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2015 Short Term Severe Weather Discussion


Hoosier

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New SPC day 1 outlook out now, they upgraded almost all of Lower Michigan to Enh risk. 30% wind and hail chances here now, I'm kind of excited, but hoping the clouds from the stuff popping in Wisconsin now doesn't ruin my CAPE for tomorrow :D

 

Definitely mixed signals for sure as far as the convection across WI and potential cloud debris issues....

 

20150802_0800_DTW_irbw.jpg

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Sounding good

DAY 4-8 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0355 AM CDT WED AUG 05 2015

VALID 081200Z - 131200Z

...DISCUSSION...

GIVEN FORECAST UNCERTAINTY DESCRIBED IN THE D3 OUTLOOK VALID FOR

FRIDAY...IT SEEMS REASONABLE TO EXPECT CONTINUED UNCERTAINTY INTO

THE EXTENDED RANGE. HOWEVER...LATEST GLOBAL MODELS AND THE GFS

ENSEMBLE DO SEEM TO BE IN GENERALLY GOOD AGREEMENT ABOUT AT LEAST

ONE ASPECT OF THE LARGE SCALE PATTERN ACROSS THE CONUS INTO NEXT

WEEK. THE AMPLITUDE OF THE MIDLEVEL FLOW IS FORECAST TO INCREASE AS

SUBTROPICAL RIDGE STRENGTHENS ACROSS THE MIDDLE OF THE CONUS AND

EXPANDS NWD INTO CENTRAL CANADA. AS THIS PROCESS UNFOLDS /IF IT

UNFOLDS/ UPPER TROUGHS ON BOTH COASTS WILL LIKEWISE AMPLIFY/DEEPEN.

IN ADDITION...THIS PATTERN EVOLUTION...OCCURRING AROUND THIS TIME OF

YEAR...TENDS TO SUPPORT EPISODIC MCS DEVELOPMENT ACROSS THE PLAINS

AND MIDWEST...ON THE NRN/NERN FLANK OF THE RIDGE WHERE SHEAR AND

INSTABILITY TEND TO SUPPORT ORGANIZED STORMS WHEN CAPPING CAN BE

OVERCOME THROUGH DIABATIC AND SYNOPTIC INFLUENCES.

D5/SUN SEEMS TO BE THE FIRST IN A SEQUENCE OF DAYS WHEN CONDITIONS

MAY COME TOGETHER TO SUPPORT ORGANIZED SEVERE STORMS ACROSS THE

MIDWEST/CORN-BELT. HOWEVER...TIMING AND STRENGTH DIFFERENCES IN THE

LOW-AMPLITUDE SHORTWAVE TROUGH THAT WILL AID DEVELOPMENT OVER THE

REGION ARE SUCH THAT CONFIDENCE IN DELINEATING A RISK AREA IS LOW.

DISCREPANCIES IN THE MINOR DETAILS THAT MATTER FOR SEVERE WEATHER

FORECASTING ONLY INCREASE IN THE EXTENDED PERIOD AND PREDICTABILITY

REMAINS TOO LOW FOR ANY OTHER DAILY OUTLOOK AREAS AT THIS TIME.

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DAY 4-8 CONVECTIVE OUTLOOK

NWS STORM PREDICTION CENTER NORMAN OK

0344 AM CDT THU AUG 06 2015

VALID 091200Z - 141200Z

...DISCUSSION...

