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June 16th-? Severe Thread


wisconsinwx

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BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LINCOLN IL 739 PM CDT SAT JUN 16 2012 THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL KNOX COUNTY IN WEST CENTRAL ILLINOIS... NORTHWESTERN PEORIA COUNTY IN CENTRAL ILLINOIS... STARK COUNTY IN NORTH CENTRAL ILLINOIS... * UNTIL 830 PM CDT. * AT 734 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR WILLIAMSFIELD...OR 19 MILES EAST OF GALESBURG...AND MOVING NORTHEAST AT 30 MPH. * LOCATIONS IMPACTED INCLUDE... LAURA...WEST JERSEY...TOULON...WYOMING...CASTLETON...BRADFORD... MONICA AND DUNCAN.

QLCS type line segment rotation?

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BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE LINCOLN IL 739 PM CDT SAT JUN 16 2012 THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL KNOX COUNTY IN WEST CENTRAL ILLINOIS... NORTHWESTERN PEORIA COUNTY IN CENTRAL ILLINOIS... STARK COUNTY IN NORTH CENTRAL ILLINOIS... * UNTIL 830 PM CDT. * AT 734 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR WILLIAMSFIELD...OR 19 MILES EAST OF GALESBURG...AND MOVING NORTHEAST AT 30 MPH. * LOCATIONS IMPACTED INCLUDE... LAURA...WEST JERSEY...TOULON...WYOMING...CASTLETON...BRADFORD... MONICA AND DUNCAN.

QLCS type line segment rotation?

Yep., I think so. What a spurious warning. Looked like rotation on one scan, then disappeared.

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BULLETIN - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

1129 PM CDT SAT JUN 16 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

NORTHERN MILWAUKEE COUNTY IN SOUTHEAST WISCONSIN...

SOUTHWESTERN OZAUKEE COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL MIDNIGHT CDT

* AT 1127 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS

OF 60 MPH. THIS STORM WAS LOCATED NEAR MILWAUKEE TIMMERMAN

AIRPORT...OR NEAR BROWN DEER...AND MOVING NORTHEAST AT 30 MPH.

PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...

BROWN DEER...GLENDALE...MEQUON...THIENSVILLE...FOX POINT...BAYSIDE

AND RIVER HILLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER

HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR

YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR

HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE

INTO AREAS WHERE WATER COVERS THE ROAD.

This is the sixth severe warning this year for at least part of the county. Not bad for an off severe weather year.

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ARX talking about where these expected thunderstorms might travel.

THE FOCUS THEN GOES TO TONIGHT WHERE AN MCS IS EXPECTED TO TRACK

ACROSS MINNESOTA AND WISCONSIN. THIS TRACK IS HIGHLY DEPENDENT

UPON WHERE CONVECTION INITIATES THIS AFTERNOON AHEAD OF THE

SECOND AND MORE POTENT MID LEVEL TROUGH MOVING ACROSS SOUTH

CENTRAL CANADA AND THE DAKOTAS. THE TREND IN THE 17.12Z GUIDANCE

HAS BEEN TO SHIFT THIS INITIATION AREA A BIT FURTHER TO THE NORTH

DUE TO A STRONG 800MB CAPPING INVERSION THAT HAS ADVECTED NORTHWARD

TODAY. THE EXPECTATION IS THAT CONVECTION WILL FORM IN THE

VICINITY OF WHERE THE WARM FRONT MEETS UP WITH THE SURFACE LOW AND

QUICKLY ORGANIZE INTO SUPERCELLS IN WEST CENTRAL MINNESOTA WHERE

NORTH DAKOTA MEETS SOUTH DAKOTA. AFTER A BRIEF PERIOD AS

SUPERCELLS...THESE STORMS WILL CONGEAL INTO A MESOSCALE CONVECTIVE

SYSTEM AND RACE TO THE EAST SOUTHEAST ALONG THE NOSE OF THE LOW

LEVEL JET AND INSTABILITY AXIS. CORFIDI VECTORS WOULD SUGGEST MORE

OF A SOUTHEAST TRACK ALONG THIS LLJ AND 800MB CAP...BUT THE 17.12Z

NAM/GFS SUGGEST MORE OF AN EASTWARD TRACK TO THE SYSTEM GOING FROM

CENTRAL MINNESOTA INTO NORTHERN WISCONSIN.

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God, if the NAM has anything to say, WI, the UP, and the nrn LP of MI have one hell of a day ahead on Monday. Even with low-level moisture probably too high, yikes.

The NAM is not the only model I've seen that paints over 3000 J/KG of SBCAPE, although I think the northern half of Wisconsin will be more under the gun due to better forcing. Certainly if this MCS sweeps through quickly enough to destabilize these N GL areas, any modes of severe are possible.

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This MCS has one large cloud canopy!

