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June 3rd-6th Severe Thread


andyhb

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I bet many NWSFO's are just itching to issue TOR warnings after such a quiet season :P

North Platte just issued a severe on it further east and much of the hook is in their warning. Gotta love CWA border issues. 

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MESOSCALE DISCUSSION 0799
NWS STORM PREDICTION CENTER NORMAN OK
0437 PM CDT TUE JUN 03 2014

AREAS AFFECTED...ERN NEB...SRN IA...NRN MO

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 032137Z - 032300Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...SIGNIFICANT TORNADO AND WIND DAMAGE THREAT IS INCREASING
ACROSS PARTS OF FAR ERN NEB INTO SW IA/NRN MO NEAR THE WARM FRONT.
THIS THREAT WILL SHIFT E/SE INTO SE IA/NE MO LATER THIS EVENING. A
NEW TORNADO WATCH WILL BE NEEDED IN THE NEXT 1-2 HOURS...PRIOR TO
THAT...A LOCAL EXTENSION TO THE EAST FOR TORNADO WATCH 207 IS
LIKELY.

DISCUSSION...A VERY FAVORABLE ENVIRONMENT FOR TORNADOES AND EXTREME
WINDS IS EVOLVING ACROSS PARTS OF THE MID-MO VALLEY IN THE VICINITY
OF THE WARM FRONT. THIS FRONT EXTENDS E/SE ACROSS CENTRAL NEB INTO
SW IA AND N-CENTRAL MO. SFC DEWPOINTS IN THE MID 60S TO LOW 70S AND
STRONG SFC HEATING HAVE RESULTED IN SBCAPE VALUES APPROACHING 4500
J/KG IN THE WARM SECTOR. SUPERCELLS HAVE DEVELOPED ON/NEAR THE WARM
FRONT NEAR THE MO/IA BORDER AND WILL CONTINUE TO POSE A THREAT FOR
STRONG WINDS...LARGE HAIL AND TORNADOES. FURTHER UPSTREAM...A BOWING
SEGMENT NEAR OMAHA SHOULD THRIVE IN THIS ENVIRONMENT AND CONTINUE ON
A SEWD TRAJECTORY ALONG THE WARM FRONT/INSTABILITY GRADIENT.
SIGNIFICANT WINDS IN EXCESS OF 65KT WILL CONTINUE TO BE POSSIBLE
WITH THIS BOWING SEGMENT...IN ADDITION TO LARGE HAIL.

AS THE LOW LEVEL JET INCREASES THIS EVENING...CONDITIONS WILL BECOME
MORE FAVORABLE FOR TORNADO DEVELOPMENT AS LOW LEVEL HODOGRAPHS
BECOME MAXIMIZED IN THE VICINITY OF THE BOUNDARY. ANY SUPERCELLS
THAT CAN REMAIN SEMI-DISCRETE WILL POSE A STRONG/SIGNIFICANT TORNADO
THREAT. EVENTUALLY...STORMS ARE EXPECTED TO GROW UPSCALE INTO A
FORWARD PROPAGATING BOWING QLCS ACROSS SE IA/NE MO WITH THE
POTENTIAL FOR A WIDE SWATH OF EXTREME/DAMAGING WINDS ACROSS THE MCD
AREA.

TORNADO WATCH 207 HAS BEEN EXTENDED EWD FOR THE TIME BEING ACROSS
PARTS OF SRN IA/NRN MO. A NEW WATCH WILL LIKELY BE ISSUED IN THE
NEXT HOUR OR TWO.

..LEITMAN/HART.. 06/03/2014

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apparently there is a confirmed tornado between Ericson and Ord, NE

 


* AT 442 PM CDT...A CONFIRMED TORNADO WAS LOCATED 8 MILES SOUTHWEST
  OF ERICSON...OR 9 MILES NORTHEAST OF ORD...MOVING EAST AT 35 MPH.

  HAZARD...DAMAGING TORNADO AND BASEBALL SIZE HAIL.

  SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. THIS TORNADO MAY BE   
           OBSCURED BY RAIN. DO NOT GO OUTSIDE TO LOOK FOR THE
           TORNADO!

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Omaha ASOS reporting 72 mph. Likely also with Hail.

With at least 1" hail

 

KOMA 032146Z 33045G57KT 1/2SM R14R/0300VP6000FT +TSRAGR FEW035 SCT050CB OVC095 15/14 A2985 RMK AO2 PK WND 34063/2140 RAB36GRB45 TSB16 CONS LTGICCG TS OHD-N MOV SE GR 1 P0000

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I was just a few miles west of the western edge of the Tornado Warning went it was first issued. Went east into Burwell and saw a bunch of scud and a relatively low cloud base, but that was it. Not very conclusive on radar either, but apparently it's been "confirmed."

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KOMA 032152Z 33040G50KT 1/4SM R14R/0700V1800FT +TSRAGR FEW035 OVC050CB 16/15 A2979 RMK AO2 PK WND 34063/2140 RAB36GRB45 TSB16 SLP086 CONS LTGICCG TS OHD-N MOV SE GR 1 P0115 T01560150
KOMA 032146Z 33045G57KT 1/2SM R14R/0300VP6000FT +TSRAGR FEW035 SCT050CB OVC095 15/14 A2985 RMK AO2 PK WND 34063/2140 RAB36GRB45 TSB16 CONS LTGICCG TS OHD-N MOV SE GR 1 P0000

 

1.15" of rain in 6 minutes, pretty impressive.

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I was just a few miles west of the western edge of the Tornado Warning went it was first issued. Went east into Burwell and saw a bunch of scud and a relatively low cloud base, but that was it. Not very conclusive on radar either, but apparently it's been "confirmed."

