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Severe Weather Risks Continue

Good Thursday morning bloggers,

As severe weather season hangs onto its last breath it is making some loud noise.  There is one more storm system that is far enough south to bring us a threat of some severe thunderstorm activity on Friday.  Look below at the risks for day 1 and day 2 as issued by the Storm Prediction Center:

A weakening cold front will slowly move across the Kansas City viewing area Friday.  A line of scattered thunderstorms will likely form tomorrow afternoon and we will be in the right rear quadrant of an exiting storm and jet stream.  The more serious threat of severe thunderstorms will very likely be well off to out east-northeast Friday, but we must watch the western edge of this threat closely.  It will heat up ahead of the the weakening cold front/wind shift line on Friday.  The dewpoints will likely be in the lower 70s near the frontal zone and thunderstorms will form Friday afternoon right near the wind shift line.  The more signficant severe weather threat will more likely be over Illinois and Indiana on Friday ahead of the main upper level storm system.

Summer begins on Sunday.  I know I talked about June 15th being the rough end to our severe weather season and the threats should shift north and fade in the coming days and weeks.  But, after an almost non-existent severe weather season it seems to want to leave us with a reminder that we actually do live in tornado alley.  Yesterday, there was one supercell thunderstorm that tracked across extreme northeast Kansas to just south of St. Joseph and east southeast to near Columbia, MO.  As it moved across Norborne, MO nearly 100 mph winds blasted through that town causing some significant damage. There were no injuries again, and even though we have had two damaging severe thunderstorm events this week, no one was hurt which is great news.  There were no tornadoes this week in our viewing area which is rather amazing, but farther north yesterday there were tornadoes, a few rather significant.  So, let's get through the next two days and the threat of severe weather will finally fade away. 

What will this years summer pattern bring? The weather pattern continues to cycle according to this years LRC and it is going to be interesting to see how it plays with summertime.  As much as we anaylze the LRC it is still extremely difficult to forecast its affect on our summer weather.  If we get any strong feelings on what it appears this years pattern will mean for July, then you know we will share it with you.

Have a great day!  I am going to Portland, OR for the  AMS (American Meteorological Society) Broadcast Conference next week.  I am going to try to take the next two days off, but if severe weather threatens, then I will come in to help Jeremy who will be filling in for me.

Gary

Published Thursday, June 18, 2009 6:54 AM by glezak

Comments

 

weatherwunder said:

Good morning, Gary,  where are all the bloggers?  Thought I'd better let you know someone is checking the weather blog!  Actually, I don't think you ever need to be concerned about that, and I do check it frequently during every day.

Thank you again and again for all you do, and may you have a good meeting in Portland.  Needless to say, we will be glad for your return.

Edna
June 18, 2009 8:05 AM
 

norborne mo | Latest Information said:

June 18, 2009 8:24 AM
 

sportsfreaked said:

GARY.... You know that when ever you are going to leave town that we have a weather event very close to if not in the KC metro. If I were you I would leave clothes out for Friday when you have to come in to 41 for severe weather coverage......Have a safe and fun trip!! ED
June 18, 2009 8:32 AM
 

ChicagoExPat said:

Gary said: "So, let's get through the next two days and the threat of severe weather will finally fade away. "

YES -- and good riddance! You know, last week, I was considering making a trip up to Chicago to visit friends and family this week. I haven't been back for two years, and I figured I would dodge some of the last severe weather threats in Kansas, but looking at those maps, I'm glad I stayed in Kansas. I sure wouldn't want to be driving home in any of that.

Tina
June 18, 2009 8:50 AM
 

FlakeFan said:

Seems like if this "bubble" apears in August it would be a major heat wave. I hope this is as far north as it gets because yesterday in Salina it already got to the 100's.
June 18, 2009 9:28 AM
 

Mammatus said:

Looks like the latest nam has Fridays system slowing down a bit.
June 18, 2009 9:36 AM
 

Craig said:

LLTI !!!!!!!!
The weather's about to get exciting!
June 18, 2009 9:46 AM
 

NewToKC said:

Pardon my ignorance on Great Plains meteorology, but what's generating this gusty wind we've had for the past two days?
June 18, 2009 10:08 AM
 

bewild79 said:

Hey,
What is the difference between 100 mph winds and 100 mph straight line winds?  Sorry if this is a stupid question...
becky
June 18, 2009 10:11 AM
 

luvsnow said:

