Jonbo Posted May 27, 2013 Share Posted May 27, 2013 Only what Iowa has gotten in the last 72 hours. Link to comment Share on other sites More sharing options...
ZackH Posted May 28, 2013 Share Posted May 28, 2013 Here's the footage my wife and I got of the incredible SD supercell on 5/25/2013. We followed it from Sturgis until it died near Wall. Some good hail footage, a wall cloud/funnel that almost went down. And some of the coolest timelapse I've ever scored yet. This was the most amazing non-tornadic storm I've ever seen. Link to comment Share on other sites More sharing options...
Chicago Storm Posted June 11, 2013 Share Posted June 11, 2013 Heat burst occuring in S-C. Nebraska... Link to comment Share on other sites More sharing options...
A-L-E-K Posted June 11, 2013 Share Posted June 11, 2013 heat bursts are so cool Link to comment Share on other sites More sharing options...
Chinook Posted June 11, 2013 Share Posted June 11, 2013 The SPC put out a moderate risk today for southern South Dakota, due to high CAPE and strong shear profiles expected there. The NAM shows pretty high storm-relative helicity for this area tonight, up to 300 m2/s2. It would appear that deep layer shear may be around 55 knots, so I am impressed by shear. I am not entirely convinced about convective coverage there. Link to comment Share on other sites More sharing options...
mfgmfg Posted June 12, 2013 Share Posted June 12, 2013 The SPC put out a moderate risk today for southern South Dakota, due to high CAPE and strong shear profiles expected there. The NAM shows pretty high storm-relative helicity for this area tonight, up to 300 m2/s2. It would appear that deep layer shear may be around 55 knots, so I am impressed by shear. I am not entirely convinced about convective coverage there. 0100Z outlook no longer has moderate risk, looks like the wind threat is still there, but slightly lower than forecasted. Link to comment Share on other sites More sharing options...
andyhb Posted June 14, 2013 Share Posted June 14, 2013 Tornado watch issued for E NE and W IA until 10 PM. URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 313 NWS STORM PREDICTION CENTER NORMAN OK 340 PM CDT FRI JUN 14 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF EXTREME WESTERN IOWA EASTERN NEBRASKA * EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 340 PM UNTIL 1000 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL TORNADOES POSSIBLE SEVERAL VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF NORFOLK NEBRASKA TO 25 MILES SOUTHEAST OF LINCOLN NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). 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 312... DISCUSSION...THUNDERSTORMS IN S CENTRAL NEB WILL CONTINUE TO SPREAD NEWD TOWARD NE NEB THIS AFTERNOON...WHERE ADDITIONAL SURFACE-BASED DEVELOPMENT WILL BE POSSIBLE NEAR THE TRIPLE POINT. THE ENVIRONMENT FROM THE TRIPLE POINT SEWD ACROSS ERN NEB IS CHARACTERIZED BY BOUNDARY LAYER DEWPOINTS NEAR 70 F AND SURFACE TEMPERATURES APPROACHING 90 F FROM THE SW...WHICH WILL CONTINUE TO WEAKEN CONVECTIVE INHIBITION AND SUPPORT NEW STORM DEVELOPMENT. MEANWHILE...THE OAX VWP SHOWS A RELATIVELY LARGE CLOCKWISE TURNING HODOGRAPH...WITH SUFFICIENT VERTICAL SHEAR FOR SUPERCELLS. GIVEN EFFECTIVE SRH NEAR 300 M2/S2...MLCAPE OF 3000-4000 J/KG...AND MLLCL HEIGHTS NEAR 1250 M...A FEW TORNADOES AND ISOLATED VERY LARGE HAIL WILL BE POSSIBLE WITH THE INITIALLY MORE DISCRETE STORMS. LATER THIS EVENING...SOME UPSCALE GROWTH IS EXPECTED INTO A SMALL SEWD-MOVING MCS...WITH AN ATTENDANT RISK FOR DAMAGING GUSTS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 27020. ...THOMPSON Link to comment Share on other sites More sharing options...
