Derecho Strikes Nebraska, Iowa With 85 mph Winds

[Music] looking live at the operations floor at acuweather HQ we're over here this is where we have our experts and and um I want to bring in our chief meteorologist John Porter again Mike do will'll be talking with Mike doall at 9:30 he made the call early this morning that this is a dur ratio it's meet the criteria we'll get to the Criterion a little bit here but first John the real question is is how long do we think this line is going to be maintained we were looking at a couple of things it appears as though there is some evidence that this may start the weekend in the next couple of hours that's right I think the key point is at least for the next couple of hours we're going to be dealing with the risks for 70 to 75 mph thunderstorm wind gust thereafter as it continues to truck across Northern Illinois there can be some gradual weakening we'll be watching that uh still a dangerous setup here this morning what a month last 30 days this is pretty unprecedented maybe not but certainly one of the longest stretches of severe weather that we've seen at least years no doubt and different all across the uh Central and Eastern part of the country spread it's like a it's like your water hose on your water hose outside on spray and not in a good way and not in a good way all right let's take the radar right now because I'm going to get back in take a little hop skip and a jump back into the um um into the operations area here with out of the operations and into the studio here there's the radar and there's the ratio that we continue to watch here uh as it moves Eastward and um there it is okay I'm going to stop put into motion for you yeah thank you are do you have the duratio explainer I don't but I can put it up could you put that up I want to get to that in a second here uh but really quick uh there's the damaging line of thunderstorms now uh roughly from debuk all the way down toward Burlington uh Illinois right now and you can see within this line several segments where the thunderstorm stms are Bo out to the north and east that's where we're getting the damaging winds now in in addition we we've seen this throughout the morning that sections of this line we've seen tornado warnings here and what's happening is within this line of thunderstorms and you can see these little notches you see one here you see one here uh I see one here south of dport so anywhere within this line of thunderstorms you are going to have damaging wind gust and you're going to get isolated tornadoes we're going to see wind gust over 70 mph the strongest line appears to be right in here now just east of Dort I I I've been showing this all morning and I want to continue to do so this is the correlation coefficient you see this area of blue this is where you have such strong winds uh out ahead of this thunderstorm complex that dust and debris is being lofted into the air and that's that blue that you see right in here you see that that's what's going on now we use the term the ratio uh Mike do one of our ACU weather severe weather experts made the call we'll be talking with him at the bottom of the hour what is it the ratio yeah and we're glad he was keeping eyes on this because we saw damaging wind reports starting late last night over 58 miles per hour that's one of the criteria you can see the bottom bullet there continuous winds of at least 58 milph for at least 400 miles with a width of at least 60 miles so there's a lot going on a lot of criteria to meet this but if we look back at just some of the storm reports over the last 12 hours I want to take a look I believe somewhere around here we had winds gusting that one 70 M hour so well above that so if we want to take that line from about that storm report and then all of these storm reports within here have been 58 miles hour or greater and this has been a stretch of over 400 miles and we're continuing to see that moving on through and some of these winds well above 58 mil hour look at this in Harwell 85 miles per hour St Laura South Dakota 76 miles per hour and Bernie unfortunately Greenfield Iowa for people who may not remember that was just the area hit so hard by at least an ef3 Tornado from just Tuesday now they saw winds gusting up to 75 miles with all that debris on the ground that I'm afraid of what it looks like here this morning all right thanks Ariel let's take a look at the radar here it's pouring in Rochester Minnesota by the way here's the radar let's take you out to Rochester uh Minnesota here where the rain is coming on down and you could see some ponding of the water on the road look at the clars there uh going through that wet all all of the wet streets are there again there is some ponding on the roadways here uh straight out to the radar there's the heavier rain here is that the ratio now in eastern parts of Iowa and that continues to just Barrel Eastward and that's the real question is how far does it get before it starts a weekend there is some evidence that the atmosphere is not conducive enough to to maintain this thetio listen for a the ratio you need a you need a lot of energy in the atmosphere here so we're going to watch this line there is a severe thunderstorm watch because of this the ratio that extends all the way toward Chicago till about 1:00 so this gives you a a sense of the timing although usually with these the ratios they're faster not slower so let's continue to watch this there is some suggestion that that line May lift a little farther to North so there's the the ratio and here it is roughly at around 10:00 Central so in an Iowa's time it's it's near the Rockford area now you'll notice this lifts northward I'm going to stop it now because this the ratio went across Northern Illinois and Southern Wisconsin I believe the severe weather will likely be over for you I just do not believe this model that you have these strong thunder storms back behind a deratio that's not the way the atmosphere works I am worried though where that thetio doesn't impact and that's roughly maybe around Chicago on South that's where to watch the thunderstorms look at those and and again you're going to see the modeling coming in my way of thinking here over the next couple of hours it'll adjust as that area comes through now how can I be wrong if that the ratio just falls apart then we'll have a different discussion I I don't think that's going to be the case so again that the ratio will stabilize the atmosphere in Northern Illinois and Southern Wisconsin now Chicago Poria watch those thunderstorms that's the area to watch and you could see the modeling starting to go in that direction here so that's the Zone when I look at the moderate area think of this as this morning this area in here north of Chicago Rockford Madison Milwaukee your severe weather threat here will be this morning and early this afternoon Chicago on South I think it's mid the late afternoon and into the evening hours I think all forms of severe weather but wind um damaging winds isolated tornadoes I suspect we're looking at several on the ground this afternoon I don't think we're looking at dozens but there could be several [Music]

Channel: AccuWeather

Views: 17,757

Keywords: accuweather, weather, weather news, extremeweather, derecho, nebraska, iowa, high winds, may 24

Id: OPaWhfxTAzI

Length: 7min 5sec (425 seconds)

Published: Fri May 24 2024