Happy to hear you are still in town at least tomorrow, we don't need the LLTI with the severe weather risk!
June 18, 2009 10:23 AM
 

RDub said:

Becky, no difference. "straight line" is just added to clarify that the winds weren't from a tornado.
June 18, 2009 10:33 AM
 

bewild79 said:

Thanks Rdub!!
Becky
June 18, 2009 10:46 AM
 

marlina10 said:

Will we continue to see high humidity through the weekend?
June 18, 2009 11:06 AM
 

FairSkys said:

Say, I keep hearing / seeing the term convective temp. - how or where is that figured?  Today on the hazardous outlook they mentioned if that was reached, we could have some storms.  So I wondered how they figure what the temp would need to be.
Thanks
June 18, 2009 11:29 AM
 

bewild79 said:

Am I right if I say that the convective temp is the temp when the cap breaks?  Please correct me if I am wrong...
becky
June 18, 2009 11:36 AM
 

Mammatus said:

Becky and fair skys, Convective temp is the temperature needed to break the cap. Right now, per Topeka's soundings, the convective temp is 101. The convective temp will drop as the day progresses as the cap will start to thin out. Essentially, the surface temperature needs to warm to the convective temp to create rising motion and allow clouds to develop and rise vertically into the atmosphere. Here is a link to explain it better than I can ;-)
http://www.theweatherprediction.com/habyhints/257/
June 18, 2009 11:45 AM
 

Mammatus said:

The link is a bit technical but essentially, the stronger the cap, the higher the convective temp needs to be in order to break it. The cap will be very strong today so I would say the chance is very slim. The only chance is if the outflow boundary the Nws mentioned helps fire off a storm.
June 18, 2009 11:50 AM
 

Aussie83 said:

Thanks for your good info Mammatus. By the way what does it mean when you said earlier that the system is slowing down a bit? Does that mean it would arrive later on?
June 18, 2009 11:53 AM
 

Mammatus said:

You can find out what the convective temp is by looking at a skew-T log such as Topekas to see what it is. Its a bit complicated if you have never looked at one. Here is that link, click on the skew T chart and click the star on one of the maps that would be Topeka, it should say TOP at the top of the Skew-T chart after you click the star. The current obs are for 7am this morning(1200z), they will have another around 1900z(2pm)
http://www.spc.noaa.gov/exper/soundings/
June 18, 2009 11:53 AM
 

Mammatus said:

Aussie83, no problem. If the upper level storm and front slow down a bit, we would have a better chance of severe weather Friday  afternoon because it would arrive later like you said. We should be on the western edge but if the weather models stay on track with slowing it down, we could have a higher chance of storms. Also, if storms in the morning up in Iowa or Nebraska are strong, they could help push the front south more quickly lessening the chance for the immediate K.C metro.
June 18, 2009 11:58 AM
 

Aussie83 said:

Thanks, that makes a lot of sense!
June 18, 2009 12:03 PM
 

Andrew_Stafford said:

So for the cap to break in TOP it needs to be 101F ? http://www.spc.noaa.gov/exper/soundings/09061812_OBS/
June 18, 2009 12:19 PM
 

RDub said:

Andrew, yep, that's what it says...which is why the chance of rain today is so low, despite the warmth and abundant moisture.
June 18, 2009 12:31 PM
 

Mammatus said:

Yeah, thats pretty high but it was at 1200z. I doubt we will break the cap today. Guess we will wait and see what it says at 2pm. Im guessing the convective temp will be around 97 degrees this afternoon.
June 18, 2009 12:31 PM
 

bewild79 said:

Wow....uummm...yea....I don't think I understand how to read that thing...lol
June 18, 2009 12:34 PM
 

marlina10 said:

We are trying to decide if we want to spend the day on bike trails on Saturday. Will the high humidity continue through the weekend? That would be the deal breaker that would keep us inside.
June 18, 2009 1:06 PM
 

Amos said:

I must say that when at the lake a couple years ago, I saw some of the most amazing storms  on a day when it was 103 degrees. That won't happen today... definitely.

I wonder if the SPC will issue a high risk tomorrow towards the NE? It would only be the 2nd time this year.

