Wintry brew causes dangerously icy conditions in a DC segment Monday evening

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A winter continue advisory was in effect until 9 p.m. for a whole D.C. metro, northern suburbs and Baltimore. It does not embody Charles, Calvert or St. Mary’s counties.


9:45 p.m. update: Precipitation is pulling divided from a area, with some sleet still descending opposite southern Maryland, where temperatures have been closer to 40. Temperatures have warmed into a mid-and-upper 30s for many of a evident area and to a south. This is substantially about as amiable as temperatures get before descending behind off by a night.

Plan on ice if we are out and about. It competence not be everywhere, nonetheless you’re expected to confront some if we transport distant enough. A series of locations will continue to see dangerously sleazy conditions by a morning period. It is utterly cryptic that in some places many of a area will be treated, nonetheless a bend or side travel competence be an ice rink. Take it delayed and easy.

8:10 p.m. update: Not to be a damaged record, nonetheless a ice is utterly cryptic out there notwithstanding temperatures that have now warmed adult a small bit again opposite many of a area. For instance, National Airport is adult to a calm 37 during 8 p.m., a top heat of a day. Yet, ice is dangerous in many places.

The slight heat arise is not doing many given many of a segment was subsequent frozen for scarcely dual true weeks. It’s an peculiar box where ice is many prevalent right during a ground. Usually, trees and other towering objects will also accumulate ice. Here, not as much, solely in a north and west suburbs.

The bottom line is that ice is going to be a problem on untreated surfaces until a object comes out tomorrow and we start some legitimate warming (to a 40s!!). Slippery conditions are a bigger problem in and around D.C. and to a north than to a south, nonetheless they are probable customarily about anywhere, that means you’ve got to keep holding it delayed if we are out.

Precipitation is finale out west and it will do so in a Interstate-95 Corridor as well, substantially someday in a 9 to 10 p.m. time support or so. Even nonetheless a flood ends, winds are expected to stay light adequate to not assistance dry out surfaces much. At slightest sketchy ice will sojourn expected by morning, even in places to a south that have generally been wet, as temperatures cold into dawn.

7:10 p.m. update: There has been an uptick in reports of coldness opposite a evident area lately. It does seem that a detriment of illumination has helped a cold belligerent uncover off a bit some-more than it was earlier. Even in places with temperatures above freezing, we might run into intensely sleazy conditions, generally on steps, sidewalks, parking lots, driveways, and untreated side streets.

6:20 p.m. update: As a object dips over subsequent a horizon, temperatures have mostly depressed a grade or dual opposite a area over a final few hours. While many spots outward a northwest suburbs are nearby frozen to a few degrees above, some ice continues to form even in those places, generally where there has not been treatment. This is interjection to a unequivocally cold ground. At betterment to a northwest, it’s some-more widespread coldness that is ongoing. A identical story is expected opposite many of northern Maryland and a western suburbs.

The heaviest and many unchanging partial of this second turn of rejuvenated light flood is focusing over a southern half of a area, nonetheless we will continue to see rain, frozen rain, and sleet tumble areawide (at slightest during times) for a subsequent hour or two, before it some-more noticeably tapers off after this evening.

4:15 p.m. update: A wintry brew of sleet and frozen sleet continues in a northern suburbs, nonetheless things in a Beltway are sincerely still and demeanour like they will sojourn that approach by during slightest a initial partial of a dusk commute. In Montgomery, Frederick and Loudoun, side streets and untreated sidewalks are still icy and with temperatures commencement to dump as a object sets, we can design some-more rags of ice combining as a dusk wears on.

The heat downtown appearance during 35 degrees nonetheless is starting to dump now. Be wakeful of wet, untreated roads as we conduct out a door. Sidewalks are heavily pickled in a District, so your travel home should be ice-free.

3:30 p.m. update: The second call of flood is relocating into northern Montgomery County. Side streets and sidewalks are “messy and slippery” according to readers in Germantown and Gaithersburg. I-270 will substantially be fine by a generation of a dusk invert given it’s already treated and has so many cars on it. The good news is highway crews seem to be out en masse laying down salt to forestall ice from forming.

We’re gripping an eye on temperatures, that are in a mid-30s in a Beltway and hovering around a frozen symbol in a north and west suburbs. When a object goes down, we’ll see temperatures dump and wet, untreated surfaces will be some-more expected to freeze.

2:30 p.m. update: The wintry brew is steadily easing adult in a northwest suburbs and will exit a Beltway in a subsequent hour or two. There’s a second turn of flood that some models are presaging will come by between 6 and 9 p.m., nonetheless we’re not nonetheless saying justification of that on radar. In brief — be prepared for some more rain and wintry brew this evening, and we will continue to refurbish on a second call as it approaches (or fizzles).

That all being said, categorical roads demeanour good in terms of traction notwithstanding being bad in terms of traffic. We design a categorical treated roads to be fine by a dusk invert in a evident metro, with some sharp spots probable in north and distant west suburbs.

