New Frost Advisory For Wednesday Morning Expanded Area

Tuesday October 17 2017

We had widespred temperatures drop into the 30s this morning and the expected frost lived up to expectations. Baltimore’s BWI dropped to 38ºF making this the colder morning since the second week of May. The cold air is taking hold and will cover a larger area tomorrow morning. Another Frost Advisory has been issued for 1 AM to 9 AM Wednesday October 18 to cover more of Maryland and Virginia. This includes metro Washington DC but not Baltimore. That is due to the warming effects of the Chesapeake Bay.

Here is the advisory map as of 3 PM. The missing shaded counties in southern Pennsylvania are only because there has not yet been an update from the State College local National Weather Service office. It may be added later on and I will update the map accordingly.

Will You Be Affected?

The coldest locations tend to be most noticeable in the fall and winter when there is frozen precipitation or a frost in place. Since warm air will rise, hill tops can be warmer in the morning. Since water retains heat, places nearby will remain warmer as well. Also, urban areas retain heat from pavement and buildings. The most likely places to get frost Tuesday morning will be in the counties shared blue above and:

Inland- Away from water (lakes/reservoirs)
Valleys, especially between larger and steep hills.
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How does this compare to normal?

The average dates for the first frost in this advisory area are October 12 to 26. So despite all of the heat this past month, we are actually ahead of schedule with respect to the cold arriving in central Maryland and metro Washington DC. Click on this link or the map below for more about the seasonal first frost and freeze by region.

In the Cold (and pink) mood?

Trust in this Bust- Limited Edition Shirt

This is not a forecast, but a fundraiser for breast cancer research at BCRF- the highest rated cancer research charity. This soft Bella T-Shirt is to promote the strength of the ‘good bust’ and the heart that beats strong beneath it. Proceeds will be donated in honor of my mother Linda Berk, a 3-time breast cancer survivor. Click on the shirt image to join us.

Get the award winning Kid Weather App I made with my oldest son and support our love for science, weather, and technology. Our 3 year anniversary of the release and our contribution to STEM education is this November. It has been downloaded in 60 countries, and works in both temperature scales. With your support we can expand on the fun introduction to science and real weather.