June 18, 2009 1:06 PM
 

subby64735 said:

BEWILD79:  To find the convective temp, just ignore the graphs and look at the first box of number below the graphs.  You will see "convt = 101"  That is where you can quickly find the convective temp.  Hope this helps, Jim in Clinton.
June 18, 2009 1:15 PM
 

bewild79 said:

Jim,
yes it did, thanks...that all looked so confusing to me lol
becky
June 18, 2009 1:24 PM
 

Lizbaugh said:

I am headed to Chicago for the weekend. I see that they are in the Moderate Risk area. Is there a timeline?? I am now worried my flight will not make it there due to the storms. Any thoughts?
June 18, 2009 1:25 PM
 

Amos said:

SPC had an accident with their probabilities; they show the categorical of today, but have the risks of yesterday.
June 18, 2009 1:27 PM
 

Mammatus said:

Sorry Bewild :-) They are complicated and I should have mentioned to look at the chart. On a side note, the spc edged the Moderate risk a tiny bit west. We will see if the 00z model runs still lean towards the front slowing down.
June 18, 2009 1:33 PM
 

ChicagoExPat said:

LIz, you might try checking out one of the local weather stations in Chicago. Here is the WGN weather center site: http://www.wgntv.com/weather/

If your flight is early enough in the day, you might miss landing in the storm or having a delayed flight. Have a great time!!  

Tina
June 18, 2009 1:35 PM
 

Lizbaugh said:

Thanks Tina!!

Our flight lands at like 5:30pm... I am hoping it will hold off!! The NOAA website is saying 60% chance of Severe Storms in Chicago tomorrow and 70% tomorrow night.  We'll see what happens! I want to make sure that people know that this is CHICAGO weather and not KC.

Thanks for the link!!'

Liz
June 18, 2009 1:44 PM
 

FairSkys said:

Mammatus & subby64735 thank you so much for the info, that really helped!  I just got back from lunch, and I swear I could bake a cake in my car it's so hot out there.
Thanks again everyone
June 18, 2009 1:45 PM
 

khansen said:

Is it just me or does anyone else think this chaser got WAY too close yesterday?

http://www.cnn.com/video/#/video/us/2009/06/18/vo.huge.tornado.cnn
June 18, 2009 1:47 PM
 

bewild79 said:

Here in Parkville, it is up to 95.2 with DP of 73 and heat index of 105.....holy cow!  What....are we in Louisiana....? lol
becky
June 18, 2009 2:02 PM
 

RDub said:

Lizbaugh, you should take those forecasts with a huge grain of salt. It's really hard to predict when the storms would be in/near Chicago, whether they'll be actually at your airport or not, etc.

Of course, O'hare only needs a puffy cloud and a gust of wind to delay flights. If you're going into Midway you have a much better chance of being on time.
June 18, 2009 2:06 PM
 

bewild79 said:

SPC has the moderate risk on our doorstep to the east for tomorrow but we are still in the 30% bubble....good day for pics??
becky
June 18, 2009 2:15 PM
 

Mammatus said:

Becky, it may indeed end up being a good day to take pics tomorrow. We are right on the edge.
Steve
June 18, 2009 2:23 PM
 

bewild79 said:

Steve,
haven't had that many opportunities to take good pics this year.  I had a lot last year....most of the pics I have are from storms that were a good distance away from me....
becky
June 18, 2009 2:36 PM
 

lillis said:

khansen, I saw that tornado video, wild, he kept driving closer even after he said 'im wayyy too close..eeeek!
'
June 18, 2009 2:56 PM
 

Mammatus said:

Becky, sometimes the far away pics are the coolest. Especially when the sun is setting. I think they will be pretty close tomorrow if not, right on top of us. This may be our last shot until the end of summer when the weather pattern changes again.
June 18, 2009 2:56 PM
 

Craig said:

Wow, Hansen, thanks for the link.
That idiot did not seem to possess the proper respect for that storm. Nebraskans should be quite relieved that the storm stayed in rural areas. It was a monster.
June 18, 2009 2:58 PM
 

bewild79 said:

Steve,
I have one that I took in my back yard earlier this season when the tornado was in Chillicothe...it took a lot to get the pic...I have so many trees in my back yard that I had to go to the back of the acre, stand on a step stool, and on my tippy toes, and raise my arms high enough (yea I know that is a lot for a pic) but ya know what?  It was one of the best I have ever taken.  It had the sun while setting reflecting pink off of the top...it was GREAT!!
becky
June 18, 2009 3:08 PM
 

restull said:

