Click maps and charts for larger versions, loops, etc. Most graphics update automatically--check timestamps for currency. During updates, maintenance, network outages, etc., graphics may be temporarily unavailable. Graphic sources include NOAA, NWS, University of Wisconsin, Weather Underground, and various other organizations. All products produced by the US government or affiliated organizations are public domain unless otherwise labeled.

Note: For US Eastern Time on maps and charts, subtract 4 hours (Daylight Saving Time) or 5 hours (Standard Time) from UTC / Z timestamp on the maps and charts. UTC / Z / GMT = Coordinated Universal Time / Zulu Time / Greenwich Mean Time -- Time is based on 0° longitude running through the Royal Observatory in Greenwich, London, UK. It is the same all year round and is not affected by Daylight Saving Time (aka Summer Time) clock changes. Using UTC allows weather services and others to avoid time zone conversions. Visit timeanddate.com for more time zone conversion information and additional time-related data.