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June 22-23 Severe Weather Outbreak


Stebo

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The MCS is still in the area at the time, so lack of surface based instability makes sense in the context of that particular model.

Ok yes that makes sense. See they made it seem like this was after the MCS has passed and there is 0 instability (aka NO RECOVERY)
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Seems like any low,mid, or upper level clouds leftover would be blown out of the area very quickly as well due to the VERY strong wind fields at all levels... So residual clouds probably wont be much of a problem after it moves through, whenever that is.

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Forecasting in the Lakes/MW would sure be easier if we didn't have to clean up the Plains scraps all the time lol.  

 

Down this way I'm still thinking some monster HPs could pop along the trailing cold front, especially where any outflow boundaries from the early crap intersect the front.  

 

Indeed, lol.

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Seems like any low,mid, or upper level clouds leftover would be blown out of the area very quickly as well due to the VERY strong wind fields at all levels... So residual clouds probably wont be much of a problem after it moves through, whenever that is.

Yep, Im still rooting for the MDT hahaha
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Seems like any low,mid, or upper level clouds leftover would be blown out of the area very quickly as well due to the VERY strong wind fields at all levels... So residual clouds probably wont be much of a problem after it moves through, whenever that is.

Did you ever think that those strong winds might cause ascent that results in more clouds forming?

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Kinda lame discussion.. lol

...THERE IS AN ENH RISK OF SVR TSTMS ACROSS SRN ND AND SD INTO SWRN  

MN AND NWRN IA...  

 

...THERE IS A SLGT RISK OF SVR TSTMS FROM THE NRN PLAINS INTO THE  

LOWER MO AND LOWER OH VALLEYS...  

 

...THERE IS A MRGL RISK OF SVR TSTMS OVER PARTS OF THE NRN HIGH  

PLAINS SEWD THROUGH THE MIDWEST AND INTO THE CNTRL APPALACHIANS...  

 

CORRECTED FOR 10 PERCENT THUNDER LINE OVER NM  

   

..SUMMARY  

 

CLUSTERS OF SEVERE STORMS CAPABLE OF VERY LARGE  

HAIL...TORNADOES...AND DAMAGING WINDS ARE PROBABLE THIS EVENING OVER  

THE NORTHERN GREAT PLAINS. AN ORGANIZED SEVERE STORM COMPLEX  

ACCOMPANIED BY A SIGNIFICANT SEVERE-WIND THREAT WILL PROBABLY  

DEVELOP LATER TONIGHT OVER THE NORTHERN GREAT PLAINS AND MOVE INTO  

THE UPPER MIDWEST. ISOLATED STRONG TO SEVERE STORMS WILL BE  

POSSIBLE MAINLY EARLY THIS EVENING OVER THE LOWER MISSOURI VALLEY TO  

THE CENTRAL APPALACHIANS.  

   

..NRN PLAINS INTO THE UPPER MIDWEST  

 

