1 PM Monday June 19

A Severe Thunderstorm Watch has been issued and now includes Pennsylvania and Maryland through this evening. Warnings have been issued and as off post time we are tracking a band into Adams and York County PA until 1:45 PM. Remember that a watch means it is possible, and this one goes to 8 PM. If a warning is issued, that means it is happening and being tracked in specific counties. I think the threat is still very likely in central Maryland into the evening. Storms may contain winds to 70 mph, large hail, and there is enough wind sheer to produce possible tornadoes.

Compare the Doppler Radar to the NAM 3 KM and HRRR Models. The image already shows the leading edge of the storm line well east of the modeling… And the timing is faster than this morning’s projection.

Also note that there may be two surges on the cold front. The initial line of storms and then a second wave this evening. The energy should weaken as it crosses the Bay into southern Maryland and the beaches… arriving by midnight.

Doppler Radar

Radar Simulation Slider —>

Note: The HRRR Model is much more aggressive and shows the line into Baltimore at 3 PM. This model tends to be over sensitive, so that is the time frame I will be using to see if this has a handle on the rest of the evening. The NAM model on the other hand is running slow. It shows the initial line breaking up at 3PM and well west of Baltimore, but then resurges around 6-7 PM

NAM 3 KM Model

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HRRR Model

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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.

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  • I will do my 1000th mile
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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.