01/16/2018

BLACK ICE: Sliding Car Slams Into Police Cruiser in KY...

A driver in Northern Kentucky found out the hard way that black ice is very dangerous. While traveling on River Road Monday morning, a compact car hit the ice, turned sideways and slammed into a police cruise! A dashboard camera recorded the collision. According to the Park Hills Police Department, the crash happened while officers were helping another driver who'd slid off the road. In this case, nobody was hurt, and nobody was charged.

Video Credit: GeoBeats News

 

 

-Rick DeLuca

Rick

https://www.facebook.com/RickDeLucaWeather

What Happened and How Much Snow Did We Get

Monday night/Tuesday might wind up being our big snow event of the season.  Places in central Kentucky saw nearly six inches of new snow fall. 

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While our forecast was not far off, we did get a bit more snow than expected.  The image below was our last forecast. 

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The issue was snow ratios.  On average one inch of liquid water roughly makes 10 inches of snow.  That is a 10:1 snow ratio, meaning ten inches of snow for every one inch of water. That's a broad generalization, but it's a good rule of thumb. 

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We were forecasting snow ratios from 10:1 to 20:1 before and during this snow event.  As the last band intensified late Monday, we saw snow ratios briefly of 40:1! That happens when the air above the surface is incredibly cold and is pretty rare, especially in this part of the country. 

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From this whole event, Louisville received 0.11" of liquid water.  This is measured by allowing the snow to melt. That equaled 3.4" of snow measured at the same location.  That's an average of 30:1-35:1 snow ratios, a much higher number than we normally forecast.  The other problem is forecast models don't handle snow ratios well.  They just assume 10:1 for the most part.  We knew it would be cold, so we went up to 20:1 when forecasting.  However, until the snow starts falling and you can start measuring its liquid equivalent, it's very tough to know what ratio you are dealing with. 

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-Hannah Strong

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Winter Storm Warning Issued For Louisville

From Jude Redfield...

    A winter storm warning has been issued for Louisville Metro. This runs until 1pm this afternoon. Travel will be difficult at times this morning.  The snow is tapering off from north to south so improvements are coming during the day. The afternoon commute should be much better than this morning. Storm total snow amounts for a few locations will end up between 3" - 6".

Temps

    This map below shows the additional snow expected today.

Specialgraphic

01/15/2018

WINTER STORM WARNING: Locations That Could See The Most Snow...

A clipper system will continue to bring light to moderate snow
to southern Indiana and central Kentucky through Tuesday.
Overnight through Tuesday morning, most areas can expect an
additional snow accumulation up to 2 inches. Where the better snow
bands set up and persist, 3 to 5 inches of snow with locally
higher amounts are expected. Bitter cold wind chills will also
impact southern Indiana and north central Kentucky on Tuesday
morning.

WINTER STORM WARNING IN EFFECT UNTIL 1 PM EST /NOON CST/
TUESDAY...

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  • WHAT...Moderate snow occurring. Plan on difficult travel
    conditions. Additional snow accumulations of up to two inches
    are expected.
  • WHEN...For the Winter Storm Warning, until 1 PM Tuesday
  • PRECAUTIONARY/PREPAREDNESS ACTIONS...

    A Winter Storm Warning for snow means severe winter weather
    conditions are occurring. If you must travel, keep an extra
    flashlight, food and water in your vehicle in case of an
    emergency.

 

 

 

-Rick DeLuca

Rick

https://www.facebook.com/RickDeLucaWeather

 

Wind Chill Advisory for Tuesday

The National Weather Service has issued a Wind Chill Advisory for several of our WDRB counties Tuesday morning.  This stretches through southern Indiana, but the cold will be widespread. 

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The Advisory is technically valid from midnight/1 AM to noon on Tuesday, but the coldest wind chills and temperatures will be around daybreak. 

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You should expect single digit temperatures with wind chills below zero all around our region. In fact wind chill values will be near -10 in many spots. Frostbite can occur in as little as 30 minutes on exposed skin with wind chills this cold. 

