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 Showers and a few strong thunderstorms with strong winds are expected to continue over the northwestern Bahamas, south Florida, the Florida Keys, the adjacent Atlantic waters and the Florida Straits. This system has a low chance of becoming a tropical cyclone by Tuesday afternoon as it treks northwestward at about 15 mph into the Gulf of Mexico.
Elsewhere in the East, deep moisture from the Gulf of Mexico will maintain chances of rain and thunderstorms along the Gulf Coast.
To the north, a cold front will extend from southeastern Canada through the Great Lakes into eastern South Dakota, while waves of low pressure trek near the the front into the Northeast and the Mid-Atlantic. This activity will translate
into showers and thunderstorms near the frontal boundary and into the Northeast. There is a slight risk of severe thunderstorm development in the
lower Great Lakes, upper Ohio Valley and the inner Northeast with damaging wind and severe hail events.
Finally, hot temperatures will continue from the southern Plains into the
northern Plains and eastward across the mid-Mississippi Valley and into the western Ohio Valley. Expect
heat advisories to persist for much of these areas as daytime highs climb into the 90s and mid-100s.
In the West, a trough of low pressure in the jet stream will move through the Pacific Northwest with onshore winds. Expect chances of showers and thunderstorms to persist in the Northwest, with large hail possible in eastern Montana. To the south, monsoonal moisture spread across the Four Corners with chances of showers and thunderstorms.
Temperatures in the Lower 48 states Sunday ranged from a morning low of 41 degrees at Stanley, Idaho, to a high of 105 degrees at St. Francis, Kan.
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