| LATEST FORECAST (Update two or three times per weekday, and on some weekends, holidays and semester breaks.) |
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DISCUSSION:
As northeasterly flow strengthens tonight into tomorrow, drawing
moisture from the Atlantic up against the eastern slopes of the
Appalachians, and interacts with a
disturbance moving eastward from the Ohio Valley, steadier rain will
overspread northern MD and
southeastern PA this evening and then continue into tomorrow morning
before tapering off during the
afternoon and evening hours. Rainfall amounts should range from a few
tenths of an inch across
eastern PA to between 0.75-1.50" west of the South Mountain Range. A
sprawling high pressure
system over southeastern Canada will then build southward into New
England during the middle of
the week and force the rain farther south and west. However, skies
should remain mostly cloudy on
Wednesday with high temperatures around 10-15 degrees below normal.
This trend will continue into Thursday with
lingering breezy conditions and cooler temperatures.
FORECAST:
Tonight: Cloudy with periods of rain and drizzle. Low: 54-58
Tomorrow: Cloudy, breezy, damp, and dreary with periods of light rain and drizzle High: 60-64
Tomorrow Night: Cloudy, breezy, damp, and dreary. Low: 52-56
Wednesday: Mostly cloudy, breezy, and cool. High: 60-64
Thursday: Intervals of clouds and sun, breezy, and cool. High: 62-66
Issued:
Monday, September 21, 2026 at 05:23 PM.
Student Meteorologists
McGrath, White
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