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-Hannah Strong

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NOWCAST: Snow Squalls and a Flash Freeze Tonight

Scattered snow will fall most of the evening, especially if you live south of Louisville.  We are watching a snow squall set up just west of our WDRB counties that will move through our area later tonight (it's circled on the map below).  Think of that snow squall like you would a thunderstorm - there will not be thunder or lightning.  There will be a heavier burst of snow and a stronger burst of wind with that squall, like what happens in a thunderstorm. 

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That snow squall is the first thing we will watch tonight.  The second is how quickly temperatures drop.  The AdvanceTrack image below shows us colder than 25ยบ by 7 or 8 PM.  That constitutes a flash freeze, where temperatures fall so far so fast water freezes instantly instead of gradually. The flash freeze is an issue because roads right now are wet.  Not icy, just wet.  When this flash freeze happens, all that water and wetness on the roads will turn to ice.

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Temperatures don't stop falling in the 20s, though. Your low temperature will be in the single digits; 6 is the forecast low for Louisville.  The salt mixture used by road crews stops working well below 8 degrees.  That's why the Tuesday morning commute could be a bit slick.  If we drop below 8 and the salt doesn't work when the temperature is that low, it can't treat the ice on roads.  Side streets and neighborhood roads will be worse, but even the more major roads could see some ice patches in this scenario. 

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Also note, snow is still falling south of the Kentucky Parkways by Tuesday morning.  That's why we're forecasting higher snow amounts to the south.  Marc and Rick will show you how much more snow falls tonight during WDRB News at 6, 10, and 11. 

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-Hannah Strong

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Nowcast: Second Batch of Snow Moves Through Kentuckiana

There are two rounds of snow for today. The first round brought a covering of snow for parts of the area, roughly 0.5''-1'' of snow. The official number for Louisville is 0.5''. That gives us 2.1'' for the season so far. But we have a second round moving through the rest of today! 

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And speaking of... there it is! It moved into our NW counties right on time, around 8 am, as the sun was rising. It will continue to progress to the south and east throughout the day today. 

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This is all associated with a clipper system. Round one was ushered in by a warm front. In fact, temps will continue to rise following the warm front. We will see temps around the freezing point today. But they will dramatically drop following a strong cold front that is chasing the warm front. The cold front is bringing in round two. 

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Advancetrack images are below. It does a pretty good job with the timing of the snow for the rest of today. Scroll through the images to get an idea of the rest of your day looks like.

Snow will arrive in metro late morning to early afternoon. 

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Snow will spread out through the entire viewing area during the rest of the afternoon. If you had to work today, the evening commute could be negatively impacted. Especially on those secondary roads. They may still not be cleared from this morning's snow. Use caution and take your time! 

Image 7

Snow will begin to end for the NW counties but continue everywhere else. 

Image 7

Snow will begin to wrap up for metro tonight, but lingering in our SE. 
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Some data suggests the front could get hung up in our SE counties. Even into tomorrow morning. If this happens there could be higher snow totals and the morning commute could be impacted more. Temps will be significantly colder by tomorrow. Temps will be in the single digits, some areas slipping below zero. Wind chills will be below zero and some spots could feel as low as -10 to -15 degrees. 

Image 7

There is a wind chill advisory in effect for several counties in southern Indiana due to the cold wind chills. 

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I think everyone in Kentuckiana is good for 1-2'' of snow when all is said and done. 


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However, due to the first round of snow we saw this morning, I think north of the river, as well as just to the south, there could be higher amounts. Some over 2''. If the front gets hung up in our southern counties, I think they could see some of the highest snow totals, potentially 2-3''. If the front moves out quicker, totals will be lower there, probably 1-2''. 

Image 2

Some roads may still be tricky, slick or snow covered tomorrow morning. Snow Fox will keep you posted on any of schools that may be closed or delayed. 

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Be sure to join Hannah this afternoon on WDRB News at 11:30-12:30 as snow will be arriving toward metro at that time. We will also be posting updates on social media until the end of the storm!  You can find me with the links below! 

