Monday Winter Storm Update: Road conditions and updated forecast
Here is the latest update on Monday's Winter weather, including road conditions across the region and expected impacts
For a list of school delays and closing, go to NC1.tv/closings
- As of 4:23 this morning, snow bands are moving across the region – bringing slick and snow covered roads and hazardous travel to portions of our region.
- These snow bands will continue through the morning hours and bring additional accumulations.
- Breezy conditions could bring areas of patchy blowing snow, especially as you head out towards the South Dakota or Wyoming plains.
- Snow will eventually decrease by this afternoon and evening – leaving only far Southern portions of our area with impactful snow bands.
- Snow covered roads exist across areas of Custer County, stretching North through Pennington and Lawrence County.
- The I-90 corridor from New Underwood stretching all the way to Billings, MT can expect snow covered roads and breezy conditions.
- SD-79, as if this morning, remains relatively clear as you head South from Hermosa but that could change very quickly through the 5 and 6 am hour.
- WYDOT shows high impact road conditions along I-90 from the SD state line to Sheridan, WY.
- Patchy blowing and drifting snow could lower visibility and cause travel hazards, use caution.
Here’s a look at some road conditions across the region this morning
Forecast guidance has changed little over the last 24 hours, so have left original forecast from Sunday posted below. This will have expected accumulations and timeline for our snow event and warnings/advisories. Stick with Newscenter1 for the latest!
For a list of school delays and closing, go to NC1.tv/closings
- As far as most of Sunday is concerned for Rapid City and the Black Hills, mostly sunny and relatively mild conditions are expected.
- Temperatures will start to drop this afternoon with the approaching cold front, from the 40s to the 30s and eventually 20s by tomorrow morning.
THE NATIONAL WEATHER SERVICE IN RAPID CITY AND BILLINGS, MT HAS ISSUED WINTER WEATHER ADVISORIES AND WINTER STORM WARNINGS FOR THE BLACK HILLS REGION AND NORTHEASTERN WYOMING.
- Rapid City, Hermosa, and areas of Custer County are in a winter weather advisory.
- The advisory calls for higher accumulations towards Custer, SD and the higher elevations.
- Patchy blowing and drifting snow will be possible, particularly as you leave the safety of the Black Hills.
- the Wyoming plains in Crook County and the I-90 corridor between Spearfish and Rapid City are also in a winter weather advisory for 3″-6″ of snow.
- the I-90 corridor could see several areas above 6″ of snow due to upslope enhancement.
- Patchy blowing and drifting snow could pose an issue as well.
- The higher elevations of the Black Hills in Pennington, Lawrence, Weston and Crook County are under winter storm warning for 6″-10″ of snow.
- As usual, locally higher amounts could be possible.
- Most of Northeastern Wyoming will be under a winter storm warning.
- The warning calls for 6″-12″ of snow as you approach the Big Horns, and a little bit less at 5″-10″ for areas of Campbell and Weston County.
- The timeline calls for Snow to start moving in the late afternoon towards Sheridan County Wyoming.
- Areas of South Dakota should remain dry until later on this evening.
- By 5-7 PM, snow coverage will start moving North to South across the area, skipping areas of Harding, Perkins, and Carter County, Montana.
- Some areas of the SD plains could see a mix between rain, snow and sleet before a full transition to snow.
- By 9 PM, coverage is widespread and most areas are seeing light to moderate snow bands passing through in waves.
- Notice the dry pocket towards Weston and fall river County – this “snow shadow” will reduce accumulations for places like Edgemont, Hot Springs and Oelrichs.
- Temperatures overnight into Monday will plummet, with single digits likely for the higher elevations and teens/twenties likely everywhere else.
- Northeasterly Winds along the Eastern Foothills will make things feel much colder – bundle up Monday morning.
- Snow will continue all the way through Monday morning – snow accumulations will continue to increase across the Black Hills and Northeastern Wyoming.
- The I-90 corridor and areas East of Rapid City could experience patchy blowing and drifting snow for Monday morning commute – plan accordingly.
- By rush hour Monday evening, conditions will begin to improve for some areas but snow will continue to strafe the region.
- Heavier snow bands could still move through areas of Oglala Lakota, Jackson and Bennett county through Monday evening.
- Real, tangible improvements will be seen by early Tuesday morning, with only a few areas of snow hanging on in the far Southeastern portions of our area.
- Temperatures will be chilly, in the teens and 20s with wind chills approaching zero – bundle up!
- Accumulations are obviously more complicated than what a map can show, but so far most of the higher concentrations are around the Big Horn Mountains and the Northern/Eastern foothills of the Black Hills.
- A distinct “snow shadow” will be likely somewhere between the Western Foothills of the Black Hills Stretching Southeast towards Edgemont and Hot Springs – accumulations of 2″-4″ or less look likely. This is due to downsloping NE winds… a slight wind change could alter this zone of inactivity.
- The complete opposite will be true for the I-90 corridor between about Beulah, WY and Rapid city, where NE winds will provide upslope enhancement.
- Areas like Sturgis, Piedmont, Summerset, and Spearfish could see locally higher amounts greater than 6″ – Snow accumulations will be determined by which side of the street you live on.
- The SD plains can generally expect 2″-4″ of snow, Save for Box Elder which could see some gusty winds and blowing snow – resulting in 3″-6″ of snow.
- Oglala Lakota, Jackson and Bennett counties could see a little more than 2″-4″ of snow – depends on how long stubborn snow bands stick around going into Monday evening.
- Hot Springs, to me at least, is the big question mark. the farther north you head out of town, the more likely you are to see accumulations greater than 2″-4″… the farther west and you’ll likely see 1″-3″ or perhaps even less. Stay alert.
- NE Wyoming in general will be a breezy, snowy mess. Travel along I-90 could be difficult… if not impossible at times. Check road conditions before you head out the door. 6″+ of snow will be likely across the entire WY territory save for Newcastle. That enough should give pause if you have travel plans.
- There are some indications that areas between Sturgis and Blackhawk could see much more than 6″ of snow…. and I have reason to believe this isn’t out of the realm of possibility.
- Northeasterly winds will lead to upslope enhancement – and tend to overachieve snow accumulation forecasts with large, fluffy snowflakes within individual snow bands.
- Send in your snow amounts as this event takes place! That way we can warn travelers of possible areas of trouble as we approach early Monday morning…
- Things improve Tuesday, but temperatures will still be on the chilly side with winds gusting out of the North.
- Another system is expected to move through Wednesday night through Thursday.
This system changed identities through the week – from a classic Northwesterly Clipper to a slight Southwesterly… almost southerly based Colorado Low system. This places the Black Hills in the crucial Northwestern Deformation zone of our approaching Low pressure system. It’s somewhere in-between at this point as Northeasterly winds will cause a few problems for the Northern and Eastern foothills, but not as much as a full blown weather system like our Thanksgiving storm – its missing a few key ingredients.
That being said, this is a system to take seriously – particularly if you are travelling through Wyoming for the Black Hills Stock show along I-90. Although Rapid City is only expecting moderate accumulations – the I-90 corridor north of town could see some decent snow bands through Monday morning… complicating travel.
Keep an eye on the forecast, and have a way to receive up to date information. The good news is high winds aren’t expected to be as big of an issue, but breezy conditions… gusts up to 30 MPH could happen. This could lead to blowing and drifting snow, reducing visibility. There will be more updates with this before all is said and done, and we’ll be sure to provide you with updated road conditions and the exact situation early Monday morning. Stay tuned to Newscenter1, and once again thank you for trusting us with your forecast. Be safe out there! -Brant