Considerable cloud cover today held temperatures in check, mostly below 80 degrees. But a warm, humid airmass is in place so more sunshine this weekend should give temps a boost, pushing us well into the 80s to even near 90 by Sunday. A front very slowly edges into the region, offering a chance of storms Sunday and especially as Labor Day progresses.
Through Tonight: Lots of clouds tonight and a bit humid. As a result, temperatures won’t fall much, with lows in the low 60s in the cooler suburbs with upper 60s downtown. Like last night, can’t entirely rule out a thundershower, especially to the west and northwest (10-20% chance)
Tomorrow (Saturday): We should have more sunshine than today, allowing temperatures to break through today’s resistance around 80 degrees, probably reaching into the mid-80s. You’ll also notice a fair amount of humidity. Thunderstorm chances late in the day are just 10-20%, with the highest odds towards the mountains. Partly cloudy and muggy Saturday night, with lows in the mid-60s to low 70s (suburbs-city)
Sunday and Labor Day: Southerly flow both days mean humid conditions. On Sunday, the mercury makes a run at 90 degrees with a 30% chance of p.m. storms. On Monday, highs top out in the low-to-mid 80s with a 40-50% chance of storms, particularly towards evening.
Pollen update from Walter Reed: Tree poll is LOW but weed and grass pollen are MODERATE.
Outer Banks before and after Irene: The USGS has posted a series of before and after aerial photos of the Outer Banks showing the impact of Irene there, highlighting several breaches that severed a state highway and moved large volumes of sand inland.
Potential for heavy rain event Tuesday-Thursday next week: Heavy rains are possible in the D.C. metro region in the middle of next week as the remnants of tropical storm Lee get absorbed into a stalled front over the area. The European model simulates 3-6” of rain and the GFS model 2-4”. Higher amounts are projected over the mountains. As there is considerable uncertainty in the timing, track and intensity of Lee, this is a low confidence forecast. Stay tuned for updates.