Sunday/Monday Storm Update as of Friday Evening

A mostly cloudy sky continues tonight through Saturday with temperatures above normal. Highs near 40 continues to melt snow.

Patchy drizzle or freezing drizzle is possible late Saturday night into Sunday morning. Temperatures are warm again reaching near 40 degrees in the afternoon with rain changes continuing through the day. Temperatures remain warm enough Sunday night as rain continues.

Temperatures warm into the upper 30s Monday with more rain in the morning. During the afternoon the wind increases from the northwest with temperatures start to drop into the low 30s changing light rain over to light snow. Light snow continues through the evening and tapers off shortly after midnight Monday night.

The map below shows where heavy snow (6″+) is most likely. Right now it is northwest of Charles City Sunday night into Monday. Any change in the track of the storm, that snow band will adjust as well. That means if it moves 50 to 100 miles southeast, so does that heavy snow. Stay updated on the forecast for any changes in the forecast.

Tuesday through Friday are dry with highs warming back to near 40 by the end of the week.

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Posted under Forecast Discussion, Update

This post was written by Schnack on January 19, 2018

Update on Sun/Mon Storm

The sky is mostly cloudy tonight and remains mostly cloudy through the weekend. Dry weather continues through Saturday with high temperatures in the upper 30s and low 40s. Friday is a breezy day with a south wind at 10-20 mph.

We continue to track a storm forecast to move across Iowa Sunday. The likely storm track brings us drizzle or freezing drizzle late Saturday night and early Sunday morning before temperatures warm above freezing. This happens as the sun rises Sunday morning. Rain chances continue through the day and most of the night.

High temperatures Monday are early in the morning and then fall into the 20s by the afternoon with a gusty northwest wind. Rain transitions to snow Monday morning and light snow is forecast to continue through the day before tapering off during the evening. Details on snow amounts and locations are not known yet since any wobble in the storm track will change the placement of the rain/snow and the amounts.

The yellow arrows on the maps show the likely path of the storm. The yellow lines show the possible shift either northwest or southeast of the track. The rain/snow on the map is based on the track with the yellow arrows. Any shift in that track will shift the rain/snow accordingly.

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Posted under Forecast Discussion, Update

This post was written by Schnack on January 18, 2018

Warmer and then possible storm

The sky is clear again tonight, but it is not as cold as last night. A breezy southwest wind continues through the night as low drop into the low teens.

Thursday and Friday are mostly sunny and warmer with highs near 40. Clouds increase Saturday as high temperatures warm to near 40 again.

We continue to track a storm forecast to move northeast across Iowa Sunday and Monday. The latest forecast track takes the low from southwest Iowa to northeast Iowa. The result is temperatures warm enough for rain Sunday and Sunday night in eastern Iowa. Late Sunday night into early Monday morning rain chances to snow. Light snow continues through Monday with light snow accumulations possible in eastern Iowa. Again keep in mind this forecast might adjust a few more times before Sunday gets here. Stay updated on the forecast.

The yellow arrows on the maps show the likely path of the storm. The yellow lines show the possible shift either northwest or southeast of the track. The rain/snow on the map is based on the track with the yellow arrows. Any shift in that track will shift the rain/snow accordingly.

Tuesday and Wednesday are dry with highs in the 20s.

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Posted under Forecast Discussion

This post was written by Schnack on January 17, 2018

Warm Temperatures then Possible Storm

We are heading into another night when temperatures drop below zero by morning. The wind is light so wind chills are not too much colder than the air temperatures.

The wind increases, Wednesday, from the southwest pushing temperatures into the low 20s during the afternoon under a mostly sunny sky. The breezy southwest wind continues into the night keeping temperatures from dropping any colder than 10 degrees.

Thursday through Saturday are dry with above normal temperatures each day.

We continue to track a storm forecast to bring rain/snow or just snow to eastern Iowa. The precipitation type and placement is dependent on the track of the storm. The yellow area is where the possible track of the storm will be. If the storm tracks the northwest side, eastern Iowa would have a rain/snow mix to snow. If it tracks on the southeast side of the yellow area it is all snow for eastern Iowa.  Early indications show the heavy snow would be across northwest Iowa and rain/snow in southeast Iowa. Stay updated on the forecast as this might change.

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Posted under Forecast Discussion

This post was written by Schnack on January 16, 2018

Cold Weekend Ahead with Accumulating Snow Late Sunday

A WIND CHILL ADVISORY is in effect for our northwestern counties through Saturday morning, as wind chills drop from -15° to -25°.  Elsewhere, they will be -10° or colder.

Saturday will be mostly sunny once again, but temperatures remain cold with highs from 6 to 15 degrees.

Sunday start out dry, with brief sunshine early.  As the day goes on, cloud will become thicker, and temperatures will warm into the teens, close to 20°.  This is as an Alberta Clipper tracks into the Midwest, and brings a quick hit of snow late Sunday afternoon into early Monday morning.  This will be a very fluffy snow, so it will be easy to shovel, and it will add up quick.  Generally, we will see one to three inches across eastern Iowa.

Northeast Iowa has the best potential to see three inches.  There could be locally higher amounts as well.  As always, this is a couple days out so this forecast could change.  Stay with KWWL for updates.  In the meantime, here’s the probabilities of one and two inches of snow across eastern Iowa from the Weather Prediction Center.

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Posted under Forecast Discussion, Temperatures, Winter Weather

This post was written by Kyle Kiel on January 12, 2018

Wintry Weather Thursday

Drizzle and dense fog this evening turns to light rain after midnight. Between 7-11 AM Thursday (from west to east) light rain transitions to a rain/sleet/snow mixture. Areas north and west of a line from Waterloo to Decorah will transition to snow early in the morning then late in the morning southeast of that line. Temperatures are in the mid-upper 30s around sunrise.

