Monday's weather update from WTOC meteorologist John Wetherbee

May 13, 2013 

It's more like April 13 than May 13. An unusual pattern is setting up across the country with a blocking high shutting down just about every storm threat for most of the week. The cool start felt great this morning. It will be even cooler tomorrow morning, then we'll see a slow warming trend. Morning clouds were caused by one last vort max lobe this morning as a deep trough pulls off into the Atlantic. Now we enjoy lots sunshine with stronger northwest winds for the rest of the day. That sets up a near-perfect night of radiational cooling. Models suggest below normal cool for one night: low 40s near U.S. 301, mid 40s west of Interstate 95, upper 40s in town, and low 50s on the beaches. There's no threat to any vegetation. We'll see wall-to-wall sunshine Tuesday with winds swinging northeasterly and again Wednesday with southwesterly winds. That adds more humidity mid-week. Storms in the Gulf will stay south across Florida. Storms over the northern plains stay north across the Great Lakes. The next Pacific system runs into our elongated high across the eastern two-thirds of the country and gets washed out. So we stay dry. Models are thinking the high will wobble late-week as it starts to weaken, opening the door to the next wave coming across the Gulf. It's the wrong direction for anything tropical, but Gulf water is warming into the 80s, which supports increased convection. Could we get a late-day thunderstorm Friday or Saturday? It's too early to say. The trigger maybe what happens up north that may slide farther north into Canada. Meteorologist John Wetherbee, CBM

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