Hey everyone, here is something I found on the Wichita NWS site about last night's heat burst from collapsing thunderstorms in central Kansas. It was amazing just to experience the intense heat right after the winds diminished!
June 18, 2009 3:18 PM
 

restull said:

June 18, 2009 3:27 PM
 

Mammatus said:

Very cool Becky. I have jumped thru hoops myself to get good shots  of storms as I am a freelance Photographer and take every opportunity to get good shots of Severe storms. I stormchase for that very reason as well as the fact that I am fascinated by storms.
I'm not looking forward to the dog days of summer although I have taken a few pics of summertime T-storms that were quite impressive. I hope you are able to get some good pics tomorrow. I am in the process of creating a website for severe weather photos. I would love to see some of your pic's sometime. I might post some of mine on flickr when I get a chance.
June 18, 2009 3:30 PM
 

bewild79 said:

Steve,
Let me know when the web site is ready and where to go and I would be glad to put some of them on there. :)
becky
June 18, 2009 3:43 PM
 

Zazel said:

I once experienced a heat burst while working as a conductor on the BNSF railroad.  We had stopped on a siding, as is far too common for trains, and I stepped outside to stretch.  It was shortly after midnight and the wind was blowing like it hadn't been blowing all night.  The temperature must have been in the mid-90s, despite it being in the low 80s when I had started the night a few hours earlier.  Fun stuff, but not nearly as fun as a solid thunderstorm.  Maybe tomorrow will pan out.  I think I'll start holding my breath right now!
June 18, 2009 3:53 PM
 

JFTtown said:

As long as those thunderstorms don't "pan out" and "wash out" game one of the I-70 series tomorrow night.  Zazel, you hold your breath until the thunderstorms begin, then I will hold my breath until they end (hopefully by 7:10 pm Friday).  May neither of our faces turn blue.
June 18, 2009 4:08 PM
 

addiwethergrl said:

If the temperature has to be 102 degrees then maybe we won`t get the storms. I hope it doesn`t  get that hot though.  iwant to go swimming without catching my swimming suit on fire!!! lol !!!
June 18, 2009 4:33 PM
 

mgsports said:

Last Night Greg Forbes Severe Weather Expert at the Weather Channel said Long Lived Supercell Tornado's for Friday and there may includes KC area.
An updated overnight for Risk will give a better idea.
June 18, 2009 4:36 PM
 

lillis said:

severe thunderstorm watch for SW/central Kansas, storms firing up!
June 18, 2009 4:38 PM
 

whirlygirl said:

Am I missing something or is something getting misunderstood? The convective temp has to be 102 for the cap to break, NOT the temps on the ground. If we only got severe when KC hit 102 degrees we would never have any weather.
Msgsports, we never listen to TWC. it just gets persons too worried about something that likely won't happen.
June 18, 2009 5:34 PM
 

Amos said:

If the temperature was 102, the CAP would be rendered useless in the halt of storm formation. If it did hit 102 today, storms would likely fire due to our humidity, but just because you reach convective temp does not mean storms will form.
June 18, 2009 5:55 PM
 

bewild79 said:

whirlygirl,
we were talking earlier trying to find out what temp it needed to be outside today for the cap to break.  101 or 102 I dont remember but that was the temp it needed for that to happen and since that was not likely today, that is why we didnt see any storms.
becky
June 18, 2009 6:00 PM
 

Luthur said:

"Last Night Greg Forbes Severe Weather Expert at the Weather Channel said Long Lived Supercell Tornado's for Friday and there may includes KC area. "

Ratings!  More ad money in saying Kansas City rather than Jefferson City.

/I just ensured we are getting clobbered tomorrow.
//I dislike TWC, but I really like Greg Forbes.  He is sort of like Gary in which he will explain his reasoning behind what he thinks is going to happen.
June 18, 2009 7:31 PM
 

kcwxguy said:

A note about convective temperatures.  Like any individual attribute describing the atmosphere and its potential, one component alone is not enough to make a prediction or even have a solid indication of storm initiation.  There are many components that are needed.

As it relates specific to convective temperature, there are several attributes that go into this parameter including surface heating, low level moisture and any type of warm air advection that is present.  

