Baltimore is bracing for increased heat and humidity as a high-pressure system slides out to sea today. The National Weather Service Baltimore MD/Washington DC notes that residents should anticipate the chances for thunderstorms ramping up through midweek, courtesy of a slow-moving frontal zone approaching from the west. Heat indices will head toward the middle to upper 90s, the service warns, which may trigger isolated showers and thunderstorms, particularly in the Appalachians and near the Chesapeake Bay.
The region could see a smattering of low stratus clouds or patchy fog eroding by midday, providing some relief before the daytime heat accelerates. A frontal zone nears Thursday into the weekend, maintaining a consistent, albeit wet and warm weather pattern. As convection wanes or dissipates tonight, low temperatures will fall into the 70s for most areas, the National Weather Service reported.
Arriving Wednesday, a cold front predicts an uptick in shower and thunderstorm activity. With precipitable water values nearing 2 inches, there's a concern for both downbursts of wind and potential flash flooding threats. Thunderstorms may continue into Wednesday night as the front stalls. Regarding aviation, patchy fog in the morning may briefly reduce visibility before improving to VFR conditions mid to late morning.
Looking to the weekend, the subtropical ridge should fortify, pushing daily high temperatures into the low 90s, with milder weather in the mountains. The best chance for showers and thunderstorms would be Friday with the cold front stalling nearby, the service noted, suggesting a potentially damp start to the weekend. Coastal areas may experience elevated tidal anomalies due to the recent full moon.
For mariners, high pressure provides some stability today, but the shift to a southerly wind this evening could approach Small Craft Advisory levels. The front's approach on Wednesday may require Special Marine Warnings if storms grow in intensity. Keep up with the latest maritime conditions at the NWS Baltimore website.
