29. Gusty northwest winds have been blowing across the region today as a low pressure leaves the area. The high pressure that builds in tonight will bring chances of frost and freezes!! Pressure began falling yesterday, from 30.30 "Hg down to 29.70 "Hg this morning. A low pressure north of Lake Superior (997mb = 29.44 "Hg) is deepening as it moves off to the northeast.
The cold front brought showers across the region as it passed through early this morning (1am to 3am). Here on the hill I measured 0.07". Amounts in northwestern Wisconsin ranged between a trace and tenth.
A high pressure (1025mb = 30.27 "Hg) is quickly sliding in from Manitoba, bringing air from the Northwest Territories down into the Upper Midwest.
The gradient between the departing low and incoming high has created gusty northwest winds today in the area. The Keweenaw Peninsula in the UP of Michigan has had Wind Advisories all day, gusts up to 50mph. Closer to home the gusts have been up to 35mph. My highest gust was 28mph at 12:15 from the west.
End of growing season -- first frost possible tonight
The biggest news is the possible cool/cold night ahead of us. Lows in northern Minnesota will dip into the upper 20s and therefore a Freeze Warning has been issued by the NWS. Central Minnesota and northwest Wisconsin will be near 32 degrees, and so a Frost Advisory has been issued overnight. Low & sheltered areas and valleys are usually the favored spot for frost to develop. Locations near Lake Superior will be a few degrees warmer.
Temps: 45.5 / 64.7 Dewpoint Range: around 45 Barometer Range: 30.30 falling to 29.80 "Hg Wind gust: 8 mph NW at 11:45 Precip: 0.07"