid flow from the South Atlantic states for the coming weekend. An upper-air forecast map sequence in the video shows how this could happen. The following map shows the predicted flow from Florida to New Jersey Friday night.
This map shows the pressure analysis for the Northeast and Great Lakes. The gusty flow on the west side of the low pressure area adds a real autumn feel to the air.
Since individual lines and clusters of thunderstorms have limited life spans and change character constantly, forecasting whether it will or won't rain at any one time this weekend is difficult at best. One solution is to have your tablet or phone available with the AccuWeather.com app so you can see where all the storms are at the times when it concerns you the most.