A SHORTWAVE TROUGH OVER NRN MT THIS EVENING WILL QUICKLY MOVE EWD  

WITHIN A BELT OF 50-70 KT MID-LEVEL WLY FLOW LOCATED OVER THE NRN  

TIER OF STATES. AN AREA OF LOW PRESSURE OVER THE NRN HIGH PLAINS  

WILL DEVELOP EWD INTO SD LATE TONIGHT. A RICH LOW-LEVEL MOISTURE  

RESERVOIR LOCATED OVER THE LOWER TO MID MO VALLEY WILL ADVECT NWD ON  

THE NOSE OF A STRONG 50+ KT SLY LLJ AND CONTRIBUTE TO STRONG  

DESTABILIZATION OVER SD DESPITE THE LOSS OF DAYTIME HEATING. THE  

22/00Z N-CNTRL PLAINS RAOBS EXHIBITED AN EML WITH WARM H7 TEMPS /13  

DEG C ON THE RAP RAOB/ AND IT SEEMS THE STRONG LOW-LEVEL WAA REGIME  

FORECAST TO DEVELOP LATER TONIGHT WILL SUPPORT ADDITIONAL STORM  

DEVELOPMENT WITHIN THE MOIST AXIS OVER THE WRN DAKOTAS. THE STRONG  

VEERING AND STRENGTHENING WIND PROFILE WITH HEIGHT WILL BE CONDUCIVE  

FOR ORGANIZED SEVERE STORMS INCLUDING THE POSSIBILITY FOR A  

SUPERCELL TORNADO OR TWO...LARGE TO VERY LARGE HAIL AND SEVERE WIND  

GUSTS. ONCE THE EARLY EVENING ACTIVITY GROWS UPSCALE OR ADDITIONAL  

STORMS DEVELOP WITHIN THE WAA REGIME TONIGHT...A SIGNIFICANT SEVERE  

WIND GUST RISK WILL LIKELY UNFOLD. RECENT ITERATIONS OF  

CONVECTION-ALLOWING MODEL GUIDANCE INDICATE THE GREATEST POTENTIAL  

FOR A CORRIDOR OF HIGH WIND WILL FOCUS OVER SD AND EWD INTO SWRN MN  

BY EARLY MONDAY MORNING.  

   

..LOWER MO AND OH VALLEY  

 

WEAK WAA ATOP A CONVECTIVELY-REINFORCED BAROCLINIC ZONE WILL SUPPORT  

AN ISOLD TO SCTD STORM RISK THROUGH AT LEAST THE MID EVENING AS A  

VERY MOIST BOUNDARY LAYER --CHARACTERIZED BY SURFACE DEWPOINTS 70-75  

DEG F-- RESIDES IN THE REGION. STRONG INSTABILITY MAY YIELD SEVERAL  

STRONG TO SEVERE MULTICELLS CAPABLE OF A HAIL/WIND RISK TO PERSIST  

INTO THE EVENING OVER THE LOWER OH VALLEY. STRONGLY VEERED FLOW  

FARTHER NW OVER THE IA/MO VICINITY IS CONTRIBUTING TO SHEAR PROFILES  

SUPPORTIVE OF UPDRAFT ROTATION. A FEW OF THESE STORMS MAY CONTINUE  

TO POSE A LARGE HAIL/DMGG WIND GUST RISK INTO THE MID-LATE EVENING  

BEFORE DIMINISHING.  

 

..SMITH.. 06/22/2015  

 

That's from yesterday's outlook... 

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...THERE IS AN ENH RISK OF SVR TSTMS FROM THE MID-UPPER MS VALLEY
EWD INTO LOWER MICH...

...THERE IS A SLGT RISK OF SVR TSTMS OVER A LARGE PORTION OF THE
MIDWEST AND GREAT LAKES...

...THERE IS A MRGL RISK OF SVR TSTMS FROM ERN KS INTO THE
NORTHEASTERN U.S....

...THERE IS A MRGL RISK OF SVR TSTMS OVER NRN PARTS OF FL INTO THE
WRN CAROLINAS...

...SUMMARY...
SCATTERED SEVERE STORMS ARE LIKELY ACROSS PARTS OF THE UPPER
MISSISSIPPI VALLEY AND GREAT LAKES REGIONS...SOME OF WHICH SHOULD BE
INTENSE...MAINLY FROM MIDDAY THROUGH THE EVENING ON MONDAY. THE
THREAT FOR LARGE TO VERY LARGE HAIL AND A STRONG TORNADO APPEAR TO
BE GREATEST OVER SOUTHERN WISCONSIN AND NORTHERN ILLINOIS.

...UPPER MS VALLEY/GREAT LAKES...
CONSIDERABLE UNCERTAINTY REMAINS REGARDING THE FORECAST EVOLUTION OF
A SEVERE MCS ACROSS THE NRN PLAINS INTO THE UPPER MS VALLEY PRIOR TO
THE START OF THE PERIOD. AS A RESULT...CONFIDENCE FOR THIS SEVERE
FORECAST IS TEMPERED OWING TO SEVERAL POTENTIALLY CRITICAL VARIABLES
1) LONGEVITY/SEVERITY OF EARLY MORNING MCS FROM THE MS VALLEY INTO
THE GREAT LAKES 2) PREFERRED STORM MODE /SUPERCELL AND/OR BOW ECHO/.
GIVEN RELATIVELY HIGH UNCERTAINTY...WILL DEFER SUBSTANTIAL CHANGES
TO THE NEXT OUTLOOK.

