Excessive Heat — Southern Baltimore, Maryland

2011-07-22 · Southern Baltimore, Maryland

Event narrative

Heat indices up to 123 degrees were measured at the Maryland Science Center. A fatality was reported due to the high heat in the city of Baltimore.

Wider weather episode

Strong upper-level high pressure built over the region during the 22nd. Surface high pressure over the Atlantic Ocean caused moist air to move into the region from the south. Strong subsidence underneath the upper-level high caused extremely hot conditions with air temperatures over 100 degrees. The combination of the heat and high humidity caused heat indices to soar up to as high as 120 degrees. The worst conditions were across eastern Maryland where the humidity was highest.

Numerous reports of heat-related illnesses were were received by State Health Authorities on the 22nd.

Source: NOAA Storm Events Database, event_id 338190. Narrative written by the NWS forecast office that issued the report.