Shenandoah sunset, July 23, 2016. ( Nathan Jones via Flickr )

* Heat advisory today from noon to 8 p.m. *

TODAY’S DAILY DIGIT
A somewhat subjective rating of the day’s weather, on a scale of 0 to 10.

1/10: It will feel like 105 degrees or more. Bar none, summer 2016’s worst day.

EXPRESS FORECAST

Today: Oppressive heat and humidity. Highs: 97-102.
Tonight: Chance of evening storm. Lows: 72-78.
Tomorrow: Still hot and humid. Highs: 94-99.

View the current weather conditions at The Washington Post headquarters.

FORECAST IN DETAIL

Our heat wave may reach its height today as the mercury makes a run toward a record-setting 100 degrees. But it’s not exactly going to cool off meaningfully the rest of the week. Most days, if not all, should soar to at least 90 if not several degrees higher. A washed-up front in our vicinity  may act as a trigger for storms at times late each day — but chances hover in the 20 to 40 percent range. Most days are simply sultry with little rain or relief from the heat.

Today (Monday): This is the day when most spots rise into the upper 90s and we may even hit 100, 101 or 102. Today’s record is 100 from 1930 and we have a 50-50 chance to get there. If we manage to hit the century mark, it will be the first time since July 26, 2012. Even if the air temperature falls shy of 100, the combination of heat and humidity produce a punishing heat index over 105 degrees this afternoon into the early evening. Isolated 110-115 heat index readings cannot be ruled out. Hydrate and avoid strenuous activity for long periods. Air conditioning is your best friend on a day like today.  Confidence: Medium-High


Tonight: We can’t rule out a few storms roaming through the region this evening, especially north of town. Given the heat and humidity, any storms that develop could be intense with torrential rain, dangerous lightning and strong wind gusts.  But most places probably avoid rain, keeping it warm and muggy overnight. Lows range through the 70s (upper 70s downtown, low 70s in outlying areas). Confidence: Medium-High

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Tomorrow (Tuesday): Make no mistake … although it’s a few degrees less hot than Monday, it’s still plenty hot. Under partly sunny skies, highs reach the mid-90s in most spots, with some pockets of upper 90s. Humidity is a shade less than Monday, but peak heat index values (what it feels like) are still around 100 or a couple of degrees above. We could see a few thundershowers flaring up in the late afternoon (20 percent chance). Confidence: Medium-High

Tomorrow night: Widely scattered storms may set up in the immediate metro region and especially our southern suburbs. But still, the chance of storms is just around 1 in 3. Most stay storm-free, and it’s muggy overnight — with lows ranging from near 70 in our cooler areas to the mid-to-upper 70s downtown. Confidence: Medium-High

A LOOK AHEAD

The forecast Wednesday through Sunday doesn’t vary much. Each day should be partly sunny, hot and humid. How hot any given day is will depend on the amount of cloud cover and the exact position of a weak, poorly defined front in our vicinity. Generally, highs range through the 90s – probably closer to 95 Wednesday through Friday and down closer to 90 by the weekend. Overnight night lows mostly range through the 70s. Each day features the opportunity for some late-day storms, but generally just 20 to 30 percent or so. Confidence: Medium