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June 16-25 Severe threat


snowlover2

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models are pretty consistent in showing development in N. IA later this evening and riding it southeast into N. IL / S. WI fueled by the LLJ. If anything there may be a potential enhanced heavy rain / training thread on areas that see a couple rounds.

 

 

Flooding would definitely be a concern in that scenario.  Additional development farther west looks likely later on and it's more a question of where it goes...is it much like last night or does it end up being more of a northern IL/IN thing? 

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That's a pretty impressive sounding, all things considered.

 

Yep. So very close to storm initiation, but that weak cap just isn't budging. 

 

The best threat should shift into OH/IN though (if nothing initiates), as the MCV subsidence bubble rotates into here.

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Wisconsin's tornado drought officially over

PRELIMINARY LOCAL STORM REPORT...CORRECTED  NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI  242 PM CDT TUE JUN 17 2014     .TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON     .DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE.                ..REMARKS..    1141 PM     TORNADO          4 NE BLANCHARDVILLE     42.85N 89.80W   06/16/2014  F1               GREEN              WI   NWS STORM SURVEY                TORNADO DAMAGE TO FARMSTEADS ALONG HAY HOLLOW ROAD IN               NORTHWEST GREEN COUNTY. NUMEROUS LARGE TREES DOWN.                             PRELIMINARY RATING OF EF1 WITH WINDS SPEEDS UP TO 95 MPH.  
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Flooding would definitely be a concern in that scenario.  Additional development farther west looks likely later on and it's more a question of where it goes...is it much like last night or does it end up being more of a northern IL/IN thing? 

 

probably going to depend on the LLJ orientation, it looks increasingly likely like the day time heating and best instability will be shunted south of what the models were selling ealier this morning.

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RC's take

 

.....

AREA FORECAST DISCUSSION  NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  304 PM CDT TUE JUN 17 2014     DISCUSSION    303 PM CDT    NEAR TERM MESOSCALE DISCUSSION...THIS AFTERNOON THROUGH TONIGHT    PRIMARY CONCERN IS CONVECTIVE TRENDS. ADMITTEDLY A LOW CONFIDENCE   FORECAST. MAIN PLAYERS ON THE FIELD ARE REMNANT OUTFLOW BOUNDARY   FROM LAST NIGHT'S CONVECTION THAT IS STALLED JUST SOUTH OF THE I-80   CORRIDOR AND A MIDLEVEL WAVE ACROSS THE CENTRAL PLAINS.    LATEST MESOANALYSIS SHOWS WEAKLY CAPPED TO UNCAPPED STRONG 3000-4000   J/KG MLCAPE SOUTH OF THE REMNANT OUTFLOW BOUNDARY WITH TEMPERATURES   IN LOW 90S AND DEWPOINTS AROUND 70/LOW 70S. WHILE THE REMAINDER OF   THE REGION NORTH OF THE BOUNDARY AND BACK TO THE PLAINS FEATURES   MODERATE TO STRONG INSTABILITY BUT STILL A GOOD AMOUNT OF CAPPING.     CONVERGENCE ALONG THE OUTFLOW BOUNDARY HAS RESULTED IN BLOSSOMING CU   FIELD THAT HAS SHOWN SOME AGITATION. WILL HAVE TO MAKE A LAST MINUTE   DECISION BASED ON OBSERVATIONAL TRENDS FOR LATE AFTERNOON POPS IN   THAT AREA. IF ANY CONVECTION CAN INITIATE...TREND IS FOR SLIGHTLY   INCREASED WESTERLY MIDLEVEL FLOW LATE THIS AFTERNOON THAT WOULD   RESULT IN INCREASED EFFECTIVE BULK SHEAR AND SUPPORT A SEVERE   THREAT. PRIMARY THREATS WOULD BE WIND AND HAIL GIVEN HIGH LEVELS OF   DCAPE AND STEEP MIDLEVEL LAPSE RATES.    CONCERN LATER THIS EVENING THEN SHIFTS TO POTENTIAL FOR MIDLEVEL   WAVE OVER PLAINS INITIATING CONVECTION OVER NORTHERN IA/SOUTHERN MN   AND CELLS OR CLUSTERS. THESE WOULD THEN MERGE INTO AN MCS/ORGANIZED   CLUSTERS THAT THEN PROPAGATE SOUTHEAST ALONG INSTABILITY   GRADIENT/850-300 MB THICKNESS. FWD PROPAGATING CORFIDI VECTORS ALSO   FAVOR SOUTHEASTWARD MCS MOVEMENT. HAVE INDICATED LIKELY POPS   SPREADING IN FROM NORTHWEST LATER THIS EVENING...BUT FOCUS FOR   LIKELIES WILL STILL REMAIN GENERALLY NORTH OF INTERSTATE 80.     THE EXPECTED INITIATION AREA LOOKS PRIMARILY STABLE ON VISIBLE   SATELLITE AT THE TIME OF THIS WRITING...SO WOULD LIKE TO HAVE HIGHER   CONFIDENCE BEFORE INCREASING POPS TO CATEGORICAL. IT IS DISTINCTLY   POSSIBLE THAT MAIN FOCUS FOR CONVECTION TONIGHT WILL REMAIN IN THE   FAR NORTHERN CWA AND NORTH OF THE STATE LINE TONIGHT. 30-40 KT DEEP   LAYER SHEAR AND AVAILABLE INSTABILITY WOULD SUPPORT A WIND AND   POSSIBLY HAIL THREAT WITH ANY MCS TONIGHT. AND JUICY HIGH PWAT AIR   MASS WILL FAVOR HEAVY DOWNPOURS...THOUGH SINCE BULK OF RAIN WAS OVER   WI LAST NIGHT...NOT EXPECTING A WIDESPREAD FLOOD THREAT.   ANTICIPATING OVERNIGHT LOWS IN THE LOW-MID 70S.    REMAINDER OF DISCUSSION TO FOLLOW.    RC  
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Pretty sure that particular one had some lead time but things were happening fast and I could be wrong.

No that one went unwarned for tornadoes while having a TDS for 3 scans, it wasn't until after it hit Verona. The one that was on the east side of Madison was warned, although we have yet to hear their findings with that one though there was damage.

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The tornado warning for Verona went out at 11:51 PM and was valid until 12:15 AM.  We'll see what time they go with for touchdown but it appears Verona was hit ~12:10 AM.  Unless we had a continuous track from Green county into Dane county, doesn't it mean the warning technically was issued in advance?

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MKX is claiming it was warned in advance using those time frames, since Verona was in the first polygon warning. I tend to agree though that storm had moved past Verona at that point and this was a new storm/unwarned until touchdown. Fire Departments were being dispatched to tornado damage before the warning was activated at least.

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The tornado warning for Verona went out at 11:51 PM and was valid until 12:15 AM.  We'll see what time they go with for touchdown but it appears Verona was hit ~12:10 AM.  Unless we had a continuous track from Green county into Dane county, doesn't it mean the warning technically was issued in advance?

 

I know there was a discontinuity between 2 warnings and I believe the tornado warning polygon didn't include Verona in the first one if I remember correctly. I know several of us were up in arms last night because of their miss.

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