ElectricStorm Posted April 19 Share Posted April 19 (edited) We are approaching the heart of the 2024 season and right on cue Broyles is back at it again with another Day 7 15% 🙂 Looking at models, the potential for a multi-day severe event is there but at this range it's really just speculation. Something to watch as we get closer though.  Edited May 4 by ElectricStorm Link to comment Share on other sites More sharing options...
ElectricStorm Posted April 20 Author Share Posted April 20 Now a broad Day 7 15% added for next Friday. I think the trough will probably slow down a bit like usual, so I'm thinking Thursday might end up being a little more west, while Friday/Saturday and maybe Sunday could be bigger events further east. A week out though so a lot can and will change. Link to comment Share on other sites More sharing options...
Iceresistance Posted April 20 Share Posted April 20 1 hour ago, ElectricStorm said: Now a broad Day 7 15% added for next Friday. I think the trough will probably slow down a bit like usual, so I'm thinking Thursday might end up being a little more west, while Friday/Saturday and maybe Sunday could be bigger events further east. A week out though so a lot can and will change. I hope 4.27 isn't the crazy day for Oklahoma Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 20 Share Posted April 20 (edited) This time period is looking like a classic multi-day outbreak sequence. Here is a 5 day average on the 12z gefs Edited April 20 by StormfanaticInd Link to comment Share on other sites More sharing options...
Moderators Central Illinois Posted April 20 Moderators Share Posted April 20 Looks like Late next week and the weekend could be primed for severe weather Link to comment Share on other sites More sharing options...
Iceresistance Posted April 22 Share Posted April 22 I would start it on the 24th with this Marginal Risk on the 24th Link to comment Share on other sites More sharing options...
Meteorologist Ingyball Posted April 23 Meteorologist Share Posted April 23 The multi-day aspect of this sequence is what has me concerned. We've seem some of the worst tornadoes to hit the Plains and Mississippi Valley come from these. Obviously analogs aren't the end all be all (as we have seen). But the analogs for 4/27 has both multiple heavy hitters and plenty of moderate risk worthy outbreaks to go with it as well. 1 Link to comment Share on other sites More sharing options...
Meteorologist ClicheVortex2014 Posted April 23 Meteorologist Share Posted April 23 NAM sounding for Amarillo ahead of the dryline... I guess that would favor some severe weather. Link to comment Share on other sites More sharing options...
Chinook Posted April 23 Share Posted April 23 The GFS and NAM have a great dryline for Thursday. Right now the NAM has some capping, but I expect several severe storms in the southern Plains. As of recently, the southern Plains has had some capping issues. I'm sure the Day-3 discussion written tonight will have lots of insights. Â Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 23 Share Posted April 23 8 hours ago, Ingyball said: The multi-day aspect of this sequence is what has me concerned. We've seem some of the worst tornadoes to hit the Plains and Mississippi Valley come from these. Obviously analogs aren't the end all be all (as we have seen). But the analogs for 4/27 has both multiple heavy hitters and plenty of moderate risk worthy outbreaks to go with it as well. I'm pretty certain there is going to be some moderate risks in this setup. We are getting close to May which usually means look out Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 23 Share Posted April 23 Â Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 23 Share Posted April 23 (edited) Spc just upgraded day 3 to enhanced with some decent wording. NWS Storm Prediction Center Norman OK   0131 PM CDT Tue Apr 23 2024    Valid 251200Z - 261200Z    ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM THE   EASTERN TX PANHANDLE AND WESTERN OK INTO SOUTHWEST/SOUTH-CENTRAL   KS...    AMENDED TO UPDATE FORECAST    ...SUMMARY...   Severe thunderstorms are likely from late Thursday afternoon into   Thursday night across parts of the central and southern Great   Plains. Very large hail, severe wind gusts, and strong tornadoes   will all be possible.    Guidance continues to suggest strong buoyancy will be in place ahead   of a negatively tilted shortwave trough ejecting across the southern   High Plains. General forecast expressed in the previous outlook   remains valid, but confidence in an area of greater severe-weather   potential has become more apparent with the most recent guidance.   Late afternoon development is anticipated across the TX Panhandle,   with these storms quickly becoming severe and capable of large to   very large hail up to 3" in diameter. Low-level moisture may be   later to arrive in west-central/southwest KS, delaying convective   initiation to a few hours later than farther south. Large to very   large hail is anticipated with initial development across   west-central/southwest KS as well.    In both of these areas, storms are expected to move   east-northeastward off the dryline, encountering strengthening   low-level southerly flow and environment that is increasingly   favorable for tornadoes. Low-level shear will continue to   strengthening into the early evening, and the overall environment   supports the potential for strong to intense tornadoes if a discrete   mode can be maintained. Edited April 23 by StormfanaticInd Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 23 Share Posted April 23 Interesting... Â 1 Link to comment Share on other sites More sharing options...
snowlover2 Posted April 24 Share Posted April 24 Tornado warning up in MI west of Hastings. Link to comment Share on other sites More sharing options...
