Marylanders north and west of the I-95 corridor can expect freezing temperatures tonight as high pressure, clear skies and calm winds combine to drive temperatures to 32 degrees and below.

Forecasters at the National Weather Service office in Sterling, Va. have issued a freeze warning (light blue on the map) for tonight:

"A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR
HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER
SENSITIVE VEGETATION."

The warning does not include Baltimore and its suburbs in Anne Arundel, Prince George's and Charles counties, where frost "advisories" are posted: 

"A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED." 

"Patchy frost" is expected in Baltimore City and the suburbs of southern Baltimore County.

In the meantime it was plenty chilly this morning north of the city. We had a low of 36 degrees here on the WeatherDeck in Cockeysville. Must have been a chilly start for the Susan Komen Race for the Cure in Hunt Valley, too. Here are some low readings across the region

BWI:  42 degrees

Reagan National: 44 degrees

Annapolis: 49 degrees

Dulles International: 41 degrees

Hagerstown: 35 degrees

York, Pa.: 39 degrees

When they finally post it this morning, the NWS will have these overnight lows for the region. Be sure to check the date on the map. In the meantime, here are links to amateur weather stations across Maryland, from Weather Underground, including The Baltimore Sun.