April 16, 2020
The sky has clear and temperatures are about to drop into the lower 30s and upper 20s for most of our region. In my last report, I suggested that there would be more counties added, and this is exactly what the National Weather Service has just done. Basically all counties east of the continental divide to the coast are under the risk of a hard freeze or frost Friday morning.
The region the two western counties in Maryland were not included, is because their growing season has not been considered to have started. A hard freeze our frost can damage tender vegetation.
The Frost Advisory includes the Maryland Beaches and northern Delaware in New Castle County, where the low temperatures may hold in the mid 30s.
This may seem late in the season for some local areas, but it is still possible to get these conditions in late April even around the water. Given that spring began early after a mild winter, the water has been warm. So this airmass is special to overcome that opposing force.
- Cover plants with a tarp or black lawn garbage bag.
- Bring plants inside
- Remove or open hoses and turn off spickets
Normals and Records
It should be noted that at Baltimore’s BWI for April 17:
Normal Low = 44ºF
Record Low = 26ºF in 1962 (it was 30ºF April 16 in 1962)
When is the typical last freeze or frost?
Low Temperature Forecasts
Compare three different model forecasts and see how much they differ.
I will have an update in the morning with the coldest temperatures likely just before sunrise.
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Baltimore Weather At BWI May Not Be As Hot As Reported
Construction at the airport close to the weather station may be added artificial heat. Click here or the image for the details.
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