What This Map Covers
Map viewport covers Newfoundland and Labrador using recent NOAA GOES East and West Geostationary Lightning Mapper flashes. Newfoundland and Labrador is two very different places in one viewport: the island of Newfoundland out in the North Atlantic, and mainland Labrador reaching north past the treeline. The viewport spans the whole province, including St. John's, Corner Brook, Labrador City. Thunderstorms here are a warm-season pattern, generally June through August.
GLM detects optical flashes from orbit. It does not classify every marker as a cloud-to-ground strike, replace Canadian weather radar, or predict where lightning will hit next. This is not an Environment and Climate Change Canada product and carries no warning status. GLM sits in geostationary orbit above the equator, so it sees Newfoundland and Labrador at an increasingly shallow angle going north. Measured against the live feed, detections stop at roughly 55.5°N — the part of Newfoundland and Labrador above that line is outside usable viewing geometry, not quiet.
Safety limit: absence of a marker never proves outdoor safety. Satellite detections can be delayed or missed, and storms move between refreshes.