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Significant Severe Events: June 14th-19th


andyhb

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On another note, the elevated junk in NE/EC NEB has really struggled... amazing that it hasn't exploded given the environment, even if it is on the cool side of the OFB.

 

Capping appears to be still holding it down but the cu field in NE is very agitated on vis sat.

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15% tor probs with very strong wording added.

 

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0258 PM CDT MON JUN 16 2014

VALID 162000Z - 171200Z

...THERE IS A MDT RISK OF SVR TSTMS SERN SD AND PARTS OF ERN NEB
THROUGH SRN MN...NRN/CNTRL IA INTO SWRN WI...

...THERE IS A SLGT RISK OF SVR TSTMS PARTS OF THE NRN AND CNTRL
PLAINS INTO MID-UPPER MIDWEST...

...SUMMARY...
SEVERE THUNDERSTORMS CAPABLE OF POTENTIALLY WIDESPREAD DAMAGING
WIND...VERY LARGE HAIL AND TORNADOES...WILL OCCUR TODAY INTO TONIGHT
FROM PARTS OF SOUTHEAST SOUTH DAKOTA AND CENTRAL AND EASTERN
NEBRASKA EASTWARD ACROSS MUCH OF IOWA...SOUTHERN MINNESOTA...INTO
WISCONSIN. OF PARTICULAR CONCERN WILL BE FROM PORTIONS OF NORTHEAST
NEBRASKA INTO ADJACENT PARTS OF SOUTH DAKOTA AND IOWA THAT AFTERNOON
AND EVENING...WHERE A FEW SIGNIFICANT AND/OR A VIOLENT TORNADO IN
ADDITION TO LARGE...DAMAGING HAIL AND WINDS WILL BE POSSIBLE.


...NRN/CNTRL PLAINS INTO UPPER MIDWEST THROUGH TONIGHT...

MOST OF THE ONGOING FORECAST REMAINS ON TRACK. THE SLIGHT RISK HAS
BEEN EXTENDED INTO PORTIONS OF W-CENTRAL INTO CENTRAL IL. REF MCD
1016 FOR MORE DETAILS. ADDITIONALLY...TORNADO THREAT APPEARS TO BE
INCREASING ACROSS PORTION OF NEB/FAR SE SD AND ADJACENT PORTIONS OF
IA. REF MCD 1015 FOR MORE DETAILS. 19Z OBSERVED RAOB FROM OAX
INDICATES STRONG LOW LEVEL SHEAR WITH LARGE CYCLONICALLY CURVED
HODOGRAPH AND EXTREME INSTABILITY. WITH THE ADDED FOCUS OF AN
OUTFLOW BOUNDARY FROM EARLIER CONVECTION...SEVERAL SIG TORS AND/OR A
VIOLENT TORNADO CAN NOT BE RULED OUT. AS SUCH...UPGRADE TO 15% SIG
TORNADO PROBABILITIES APPEAR WARRANTED.


ELSEWHERE...NO CHANGES WERE MADE.

..LEITMAN.. 06/16/2014

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90/80 tornado probs on that watch...

 

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 303
NWS STORM PREDICTION CENTER NORMAN OK
310 PM CDT MON JUN 16 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
WEST-CENTRAL IOWA
NORTH-CENTRAL AND NORTHEAST NEBRASKA

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 310 PM UNTIL
1000 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES AND A FEW INTENSE TORNADOES LIKELY
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 3 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH SOUTHWEST OF
AINSWORTH NEBRASKA TO 20 MILES EAST NORTHEAST OF TEKAMAH
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 302...

DISCUSSION...THE 19Z OMA SOUNDING SAMPLED A VOLATILE ENVIRONMENT
WITH 4000 J/KG MLCAPE...60 KT OF EFFECTIVE BULK SHEAR...AND 500
EFFECTIVE SRH. ISOLATED TO WIDELY SCATTERED SUPERCELLS ARE EXPECTED
TO DEVELOP ALONG HEATED OUTFLOW BOUNDARIES WITH A RISK FOR VERY
LARGE HAIL AND DAMAGING TORNADOES...A FEW OF WHICH COULD BE
SIGNIFICANT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 23025.


...MEAD
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This setup has quickly escalated to one of the most impressive mesoscale setups I can ever recall.  You've got a leftover boundary, 30-40 kt of flow at 850 hPa, CAPE profiles larger than a wooly mammoth, effective SRH of 300-400 m^2/s^2, and a cluster of cells about ready to consolidate and take advantage of that parameter space all by itself.

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