Ample Moisture

April 30th, 2013 at 9:33 am by under Weather

You may have noticed that the humidity has increased quite a bit in the last couple of days.  Many ladies heading out the door have been worried about bad hair days returning.  Of course as my coworker Cheryl Tan said:  “There are no bad hair days if you have enough hair spray”.  Yesterday we had widespread rainfall as predicted.  It became more showery in the afternoon, but it put down a solid 1.5″ across the region.  I had many weather watchers and instruments record readings close to that.  Today we had more fog and drizzle than rain.  The fog was very thick in many locations.  There were even 4 school delays in North Carolina.

Fog This Morning

Fog This Morning

A large area of higher moisture was pushing in off of the ocean.  This helped create the rain yesterday, and it led to the reduced visibilities this morning.  We’ll hold onto a lot of clouds today with some peeks of sunshine.

Satellite/Radar

Satellite/Radar

I do expect pockets of drizzle, but I don’t see a high chance for actual rain showers.  (20-30%).  The winds will continue to bring in the cool marine air from the Atlantic.  This is coming off of the area of high pressure near Nova Scotia.  There is also a weak trough near the coast.  This is a line of lower pressure that is also a windshift line.  It is where the isobars kink on a map, as opposed to a close area of low pressure where the isobars connect.  Anyway, that will help to create a few of those showers in the region.

Today's Forecast

Today’s Forecast

Tomorrow the models show a deeper layer of moisture.   So the chance for rain goes up a bit.  (40-50%).  Our high temperatures will be in the mid-upper 60s for the next few days due to this cool weather pattern.  There will be some heat to our west today with highs in the 70s and 80s across parts of the Plains and Midwest states.

Forecast Temperatures

Forecast Temperatures

The heat to our west will be replaced by a large and unseasonably cold air mass. This will be accompanied by an upper level low and more wet weather.  As we go into the weekend that system will sit over the central U.S. for a few days. Meanwhile we will develop more high pressure along the coast.

Finally, whether or not you believe in Global Warming, you have to acknowledge the abnormally cold air that has resided over other parts of the country recently.  Here is an article from USA Today that sums up some of the recent cold: Cold Weather Pattern     I talked in a previous blog about how the persistent and abnormal cold/warm weather patterns over the last couple of years can be attributed to very long blocking patterns.

Meteorologist: Jeremy Wheeler

 

2 Responses to “Ample Moisture”

  1. Marc says:

    Great blog Jeremy. You bring up an interesting point and I have a very interesting question for you if you have the time. Ok so its May, the sun angle is higher so therefore snow accumulation should be twice as hard as the winter months. So my question is how is it that the projected High in Denver today is 80 and on Wednesday they are calling for snow and accumulation of a couple of inches but yet here in the winter months we will have only 50 degree temps one day and then the next day we get snow but not much accumulation because it was 50 the day before? I just don’t get how with it being 80 today the ground temps to me would have to be way to warm for snow to stick especially when we can’t even get snow to stick when its only 50 the day before. Thanks. I’m pretty sure elevation has to do with it I just thought its weird how they can in May with 80 degrees 2 days before and we can’t in winter with 50 the day before.

    1. Jeremy Wheeler says:

      Hello Marc. That’s a good question. The elevation is the reason that they can get snow in Denver this time of year. Temperatures generally cool with height in the atmosphere. As per the wild temperature swing…Remember we have had days like that around here. If I remember right it was warm just before the March snowstorm of 1980 (Circus storm). The trick is how much snow can accumulate in a short period of time. Initially the snow will melt. however, if the snow is heavy enough, then it can overcome the warm ground. Basically, this won’t allow enough time for the snow to melt. So that layer of snow/ice on the surface will cool the ground enough to let it stick. The layer acts as a temporary buffer between the warm ground and frozen snow. Hope that answers your question. Thanks for commenting! Jeremy

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