1900hurricane Posted June 18, 2014 Share Posted June 18, 2014 Supercell "L" from Dr. Fujita's survey of Palm Sunday 1965 spawned six F4s, including the Strongsville tornado (which may have been F5). The supercell tracked from SE of Lafayette, IN, to the Cleveland metro area. Impressive, thanks. I figured there would be at least a couple that dropped more from a very high end outbreak, but that supercell is certainly in elite company. As far as I can tell, there have only been ten entire tornado days since 1950 that have dropped more violent tornadoes than this single supercell! Link to comment Share on other sites More sharing options...
Stebo Posted June 18, 2014 Share Posted June 18, 2014 The cap is breaking, things should be going good in an hour. Link to comment Share on other sites More sharing options...
andyhb Posted June 18, 2014 Author Share Posted June 18, 2014 Cap busted in northern NE now. Omaha says no three at once https://twitter.com/nwsomaha/status/479397005798555648 That cell went from nothing to 50,000 feet in a flash. Link to comment Share on other sites More sharing options...
Gorky Posted June 18, 2014 Share Posted June 18, 2014 Cell in central SD south of Highmore skipped the Severe Thunderstorm warning and went straight to Confirmed ToG.. Link to comment Share on other sites More sharing options...
Gorky Posted June 18, 2014 Share Posted June 18, 2014 Stovepipe now... Link to comment Share on other sites More sharing options...
Ground Scouring Posted June 18, 2014 Share Posted June 18, 2014 very good analysis. if more convection had been able to fire anywhere close to E Nebraska today, it would've been a pretty memorable day (as if it wasn't already given the dual-wedges. And devastation in Pilger) Am pretty interested as to why that supercell lost a lot of its intensity as it crossed the NE/IA border, it's not like it crossed a boundary and moved into a far inferior environment or something like that. I've kinda noticed a bit of a trend with supercells like this one--that put down a significant long-lived tornado-- after the main tornado dissipates, the storm disappates as well within an hour or two, and fails to produce anymore noteworthy tornadoes. Esp across the plains. (Moore '99/'13, wichita '12, SE NEB a few weeks ago, And several other examples) correct me if I'm wrong, but it just seems to happen a lot, and yes there are numerous other instances where this did not happen and it continues to put down sig tor's for an extended amount of time afterward. But it certainly seems to happen at least semi-frequently. I thought it might have crossed into rain cooled air and/or subsidence from the previous convection, but I'd have to look at analysis from earlier (and also the s/w trough was passed it by that time meaning weaker deep layer shear). The storm merger might have also had an effect and it appeared that the storm was cut off from inflow as it approached the Sioux City area. The storm almost took on a NW flow type look as it was dying out. This was when the Sig. TOR parameter dropped from 15 or so down to 6-8 (I can't remember which). If I recall correctly, the environment had already recovered and little rain-induced cooling had occurred by the time the supercell neared Sioux City. Does anyone have a judgment as to why the supercell weakened? I would be very interested in understanding why. Link to comment Share on other sites More sharing options...
icebreaker5221 Posted June 18, 2014 Share Posted June 18, 2014 Looks like KFSD going with the 2 min scans again. Link to comment Share on other sites More sharing options...
andyhb Posted June 18, 2014 Author Share Posted June 18, 2014 50/50 tor probs. URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 327 NWS STORM PREDICTION CENTER NORMAN OK 625 PM CDT WED JUN 18 2014 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF EXTREME NORTHWESTERN IOWA EXTREME SOUTHWESTERN MINNESOTA NORTHEASTERN NEBRASKA SOUTHEASTERN SOUTH DAKOTA * EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 625 PM UNTIL 200 AM CDT. * PRIMARY THREATS INCLUDE... A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST SOUTHWEST OF MITCHELL SOUTH DAKOTA TO 35 MILES EAST SOUTHEAST OF SIOUX FALLS SOUTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. && OTHER WATCH INFORMATION...CONTINUE...WW 321...WW 322...WW 323...WW 324...WW 325...WW 326... DISCUSSION...TORNADIC SUPERCELL IS EXPECTED TO MOVE EWD OUT OF WW 322 SOON INTO NWRN PART OF THIS WW...WHILE ADDITIONAL DVLPMT IS PSBL BETWEEN THAT AND HIGHER-BASED ACTIVITY NOW STRENGTHENING RAPIDLY OVER ONL AREA S OF WARM/COLD FRONTAL TRIPLE POINT. ANY SUPERCELLS INTERACTING WITH VORTICITY-LADEN WARM FRONTAL ZONE MAY PRODUCE SIGNIFICANT TORNADOES...BUT ALSO EVOLVE INTO HEAVY-PRECIP MODE RATHER QUICKLY GIVEN WEAK STORM-RELATIVE MID-UPPER WINDS. LOW-LEVEL HODOGRAPHS ARE FCST TO REMAIN LARGE...ESPECIALLY ALG/N OF WARM FRONT NEAR NEB/SD BORDER. UPSCALE GROWTH INTO MCS IS PSBL AS WELL. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 650. MEAN STORM MOTION VECTOR 24020. ...EDWARDS Link to comment Share on other sites More sharing options...
andyhb Posted June 18, 2014 Author Share Posted June 18, 2014 The NE cell appears to be struggling against the cap. Link to comment Share on other sites More sharing options...