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-Katie McGraw 

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01/14/2018

Winter Weather Advisory Issued for Tonight

As a clipper system moves just north of Kentuckiana, snow showers are likely to cause travel impacts Monday.  All our WDRB counties are under a Winter Weather Advisory beginning late tonight. 

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Please note that the timing of the Winter Weather Advisory is different all across the area. Here is a list of our WDRB counties by when their Winter Weather Advisory is active: 

Lawrence, Jackson, and Jennings (IN) - 10 PM Sunday to 4 PM Monday

Carroll (KY) - 1 AM to 7 PM Monday

Trimble (KY), Dubois, Jefferson, Orange, Washington, Scott (IN) - 1 AM to 4 PM Monday

Clark, Crawford, Floyd, Harrison, Perry (IN), Breckinridge, Bullitt, Grayson, Hardin, Hart, Henry, Jefferson, Larue, Meade, Nelson, Oldham, Spencer, Shelby (KY) - 10 AM to 10 PM Monday

Adair, Green, Marion, Taylor Washington (KY) - 1 PM Monday to 10 AM Tuesday

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Since this clipper is coming from the northwest, our snow chances begin in our northwestern counties around 1 AM Monday.  The snow starts light, but not all of you will see it beginning that early.

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As the cold front swings through Kentuckiana, the snow becomes more organized.  You see that, in the map above, happening during the middle of the day.  Flurries will be possible early, but the more moderate snow showers don't hit Louisville until early afternoon. 

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Southern and southeastern counties will see the snow hit later in the day Monday then it will be slower to clear out.  The map below shows there are still snow showers in the area by early Tuesday morning.  These Tuesday snow showers will be lighter as we start to lose the moisture behind the cold front. 

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From the snow coming overnight and during the first part of Monday morning, we could see roughly 0.5"-1.0" of additional snow.  That's likely to cause some travel impacts for the Monday morning commute.  Watch for icy patches and reduced visibility by morning.   The afternoon snow will likely bring another 1"-2" of snow.  The map below shows that higher snow totals are likely through central and southern Indiana. 

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I'll be explaining the forecast and the latest model data during WDRB News tonight at 10.  I'll also be LIVE on my Facebook page at 7 tonight to answer your questions about this snow chance and what it means for you.  Use the link below to follow my page and join the video at 7. 

 

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-Hannah Strong

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Back to Freezer: Bitter Temps Ahead!

Time to round up for our next chance for snow and COLD! And it is arriving soon... tomorrow! Many will be off from work or school for MLK Day, but lets discuss timing, totals and impacts in today's blog! 

SET UP:

A clipper system will bring a round of snow showers late tonight, through Monday and into early Tuesday morning, with a light snow accumulation expected. Snow will be followed up by very cold arctic air Tuesday, Wednesday and Thursday morning. 

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BRUTAL COLD:

This is a clipper system, but it will feature a warm front as well. So while temperatures have dropped dramatically since Friday morning, they will begin to increase slightly before the snow arrives. I think we will be around the freezing point by Monday afternoon.

Notice that when precip is moving through the area, temps will be right around freezing. This means there is a slight chance there could be a brief period when the precipitation type changes over to wintry mix. If that does happen, it would be a quick transition and a very small window, so any ice accumulation would be minimal. 

Image 6

Clipper systems are also known for their cold air rather than their snow totals. They are dragging cold, dry polar air with them. Compare that to the system from last week, that originated in the SW of the U.S. and met up with gulf moisture. 

Following the brief warm up, a cold front will sweep through and knock us back to single digits by Tuesday morning, with BRUTAL WIND CHILLS. Check out how cold it will be by Tuesday morning. Some data suggests wind chill values (the blue numbers) will not only be sub-zero, but wind chills will be ranging from -5 to -15 degrees! 
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Even by Tuesday afternoon, our wind chills look to be stuck below zero. The wind will begin to back off, but as our skies clear following the front, the coldest night will probably be Tuesday, into Wednesday morning. I have a low of 2 degrees right now in the forecast! Yipes! But the winds will not be as breezy. 
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MLK Snow Timing: 

A few initial snow showers are possible mainly in our northern and western counties, in S. IN late tonight or early tomorrow morning. They could impact the morning commute. They will last a couple of hours and then there will be another round that starts around daybreak. 

