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Posted at 5:00 AM ET, 09/14/2009

Forecast: Week Trends from Warm to Wet

By Jason Samenow

* Radar, Temps, & More: Weather Wall | Hurricane Tracking Station *
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EXPRESS FORECAST

Today: Sunny, very warm. 84-87. | Tonight: Clear. 56-65. | Tomorrow: Becoming partly cloudy. 81-85. | A Look Ahead

FORECAST IN DETAIL

Catch some rays while you can over the next two days. After our sunny spell is over Tuesday, cloudy and damp weather will likely settle in for the rest of the week. This dreary stretch may be similar in nature to last week when clouds abound but the exact timing of any rain is difficult to pin down. And, once in a great while, we may get a surprising interval of sunshine.

Today (Monday): With less breeze than yesterday, it won't be as refreshing but still pretty darn nice. Brilliant sunshine will boost the mercury into the mid-80s, with even some upper 80s in a few spots, especially south. Humidity levels will remain quite pleasant (dew points 55-60). Confidence: High

Tonight: Clear and very nice-- a lot like last night. Lows fall to the mid-to-upper 50s in the cooler suburbs, with mid-60s downtown. Confidence: High

Keep reading for the forecast through the work week

Tomorrow (Tuesday): Another really nice late summer day. We'll probably have some high clouds streaming in during the afternoon, but we'll have more than enough sunshine to lift temperatures into the low-to-mid 80s. Winds will be on the light side. Confidence: Medium-High

Tomorrow Night: A weak cold front will drop into the region from the north. So clouds will increase and some spotty light rain is possible towards morning (30% chance). Lows will be in the range of 60-65. Confidence: Medium

A LOOK AHEAD

Wednesday through Sunday look to be a bit unsettled. For a good part of this period, we'll have flow off the ocean (from the east, just like last week) which will be conducive to considerable cloud cover. At the same time, a broad area of low pressure to south will direct additional moisture over the area. So showery weather is likely at times (40-50% chance each day) along with intermittent breaks in the action. The cloud cover will probably hold high temperatures in the range of 70-75, with overnight lows 60-65. Confidence: Low-Medium

By Jason Samenow  | September 14, 2009; 5:00 AM ET
Categories:  Forecasts  
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Comments

Ugh. I am not looking forward to, possibly, 87 today. :(

Posted by: Camden-CapitalWeatherGang | September 14, 2009 11:25 AM | Report abuse

Just back from a cool, windy, cloudy and rainy week at Ocean City. I will *gladly* take the sun and mid-80s warmth :)

Posted by: Dan-CapitalWeatherGang | September 14, 2009 12:13 PM | Report abuse

I like these two days, but not the cool, wet spell beginning Wednesday.

The lower temperature is somewhat welcome, but not the high humidity expected with it. Drying conditions will be rather poor, and mold & allergies will flourish along with it.

According to at least one post on the Eastern U.S. Weather board, we have a stubborn ridge over western Europe to blame for all this. This ridge is effectively blocking the normal westerly flow and causing the entire Rossby circulation to "back up" in the Northern Hemisphere.

To our west a large low over the north central U.S. has actually retrograded to Montana and is causing a warm, dry flow over the Upper Midwest. Here, we keep getting these backdoor cold fronts and moist Atlantic flow, which causes the dewpoint to rise to within 5 or so degrees of the air temperature. Thus we get cloudy, wet spells with poor drying conditions wich seem to last for days on end. I sure wish this would straighten itself out.

Posted by: Bombo47jea | September 14, 2009 12:41 PM | Report abuse

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