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| Storm’s second wave: Snow accumulation possible through tonight, PM commute could be slick in spots | |
| (about 1 hour later) | |
| * Winter weather advisory through 10 a.m. Tuesday * | * Winter weather advisory through 10 a.m. Tuesday * |
| Northeast storm coverage | Some have NYC snow envy | |
| 4:30 p.m. update: Patchy snow showers continue in the region, but nothing terribly substantial for the moment. We still think a coating to 2 inches of snow is possible overnight (see update below). We should stress that, even if it doesn’t snow that much, below freezing temperatures will cause iciness on untreated surfaces. Black ice may be as big an issue as snow overnight. With the sun going down, roads will freeze much more easily. In places that are getting snow, it is increasingly sticking and we have reports of sidewalks getting slick. Please use extreme caution on roads, sidewalks and driveways tonight. | |
| Given areas of iciness likely to develop overnight, we think there is a chance of delays throughout the region Tuesday morning. | |
| SchoolCast: | |
| FedCast: Outside chance of delayed opening. 50-50 chance of unscheduled leave-telework option. | |
| This is the last update in this post. Stay tuned for our PM Forecast Update, coming out around 5 p.m . | |
| 3:45 p.m. update: The National Weather Service is still forecasting 2-3 inches of snow tonight, although most of the model guidance we’ve recently reviewed suggests more like an inch of snow. | 3:45 p.m. update: The National Weather Service is still forecasting 2-3 inches of snow tonight, although most of the model guidance we’ve recently reviewed suggests more like an inch of snow. |
| Although scattered snow showers are pretty likely through this evening with a possible steadier period after 8 or 9 p.m., the bottom line is that the snow forecast remains uncertain. | Although scattered snow showers are pretty likely through this evening with a possible steadier period after 8 or 9 p.m., the bottom line is that the snow forecast remains uncertain. |
| Snow that falls may tend to be localized. Some areas could see 1-2 inches, some not much at all. So we’re sticking with our forecast for a general coating to 2 inches through Tuesday morning. | Snow that falls may tend to be localized. Some areas could see 1-2 inches, some not much at all. So we’re sticking with our forecast for a general coating to 2 inches through Tuesday morning. |
| 3:10 p.m. update: Scattered snow showers, mixing with rain in D.C. south and east, continue – with the best coverage north of the city. If and where the intensity of the snow picks up, it’s cold enough for the snow to stick. We’re seeing that around Clarksburg (upper Montgomery County) and Frederick now with a snow shower coming through. | 3:10 p.m. update: Scattered snow showers, mixing with rain in D.C. south and east, continue – with the best coverage north of the city. If and where the intensity of the snow picks up, it’s cold enough for the snow to stick. We’re seeing that around Clarksburg (upper Montgomery County) and Frederick now with a snow shower coming through. |
| Flakes are getting bigger in Clarksburg., MD at 308. @wusa9 @Toppersweather @ericagrow @AllysonRaeWx @capitalweather pic.twitter.com/1XdC8VkoEf — Howard Bernstein (@hbwx) January 26, 2015 | Flakes are getting bigger in Clarksburg., MD at 308. @wusa9 @Toppersweather @ericagrow @AllysonRaeWx @capitalweather pic.twitter.com/1XdC8VkoEf — Howard Bernstein (@hbwx) January 26, 2015 |
| Flakes are getting bigger in Clarksburg., MD at 308. @wusa9 @Toppersweather @ericagrow @AllysonRaeWx @capitalweather pic.twitter.com/1XdC8VkoEf | Flakes are getting bigger in Clarksburg., MD at 308. @wusa9 @Toppersweather @ericagrow @AllysonRaeWx @capitalweather pic.twitter.com/1XdC8VkoEf |
| — Howard Bernstein (@hbwx) January 26, 2015 | — Howard Bernstein (@hbwx) January 26, 2015 |
| @capitalweather Snow's picked up in downtown Frederick, MD for the last 15 minutes & it's sticking to sidewalks & side streets. — Melissa Rabey (@mrabey) January 26, 2015 | @capitalweather Snow's picked up in downtown Frederick, MD for the last 15 minutes & it's sticking to sidewalks & side streets. — Melissa Rabey (@mrabey) January 26, 2015 |