ElectricStorm Posted April 24 Author Share Posted April 24 I'm still wondering if the cap will be breakable on Thursday or not, especially with how dry the EML source region has been lately. Most CAMs seem to fire at least a few storms but most of them don't really seem Day 3 enhanced worthy quite yet, although CAMs can be a little questionable at this range. I think the initial slight risk for Day 3 was just fine. Not sold yet on a major outbreak but anything that does end up breaking the cap it would probably be a strong tornado producer. I think Saturday could end up being a pretty big event but there could be some morning convection issues so we'll see when we get closer how potent it ends up being. Link to comment Share on other sites More sharing options...
Neoncyclone Posted April 24 Share Posted April 24 Four days of 80-85 CWASP.. big active period right on our doorstep now   Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 24 Share Posted April 24 2 hours ago, Neoncyclone said: Four days of 80-85 CWASP.. big active period right on our doorstep now   Those are some very serious probilities. Starting to get a bad feeling about this event Link to comment Share on other sites More sharing options...
ElectricStorm Posted April 24 Author Share Posted April 24 Hall of Fame 12z NAM run for Saturday, parameters are insane. Thankfully that's very likely not happening 1 1 Link to comment Share on other sites More sharing options...
Neoncyclone Posted April 24 Share Posted April 24 This is only 12z NAM but if it somehow verified this would be one of the hands down largest warm sectors i've ever seen for the plains, and it's not even close tbh. Luckily it's just the NAM so no need to worry too much yet. This is for Saturday btw. Â Link to comment Share on other sites More sharing options...
Chinook Posted April 24 Share Posted April 24 16 hours ago, ElectricStorm said: I'm still wondering if the cap will be breakable on Thursday or not, especially with how dry the EML source region has been lately. Most CAMs seem to fire at least a few storms but most of them don't really seem Day 3 enhanced worthy quite yet, although CAMs can be a little questionable at this range. I think the initial slight risk for Day 3 was just fine. Not sold yet on a major outbreak but anything that does end up breaking the cap it would probably be a strong tornado producer. I think Saturday could end up being a pretty big event but there could be some morning convection issues so we'll see when we get closer how potent it ends up being. The 18z HRRR is finally deciding to bust out some isolated storms near the dryline tomorrow. The CAMs have not given me a lot of confidence in the Enhanced risk forecast given by the SPC tomorrow. Certainly there could be 2" hail and tornadoes where storms happen tomorrow. Who am I to say, though? Maybe the SPC will be on target. For Friday, there looks like a great low-level jet or wind speeds or whatever you call it. Several areas severe storms could be (as mentioned in a previous post) occurring in an extensive warm sector. Link to comment Share on other sites More sharing options...
Meteorologist Ingyball Posted April 24 Meteorologist Share Posted April 24 Right now I think tomorrow is the day before the bigger days. That doesn't mean a big tor can't happen tho, we've seen those days produce devastating tornadoes before.  I am a little hesitant with the orientation of the upper jet on 4/27, I think it could lead to some messy storm mode. But, with there likely being some sort of capping just due to the region it's in, it could also be a dangerous combo. The more meridional upper flow supports hodographs where the 3 to 6km winds curve upward. This favors Supercells with forward flank downdrafts well out ahead of the rear flank down drafts, which favors long track supercells. The question will be if there's enough space for these storms to go, or of storms will be merging constantly. 2 Link to comment Share on other sites More sharing options...