ECI7.JPG

Edit:

MKX expecting this MCS to turn more right into the forecast area.

000

FXUS63 KMKX 180214 AAA

AFDMKX

AREA FORECAST DISCUSSION...UPDATED

NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

914 PM CDT SUN JUN 17 2012

.UPDATE...ADDED PARAGRAPH ON MONDAY WINDS.

INCREASING THETA-E ADVECTION ACROSS EASTERN IOWA

TRIGGERING SCATTERED SHOWERS AND THUNDERSTORMS. SEE NO REASON WHY

THIS WOULD NOT CONTINUE INTO SOUTHERN WI AS LOW LEVEL FLOW

INCREASES SO WL ADD SCT/CHC MENTION IN FOR THE LATE EVENING TO

SOUTH CENTRAL WI...AND SPREAD THE CHANCE EWD LATER IN THE NIGHT.

FOCUS IS ON IMPRESSIVE MESO-SCALE CONVECTIVE SYSTEM MOVING THROUGH

CENTRAL MN ATTM. THIS IS EXPECTED TO TRANSITION TO MORE WIND/HEAVY

RAIN EVENT AS IT PROGRESSES EWD DURING THE EVENING. MOST SHORT

TERM GUIDANCE AND MESO-SCALE MODELS MOVE THE MCS EWD ACROSS NRN

HALF OF WI AFTER MIDNIGHT. HOWEVER 12Z 4KM WRF-NMM APPEARS TO BE

HANDLING CURRENT CONVECTION BETTER THAN HRRR AND WRF-ARW. THE WRF-

NMM MOVES THE CONVECTION INTO THE NORTHWEST HALF OF THE CWA

BETWEEN 09Z AND 12Z. THIS COULD VERY WELL HAPPEN AS THIS AREA MAY

BE THE LOCATION OF THE GREATEST SYSTEM-RELATIVE CONVERGENCE WHEN

TAKING INTO ACCOUNT WINDS AND MOISTURE. IN ADDITION...CORFIDI

VECTORS FOR LATE TONIGHT FROM BOTH GFS AND NAM ARE FROM THE N TO

NW AROUND 30KTS.

NSSL 4KM WRF SYNTHETIC IMAGERY DEPICTS CONVECTION AND COLDEST

CLOUD TOPS SLIGHTLY SOUTH OF CURRENT CONVECTION IN WRN

MN/NORTHEAST SODAK. SYNTHETIC IMAGERY CARRIES MCS INTO SOUTH

CENTRAL WI LATE TNGT AS IT WEAKENS. FOR NOW WL KEEP LIKELY WORDING

IN THE NORTHWEST LATE TONIGHT WITH EITHER SCT/CHC ELSEWHERE.

EXPECT ANY OUTFLOW BOUNDARY AND CLOUDS FROM MORNING CONVECTION TO

THIN AND WEAKEN BY AFTERNOON. STRONG MIXING DURING THE AFTERNOON

SHOULD ALLOW WINDS TO REACH 15 TO 25 KTS SUSTAINED LEVELS WITH

GUSTS AS HIGH AS 40 KTS. MAY GET CLOSE TO WIND ADVISORY CRITERIA

AT TIMES...BUT TOO MUCH UNCERTAINTY AT THIS POINT TO DO MORE THAN

MENTION IN HWO. BUMPED UP WINDSPEEDS IN GRIDS/ZFP.

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You guys keep complaining, but I'm pretty happy with what I see right now. The MCS is bowing out right towards Oakland county, so even if they're sub severe the strongest winds should hit here. And the suddenly weakening radar returns might be more due to it getting closer to the radar then actually weakening. Either way, its better then anything I was expecting to see when I woke up this afternoon.

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Funny watching the MCS **** the bed before it hits. Well I guess 90 isnt off the table. Can't win em all.

I think the high temps are going to bust low for the eastern half of lower MI today. There's more storms organizing east of Ludington so there's a possibility of another round for you later on.

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You guys keep complaining, but I'm pretty happy with what I see right now. The MCS is bowing out right towards Oakland county, so even if they're sub severe the strongest winds should hit here. And the suddenly weakening radar returns might be more due to it getting closer to the radar then actually weakening. Either way, its better then anything I was expecting to see when I woke up this afternoon.

There's a pretty strong large scale rear inflow jet with the complex. Any of that wind mixes down you can get a severe wind gust even without super strong reflectivity returns.

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You guys keep complaining, but I'm pretty happy with what I see right now. The MCS is bowing out right towards Oakland county, so even if they're sub severe the strongest winds should hit here. And the suddenly weakening radar returns might be more due to it getting closer to the radar then actually weakening. Either way, its better then anything I was expecting to see when I woke up this afternoon.

BV suggests 40-45 mph gusts are possible. Also see a nice shelf cloud off in the distance.

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