D.C. area forecast: One more day of humidity and storms – some severe – before sweet relief

July 15

Today’s Daily Digit

A somewhat subjective rating of the day’s weather, on a scale of 1 to 10.

4
Cooler than yesterday at least, but still humid with pesky storms

Express Forecast

Today: Variably cloudy and humid with storms likely. Highs: 87-91.

Tonight: Scattered storms, cloudy. Lows: 60-67.

Tomorrow: Clearing, low humidity. Highs: 79-84.

FORECAST IN DETAIL


Radar & lightning: Latest regional radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Hang in there!  The long-promised, polar vortex air is streaming our way with expected arrival late tonight into tomorrow.  Before we get there, we must tolerate another day of  high humidity and potentially intense storms.  Showers and storms continue tonight before the cool front sweeps through to deliver three days of plentiful sunshine and low humidity.  Unfortunately, we have a disturbance targeting our weekend with more showers and storm potential, but high temperatures should still run cooler-than-normal helping us work deeper into July without truly oppressive heat.

Today (Tuesday): Mostly cloudy and humid with scattered showers and storms in the morning which then become more numerous again in the afternoon.  Some storms could be severe, with very heavy rain, lightning and damaging winds.


Highs range from the middle to upper 80s to the low 90s in some spots. Clouds and bouts of rain should at least diminish the duration of peak temperatures.  Humidity is high with dew points ranging through the uncomfortable low-to-mid 70s.  Rainfall totals should average around a 0.5″, but locally 1″+ is possible, especially east of the city.  Winds blow from the southwest at 5-10 mph.  Confidence: Medium

Tonight: Mostly cloudy with scattered showers and storms continuing but gradually decreasing in coverage and intensity.  Rain amounts from a .25″ to .5″, but locally higher totals  in spots especially east and south of the city.  Winds shift overnight to start coming from the northwest at 5 to 10 mph, which starts to dry out our humidity toward dawn. Lows range mostly through the 60s (upper 60s downtown, low-to-mid 60s elsewhere).  Confidence: Medium

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend…

Tomorrow (Wednesday): Here we go!  Partly cloudy in the morning and breezy (winds from the northwest at 5 to 10 mph), but humidity levels (and dew points) collapse, so the morning feels very comfortable (open those windows).  Becoming mostly sunny toward midday and afternoon with highs reaching near 80 in our areas to the northwest, and mostly low 80s elsewhere.   Confidence: Medium-High

Tomorrow night: Few clouds around, but temperatures fall fast towards expected lows from the fantastic mid-to-upper 50s in the outer suburbs to the still-comfortable low-to-middle 60s in the city with continued low dew point readings.  Light breezes from the northwest at 5 to 10 mph.  Confidence: Medium-High

A LOOK AHEAD

Thursday continues the cooler narrative with mostly sunny skies and highs in the lower to middle 80s.  This day has the best shot of being the nicest of the week as humidity holds to very low levels for July.  Thursday night is cool and comfortable with lows in the 60s.   Confidence: Medium-High

Friday may be mixed with morning sunshine and an afternoon increase in cloud cover.  Temperatures remain pleasant with lower to middle 80s for highs and still humidity levels on the lower side of what’s common in July.  Highs work their way to the low to middle 80s.  Friday night sees increasing clouds with a chance of a shower or thunderstorms as lows drop to the middle to upper 60s.   Confidence: Medium

Unfortunately, the weekend must contend with a weather disturbance moving through the area that leads to mostly cloudy skies with scattered showers and storms; it won’t rain the whole weekend, with the afternoon/evening hours favored.  The good news is that clouds/rain keep high temperatures running below normal (middle 80s), but the intermittent damp conditions are not welcome to planned weekend activities (and after our current robust surplus, do we really need any more rain??).  Also, the overnight temperatures are  bit more humid again with middle 60s to near 70.  We’ll keep an eye on this disturbance to see if anything shifts, but for now, it looks on the wet side.   Confidence: Low-Medium

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