Meteorologist ClicheVortex2014 Posted April 24 Meteorologist Share Posted April 24 (edited) Here's my writeup for tomorrow for the Panhandles. Lots of "if"s regarding convective initiation, but bets are off if we get a sustained updraft. Morning clouds are lingering this afternoon and should, for the most part, linger throughout the night as well... though some breaks in the clouds are possible this afternoon. Temperatures will remain in the 60s for much of the area except for the southwest, where 70s are possible. A surge of mid-level theta-e advection is expected this evening in the southeastern half of the Panhandles which may be enough to kick off some showers generally off the caprock. Previous model suites suggested that portions of this area may be uncapped which would support a threat for elevated strong to severe thunderstorms, but latest models now suggest that the cap may be too strong for updrafts to overcome. Can`t entirely rule out a strong to severe thunderstorm in the SE TX Panhandle as that area has the weakest cap, but it is generally not looking as favorable for strong to severe thunderstorms tonight. Clouds will linger into Thursday morning for much of the area, perhaps with some showers and isolated thunderstorms in the east. Meanwhile, the upper-level trough begins to take a negative tilt with the upper-level jet streak approaching the CWA. By 12z Thursday, the dryline is favored to be in the vicinity of the Texas/New Mexico border, with low-60 dew points in the southeast and low-50 dew points as far west as Dalhart and Boise City. Most model guidance begins to clear the clouds from west to east from the mid to late morning hours through the afternoon, allowing for temperatures to warm and the dryline to move eastward and gradually sharpen as it encounters the deeper moisture present in the east. It is worth noting that the 12km and 3km NAM keep low clouds lingering all day in the east, keeping temperatures in the 60s and 70s. This would most likely negate any severe thunderstorm concerns as the cap would be too strong to support convective initiation. However, it is a known bias in those products to keep cool temperatures wedged in and weaken mixing during the day. Given their known bias and that those products are currently the outliers, will not be giving much credence to the idea that clouds linger in the east all day at this time. The more favored solution is that the clouds clear out in the afternoon and destabilization occurs in the central and east Panhandles. Models suggest a robust cap will be in place prior to destabilization occurring, with the warmest temperature in the inversion around 11C to 13C, but this cap should weaken with daytime mixing. By the mid to late afternoon hours, the dryline is most favored to set up in the central combined Panhandles, aligned in a north-south fashion from the vicinity of Guymon to Amarillo, perhaps slightly further east. Significant uncertainties exist about the environment at that time such as: 1) How much will the cap be weakened? Most guidance that isn`t the 3km or 12km NAM has MLCIN ranging from near-0 J/kg to -75 J/kg, suggesting no cap to a moderate cap. This will depend on the actual strength of the inversion and when the morning clouds clear out. 2) A lead wave with some mid to upper-level forcing is expected to swing through the Panhandles in the afternoon, but the timing will be important. If it arrives too early, the cap may still be too strong for thunderstorms to develop. If it arrives too late in the afternoon or early evening when temperatures are beginning to cool, the cap may once again be too strong for thunderstorms to develop. 3) Some CAMs suggest that there may be a dryline bulge which may be a cause for enhanced surface wind and moisture convergence. This may aid in convective initiation. Current thinking is if there was a more favorable corridor for thunderstorms to develop, it would be in the northern TX Panhandles or eastern half of the OK Panhandle as that area is currently favored to clear out first, and is in a more favorable position for upper-level divergence should the timing be favorable as well. Regardless, if a thunderstorm is indeed able to develop anywhere along the dryline, models suggest 1500-2500 J/kg of MLCAPE, potentially as much as 3000 J/kg along with 45-55 kts of effective shear. Storm relative helicity (SRH) values are favored to be between 50-150 m2/s2 between 0-1km, and 100-200 m2/s2 between 0-3km. If there is a sustained updraft, all of these factors suggest that a supercell would quickly develop with all severe hazards possible, and a splitting supercell would be possible given a long and fairly straight hodograph in the afternoon. Baseball hail (2.75") would be possible, if not larger if the higher end of the range of instability verifies. Damaging winds and tornadoes would be possible as well. A strong tornado (EF2+) would be possible given the low- level shear, low-level instability, and LCLs between 1000m to 1250m (not great but not necessarily unfavorable), with a peak timing window in the late afternoon/early evening when the LLJ strengthens. Any thunderstorm would continue through the evening but presumably weaken as convective inhibition increases. A Pacific front will overtake the dryline Thursday night and push all moisture out of the Panhandles. Vanden Bosch  Edited April 24 by ClicheVortex2014 4 Link to comment Share on other sites More sharing options...
StormfanaticInd Posted April 25 Share Posted April 25 Saturday is looking high end.  Link to comment Share on other sites More sharing options...
ElectricStorm Posted April 25 Author Share Posted April 25 Not quite sold on a major tornado outbreak Saturday yet. Will probably end up with morning convection and the next wave could end up firing too early. That being said though the setup is there if the morning wave can move out quick enough. Won't know for sure the threat level until the day of. Link to comment Share on other sites More sharing options...
ElectricStorm Posted April 25 Author Share Posted April 25 0z HRRR has a significant tornado outbreak for IA/NE on Friday which is certainly concerning. Of course 48hr HRRR isn't the best but I'd expect a 10# tornado area to be added at the upcoming Day 2 outlook. Link to comment Share on other sites More sharing options...
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