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June 16-25 Severe threat


snowlover2

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EF3 tornado confirmed in Verona, WI and I believe that was unwarned.

 

https://twitter.com/NWSMKX/status/478999990246068224

 

It wasn't warned initially but it did eventually get warned. I live about 5 miles north of the suspected track and I was watching it on radar. I recall looking the BV and SRV images thinking they should warn it about 15 minutes before they did but they did eventually warn it. Would have liked to see them do it sooner though. It was not warned as it was directly south of us.

 

Interestingly, things were rather muted here. Lots of rain and thunder but the winds were not impressive from what I could see. We are in a pretty heavily wooded area so it may have just been hard to tell.

 

Either way, I was surprised to wake up to the damage reports. I suspected they may find that a tor touched down but would not have guessed an EF3.

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Looks like a cell up around Morton Grove trying to take off. May skirt just north of you.

 

 

it literally went up over my head and pushed north, along with my storm chances for the rest of the night

 

On to tomorrow.

 

FWIW some of the early morning HRRR runs did well

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Couple small cells moving across RFD right now. CU just to my south.

 

MKX disco:

 

 

000
FXUS63 KMKX 180120
AFDMKX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
820 PM CDT TUE JUN 17 2014

.UPDATE...
VISIBLE SATELLITE IMAGERY IS SHOWING DEEPENING CONVECTION
BEGINNING TO OCCUR ACROSS NCNTRAL IA INTO SE MN AND WC WI. THIS
DEEPENING ASCENT IS ASSOCIATED WITH THE NOSE OF THE LOW LEVEL JET.
THE EVENING RAOB OUT OF KDVN SHOWS A STRONG CAP JUST BELOW 700MB
WHICH IS LIMITING CONVECTION AT THIS TIME. THAT CAP IS WEAKER TO
THE NORTH AND IS WHY WE/RE SEEING THE FIRST CONVECTION UP AROUND
WAUSAU. A DECENT MID LEVEL SHORT WAVE OVER NEB WILL EVENTUALLY
ROLL ACROSS WISCONSIN TONIGHT. THIS SHORT WAVE WILL ENHANCE THE
DEEP CONVECTION AND LIKELY WIPE OUT THE INVERSION. THE SCENARIO WE
EXPECT FOR TONIGHT IS FOR CONVECTION TO FIRE ACROSS SOUTHEAST MN
OR FAR NE IA...THEN ROLL EAST SOUTHEAST ACROSS SOUTHERN WISCONSIN.
SEVERE WEATHER IS EXPECTED WITH SOME OF THESE STORMS WITH THE MAIN
THREAT BY THE TIME IT GETS HERE BEING LARGE HAIL AND STRONG WINDS.
LIKE LAST NIGHT...ISOLATED TORNADOES ARE POSSIBLE. THE MAIN SHOW
SHOULD BE FROM JUST BEFORE MIDNIGHT...THROUGH THE ENTIRE NIGHT.
TORRENTIAL RAIN IS ALSO EXPECTED AND COUPLED WITH SATURATED
CONDITIONS FROM LAST NIGHT/S RAINFALL...THE FLASH FLOOD THREAT HAS
INCREASED.

 

 

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Lol you do realize the boundary is already retreating back north?

 

Dewpoints and instability have actually dropped within the last few hours here, which tells me the front actually moved to the south for us locally. The SPC mesoanalysis reflects this, as the winds have flipped to the WNW. 

 

Now how fast it retreats back north of us (if it does at all to put us in line for severe weather) will depend on how the convection upstream behaves. Most of the models keep the instability axis just to our SW tomorrow.

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Dewpoints and instability have actually dropped within the last few hours here, which tells me the front actually moved to the south for us locally. The SPC mesoanalysis reflects this, as the winds have flipped to the WNW. 

 

Now how fast it retreats back north of us (if it does at all to put us in line for severe weather) will depend on how the convection upstream behaves. Most of the models keep the instability axis just to our SW tomorrow.

 

Yes instability dropped off here but just south of here at the border there is ample instability, it won't take much for the boundary to rise back to the north especially since it is already retreating back on the west side of the state.

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We got brushed by two different developing cells today, but only enough to wet the surface even though the downpours were extreme for about one or two minutes each. We need some real rain here since locally it is very dry right now, so I'm not hoping for any severe weather per se, but any downpours are appreciated.

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Cell now warned in Walworth County, WI.

