D.C. area forecast: Staying steamy with building storm risks through the week

June 25, 2013

Today’s Daily Digit

A somewhat subjective rating of the days weather, on a scale of 1 to 10.

3
Another day, another shot of “humuggihot” with a small chance of storm relief

Express Forecast

Today: Partly sunny, 30 percent risk of p.m. storms. 89-94.

Tonight: Partly cloudy, humid. 69-74.

Tomorrow: Partly sunny, 30 percent risk of p.m. storms.  90-95.

FORECAST IN DETAIL


Radar & lightning:Latest D.C. area 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.

A ridge of high pressure is pumping heat and humidity into our area.  This particular ridge is a “dirty” one, which does not mean it is embroiled in any sort of typical D.C.-style scandal (no ‘weathergate’ jokes please).  Rather, dirty ridges are not strong enough to fend off pop-up thunderstorms and showers. So, like yesterday, storms may manage to break through the heat ridge and offer us some relief.  Chances of storms go even higher by late week as a front edges into the region, but temperatures and humidity only gradually lower.

Today (Tuesday):  Partly sunny, hot and humid with a 30 percent chance of afternoon to early evening thunderstorms popping up and affecting you.  Highs should range from the upper 80s to low-or-maybe middle 90s depending on the degree of afternoon cloud cover and pop-up storms.  Humidity levels continue in the discomfort range (dew points in the upper 60s).  Winds should be mostly light at 5-10 mph coming from the west and southwest. Confidence: Medium-High

Tonight:  After any evening storms fade, it’s partly cloudy. Summer air masses like these are stubborn to cool down at night, so the risk is probably to the warmer side, but we believe we’ll be able to dip down to the upper 60s (in the cooler spots) to low-to-mid 70s (downtown) with light breezes from the southwest. Confidence: Medium-High

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

Tomorrow (Wednesday): Hot and humid yet again with partly sunny skies as highs move up to the 90-95 range (last year at this time, we already had our first round of upper 90s, so it could be worse!).  The risk of afternoon to early evening thunderstorms picks up to about 30 percent, which could offer some relief.  Humidity levels are high (dew points still range from the upper 60s to low 70s) with light winds at about 10 mph from the southwest. Confidence: Medium-High

Tomorrow night: Partly cloudy and muggy with maybe some evening scattered storms (30 percent risk).  Lows dip into the low-to-middle 70s.  Confidence: Medium-High

A LOOK AHEAD

Thursday ranges from partly cloudy to cloudy, which limit high temperatures to the low 90s, but the humidity sticks in there at moderately uncomfortable levels.  We have a roughly even shot at storms, which could offer some heavier rains.  Thursday night is partly cloudy and still muggy with a 40 percent risk of lingering storms and lows only reaching down to the low-to-mid 70s.  Confidence: Medium

Friday features the heat ridge retreating back to the Western states, leaving behind a sagging frontal boundary and a focus for more showers and thunderstorms.  The front is not very effective in scouring out our humidity, so we still have uncomfortable temperatures that at least do not get as hot as earlier in the week (upper 80s to low 90s) due to more cloud cover and showers/storms (60 percent likelihood). Friday night sees partly cloudy skies, still some lingering humidity, and a 30% chance of showers and storms.  Confidence: Medium

The final weekend of June is not as hot as this work week, however, we continue to be mired in fairly muggy conditions with frequent showers and storm threats (sorry).  Highs should be in the mid-to-upper 80s with variable sky conditions ranging from partly sunny to mostly cloudy skies. The (dirty) ridge leaves our area, but no significant cool, dry Canadian high pressure can push into the area to replace it, so we’re left with this stalled boundary that is the focus for the ongoing precipitation risks. Confidence: Low-Medium

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