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Posted at 5:00 AM ET, 08/11/2010

Forecast: Another sizzler, then down to simmer

By Dan Stillman

Best chance of t'storms is Thursday & Friday

* Photos: A pleasant August weekend | Relentless heat roasts Russia *
* Outside now? Radar, temps & more: Weather Wall | NatCast *
* 90+ days in 2010: 50 (Apr-May 5, Jun-July-Aug 45); Record 67 (1980) *
* Interactive sunset map & submit your own | Your weather shots *

updated at 11 a.m.

Today's Daily Digit
 
A somewhat subjective rating of the
day's weather, on a scale of 0 to 10.

 

Not a record-breaker like yesterday's almost was. Still, these bouts with high heat have become tiresome.
 
Get the 'Digit' on Twitter

EXPRESS FORECAST

Today: Mostly to partly sunny, hot & humid. 20% chance of p.m. storm. 93-98. | Tonight: Partly to mostly cloudy. Small chance of evening storm. Mid-70s. | Tomorrow: Partly to mostly cloudy, very humid. 50-60% chance of showers/storms. Near 90. | A Look Ahead | Get Express Forecast by E-mail

FORECAST IN DETAIL

Let's start with some good news for those of you looking for any sign of a light at the end of the tunnel that is this sweaty, hot summer of 2010: On Monday, our average high dropped a degree to 87, and falls to 86 starting this coming Monday (it had been at 88 July 28-Aug. 8, and at the annual high mark of 89 July 16-27). The bad news? Mother Nature has shown a blatant disregard for averages this year, and continues to do so today with highs well into the 90s again. Fortunately, temperatures do trend closer to average tomorrow through the weekend.

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Today (Wednesday): A north/northwesterly component to the light winds and the potential for more afternoon clouds than yesterday aren't enough to make a major dent in the heat. We should still manage enough sun -- a mostly sunny morning and partly sunny afternoon -- to lift highs to at least the mid-90s with moderate to high humidity. Just a 20% chance of a late-afternoon/evening shower or storm. Confidence: Medium-High

Tonight: That small chance of a shower or storm sticks around through evening. Clouds increase through the night as winds shift to come from the east off the ocean. The cloud cover should trap enough heat to keep most spots from dropping below the mid-70s for lows. Confidence: Medium-High

Keep reading for the forecast through the weekend...

Tomorrow (Thursday): A cold front pushing into the area from the northeast puts an end to our latest stretch of well-above-average heat. Instead, it's merely near-average heat -- highs near 90 -- with partly to mostly cloudy skies. A light breeze from the east/southeast raises humidity to the high range. A few morning showers are possible, with scattered showers/t'storms a threat (50-60% chance) for the afternoon and evening. Confidence: Medium

Tomorrow Night: Shower/storm chances persist through evening at about 50-60%, then diminish some overnight. Humidity stays sky high as lows dip mainly to the low-to-mid 70s. Confidence: Medium

A LOOK AHEAD

A similar pattern holds for Friday, when temperatures should be even a few degrees cooler than Thursday. We stay humid with highs in the mid-to-upper 80s. And partly to mostly cloudy skies may yield a repeat performance of isolated to scattered showers and thunderstorms, with around a 40% chance you'll get wet where you are. Rain chances probably go down Friday night. Confidence: Medium

The weekend is shaping up to be a pretty typical one for August. That means no mid-90s to near 100, but rather the more tolerable upper 80s to low 90s for highs, with morning lows in the low-to-mid 70s. It also means partly sunny skies, moderate to high humidity, and the chance of an isolated shower or thunderstorm each day. Confidence: Medium

By Dan Stillman  | August 11, 2010; 5:00 AM ET
Categories:  Forecasts  
Save & Share:  Send E-mail   Facebook   Twitter   Digg   Yahoo Buzz   Del.icio.us   StumbleUpon   Technorati   Google Buzz   Previous: NatCast: Near-90 warmth & some humidity, too
Next: More heat records in reach today

Comments

Good morning. There's little chance we make another record today (which would be 101) but it's broiling out there under a cloudless sky. How hot do you think it will get? Will we match/best yesterday's 98?

Posted by: CapitalWeatherGang | August 11, 2010 9:33 AM | Report abuse

I swear it feels worse than yesterday. And our AC is on the fritz.

Posted by: hereandnow1 | August 11, 2010 9:53 AM | Report abuse

I have a question. We just put a new addition on our house (a beautiful formal dining room). My contractors laid sod around the new room a few days ago. They have watered each day but the job is essentially complete. Should I water the sod every day in this weather and if so, for how long? I don't want to kill it by underwatering or overwatering.

Posted by: authorofpoetry | August 11, 2010 9:56 AM | Report abuse

Not a gardening expert but don't water your grass during the middle of a hot, sunny day. It's useless as a lot of the water will evaporate. Would suggest watering between dusk and dawn. Not sure about quantity.

Posted by: CapitalWeatherGang | August 11, 2010 10:18 AM | Report abuse

hereandnow1, we're starting off a bit warmer today but that should level off in a bit, not that it will matter much at that point.

Posted by: Ian-CapitalWeatherGang | August 11, 2010 10:43 AM | Report abuse

The best time to water in this weather is, unfortunately, in the pre-dawn hours. The Gang is correct that you don't want to water in the middle of the day because it will evaporate too fast, but you also don't want to water in the evening because it will sit on your grass and promote disease. Pre-dawn is the best time for the water to have time to soak in, but also not sit on the blades of grass too long. Very simplistic description, I realize - I am sure some horticulture Nazi will correct it.

Posted by: SouthsideFFX | August 11, 2010 12:47 PM | Report abuse

Thanks for the feedback and advice. I am a novice about this, which may explain why my contractor opted for sod, knowing full well I couldn't grow grass if my life depended on it!

Posted by: authorofpoetry | August 11, 2010 1:18 PM | Report abuse

authorofpoetry - I would not know what to do either. Ugh! It sounds tough.. but definitely water..maybe a couple hours before sunrise.. that's what I have long known/heard to be best. That way the soil won't grow mold or mildew.

Posted by: Camden-CapitalWeatherGang | August 11, 2010 2:23 PM | Report abuse

In a perfect world, watering deeply in the early morning is the way to go, but if you have to water after the sun goes does down, it's better than not watering at all.

Watering at high noon is a surefire way to kill the grass. Ask me how I know.

Posted by: rosilandjordan | August 11, 2010 6:37 PM | Report abuse

The comments to this entry are closed.

 
 
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