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More widespread snow will start around sunrise and move from our NW and push SE throughout the day, dropping a coating of snow for much of Kentuckiana. 

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By late morning, early afternoon, about half of our area looks to have the snow and metro will begin to see flakes. 

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Snow will continue to seep through the region during the afternoon and reach the KY Parkways. 
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The evening commute could be negatively impacted. Many are off for MLK Jr. Day, so there shouldn't be as many people on the roads, but keep in mind there could be delays. 

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The line of snow showers will continue to extend to the SE through the evening. 

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And wrap up by about 10-12 am. A few snow showers could linger in our SE. The entire event will last about 12 hours or so. Because flakes are flying until Tuesday evening and temps are getting so cold, there could be some impacts to Tuesday morning's drive. 

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Snow Totals:

I think all of Kentuckiana is good for .5'' to 1.5'' of snow. Some could certainly see more, especially in our northern counties where they will get an earlier, first dose. But* there is also a chance for higher totals in our SE counties, if* the line lingers in the early hours on Tuesday morning. It wouldn't be a lot more, around 2'' or so.  One computer model that shows that idea pretty well, is the NAM. 
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And for the curious bunch, here is the GFS and EURO. You can find the WDRB News snow total map on air this evening with Hannah! 

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We will be tweaking the details of the forecast as the clipper approaches Kentuckiana, over the next day. Be sure to join Hannah this evening on WDRB News at 10. I will also be filling for Jude on WDRB in the Morning tomorrow, as the first flakes start to fly and have an updated snow total map! Until then, we will posting updates on social media. You can find me with the links below! 

Katie McGraw's Facebook Page

Katie McGraw's Twitter Page

-Katie McGraw 

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01/13/2018

Several Snow Chances Cover MLK Jr. Weekend

Friday through Saturday Kentuckiana saw roughly 1"-5" of snow.  Click here to see reports from around the area.  A few flurries are still possible Saturday night with more organized snow chances arriving early Monday and again late in the day.  Keep in mind Monday is Martin Luther King Jr. Day, so many schools and businesses are planning to close regardless of weather. 

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The first round of light snow showers should begin in our western counties shortly after midnight.  This first batch will coat more of our northern counties.  If you live near E-town or south, you won't see much snow before the Monday morning drive. 

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Those snow bands will approach the Louisville metro shortly before dawn.  AdvanceTrak shows them arriving around 4 AM.  Though roads are well-treated and crews are planning for more work to keep roads clear Monday, watch for slick spots during the Monday morning commute. 

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These snow showers clear out by afternoon, and temperatures climb.  High temperatures are forecast in the middle 30s, so there is a chance the next batch of snow could start as rain briefly before switching over to snow.  If that does happen, it would be a quick transition so any ice accumulation would be minimal. 

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As the actual cold front moves through Kentuckiana, our second chance of snow showers moves in as well.  This comes later Monday afternoon, again starting in our western and northwestern counties. 

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By 7 or 8 PM, that snow approaches the metro. It will generally move east and southeast through the evening dropping light snow showers.  While this time frame is our best chance at additional accumulation, these will only be light snow showers. 

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That line of snow will move rather slowly through the area overnight leaving some question as to what condition roads will be in by Tuesday morning.  From all of these different snow chances, most of you will only pick up another one inch of snow.  North of the river, you could see closer to an additional two inches. 

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Any accumulations from the flurries Saturday will be minimal.  In fact, all additional accumulations will be on the low end, but together it will begin to add up.  Then we factor in that temperatures will allow for some of Friday's snow to melt but not all of it.  Remember to send us your snow updates and reports to we can pass those along! 

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-Hannah Strong

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