SmokeEater Posted June 18, 2014 Share Posted June 18, 2014 Brandon Ivey, probably in the TIV. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted June 18, 2014 Share Posted June 18, 2014 The NE cell appears to be struggling against the cap. 2305 5 E STEPHAN HYDE SD 4425 9936 TWO HOMES LOST ROOF FROM TORNADO. TIME APPROXIMATED. (ABR) 2313 10 E STEPHAN HAND SD 4425 9925 ONE-QUARTER MILE WIDE TORNADO ON GROUND NEAR 216TH ST AND 346TH AVE MOVING EAST-NORTHEAST (ABR) Link to comment Share on other sites More sharing options...
andyhb Posted June 18, 2014 Author Share Posted June 18, 2014 2305 5 E STEPHAN HYDE SD 4425 9936 TWO HOMES LOST ROOF FROM TORNADO. TIME APPROXIMATED. (ABR) 2313 10 E STEPHAN HAND SD 4425 9925 ONE-QUARTER MILE WIDE TORNADO ON GROUND NEAR 216TH ST AND 346TH AVE MOVING EAST-NORTHEAST (ABR) And that's in SD, not NE. Link to comment Share on other sites More sharing options...
andyhb Posted June 18, 2014 Author Share Posted June 18, 2014 Strong couplet on that SD cell now. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted June 18, 2014 Share Posted June 18, 2014 And that's in SD, not NE. Of course it is, the only place that has a Tornado warning in place. Link to comment Share on other sites More sharing options...
SmokeEater Posted June 18, 2014 Share Posted June 18, 2014 Of course it is, the only place that has a Tornado warning in place.Andy was talking about the cell that died in NE, you quoted his post with reports in SD like he meant the SD cell was dying, lol. Link to comment Share on other sites More sharing options...
andyhb Posted June 18, 2014 Author Share Posted June 18, 2014 Tornado on the TIV stream. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted June 19, 2014 Share Posted June 19, 2014 Tornado on the TIV stream. Link to comment Share on other sites More sharing options...
andyhb Posted June 19, 2014 Author Share Posted June 19, 2014 Multiple vortex now. Link to comment Share on other sites More sharing options...
Windspeed Posted June 19, 2014 Share Posted June 19, 2014 Large tornado evolving now on the TIV stream.... Edit: Those guys are on fire right now. Link to comment Share on other sites More sharing options...
andyhb Posted June 19, 2014 Author Share Posted June 19, 2014 That storm has a monstrous meso. Link to comment Share on other sites More sharing options...
NaoPos Posted June 19, 2014 Share Posted June 19, 2014 Large tornado evolving now on the TIV stream.... Edit: Those guys are on fire right now. link for their stream? Link to comment Share on other sites More sharing options...
BuffaloWeather Posted June 19, 2014 Share Posted June 19, 2014 link for their stream? Link to comment Share on other sites More sharing options...
tornadotony Posted June 19, 2014 Share Posted June 19, 2014 Unbelievable. Another storm of the night. Wessington Springs in big trouble. Link to comment Share on other sites More sharing options...
thewxmann Posted June 19, 2014 Share Posted June 19, 2014 Based on the velocity data there could be two intense tornadoes ongoing right now in Jerauld County. Link to comment Share on other sites More sharing options...
1900hurricane Posted June 19, 2014 Share Posted June 19, 2014 We might have multiple mesocyclones (again) according to radar. Link to comment Share on other sites More sharing options...
andyhb Posted June 19, 2014 Author Share Posted June 19, 2014 Large tornado reported by Ivey. Link to comment Share on other sites More sharing options...
NaoPos Posted June 19, 2014 Share Posted June 19, 2014 Tapatalk Link to comment Share on other sites More sharing options...
Disc Posted June 19, 2014 Share Posted June 19, 2014 Two very well-defined areas of circulation. Link to comment Share on other sites More sharing options...
tornadotony Posted June 19, 2014 Share Posted June 19, 2014 Uncertain for sure, but could be a small TDS along S.R. 34 W of Wessington Springs. Link to comment Share on other sites More sharing options...
Windspeed Posted June 19, 2014 Share Posted June 19, 2014 Both are rainwrapped.... Link to comment Share on other sites More sharing options...
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