Cold For May…Watch The Tomatoes!

May 13th, 2013 at 7:49 am by under Weather

We have some very cold air moving into the region. At least for May.  So you may need to cover your tomatoes tonight.  Also, please don’t throw any tomatoes at the screen!  I am just the messenger.

So here’s what’s happening.  We have a big mass of cooler air that dropped out of Canada and into the Midwest.  Yesterday this made the push into the Mid-Atlantic and Northeast states.  Also parts of the southeast.   So as there is a mass of colder air, there is also a big dip (trough) in the jetstream over the eastern U.S.  Meanwhile record high temps lie over the western U.S. with a lot of ridging aloft.

Cool Today & Tomorrow

Cool Today & Tomorrow

The dip in the jetstream is working to create a weak area of low pressure at the surface which is just offshore.  The effect will be increasing clouds and even a few sprinkles or a light shower later today. These clouds will reinforce the chilly air.  So highs will be in the low/mid 60s with a few upper 50s north of the metro.

Forecast High Temps

Forecast High Temps

Tonight we will see some clearing and near record cold temperatures.  Lows will be in the low/mid 40s in the metro.  There will probably be some upper 30s inland.  So some flowers and garden vegetables (especially tomatoes) may need to be covered up tonight.  I don’t think there will be much in terms of frost, but I wouldn’t rule out some very patch frost in some of the typically colder/rural areas.  Tomorrow we will see more sunshine as the upper level trough begins to push out.  Highs will still be in the low/mid 60s.

With the high May sun angle, we are ripe and ready to heat things up.   So the heat that is over Denver today will make a huge surge into the eastern states by Wednesday.  In fact highs will spike up to near 80 on Wednesday with mid 80s on Thursday.

Temperature Trend

Temperature Trend

It looks like the warm weather will stick around into next weekend.

Speaking of warm…CO2 levels are the highest that they have been in millions of years.  We hit 400 parts per million.  Here is more on the subject from the Capital Weather Gang: CO2 concentration.  Interesting that we have near record cold temperatures with that recent headline.  But again, this recent cooling is regional and temporary.

Meteorologist: Jeremy Wheeler

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