The arctic high moved into our region last week as expected, but the timing of its arrival couldn’t have been worse, resulting in widespread frosts as overnight lows ranged from +2 C to -4 C. That said, it’s looking like this might be the last shot of really cold air, as a more summer-like pattern takes hold across our region. While this pattern will bring milder temperatures it will also bring increasing chances for showers and thundershowers.
This forecast period starts off with an area of low pressure sliding through southern regions, steered by a southwesterly flow in the upper atmosphere. This system will bring showers and thundershowers to most regions on Wednesday before sliding off to the East on Thursday. We will see a short break in the weather on Thursday and Friday as weak high pressure builds in. Over the weekend another low is forecast to track northeastward out of the northwestern U.S. This low looks as though it will track a little farther south, which should result in partly cloudy skies and a good chance of afternoon or evening thundershowers on Saturday. High temperatures during this period should be in the 20 to 25 C range, with the warmest temperatures hinging on plenty of sunshine. Overnight lows should be around +10 C.
The upper-level pattern looks like it might become split next week as an upper-level ridge tries to develop to our west. This should help to dry us out as the upper flow becomes more westerly. Surface high pressure should dominate during the first part of the week and this, combined with the building upper ridge, should result in high temperatures climbing back into the upper 20s or possibly even the low 30s if the western ridge pushes far enough to the East.
Usual temperature range for this period: Highs, 18 to 28 C; lows, 5 to 14 C.