UPPER AIR PATTERN OVER NOAM IS FORECAST TO UNDERGO SIGNIFICANT

AMPLIFICATION THROUGH THE MIDDLE OF NEXT WEEK AS A STRONG

ANTICYCLONE CENTERED OVER THE S-CNTRL U.S. EXPANDS NORTH INTO CNTRL

CANADA. AS THIS OCCURS...ANOMALOUSLY DEEP UPPER TROUGHS ARE FORECAST

TO DEVELOP OVER THE WEST AND EAST COASTS. IT IS POSSIBLE IN SUCH A

PATTERN TO EXPERIENCE EPISODES OF SEVERE WEATHER...ESPECIALLY FROM

THE GREAT LAKES/MIDWEST TO EAST COAST...ON THE EDGE OF THE PLAINS

ANTICYCLONE...AS DISTURBANCES TRACK SEWD IN THE FASTER FLOW ON ITS

PERIPHERY. HOWEVER...A COMPARISON OF LATEST GFS AND EURO SUGGEST

SUBSTANTIAL DIFFERENCES IN HOW THE COMPLEX ERN U.S. TROUGH WILL

EVOLVE DURING THE PERIOD. THESE DIFFERENCES RESULT IN PART FROM WHAT

IS LIKELY TO BE A CONVECTIVELY INDUCED OR ENHANCED SHORTWAVE TROUGH

CROSSING THE UPPER MS VALLEY FROM D4/SUN INTO D5/MON. AS THIS

POSSIBLE MCS AND ASSOCIATED MCV/SHORTWAVE TRACK E-SEWD FROM THE

MIDWEST TO THE APPALACHIANS...LATEST EURO DEVELOPS A MUCH MORE

VIGOROUS IMPULSE WHEN COMPARED TO GFS. THE EURO FORECASTS A STRONG

NEGATIVE-TILT SHORTWAVE TROUGH TO EVOLVE OVER DELMARVA BY EARLY

D7/WED...ACCOMPANIED BY AN UNUSUALLY DEEP SURFACE LOW NEAR NYC.

MEANWHILE...LATEST GFS IS MUCH LESS AMPLIFIED WITH THIS MCV/TROUGH

AND ONLY MANAGES A WEAK 1010MB SURFACE LOW NEAR LONG ISLAND BY WED.

GFS ENSEMBLE MEAN QPF DOES HOWEVER SUPPORT HIGHER POTENTIAL FOR

LOCALLY HEAVY PRECIPITATION ALONG THE ERN SEABOARD BY MIDWEEK BUT

THIS COULD JUST AS EASILY LIMIT POTENTIAL DESTABILIZATION AND SEVERE

WEATHER RISK. THESE COMPLEXITIES...AS WELL AS OTHER YET-TO-FORM

CONVECTIVE PERTURBATIONS LIKELY TO ORBIT THE AMPLIFYING UPPER

RIDGE...SUPPORT LOW SEVERE WEATHER PREDICTABILITY FOR THE WEEK

AHEAD.

..CARBIN.. 08/06/2015

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Today is a little more interesting. Have had some heavy downpours, thunder and really small hail in Racine the last hour.

 

Looks like Chicagoland will not be spared the rain. Plenty of cells heading in from the northwest.

 

Severe T-storm warning for Milwaukee County.

 

 

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1155 AM CDT MON AUG 10 2015

WIC079-089-133-101700-
/O.CON.KMKX.SV.W.0055.000000T0000Z-150810T1700Z/
OZAUKEE WI-MILWAUKEE WI-WAUKESHA WI-
1155 AM CDT MON AUG 10 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
SOUTH CENTRAL OZAUKEE...MILWAUKEE AND EASTERN WAUKESHA COUNTIES...

AT 1154 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER WHITEFISH
BAY...MOVING SOUTHEAST AT 25 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...DAMAGE TO VEHICLES IS EXPECTED.

LOCATIONS IMPACTED INCLUDE...
MILWAUKEE...WEST ALLIS...WAUWATOSA...BROOKFIELD...GREENFIELD...
MENOMONEE FALLS...MEQUON...WHITEFISH BAY...GREENDALE...BROWN DEER...
ST. FRANCIS...FOX POINT...BAYSIDE...WEST MILWAUKEE...THIENSVILLE...
BUTLER...RIVER HILLS...MILWAUKEE HOAN BRIDGE...SHOREWOOD AND
GLENDALE.

PEOPLE ATTENDING THE WISCONSIN STATE FAIR SHOULD SEEK SAFE SHELTER
IMMEDIATELY!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

 

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Today is a little more interesting. Have had some heavy downpours, thunder and really small hail in Racine the last hour.

 

Looks like Chicagoland will not be spared the rain. Plenty of cells heading in from the northwest.

 

Severe T-storm warning for Milwaukee County.

 

Yeah, that was a very solid storm, garden variety imby (though the best drink from mother nature we've had in a month or two) but some quarter to even a rogue report of golf ball sized hail just NW of here in Washington County.

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Does it trouble anyone like it does me when you encounter a svr warning that says a cell is moving east?  And then you look at the radar and it is clearly moving se or ne.  I've seen this with warnings from multiple offices.  Consider the svr warned cell affecting southern Montgomery and western Hendricks counties west of Indpls at present.

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Mini line that just rolled through here packed a bunch. Some of the heaviest rain I've seen in a while, streets flooded up real quick.

 

Was storm watching on the porch and saw some dude caught in the storm holding a box of pizza. Invited him to take shelter on my porch, got a free slice of pizza out of it. Win win.

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