A cold start to the weekend, but a slight warm up is ahead

October 31, 2014 0 Comments

Having the coldest air mass of the season descend upon the region on Halloween certainly has been less than ideal timing for us, but at least it appears to be a short-lived cold snap. High temperatures for Halloween in most spots locally are running about 10 to 12 degrees colder than the seasonal norm with upper 30s to near 40 degree readings common. That’s also more typical of the third week of November than the end of October and with cold north winds factored in, it’s a downright winter-like scenario that is playing out. The cold front that has ushered in this cold air has moved to the east and is generating some lake effect snow for the Great Lakes region while we have just cold sunshine in our locale. This will also lead to the coldest night of the season to date with upper teens possible in the spots locally before warmer air and bright sunshine will help the warming process get underway. The upper level winds will begin to shift a bit after today, allowing slightly warmer and eventually more seasonal air into the Upper Midwest and the Great Lakes.

The jet stream has buckled southward allowing cold air to pour into the Upper Midwest. The origin of this air mass is northern Canada in the Nunavat Territory.

The jet stream has buckled southward allowing cold air to pour into the Upper Midwest. The origin of this air mass is northern Canada in the Nunavut Territory.

The jet stream pattern in the upcoming week will become more west-east oriented allowing Pacific modified air into the Upper Midwest, meaning 40s and 50s will be more common than the upper 30s. A couple of cold fronts will bring the prospect of light rain showers to the local area late Monday and later in the day Wednesday, otherwise cool sunshine and brisk winds looks to be the weather story in the Upper Mississippi Valley.

A "zonal" flow pattern in the jet stream will allow slightly warmer air into the region, bringing typical early November weather back to the area for a few days.

A “zonal” flow pattern in the jet stream will allow slightly warmer air into the region, bringing typical early November weather back to the area for a few days.

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