Weather Warnings:
Severe Weather Warnings for Maryland
National Warnings, Watches & Advisories
National Weather Service Main page for DC/Baltimore
National Severe Storm Center Outlooks   Radar/Outlooks overlay
Lightning Strike data for Maryland

Waves and Tides:
Thomas Point Lighthouse   
Chesapeake Bay Water Temps  (Satellite   Map)      Bay Weather Forecast           Bay Wind Forecasts       
Tide predictor   Tides for USNA/Severn River/Annapolis

Local Radars for Anne Arundel County/Balto/Wash. D.C.
Accuweather     Accuweather "MetroRadar"      Intellicast                     Intellicast  Local Loop    WRC-TV 4 (Wash DC) Interactive radar

Weather Maps:
Intellicast SurfaceWeather Map (3 hr updates)  Wunderground
Current Surface Map (US) from AMS - (CHECK DATE/TIME!) alternative site (from Unisys)   AMS "DataStreme" Maps  
NWS Surface Analysis    NWS Forecast Surface Weather Maps
Canada Sfc maps: 12Z  00Z     
Make your own weather map... (a very powerful visualization tool!) 
NE U.S. Weather Page      NCAR real-time Weather Data
Mid-Atlantic weather plot    alternative site   Maryland maps
Roadway Weather Stations in MD (and links to road info!)
Historical Weather Maps:  since 2003    1871 through 2002

Observations and Forecasts
Local Observation & Forecast    from NWS    from Weather.com
Ocean City Current Weather and Forecast
Local Forecast Discussion  (technical but interesting to read!)
 WBAL Weather      WRC (Washington DC) Weather

Satellite Images:
Satellite Images From U.W Madison       Latest:  VIS  IR  
 Animated (Loop) Images:    VIS  IR  WV   or  VIS  IR  WV
Meteosat Satellite Images  (Europe/Africa):   VIS  IR   
Explanation of infrared (IR) & visible (VIS) images

Numerical Models:      Penn State "Electronic Wall"       ECMWF (European Forecast Models)     ECMWF tropical loop    ETA    NGM    MRF (10 day)      Canadian    European   U.S. Navy NOGAPS        NCEP Model Matrix (all of them!)
Other Opinions:  Dr. Jeff Masters blog (WxUnderground)