1:50 p.m. update: Temperature refurbish — still above frozen in a District , Arlington and southern suburbs, nonetheless it’s subsequent frozen north of a District. This includes Bethesda, Silver Spring and Rockville, where untreated roads are starting to turn slick. We’ve already seen reports of icy untreated roads in Rockville and points north.


Temperatures as of 1:50 p.m. (Weather Underground)

1:32 p.m. update: Freezing sleet is reliable in some of a north and west suburbs. I-270 is during risk for icy spots, nonetheless thankfully it’s treated. Untreated roads in Rockville adult to Germantown are apparently utterly icy.

1:20 p.m. update: There’s poignant sleet accumulation in a north and west suburbs, including what’s being reported in this print (below) from a Reston reader. This strange, icy, pellet-like flood is technically sleet. We’re examination temperatures and reports delicately for frozen rain, though, that is distant some-more dangerous for motorists given it can cloak a roads in a skinny covering of ice that is scarcely imperceptible.

1:05 p.m. update: Sleet reports are entrance in from North Bethesda, Falls Church and Arlington. Temperatures are a small above frozen in these regions, nonetheless we’re awaiting it to dump as flood falls. Treated roads seem to be fine for now, nonetheless untreated (and intermittently traveled) roads could turn slippery.

12:50 p.m. update: We’re examination temperatures delicately as flood inches toward a Beltway. North and northwest suburbs are still subsequent freezing, and will substantially sojourn that approach nonetheless many of a afternoon now that sleet is falling. Temperatures are adult to 33-36 degrees in a Beltway, that will primarily obviate icy accumulation, nonetheless it will get colder as a sleet and/or sleet falls.


Temperatures during 12:50 p.m. (Weather Underground)

12:00 p.m. update: Sleet is descending in a distant northern suburbs, including Frederick, Gaithersburg, Germantown and Leesburg. Sleet and frozen sleet is relocating into a Baltimore area from west to east, cloaking a untreated surfaces with ice. As a hours pass, a sleet and sleet will climb over south toward a Beltway. Temperatures could drop, making it some-more expected for ice to arise on untreated roads.

The Monday evening rush could be dangerous as a wintry brew skirts through a D.C. segment customarily as commuters conduct out a door, generally in a northern suburbs.

Snow is not unequivocally going to be a emanate tonight — a regard will be a possibility of icy roads due to sleet and frozen rain. Temperatures seem expected to arise above a frozen symbol this afternoon, that would obviate icy accumulation. However, as a flood falls, it will cold a air, that could drag a heat behind down subsequent freezing. That in multiple with unequivocally cold roads (thanks to a new enlarged cold snap) suggests untreated surfaces could turn slick.

In many ways, this supposed wintry brew can be some-more dangerous than snow. Be prepared for icy roads — utterly side streets — and sidewalks. Allow additional time for a commute.

Timing: Monday from 3 p.m. to 7 p.m.

Hazard: Light frozen rain, sleet and snow

Impacts: Icy glitter on untreated surfaces, including roads, sidewalks, driveways and parking lots

Confidence: Medium

Forecast details

The categorical doubt in this foresee is a temperature. If it stays above frozen by a generation of a event, there will not be dangerous accumulation. If it drops subsequent frozen afterwards ice could start to arise on a roads. The foresee is right around 32 degrees, so it could go possibly way.

These are a few reasons we are endangered about ice this evening:

1) The atmosphere will primarily be dry. So any sleet descending by it will evaporate, that will cold a air. Even if a heat gets adult above frozen this afternoon, it could dump fast once a flood arrives.

2) Arctic atmosphere mostly binds on a small longer than forecast, and we are customarily only entrance out of a enlarged cold snap. In these situations, a coldest indication foresee customarily ends adult being closest to existence unless clever aspect winds are present. The high-resolution NAM indication suggests, notwithstanding a miss of a high vigour complement to a north to foster cold atmosphere damming, temperatures will stay during or subsequent frozen for many areas north and west of a city.


NAM heat foresee for 4 p.m.

The NAM also indicates temperatures will tumble behind to frozen even around a Capital Beltway once a flood starts. The NAM is presaging below-freezing temperatures as distant south as a District. By 7 p.m., the indication drops a heat to 33 degrees as distant south as Waldorf and Dale City.

Other models forecasts are a small bit warmer — particularly a GFS, that keeps the District at 35 degrees during 4 p.m. With light winds being forecast, it is tough to order out a NAM’s colder, icier prediction.

3) The belligerent and untreated surfaces are expected to sojourn good subsequent frozen given of a impassioned cold of a past integrate of weeks. If that is a case, sleet would solidify on contact, even if a atmosphere is warmer than 32 degrees. For that reason, even folks vital in areas where a heat rises a small above frozen south and easterly of a city should not let down their ensure and should guard highway conditions.

The flood should transparent out from west to easterly nonetheless could dawdle opposite a eastern areas into a dusk hours. Precipitation will be over good before tomorrow morning, but temperatures will dump subsequent freezing again tonight, that raises a intensity for icy rags in a morning commute.

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