#MEwx Cold, rain, snow or sleet with an explanation of "Inverted Trough" in weather forecasting. It's all waiting for you at:
If you want to se weather readings from my personal weather station in real-time click here.
We're under a winter Weather Advisory that is posted immediately before this one.
This morning we have freezing rain, areas of fog, a chance of sleet or chance of snow this afternoon. Little or no snow and sleet accumulation, ice accumulation of a tenth to two tenths of an inch are possible. Highs in the mid 30s with light and variable winds.
Tonight we'll have partly cloudy skies with a slight chance of snow in the evening, then mostly clear after midnight. Lows around 18°F with West winds 10 to 15 mph gusting to 35 mph.
The wind direction is East Northeast between 2.0 MPH and 6.5 MPH.
The Relative pressure is 29.61, the Absolute pressure is 29.41 and falling with a weather graphic indicating clouds and rain/snow/sleet.
We received 0.15 inches of rain/snow here over the past 24 hours.
Visibility is 10.0 miles / 16.1 kilometers with clouds and some form of wet stuff, be it rain, sleet or snow.
The UV rating is 0 out of 16, the moon is 90.0% illuminated, the moon phase is waning gibbous, sunrise is 7:12 am↑ 123° Southeast, Sunset is 4:03 pm↑ 237° Southwest, Moonrise is 7:11 pm↑ 59° Northeast, Moonset is 9:59 am↑ 303° Northwest and we'll have 8 hours 51
Minutes of daylight today.
What the heck is a "inverted trough" in weather forecasting?
The local weather forecaster on TV has used the term "inverted trough" a few times lately and I didn't know what that is. So, I looked it up. The explanation is below, and I found it on a real good web site with loads of different kinds of information that you might want to read through. I've copied the text below, but the pictures, as you may expect, are much better than a thousand words. The web site is:
https://www.theweatherprediction.com/habyhints/126/
"WHAT IS AN INVERTED TROUGH?"
METEOROLOGIST JEFF HABY
In the mid-latitudes of the Northern Hemisphere a
Trough is usually seen as a southerly bulge in the
height contours
. The lowest heights are generally located to the north of the trough. In an inverted trough situation, the height contours bulge to the north. This is
more common in the tropical regions where regions of low pressure ride south of a mid-latitude high pressure but can happen in the mid-latitudes when low
pressure is south of high pressure. An inverted trough bulges to the north. At first it may look like a ridge, but on further inspection it is a trough.
Both a trough and an inverted trough have a cyclonic (counterclockwise) flow pattern. A trough will tend to have more westerly winds associated with it
while an inverted trough will tend to have more easterly winds associated with it. If an inverted trough is actually a ridge then the winds will be flowing
with the height contours in the opposite direction (anti-cyclonic direction). The direction of windflow through the feature is how a ridge is discerned
from an inverted trough.
Tropical waves will show up as inverted troughs because they are generally south of mid-latitude high pressure and have an easterly wind associated with them.
Also, you may have heard the term "GFS" during the local weather forecast lately. GFS stands for "Global Forecasting System."
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