wpostServer: http://css.washingtonpost.com/wpost2

Most Read: Local

Posted at 04:30 PM ET, 08/02/2011

PM Update: Not as hot Wednesday, but humid with storm risk

Our 16th straight 90+ day is in the books and, remarkably, our 6th straight day at 95 or higher. Both of those streaks may end tomorrow, especially the latter.A potent wave of low pressure will produce clouds and likely showers and storms, capping temperatures. But some partial sunshine may precede the storms fueling their potential while giving the mercury a chance to extend the 90+ streak.

Through Tonight: Skies are mostly cloudy and humidity gradually increases. The hours prior to pre-dawn are dry. Between 4 a.m. and sunrise, a few showers or thundershowers could punch through the region, but it’s not terribly likely. Lows range from the upper 60s in the cooler suburbs to the mid-70s downtown.

Tomorrow (Wednesday): The day begins with considerable cloud cover, but intervals of sunshine are possible through early to mid-afternoon. If we get enough sunshine it does two things: 1) It keeps the 90+ degree streak going 2) It destabilizes the atmosphere greatly increasing the risk of strong to severe thunderstorms starting around 2 or 3 p.m. The good news for our dry soil is that rain is more likely than not throughout the region (60% chance). The bad news is that severe storms may produce damaging winds and even an isolated tornado, mainly east of I-95. High temperatures,depending on sunshine, range from 86 to 93.

See Matt Rogers’ forecast through early next week. And if you haven’t already, join us on Facebook and follow us on Twitter

Pollen update: Walter Reed reports weed pollen is MODERATE, with trees and grasses LOW and mold spores MODERATE.

95+ degree days: CWG’s Ian Livingston tweeted “Today is day 22 of 95+ in DC. Tied for 1st year-to-date with 1991, 5 ahead of last year and 6 off yearly record.”

Oklahoma has hottest month ever: From the Oklahoma Mesonet: “Fueled by exceptional drought and a seemingly impenetrable heat-dome, July roared through Oklahoma’s legendary heat waves of the past to become the state’s hottest calendar month on record. According to data from the Oklahoma Mesonet, the July statewide average temperature finished 7.5 degrees above normal at 89.1 degrees, smashing the previous record of 88.1 degrees set back in July 1954.” (hat tip: Stu Ostro, the Weather Channel)

Excessive heat in Baghdad Monday - first ever government heat day:“Iraq’s central government shuttered its offices and sent public-sector workers home across most of the country as temperatures surpassed 122 degrees Fahrenheit and Muslims began fasting to mark the start of the holy month of Ramadan.” The full story.

Air-conditioned clothing:Due to a lack of power following the nuclear crisis in Japan, a Japanese entrepreneur has invented air-conditioned clothing to help buyers withstand the blistering summer heat. ABC News has more.

By  |  04:30 PM ET, 08/02/2011

Categories:  Forecasts

 
Read what others are saying
     

    © 2011 The Washington Post Company