When we think about cap, Gary explained it very well a few weeks back in laymen terms, but when getting into specific parameters to see what may happen, it invites the more technical side of the relationships involved in how cap is viewed and how it can be overcome.

Without getting to techy, cap can be forecasted by generally looking at the 700mb temperatures aloft.  In general, if it exceeds 10C, there is a solid cap.  However, the devil is in the details.  Much like last night, the 700mb temps were above 10C when the supercell developed, but was able to overcome it with other parameters such as convective temperature.  

Yesterday had wicked low level moisture and very strong surface heating.  In addition, we had a lifting warm front [active warm air advection] aiding in lift.  These three things aided the development of the supercell.  An additional feature needed in initiation is some sort of convergence or forcing.

If you look back at the loop yesterday, that cell formed on a boundary seen via satellite images.  This boundary was not at the surface as it was not seen in the METAR [surface observations] readings.

So, convective temps alone did not initiate the supercell, rather eliminated a factor of cap reducing factors preventing development.  It still needed something to fire it off.

So, while the cap is generally predicted by the 10C 700mb isotherm, convective temperature really relates to what is called CINH.  CINH is another parameter shown on the skew-T diagrams.  CINH is simply convective inhibition.  Should you want more info on how CINH is measure and its components, here is a good link.

http://www.theweatherprediction.com/habyhints/306/

CINH and the rule of thumb of the 700mb temps are the common pieces to understand cap, but as seen last night, there are situations where cap can be overcome...but still requires the standard attributes for storm initiation.

Hope this helps in understanding.
June 18, 2009 8:10 PM
 

Kumke Weather said:

Gary,

I liked how you removed my message last night. And then I come and read the Heart burst. And there is another Made up user name which is Interpropertate named suckmy****. So, With these Mixed signals being thrown out. I dont really know what this is. Maybe u should ban him or make him change his name.

It wasnt really a Personal Attack yesterday. It was a voice of reason. Someone had to say enough is enough and i did that.

********************

We all regulate the blog and it is possible that I removed your comment.  We are trying to keep things under control.  But like most blogs there is a handful of people that want to stir things up.  We'd rather not, but soon we'll have to block IP addresses of those that can't stay within the rules of the blog.

Jeremy

June 18, 2009 8:21 PM
 

juba said:

My backyard is still flooded, when will it dry out?  So many TREES are starting to wilt from all the water.
June 18, 2009 8:31 PM
 

kcwxguy said:

I think Gary nailed the analysis for tomorrow.  The jet streak location will enhance lift along the frontal zone and many pieces of the puzzle are there...however, this is a different animal from what we have seen in the last week or so.  This is an actual cold front derived boundary.

We will have a surface convergence.  We will have instability.  Cap will erode ahead of the frontal boundary allowing initiation.  There are a few things to consider in watching this...

First, low level helocity is marginal.  The directional aspect of the surface winds do not bring a great deal of low level turning.  As storms first form, certainly there is a potential for supercells, but it will quickly go linear along the boundary.

The aspect I am watching carefully is the upper level vorticity in the southern stream.  Not the vort that comes across Nebraska moving NE, but the one that comes out of TX.  It is progged to generally shear out as it moves NE into Eastern KS, but the resolution of this vorticity is still rather course to know for sure what happens.  

If it comes out a bit stronger, it could bring an upper level burst ahead of the frontal zone around 21-0Z.  The models I have looked at ALL show the vorticity shearing out before it really gets here, but temp profiles show a possibility of the 500mb temp core still in tact.

Also, if it holds together, it may create a bit of troughing into the frontal boundary with a secondary, yet smaller surface low forming.  If this happens, we will be on the NE side of the surface low along a secondary trough ahead of the frontal boundary bringing a scenerio of having a possible windshift pre frontal creating a pseudo triple point.

This will have to be watched as it could enhance the convective nature in our area along and just ahead of the frontal boundary.  

One other factor to watch...if initiation does occur in SE Nebraska earlier in the day, depending on how strong it is or if it happens at all, it could throw an outflow boundary into our area.  That along may be enough to initiate ahead of the frontal boundary and bring more spin into the discrete mode.

In general, the environment suggests a linear storm mode on the cold front bringing rain and maybe some wind/hail...but the smaller features could make a difference just ahead of the frontal zone.
June 18, 2009 8:50 PM
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