| @capitalweather Snow's picked up in downtown Frederick, MD for the last 15 minutes & it's sticking to sidewalks & side streets. | @capitalweather Snow's picked up in downtown Frederick, MD for the last 15 minutes & it's sticking to sidewalks & side streets. |
| — Melissa Rabey (@mrabey) January 26, 2015 | — Melissa Rabey (@mrabey) January 26, 2015 |
| Increasingly, any snow showers that develop this evening will have the opportunity to accumulate given temperatures near or below freezing and declining daylight. | Increasingly, any snow showers that develop this evening will have the opportunity to accumulate given temperatures near or below freezing and declining daylight. |
| 2:15 p.m. update: Radar shows widely scattered snow showers working from southeast to northwest on the east and north side of town. These snow showers may briefly reduce visibility, but should not have much impact on the roads. | 2:15 p.m. update: Radar shows widely scattered snow showers working from southeast to northwest on the east and north side of town. These snow showers may briefly reduce visibility, but should not have much impact on the roads. |
| Some of the latest short-range model information suggests the best chance for accumulating snow this evening may be between about 8 p.m. and 1 a.m. – although it may come in narrow bands (and be hit or miss). That’s good news for the PM commute, although scattered snow showers around and falling temperatures, per the update below, could cause some slick spots. | Some of the latest short-range model information suggests the best chance for accumulating snow this evening may be between about 8 p.m. and 1 a.m. – although it may come in narrow bands (and be hit or miss). That’s good news for the PM commute, although scattered snow showers around and falling temperatures, per the update below, could cause some slick spots. |
| 1:10 p.m. update: Outside of D.C.’s northern suburbs, where light snow and mixed precipitation is falling, there’s a lull in the precipitation. As the afternoon wears on, we should keep an eye to the east and northeast to see if bands start to redevelop, and rotate southwestward. This will happen as the coastal storm – already developing (see the falling pressures off the coast in the image below) – cranks up. | 1:10 p.m. update: Outside of D.C.’s northern suburbs, where light snow and mixed precipitation is falling, there’s a lull in the precipitation. As the afternoon wears on, we should keep an eye to the east and northeast to see if bands start to redevelop, and rotate southwestward. This will happen as the coastal storm – already developing (see the falling pressures off the coast in the image below) – cranks up. |
| Pressures off Mid-Atlantic coast falling about 1mb per hour now. pic.twitter.com/9EIH3Lj3X2 — Anthony Sagliani (@anthonywx) January 26, 2015 | Pressures off Mid-Atlantic coast falling about 1mb per hour now. pic.twitter.com/9EIH3Lj3X2 — Anthony Sagliani (@anthonywx) January 26, 2015 |
| Pressures off Mid-Atlantic coast falling about 1mb per hour now. pic.twitter.com/9EIH3Lj3X2 | Pressures off Mid-Atlantic coast falling about 1mb per hour now. pic.twitter.com/9EIH3Lj3X2 |
| — Anthony Sagliani (@anthonywx) January 26, 2015 | — Anthony Sagliani (@anthonywx) January 26, 2015 |
| Temperatures at 1 p.m. are mostly in the low 30s (although Reagan National Airport – frequently a warm spot – reports 35). Such temperatures near the freezing mark are not an issue during the middle of the day – and roads are mostly just wet. But I am concerned about slick spots becoming common on untreated roads late this afternoon and this evening as the sun goes down, temperatures fall a few degrees, and snow bands potentially re-develop. | Temperatures at 1 p.m. are mostly in the low 30s (although Reagan National Airport – frequently a warm spot – reports 35). Such temperatures near the freezing mark are not an issue during the middle of the day – and roads are mostly just wet. But I am concerned about slick spots becoming common on untreated roads late this afternoon and this evening as the sun goes down, temperatures fall a few degrees, and snow bands potentially re-develop. |
