Archive for category: Short Term Forecast

An artic airmass over Southeast Canada that will begin filtering into all the zones gradually through this evening Temperatures have started falling into 40s over many of the zones this morning. Temperatures likely remain steady through in mainly in the 40s, through the midday hours. then slowly fall into 30s later this afternoon, from north to south across all the zones.

Later tonight, clouds will begin increasing from the southwest, as mid-level disturbance moves east from the Lower Ohio Valley. Temperatures will continue to fall down into lower to middle 20s over Interior zones to upper 20s to lower 30s over the coastal plain.

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We’re getting a nice break from winter for a few days, as a large Northeast Pacific ridge which had given us our Arctic cold has since retrograded, which shifts all the cold air well to our west and north. However, there is still some remnant influence of the North Pacific ridging, as most of Canada is still quite cold. This means that there can still be transient bursts of cold air in an otherwise warm pattern, and that’s what will be happening starting on Friday evening.

The Pacific Jet will be expanding towards the West Coast, but the flow will slow down a bit on the West Coast. This often causes a split flow where some energy digs into the Southwest US, yet due north you get a small ridge in NW Canada. This helps force some of that cold air in Canada further southeast, towards our area and leads to a lot of confluent flow, while the energy in the Southwest US amplifies a Southeast ridge. Thus, we get an extremely strong gradient where a lot of moisture can theoretically ride.

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