Chinook Posted June 14, 2013 Share Posted June 14, 2013 Wow they issued that tornado watch with absolutely nothing on the radar in the watch area. Link to comment Share on other sites More sharing options...
andyhb Posted June 14, 2013 Share Posted June 14, 2013 Storms initiating near Grand Island should move into an increasingly favorable parameter space over the next couple of hours, although the LCLs still appear a bit high, even when accounting for RAP bias. Link to comment Share on other sites More sharing options...
Thunder Road Posted June 14, 2013 Share Posted June 14, 2013 Still some up-and-down and lots of other little showers popcorning around the two big ones. Need something to go northeast of there to be truly isolated and have a real tornado threat, imo. Link to comment Share on other sites More sharing options...
brettjrob Posted June 14, 2013 Share Posted June 14, 2013 Still some up-and-down and lots of other little showers popcorning around the two big ones. Need something to go northeast of there to be truly isolated and have a real tornado threat, imo. Agreed. Been sitting in OFK for an hour or so, and now becoming concerned with the lack of robust towers anywhere near this area. The convective signal from both global/regional and high-res models for NE NE has been quite strong, so it's tough to believe this will cap bust, but we probably need something to pop in the next 30-60 minutes. I was more worried about storm mode than initiation when I left this morning. Of course, if the existing area of convection SW of OLU is the only show, storm mode looks rather doomed (for chasers). Link to comment Share on other sites More sharing options...
Indystorm Posted June 14, 2013 Share Posted June 14, 2013 Low and mid level helicity ramp up significantly as one approaches the MO river. Hopefully that will aid in discrete formation or the breaking up into discrete cells of the ones already approaching that area. Link to comment Share on other sites More sharing options...
Thunder Road Posted June 14, 2013 Share Posted June 14, 2013 41 kft tops on a 23 dBZ shower SE of Norfolk in Stanton County at the intersection of two boundaries. Here we go boys. Link to comment Share on other sites More sharing options...
ZackH Posted June 14, 2013 Share Posted June 14, 2013 Watching a cell going up north of Clarkson.... big tower... couple rumbles of thunder. This could be our one big chance today. Link to comment Share on other sites More sharing options...
brettjrob Posted June 14, 2013 Share Posted June 14, 2013 Cell looks like a complete joke visually... high, laminar (capped-looking) based. We shall see. Link to comment Share on other sites More sharing options...
ZackH Posted June 14, 2013 Share Posted June 14, 2013 Yah, its high but its only just started going up. It may not amount to anything, but its really the best chance at this point unless you go for the HP disasters SW. Link to comment Share on other sites More sharing options...
brettjrob Posted June 14, 2013 Share Posted June 14, 2013 Yah, its high but its only just started going up. It may not amount to anything, but its really the best chance at this point unless you go for the HP disasters SW. Agreed, staying on it for now. Looking ever so slightly better... just can't tell if it's sfc based. Link to comment Share on other sites More sharing options...
Chicago Storm Posted June 14, 2013 Share Posted June 14, 2013 That new development SW of Beemer, NE has already crossed the westward moving OFB. Doesn't really matter though, as that activity out near Aurora/Columbus is rapidly approaching and will likely be the main show for the day. I know some of the short term/hi-res runs from last night showed this exact scenario occuring. Link to comment Share on other sites More sharing options...
