* Dense fog advisory through 12 p.m. *

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Today: Foggy a.m., mostly cloudy p.m., mild. Near 60 to upper 60s. | Tonight: Chance of showers late. Near 50 to low 50s. | Tomorrow: Mostly cloudy. 40-50% chance of showers. 50s. | A Look Ahead | Get Express Forecast by E-mail

A somewhat subjective rating of the day’s weather, on a scale of 0 to 10


Mild temps near or past 60 worthy of high grade. But stubborn a.m. fog and probable p.m. clouds prevent picture-perfect look. Get the Digit on Twitter| Discuss on Facebook

A daily assessment of the potential for *accumulating* snow for the next week on a 0-10 scale. More info

SPI: 2 ↑ - Higher elevations north and west of D.C. may see on-and-off mixed precip Mon night through Wed. Light accum not out of question. Get the SPI on Twitter | Discuss on Facebook

The atmosphere is having a major identity crisis. We are entering what is, on average, the coldest week of the year, yet highs today should reach at least near 60. Even with the fog and clouds, it should be a great day to go for a jog, walk the dog, or fire up the grill! A weak cold front moves in tonight and then may linger close to our south. The result is a cooler Monday and much cooler midweek. Some showers are possible tonight into Wednesday, maybe even mixed precipitation in spots starting Monday night. But the uncertain position of the front means overall forecast confidence is on the low side.

Today (Sunday): Like yesterday, expect the fog to slowly mix out from west to east hopefully eroding by around noon. Once the fog lifts, afternoon temperatures should quickly climb at least to near 60, and maybe to the upper 60s in the southern suburbs. Now, the monkey wrench in the equation is cloud cover. Winds from the southeast may very well preserve the clouds overhead, and if they are thick enough then most places may end up with highs in the lower end of the range, especially from near D.C. and to the north. Confidence: Medium-High

Tonight: Very warm by January standards, with lows hovering right around 50 or the low 50s. We should stay dry through the evening, but clouds thicken as a weak cold front approaches, and overnight shower chances increase from west to east to about 40%. Winds from the south shift to come from the west toward morning. Confidence: Medium-High

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

* Dense fog advisory through noon Sunday *

Update, 9:40 p.m. Saturday night: Dense fog is once again developing throughout the D.C. metro region and may last well into Sunday morning. If the fog and low clouds hang tough, temperatures on Sunday may not be as warm as much as initially forecast...closer to the low 60s rather than upper 60s.

Today: AM fog, some PM sun. 54-63. | Tonight: Partly cloudy. 42-49. | Tomorrow: Mostly cloudy, very mild. 64-71. | Get Express Forecast by E-mail

A somewhat subjective rating of the day’s weather, on a scale of 0 to 10


Foggy as to when we’re out of the fog, but stoked for a chance at 60. Get the Digit on Twitter| Discuss on Facebook

A daily assessment of the potential for *accumulating* snow for the next week on a 0-10 scale. More info

SPI: 1 → - It trends cooler next week, but remain skeptical about promising snow chances. Get the SPI on Twitter | Discuss on Facebook

Today’s fog may well put up quite a fight, stalling the sun’s emergence. When the fog finally burns off, temperatures spike but that may require some patience. Sunday’s the warmer of the two weekend days with 70 degrees not out of the question in our southern suburbs. We cool down Monday with likely rain showers.

Today (Saturday): Fog and a wedge of cool marine air (temps in the 40s) hang around this morning and may even stubbornly stick around into this afternoon. There’s a saying “the wedge always wins” and that may be the case, especially northeast of I-95 where highs may only reach the mid-50s. West and southwest of town (towards Warrenton), sunshine may emerge in the morning hours boosting afternoon highs into the mid-60s (or even higher). Around the District, we’ll call for a high just shy of 60, plus or minus a few degrees, with some afternoon sun. Light winds gradually become southerly around 5 mph. Confidence: Low-Medium

Tonight: For the most part, skies are partly cloudy though some more fog may develop late. This time any fog is patchy as opposed to widespread. Lows are mild, generally in the 40s. Confidence: Medium

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

* Dense fog advisory through 10 a.m. Saturday *

It was a raw, cold day, with maximum temperatures only managing the mid-40s. A blanket of fog moves in overnight. Once it finally burns off Saturday, unseasonably warm air bursts onto the scene through Sunday.

Through Tonight: Showers diminish early this evening, then fog builds throughout the region overnight, reducing visibilities to under one quarter mile in spots. Use extra caution traveling. Temperatures hold more or less steady in the low-to-mid 40s. Winds are light.

Saturday: Fog hangs around stubbornly -into mid-morning and, if we’re unlucky, through noon or so. Sunshine first emerges in our west and southwest suburbs and gradually burns off the fog to the east. Highs range from the mid-to-upper 50s where the fog holds on longest to the mid-60s (southwest of town). We’ll say highs right around 60 in the District but there is some uncertainty. Winds become from the south at 5 mph in the afternoon.

Saturday night and Sunday: Mostly clear skies Saturday evening become partly to mostly cloudy late at night. It’s very mild for the time of year with lows 42-48 (suburbs-city). Sunday’s mostly cloudy, but the very warm southerly flow helps us reach into the mid-to-upper 60s. If we get some sunnier intervals, 70+ can’t be ruled out.

See Camden Walker’s forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter. For related traffic news, check out Dr. Gridlock.

A nurse injects a flu vaccine at the Whitman-Walker Health Clinic in Washington, DC on January 10, 2013. The Center for Disease Control and Prevention has said that this year's flu season is expected to be one of the worst the country has seen in 10 years. (EVA HAMBACH - AFP/GETTY IMAGES) Flu has reached widespread levels in 47 states. Does cold, dry weather lead to flu outbreaks? The cold not so much. Dry weather may play a role, although it’s a controversial one.

Some studies have found cold weather may help flu linger in the air, but researchers tend to shoot down the idea it causes flu to spread. They stress flu is mostly transmitted by children moving indoors during the cold months when germs are exchanged rather than by the cold itself.

Dr. Jon Abramson, a specialist in pediatric infectious diseases at Wake Forest Baptist Health, told ABC News the flu season better correlates with the timing of the school year than with temperature.

Rather than cold weather, it may be dry weather which can help predict flu outbreaks.

In 2010, Jeffrey Shaman and colleagues published research showing flu outbreaks often occurred immediately following a dry spell.

A view of the city skyline is seen through snow crusted nettings at a park in Beijing, China, 06 January 2012. (HOW HWEE YOUNG - EPA)

While Australia simmers, China shivers.

Yesterday, I wrote Australia is experiencing what’s arguably its worst heat wave in history. But on the opposite side of the eastern hemisphere, bitter cold air has gripped large parts of central Asia.

The average temperature in China since Nov. 20 has been just 25 degrees F, the coldest in 28 years according to the China Meteorological Administration.

North China is suffering through its coldest winter in 42 years, with an average temperature of 18.7 degrees F, 4.3 degrees F below average writes China Daily.