 

 

SEVERE THUNDERSTORM WARNING
WIC059-101-127-180400-
/O.NEW.KMKX.SV.W.0053.140618T0321Z-140618T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1021 PM CDT TUE JUN 17 2014

THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN RACINE COUNTY IN SOUTHEAST WISCONSIN...
WEST CENTRAL KENOSHA COUNTY IN SOUTHEAST WISCONSIN...
CENTRAL WALWORTH COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 1100 PM CDT

* AT 1021 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER DELAVAN
LAKE...MOVING NORTHEAST AT 25 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
TO ROOFS...SIDING AND TREES.

 

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AREA FORECAST DISCUSSION  

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL  

1005 PM CDT TUE JUN 17 2014  

   

MESOSCALE DISCUSSION  

 

957 PM CDT  

 

STILL NOT A TON OF CONFIDENCE IN CONVECTIVE EVOLUTION OVERNIGHT.  

DIFFUSE WARM FRONT STRETCHES FROM NEAR CHICAGO WHERE IT IS  

CONJOINED WITH A LAKE BREEZE WEST TO NORTHEAST NEBRASKA. AREA 88D  

VWPS SHOW 25-30KT LOW LEVEL JET ALREADY BEGINNING TO DEVELOP WITH  

ISENTROPIC ASCENT ASSOCIATED WITH THIS WAA RESULTING IN ISOLATED  

STORMS DEVELOPING FROM EAST CENTRAL IOWA EAST ACROSS FAR NORTHERN  

ILLINOIS JUST TO THE NORTH OF THE WARM FRONT. HAVE BEEN STARING AT  

SATELLITE IMAGERY THIS EVENING AND CANNOT FIND ANY IDENTIFIABLE  

SHORTWAVE OR FEATURE TO REALLY FOCUS CONVECTIVE DEVELOPMENT THIS  

FAR EAST OVERNIGHT WITH AT LEAST A SOMEWHAT DISTINGUISHABLE  

SHORTWAVE OVER EASTERN NEBRASKA.  

 

EVENING ROABS SHOWED PRESENCE OF VERY STEEP LAPSE RATES OVER TOP A  

VERY MOIST LOW LEVELS WITH POTENTIALLY EXPLOSIVE INSTABILITY...BUT  

WITH FORMIDABLE CAPPING INVERSION AT THE BASE OF THE EML. AS LOW  

LEVEL JET INTENSIFIES WOULD EXPECT COVERAGE AND INTENSITY OF  

STORMS NORTH OF THE WARM FRONT TO INCREASE AND INSTABILITY  

RESPECTABLE SHEAR THE POTENTIAL WOULD EXIST FOR LARGE HAIL  

INITIALLY WITH THREAT TRANSITIONING MORE TOWARD DAMAGING WIND IF  

COLD POOL AND ASSOCIATED MCS WERE TO ORGANIZE. REALLY NOT SEEING  

ANY CLEAR SIGNALS WHERE MCS WILL ORGANIZE YET...BUT WHEN/IF ONE  

DOES THE LARGE DCAPE VALUES AND SHEAR WOULD FAVOR COLD POOL  

DEVELOPMENT WITH BOTH FORWARD PROPAGATING AND UPWIND PROPAGATING  

CONVECTION. THE DAMAGING WIND THREAT WOULD BE CONFINED MORE TOWARD  

THE FORWARD PROPAGATING PORTION OF THE MCS WITH UPSTREAM  

INSTABILITY AND MOISTURE AND CORFIDI VECTORS FAVORING UPWIND OR  

BACKWARD PROPAGATION OF THE TRAILING CONVECTION AND A POTENTIAL  

FOR VERY HEAVY RAINFALL AND FLASH FLOODING. AT THIS  

POINT...CONFIDENCE IN HOW THINGS UNFOLD IS TOO LOW TO ISSUE A  

FLASH FLOOD WATCH...BUT OTHER THAN LACK OF CLEARLY DEFINED  

SHORTWAVE THE SYNOPTIC PATTERN IS VERY FAVORABLE FOR FLASH  

FLOODING.  

 

ONLY REAL CHANGE TO GOING FORECAST IS TO TWEAK POPS TO FOCUS EVEN  

MORE ON OUR NORTHERN CWA NORTH OF THE WARM FRONT WITH THE BEST  

SHOT OF ANYTHING SOUTH OF THE WARM FRONT HINGING ON THE  

DEVELOPMENT OF STRONG COLD POOL. BUT STRONGER CAPPING INVERSION  

SHOULD GENERALLY LIMIT SOUTHWARD EXTENT OF THE CONVECTION.  

 

IZZI  

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