Official National Weather Service forecasts for Baltimore and the upper Chesapeake — Baltimore City and Baltimore, Anne Arundel, Howard, Harford, Carroll and Queen Anne's counties, from the Inner Harbor and Fort McHenry out through Towson, Dundalk and Catonsville, north to Westminster and Bel Air, south down the Bay to Annapolis and the Bay Bridge, and east across the Chester to Centreville.
Every Maryland region shares one system — the same maps, the same live radar, the same climate record. Half of Maryland lives on one estuary, and the water writes the forecast. The Bay holds its heat into December and gives it back as a lake-effect-thin band of rain when everything west of the fall line is snow, then flips in spring and keeps Annapolis ten degrees cooler than Westminster on the same May afternoon. The fall line runs straight through the metro — the same storm can put ice on I-70 at Mount Airy and rain on the Inner Harbor.