By noon temperatures are in the low teens and a strong northwest wind pushing wind chills to near zero.

Wind gusts are near 40 mph all afternoon and most of Thursday night. This will cause blowing snow where the snow fell.

Snow gradually tapers off in the afternoon from west to east. Snow accumulations range from 1-3” north and west of a line from Waterloo to Decorah. South and east of that line a trace to 1” of snow.

 

Friday and Saturday are dry and cold with highs in the teens.

Light snow develops in the afternoon Sunday and continues overnight. Snow tapers off Monday morning. A couple of inches of snow are possible. Monday is windy causing blowing snow with wind chills during the day below zero.

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Posted under Forecast Discussion, Winter Weather

This post was written by Rachael Peart on January 10, 2018

Snow Friday followed by dangerous cold this weekend. 

Tonight will be the “calm before the storm”. Dry weather tonight will come with a light wind as temperatures drop to near zero Friday morning.

A WINTER WEATHER ADVISORY is in effect Friday with snow likely most of the day. Snow begins between 7-10 AM and tapers off between 5-8 PM. The snow will be the powdery nature like it was on Thursday. Snow totals will range from 1-5”.

The wind increases from the north at 10-20 mph Friday causing blowing snow. Saturday morning lows range from 2-9 below zero with wind chills 20-35 below zero.

Saturday and Sunday are bitterly cold with highs near zero or colder. When you factor in the north and northwest wind at 10-20 mph the wind chills during the day will be 15-25 below zero. The coldest wind chills are in the morning. Those could be around 30 or 35 below zero. This is dangerous cold and wind so use caution this weekend.

New Years Eve is dry with temperatures from 5 below zero to 15 below zero (between 5 pm and midnight).

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Posted under Forecast Discussion, Winter Weather

This post was written by Schnack on December 28, 2017

Once Last Chance of Snow before Christmas

We had some light snow last night across parts of eastern Iowa. The heaviest band of snow was across southern Minnesota.

Waterloo reported 0.2″ of  snow last night. The latest measurable (0.1″) snow and latest 1″ of snow in Waterloo was on February 10, 1944.

A quiet night is ahead under a clear to partly cloudy sky. More clouds than sunshine are expected Saturday with colder temperatures. Speaking of colder temperatures…below normal temperatures are expected much of next week with highs in the teens and lows close to zero.

Light snow is possible south of Cedar Rapids Saturday night into Sunday morning with any accumulations of a trace to 1”. Flurries or a stray snow shower is possible north of Cedar Rapids. The map below shows light snow across southern Iowa early Sunday morning.

Monday through Wednesday is dry and colder than normal. We are tracking light snow possible for Thursday across eastern Iowa. The colder than normal temperatures are likely to continue through the first week of January.

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Posted under Forecast Discussion, Winter Weather

This post was written by Schnack on December 22, 2017

Wintry Weather Thursday

The first day of astronomical winter is going to bring a mix of wintry weather across eastern Iowa.  Tonight, our sky will be mostly cloudy with lows dropping into the lower and middle 20s with a southeast wind 5-10 mph.  Thursday morning, there is the potential for freezing drizzle across eastern Iowa.  Although we aren’t expecting heavy precipitation, as you know, it does not take much of a glaze to cause some problems on the roads and sidewalks.  You might want to allow a little extra time for your morning drive.

Throughout the day, moisture will increase, leading to a light wintry mix across eastern Iowa.  It may initially start off as rain south of HWY30, but as temperatures cool throughout the afternoon, freezing drizzle will transition to a light wintry mix, and eventually snow.

North of HWY 20, the transition to snow will happen sooner.  That’s where light accumulations, up to an inch, are possible.  Most locations south of HWY 20 will have a trace of snow, and a light glaze of ice.

 

The evening commute will be more impacted, especially across the south.  Behind this system, colder air begins to filter in.  A few lingering flurries or snow showers are possible Friday.

There is a slight chance for snow, especially across southern Iowa on Sunday, and then a couple more chances next week.  Still some uncertainty on how those systems will impact Iowa, so stay tuned for further updates.

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Posted under Forecast Discussion, Uncategorized, Winter Weather

This post was written by Kyle Kiel on December 20, 2017

Late Week Storm Update

We are still tracking the potential for a winter storm across the Midwest. The details on what type of precipitation, where and how much are still a bit “foggy”. We still have a few days for some forecast track adjustment. This is very typical for the forecast track to change from day to day. Small changes in the track will have big changes in the type, where and how much questions.

The map below shows the forecast track through Thursday morning. The low is in Montana Wednesday morning and moves southeast into eastern Colorado by the evening. It starts to turn east overnight and is in southern Kansas Thursday morning. It is then forecast to turn northeast. This is where it gets a bit “foggy”. There are different models we use for guidance and most of them put it somewhere across southeast Iowa, but exactly where…we will have to wait another 24-36 hours to be more confidence.

Here is a map showing the percent chance of snow accumulation. The best chance, for eastern Iowa, will be along the Iowa/Minnesota state line.

The storm is forecast to bring a wintry mix of rain, sleet and snow. Likely starting out as rain and transitioning to snow. Exactly how fast that happens and how much moisture is in the storm are some of the details yet to be determined.

Model guidance is updated several times a day and we expect some chances with each update. Typically the changes become less and less as the time of the event gets closer. With that said some of the models are showing around 1″ of snow for Waterloo by noon Friday. Now using that information and the map above…maybe a little more snow is possible north of Waterloo and less south of Waterloo. Keep in mind that is just one location in eastern Iowa. As we get closer to Thursday we will have a better handle on all the details.

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Posted under Forecast Discussion, Update, Winter Weather

This post was written by Schnack on December 18, 2017