andyhb Posted June 14, 2013 Share Posted June 14, 2013 MESOSCALE DISCUSSION 1083 NWS STORM PREDICTION CENTER NORMAN OK 0611 PM CDT FRI JUN 14 2013 AREAS AFFECTED...ERN NEB INTO EXTREME WRN IA CONCERNING...TORNADO WATCH 313... VALID 142311Z - 150045Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 313 CONTINUES. SUMMARY...THREAT FOR ISOLATED TORNADOES...LARGE HAIL AND DAMAGING WIND PERSIST ACROSS ERN NEB INTO EXTREME WRN IA. GREATEST SEVERE THREAT INCLUDING POTENTIAL FOR ISOLATED TORNADOES WILL LIKELY EXIST OVER ECNTRL NEB THROUGH 01Z. DISCUSSION...CLUSTER OF STORMS THAT DEVELOPED OVER SCNTRL NEB ARE FORWARD PROPAGATING ALONG THE NERN EXTENSION OF THE ATTENDANT OUTFLOW BOUNDARY. THESE STORMS HAVE PREVIOUSLY BEEN HIGH BASED...BUT ARE NOW MOVING INTO AN ENVIRONMENT ACROSS ERN NEB WHERE DEWPOINTS NEAR 70 ARE SUPPORTING STRONG INSTABILITY /2000-3000 J/KG MLCAPE/ AND LOWER LCLS. SFC ANALYSIS AND RADAR DATA INDICATE PRESENCE OF A NNW-SSE ORIENTED FRONT/BOUNDARY ACROSS ERN NEB...AND VWP DATA SHOW SUFFICIENTLY LARGE HODOGRAPHS IN THE 0-2 KM LAYER WITH 200 M2/S2 STORM RELATIVE HELICITY. STORMS WILL DEVELOP INTO AN INCREASINGLY FAVORABLE ENVIRONMENT FOR SUPERCELLS AND LOW LEVEL MESOSCYCLONES ACROSS ERN NEB NEXT COUPLE HOURS WITH AN ATTENDANT THREAT FOR ISOLATED TORNADOES AND LARGE HAIL...ESPECIALLY IF STORMS CAN MAINTAIN DISCRETE OR SEMI-DISCRETE STRUCTURES. ..DIAL.. 06/14/2013 Link to comment Share on other sites More sharing options...
Chicago Storm Posted June 14, 2013 Share Posted June 14, 2013 Looks like that cell has re-developed back onto the OFB. Small window of opportunity for it now. Link to comment Share on other sites More sharing options...
andyhb Posted June 14, 2013 Share Posted June 14, 2013 That new development SW of Beemer, NE has already crossed the westward moving OFB. Doesn't really matter though, as that activity out near Aurora/Columbus is rapidly approaching and will likely be the main show for the day. I know some of the short term/hi-res runs from last night showed this exact scenario occuring. Looking good on reflectivity, inflow increasing. Link to comment Share on other sites More sharing options...
brettjrob Posted June 14, 2013 Share Posted June 14, 2013 Decent structure now... would be better if not for all the cirrus around it. Link to comment Share on other sites More sharing options...
aurora Posted June 14, 2013 Share Posted June 14, 2013 Looks like decent rotation WSW of West Point. Link to comment Share on other sites More sharing options...
brettjrob Posted June 14, 2013 Share Posted June 14, 2013 Structure has become rather awesome... I can see a nice RFD cut in the rain but am staying back for now. Anyone right under it? Link to comment Share on other sites More sharing options...
Chinook Posted June 15, 2013 Share Posted June 15, 2013 I'm seeing a TVS marker on GRLevel3 west of West Point Nebraska. SRV 1.8 shows 66 knots and -14 knots. Link to comment Share on other sites More sharing options...
andyhb Posted June 15, 2013 Share Posted June 15, 2013 Great inflow into that storm from Mike Phelps' cam. Link to comment Share on other sites More sharing options...
Thunder Road Posted June 15, 2013 Share Posted June 15, 2013 My mobile internet is too limited for chaser streams. Can you post screen grabs? Link to comment Share on other sites More sharing options...
andyhb Posted June 15, 2013 Share Posted June 15, 2013 My mobile internet is too limited for chaser streams. Can you post screen grabs? Stream froze up. Link to comment Share on other sites More sharing options...
Ian Posted June 15, 2013 Share Posted June 15, 2013 Umscheid tweeted it had more than 7 tiered plates Link to comment Share on other sites More sharing options...
mfgmfg Posted June 15, 2013 Share Posted June 15, 2013 Seemed like that cell wasn't moving on radar. Link to comment Share on other sites More sharing options...
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