| Noon update: A band of snow from D.C. to near Laurel continues to drift northeast. It is reducing the visibility in spots and even coating some side roads on its north side. After it passes, we’ll likely see snow intensity diminish and our southern suburbs may continue to have just spotty mixed precipitation. However, new waves of snow should build as the afternoon wears on. Late afternoon into this evening is the time period we’re most concerned about for the possibility of meaningful accumulating snow that could cause travel issues. | Noon update: A band of snow from D.C. to near Laurel continues to drift northeast. It is reducing the visibility in spots and even coating some side roads on its north side. After it passes, we’ll likely see snow intensity diminish and our southern suburbs may continue to have just spotty mixed precipitation. However, new waves of snow should build as the afternoon wears on. Late afternoon into this evening is the time period we’re most concerned about for the possibility of meaningful accumulating snow that could cause travel issues. |
| @capitalweather coming down pretty good in Laurel. pic.twitter.com/yc6ATpLQ0E — michael curtin (@mcurtin00) January 26, 2015 | @capitalweather coming down pretty good in Laurel. pic.twitter.com/yc6ATpLQ0E — michael curtin (@mcurtin00) January 26, 2015 |
| @capitalweather coming down pretty good in Laurel. pic.twitter.com/yc6ATpLQ0E | @capitalweather coming down pretty good in Laurel. pic.twitter.com/yc6ATpLQ0E |
| — michael curtin (@mcurtin00) January 26, 2015 | — michael curtin (@mcurtin00) January 26, 2015 |
| @capitalweather snow now sticking to sidewalks in downtown Silver Spring. pic.twitter.com/wkAmzIyXzH — Starlight Geek (@starlightgeek) January 26, 2015 | @capitalweather snow now sticking to sidewalks in downtown Silver Spring. pic.twitter.com/wkAmzIyXzH — Starlight Geek (@starlightgeek) January 26, 2015 |
| @capitalweather snow now sticking to sidewalks in downtown Silver Spring. pic.twitter.com/wkAmzIyXzH | @capitalweather snow now sticking to sidewalks in downtown Silver Spring. pic.twitter.com/wkAmzIyXzH |
| — Starlight Geek (@starlightgeek) January 26, 2015 | — Starlight Geek (@starlightgeek) January 26, 2015 |
| Original post from 11:05 a.m. | Original post from 11:05 a.m. |
| The first wave of the storm this morning may have been underwhelming, dropping just coating or so of snow in the immediate metro area. But this wave is transferring its energy into a new bigger storm off the coast, causing snow to redevelop over the area through the afternoon and continuing, at times, overnight. This is the same storm forecast to wallop the Northeast with one to three feet of snow. | The first wave of the storm this morning may have been underwhelming, dropping just coating or so of snow in the immediate metro area. But this wave is transferring its energy into a new bigger storm off the coast, causing snow to redevelop over the area through the afternoon and continuing, at times, overnight. This is the same storm forecast to wallop the Northeast with one to three feet of snow. |
| Temperatures near freezing and snow could make for a difficult rush hour. Although snow has mostly not stuck on roads so far, as the day wears on, falling temperatures could change that. | Temperatures near freezing and snow could make for a difficult rush hour. Although snow has mostly not stuck on roads so far, as the day wears on, falling temperatures could change that. |
| Our general forecast is for a coating to 2 inches from this second wave, although some new model information coming suggests the upper end of that range may be likely and that the “boom” scenario (of 2-4 inches) is in play – especially along and east of I-95. UPDATE, 3:00 p.m.: Newer information does not support a boom scenario. | Our general forecast is for a coating to 2 inches from this second wave, although some new model information coming suggests the upper end of that range may be likely and that the “boom” scenario (of 2-4 inches) is in play – especially along and east of I-95. UPDATE, 3:00 p.m.: Newer information does not support a boom scenario. |
| Some localized moderate to heavy snow bands are possible – especially late this afternoon into this evening. It is difficult to say exactly where and when these bands will set up, so stay tuned for updates. | Some localized moderate to heavy snow bands are possible – especially late this afternoon into this evening. It is difficult to say exactly where and when these bands will set up, so stay tuned for updates. |
| We encourage you to allow extra time for the commute home and consider leaving either early or late. | We encourage you to allow extra time for the commute home and consider leaving either early or late. |