THE PRIMARY SHORTWAVE TROUGH WILL MOVE FROM THE NRN PLAINS TO LAKE
SUPERIOR DURING THE DAY WHILE A POTENTIAL CONVECTIVELY-GENERATED MCV
EVOLVES FROM SQUALL LINE ACTIVITY LEADING INTO THE DAY 1 PERIOD. IN
THE LOW LEVELS...A RESERVOIR OF RICH MOISTURE OVER THE LOWER TO MID
MO VALLEY WILL ADVECT N/NEWD INTO THE MID MS VALLEY/WRN GREAT LAKES
DURING THE MORNING OWING PARTIALLY TO STRONG LOW-LEVEL WAA. WHILE
IT IS POSSIBLE FOR THE EARLY MORNING STORMS TO CONTINUE EWD FROM THE
MID-UPPER MS VALLEY INTO THE CNTRL GREAT LAKES...LESSENING BUOYANCY
WITH EWD EXTENT SHOULD SERVE TO WEAKEN THIS ACTIVITY. A STRONG
INFLUX OF LOW-LEVEL MOISTURE /CHARACTERIZED BY 16-18 G PER KG LOWEST
100 MB MEAN MIXING RATIOS/ WILL LIKELY MOVE INTO NRN IL/WI VICINITY
ALONG AND TO THE S OF TRAILING OUTFLOW AND AHEAD OF THE APPROACHING
COLD FRONT.

IT IS PROBABLE STORM REDEVELOPMENT /SCTD COVERAGE/ WILL OCCUR LATER
IN THE AFTERNOON NEAR THE RESIDUAL BOUNDARY OVER THE WRN GREAT LAKES
OR ALONG THE FRONT LOCATED OVER CNTRL WI SW INTO ERN IA. THE
STRENGTH OF THE DEEP LAYER SHEAR VECTOR /50-70 KT/ AND ITS
ORIENTATION TO THE BOUNDARY COUPLED WITH A VERY STRONG TO EXTREMELY
BUOYANT /3000-4500 J PER KG MLCAPE/ BOUNDARY LAYER WOULD PROMOTE
EXPLOSIVE UPDRAFT DEVELOPMENT AND A SUPERCELLULAR MODE EARLY IN THE
STORM LIFECYCLE. ALL SEVERE HAZARDS WOULD BE POSSIBLE WITH THIS
ACTIVITY...INCLUDING SIGNIFICANT HAIL/WIND/TORNADO. FURTHER STORM
DEVELOPMENT ALONG THE FRONT WILL FAVOR A TRANSITION TO A MIXED MODE
AND PROBABLY YIELD A WIND/HAIL THREAT BECOMING PREDOMINATE WITH
TIME. STORMS SHOULD MOVE DOWNSTREAM AND INTO THE SRN AND LOWER
GREAT LAKES STATES OVERNIGHT WITH THE PRIMARY RISK BEING ISOLD LARGE
HAIL/WIND.

...PARTS OF THE SERN U.S...
A FLATTENED MID-LEVEL ANTICYCLONE WILL PERSIST OFF THE SE U.S. AND
DIURNALLY-DRIVEN STORMS WILL LIKELY DEVELOP DURING THE AFTERNOON. A
VERY WEAK WIND PROFILE WILL RESULT IN SLOW-MOVING PULSE STORMS WHICH
WILL LIKELY PROPAGATE ON CONVECTIVE OUTFLOW. STEEPENED LOW-LEVEL
LAPSE RATES OWING TO STRONG DIABATIC HEATING COUPLED WITH PW
1.75-2.0 INCHES WILL PROMOTE WATER LOADING WITH THE MORE INTENSE
CORES. WET MICROBURSTS CAPABLE OF POCKETS OF WIND DAMAGE WILL BE
THE PRIMARY THREAT AND THIS ACTIVITY WILL DIMINISH DURING THE EARLY
EVENING.

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This is pretty much the TAKE NO RISKS outlook

SPC usually says it how it is... If there is a lot of uncertainty with what could be a potentially high-end event, this is what they do, defer to later updates.

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