August began with temperatures in the balmy 80s today. Seasonably appropriate, agree? Partial sunshine in the afternoon potentially adds fuel to storms developing to our west, and they may increase in strength as they work toward D.C. and the Interstate 95 corridor.
A flash flood watch in effect for the region indicates the potential for slow-moving storms to deliver 1 to 3 inches of rain overnight, but the National Weather Service notes in its watch text there’s the chance of even more rain: “There is some risk for a corridor of much higher rainfall totals and the potential for more significant flash flooding occurring somewhere in a zone between the northern Shenandoah Valley and the Washington DC Metropolitan Area," the NWS states. This could cause flooding of creeks and streams along with urban area flash flooding, if these storms materialize.
The threat of hazardous weather may continue until Tuesday, as we watch Isaias’s impact on our region, too.
Through tonight: Hit-or-miss storms are expected this evening — mostly between about 7 and 11 p.m. A few could be severe with flooding downpours, damaging wind gusts, and hail. Even a couple of tornadoes cannot be ruled out. Rain may start earliest west and southwest of town, and slowly move toward the northeast later in the evening. A warm front is the main culprit, advancing northeastward through the region. Not everyone will see storms.
Mugginess increases toward sultry levels. Dew points could hit or exceed the very humid 75-degree mark, adding discomfort to low temperatures in the mid-70s to near 80 degrees.
View the current weather at The Washington Post.
Tomorrow (Sunday): It’s hot and very humid behind our overnight warm front. We should see a bit more sunshine than clouds, which further helps boost us into the low to mid-90s for high temperatures. Late day has the highest chance for showers and storms. Of the thunderstorms that move in again from the western part of our region, a few could have flooding downpours and damaging wind gusts — perhaps even some small hail.
Southwest breezes may be noticeable, gusting above 15 to perhaps 20 mph at times in the afternoon. We’ll also need to watch the combination of heat and humidity — the heat index — which could approach the near-dangerous 105-degree threshold in a couple of spots. Hydrate, please!
Isaias may impact the entire East Coast
In case you have not seen all of our Isaias coverage, make sure you start with the latest update on East Coast impacts. By the time the tropical cyclone arrives in the Mid-Atlantic, it should mainly be a heavy rain threat for our region, with flooding concerns even ahead of Isaias from potentially severe storms over the next few days. Not ideal.
If you are looking for drier weather and don’t mind serious heat, consider Phoenix your new hotspot destination — it barely gets below 90 degrees there, even at night!