Wednesday July 19

Here comes another heat wave! It is July after all and the last one didn’t last too long. This one will build and the irony is that the heat may help to limit the storms. A large area of High Pressure is dominated the eastern US. We get under that ridge and the temperatures warm throughout the column of air above us. That means rising air that would build a storm has trouble riding high enough when it is already warm. *We need cooler air aloft to get the ground heat to build up.

So looking at the map under the heat ridge, you can see a ‘ring of fire’ around the edges. This is where the air aloft is cool enough to allow storms to form… and we will be just on the edge as some showers are best lined up for southern Pennsylvania this afternoon. This could reach northeastern Maryland.  But we will all be in the heat as temps reach the mid 90s and Heat Index values approach 100ºF in the cities. See the quick look below:


90ºF  Tuesday’s High at BWI

87ºF Normal High today

103ºF Record High in 1930

5:56 AM Sunrise

8:29 PM Sunset

Simulated Radar:

The edge of that ring of fire is indicated as being in Pennsylvania. There may be a line of showers/storms forming in the afternoon, that could clip York County and then drop into Harford and Cecil County in Maryland. The beaches should hold on to a mostly dry day.

[metaslider id=49765]

Temperatures And Heat Index



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.



We could stay in the thick of this for a while… An increased chance of storms will build this weekend, but the heat will not fully break until next week.

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Maryland Trek 2017

Be part of my 4th annual hike and bike across Maryland this August. See my trek page and sign up for information to do one day, the whole week, or even sponsor this great event.

Milestones this year:

  • I will do my 1000th mile
  • We aim to reach $100,000 for Cool Kids Campaign

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Faith in the Flakes

The store is closing for the season. Next week we wil be shifting back to spring mode. This will include a severe weather STEM assembly program.