 

Watching these guys "Twisted Vortex Chasers" on TVN and they were on the CB radio looking at the hail shaft, screaming rain wrapped tornado.  I really hope this isn't the confirmed spotter report because it most certainly wasn't a tornado.  I watched them earlier get excited to be out of heavy rain and then they were wondering why hail was now falling.  Pretty comical and a guide on how not to chase imo.

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MESOSCALE DISCUSSION 0800
NWS STORM PREDICTION CENTER NORMAN OK
0454 PM CDT TUE JUN 03 2014

AREAS AFFECTED...CNTRL NEB

CONCERNING...TORNADO WATCH 207...209...

VALID 032154Z - 032330Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 207...209...CONTINUES.

SUMMARY...ONGOING TSTMS ARE EXPECTED TO PERSIST WITH A CONTINUED
THREAT OF VERY LARGE HAIL...DAMAGING WINDS IN EXCESS OF 65 KT...AND
TORNADOES. A FEW TORNADOES COULD BE STRONG...PARTICULARLY ACROSS
S-CNTRL NEB.

DISCUSSION...MESOANALYSIS AND SURFACE OBSERVATIONS REVEALS AN
ENVIRONMENT VERY FAVORABLE FOR SUPERCELLS OVER CNTRL NEB. KLNX RADAR
IMAGERY SHOWS AN OUTFLOW BOUNDARY EXTENDING S OF THE ONGOING
ACTIVITY IN HOOKER AND THOMAS COUNTIES...LIMITING THE TORNADO THREAT
WITH THOSE STORMS. LARGE HAIL AND DAMAGING WINDS ARE STILL POSSIBLE.

FARTHER E /CNTRL NEB/...SUPERCELL NEAR ODX CONTINUES TO SHOW STRONG
LOW-LEVEL ROTATION AND WDSS-II MESH NEAR 3 INCHES. THIS SUPERCELL IS
MOVING INTO A VERY FAVORABLE ENVIRONMENT CHARACTERIZED BY DEEP LAYER
SHEAR OF 60 KT...20 KT BACKED SURFACE WINDS...0-3 KM SRH OVER 600
M2/S2...DEWPOINTS IN THE MID 60S...AND MID-LEVEL LAPSE RATES NEAR 7
DEG C PER KM. EFFECTIVE-LAYER STP IS 12. ALL OF THESE FACTORS
INDICATE AN ENVIRONMENT CAPABLE OF SUPPORTING A STRONG TORNADO. IT
APPEARS THE ONGOING SUPERCELL WILL HAVE A HIGH PROBABILITY OF
PRODUCING A STRONG TORNADO AS LONG AS THE IT CAN REMAIN
SEMI-DISCRETE AND AVOID NEGATIVE STORM INTERACTIONS.

ANY ADDITIONAL DEVELOPMENT S OF THE ONGOING STORMS /SUCH AS THE
RECENT UPDRAFT IN CUSTER COUNTY/ IN THIS FAVORABLE ENVIRONMENT WOULD
LIKELY BE SUPERCELLULAR AS LONG AS IT CAN REMAIN DISCRETE.

..MOSIER.. 06/03/2014

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I was just a few miles west of the western edge of the Tornado Warning went it was first issued. Went east into Burwell and saw a bunch of scud and a relatively low cloud base, but that was it. Not very conclusive on radar either, but apparently it's been "confirmed."

We all know how reliable that has been the last few weeks...

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Watching these guys "Twisted Vortex Chasers" on TVN and they were on the CB radio looking at the hail shaft, screaming rain wrapped tornado.  I really hope this isn't the confirmed spotter report because it most certainly wasn't a tornado.  I watched them earlier get excited to be out of heavy rain and then they were wondering why hail was now falling.  Pretty comical and a guide on how not to chase imo.

 

Lol I was watching the same thing and thinking it must have been them, even though we all saw that there was definitely no tornado even by their account. But then I wasn't sure if they posted here or something...

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KOMA 032152Z 33040G50KT 1/4SM R14R/0700V1800FT +TSRAGR FEW035 OVC050CB 16/15 A2979 RMK AO2 PK WND 34063/2140 RAB36GRB45 TSB16 SLP086 CONS LTGICCG TS OHD-N MOV SE GR 1 P0115 T01560150

KOMA 032146Z 33045G57KT 1/2SM R14R/0300VP6000FT +TSRAGR FEW035 SCT050CB OVC095 15/14 A2985 RMK AO2 PK WND 34063/2140 RAB36GRB45 TSB16 CONS LTGICCG TS OHD-N MOV SE GR 1 P0000

 

1.15" of rain in 6 minutes, pretty impressive.

 

KOMA 032200Z 33012G22KT 1SM R14R/1400VP6000FT +TSRA FEW003 BKN017 OVC043CB 17/16 A2975 RMK AO2 GRE2158GSB2158E00 FRQ LTGICCG TS OHD-SE MOV SE P0109 T01670161

 

Add on another 1.09, so 2.24" in 14 minutes, there is going to be a big time flooding issue as it looks like the storms to the west are going to ride the warm front right over the same areas.

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Another situation of a velocity couplet crossing a CWA boundary

today, with strong rotation near Macedonia IA.

 

That storm pretty much has it all. Likely some very strong wind speeds on the leading edge, monster hail imbedded in there, and strong rotation in the middle...

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I don't like how that cell has evolved from how it was in the Omaha-Council Bluffs area to where it is now in northern Montgomery/southern Cass Counties. for a time it also has a creepy S-signature there in the reflectivity. I hope anyone trying to chase that storm is very careful.

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