As Baltimore braces for a shift in weather patterns, the National Weather Service has put forth a forecast that indicates cooler temperatures and potential frost. With Canadian high pressure making its way southward, residents should expect dry conditions and daytime highs settling into the low to mid 60s, accompanied by winds gusting at approximately 20-25 mph this afternoon. This shift ushers in colder nighttime lows, plummeting to the range of 30s to low 40s, according to the National Weather Service.
With the cooler air descending upon us, there comes an uncertainty around the development of frost tonight due to the expected elevated winds. These winds are anticipated to prevent decoupling and restrict frost formation, particularly for those to the east of the Blue Ridge, where conditions still dip to the 30s outside major cities. Contrarily, west of the Blue Ridge, less windy valleys are likely to encounter light or calm winds, which ups the likelihood for widespread frost, resulting in a Frost Advisory being issued for the area. Furthermore, in the Alleghenies, where temperatures are forecasted to hit the freezing mark, a Freeze Warning is now in effect.
Looking forward to the weekend, the high-pressure system will remain predominant over the region on Friday before moving offshore. This pattern ensures continued dry weather and northerly winds transitioning to southerly on Saturday, which will bring back warmer temperatures in the upper 60s to low 70s. Overnight, the mercury is expected to stay generally in the 40s.
Sunday will see a more dynamic change, with a strong cold front expected to cross the area late into the night, paving the way for warmer and slightly more humid conditions ahead of the front. Showers and perhaps a few thunderstorms could accompany the front midday Sunday through the middle of the night Sunday into early Monday, the National Weather Service reports. This active system suggests potential IFR or MVFR conditions impacting aviation, and mariners may face strong winds with Small Craft Advisories possible on Sunday and Monday.
The region is not without its fire risk today, given the combination of gusty winds and low relative humidity. North to northwest winds are anticipated to gust around 20 to 25 mph, accompanied by minimum RH values hovering at 25 to 35 percent. Nevertheless, the potential overlap of the strongest winds and lowest RH values isn't significant enough to trigger widespread concern, allowing for marginal fire weather conditions without a Fire Danger Statement at this time.
Regarding maritime conditions, those navigating the Chesapeake and its tributaries should anticipate Small Craft Advisory conditions persisting through Friday morning, with winds expected to ease as the high pressure settles overhead. Mariners are also advised to keep an eye out for Special Marine Warnings later Sunday afternoon due to possible gusty showers or thunderstorms linked with the approaching cold front.
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