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July 11-14 Severe Weather Event


Powerball

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I mentioned the Coal City day earlier, but if you'll recall, there was a zone of festering crapvection well into the afternoon before things took off.  Much quicker clearing today and assuming no early initiation, should theoretically should open the door to areas farther north in IL and maybe WI than what occurred that day.

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Full sun bright blue skies, after clouds most of the morning. Temps dropped when the mcs came thorough, but have rebounded to a 80/72 already. I'm sitting in a hot spot, things are gonna get gnarly. Sad thing is, everyone at work is saying so much for these storms, they all went east.

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Initial MCS now running into some nice instability in southern IN....

 

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
120 PM EDT MON JUL 13 2015

INC079-131745-
/O.CON.KIND.TO.W.0015.000000T0000Z-150713T1745Z/
JENNINGS IN-
120 PM EDT MON JUL 13 2015

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN JENNINGS COUNTY
UNTIL 145 PM EDT...

AT 116 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR NORTH VERNON...AND MOVING SOUTH AT 40 MPH.

HAZARD...TORNADO.

SOURCE...LAW ENFORCEMENT REPORTED A FUNNEL CLOUD NEAR COUNTRY SQUIRE
LAKES.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS
LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...
VERNON AROUND 125 PM EDT.

OTHER LOCATIONS IN THE WARNING INCLUDE PARIS CROSSING.

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Initial MCS now running into some nice instability in southern IN....

SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE INDIANAPOLIS IN

120 PM EDT MON JUL 13 2015

INC079-131745-

/O.CON.KIND.TO.W.0015.000000T0000Z-150713T1745Z/

JENNINGS IN-

120 PM EDT MON JUL 13 2015

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN JENNINGS COUNTY

UNTIL 145 PM EDT...

AT 116 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO

WAS LOCATED NEAR NORTH VERNON...AND MOVING SOUTH AT 40 MPH.

HAZARD...TORNADO.

SOURCE...LAW ENFORCEMENT REPORTED A FUNNEL CLOUD NEAR COUNTRY SQUIRE

LAKES.

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT

SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE

TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR. TREE DAMAGE IS

LIKELY.

THIS DANGEROUS STORM WILL BE NEAR...

VERNON AROUND 125 PM EDT.

OTHER LOCATIONS IN THE WARNING INCLUDE PARIS CROSSING.

Just south of it in East Louisville. Sky just beginning to get dark to the north.

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Some real nice surface/moisture convergence up in northeast IA north of Waterloo.  Dews pooling in the upper 70s just ahead of the convergence area.  Cu starting to pop in the area as well.  I'm guessing we see initiation somewhere over northeast IA in the next few hours.

post-163-0-58720800-1436810334_thumb.png

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IND

 

.AVIATION /DISCUSSION FOR 131800Z TAF ISSUANCE/...
ISSUED AT 120 PM EDT MON JUL 13 2015

CONTINUED IMPACTS FROM CONVECTION THROUGHOUT THE PERIOD...WITH
SUB-IFR RESTRICTIONS IN HEAVIER STORMS.

SEVERE CONVECTIVE LINE CONTINUING ITS MOVEMENT SOUTHEAST ACROSS
SOUTHERN PORTIONS OF INDIANA. KBMG STILL BEING IMPACTED
CURRENTLY...BUT SHOULD SEE STORMS MOVE SOUTH OF THERE BETWEEN
18-19Z. SKIES ARE CLEARING OUT RAPIDLY IN WAKE OF THE STORM
COMPLEX WITH SUNSHINE
AND VFR CONDITIONS EXPECTING TO RETURN TO
ALL TERMINALS THIS AFTERNOON. E/SE WINDS IN WAKE OF THE STORMS
WILL QUICKLY VEER BACK TO SOUTHWEST AND MAY SPORADICALLY GUST LATE
THIS AFTERNOON.


FOCUS THEN SHIFTS TO EXPECTED REDEVELOPMENT OF SEVERE CONVECTION
BY LATE AFTERNOON...MOST LIKELY OVER NORTHERN/CENTRAL ILLINOIS
INTO NORTHWEST INDIANA. HI-RES GUIDANCE CONTINUES TO STRUGGLE WITH
THE DETAILS
...SO HAVE TRIED TO TIME WHEN THINK BIGGEST IMPACTS
FROM NEXT ROUND OF STORMS IMPACTS THE TERMINALS DURING THE
EVENING. WITH THAT BEING SAID...WILL BE CARRYING VCTS FROM 21-22Z
THROUGHOUT THE NIGHT AS THERE ARE HINTS AT EVEN FURTHER CONVECTION
AFTER MIDNIGHT.
 

 

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Some real nice surface/moisture convergence up in northeast IA north of Waterloo.  Dews pooling in the upper 70s just ahead of the convergence area.  Cu starting to pop in the area as well.  I'm guessing we see initiation somewhere over northeast IA in the next few hours.

 

Was just checking that out as well

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Gil over at NIU.  He put this out at noon.

 

FORECAST DISCUSSION: One thing is for sure: I knew going into today that
the forecast was going to be extremely difficult after the initial squall
line of thunderstorms had gone through. And as of 11:15 AM, I can say that
my thinking has met my expectations. Warmer air aloft is streaming into
the area now, putting a "cap" on things. A stationary front now sits
along I-39, and an outflow boundary extends from near Freeport through
central DeKalb county with a rain shower that has formed. Another outflow
boundary was in eastern Iowa through central Illinois. As the temperatures
get up close to 90 degrees, and with a weak upper disturbance moving
through, it may be enough to generate scattered thunderstorms. I do not
think that these will be as organized as what we saw early this morning.
That having been said...that's not good news. Given the southerly winds at
the surface, and northwest winds aloft, the magnitude of the wind shear
for this time of year is disturbing. As you can see, we cleared out by 9
AM, and the temperatures and atmospheric instability is skyrocketing.
After knocking us out of the moderate risk and bumping us to slight, the
Storm Prediction Center has put us back in an enhanced risk and has also
put us in a 10% risk of tornadoes, some possibly strong/violent. I agree
with this assessment, and it appears as though the highest risk will be
along I-39 from Rockford to Ottawa, and eastward to Chicago. Localized
tornado enhancement could occur along the stationary front, and along any
outflow boundaries, as well as the lake breeze. The bottom line is this:
explosive thunderstorm development is likely, once the cap breaks, late
this afternoon and this evening. Individual storms (not a line) is the
likely storm mode, and given the magnitude of the wind shear, they will
likely rotate. Large, and possibly very large hail up to baseball size,
60-100 MPH winds, and a few tornadoes, some possibly intense, may occur
across portions of our forecast area between 3 PM and 10 PM. Given the
amount of moisture in the air, localized 2"+ amounts in 30 minutes time is
a given for the most intense storms, causing flash flooding. MAKE SURE YOU
HAVE MULTIPLE WAYS OF ACCESSING WEATHER WARNINGS THIS AFTERNOON AND THIS
EVENING. Although the severe/tornado threat is conditional, if you get hit
by one of these storms, you are going to know it, and will want to know
about it. Trust me on this. And if you miss everything, which is possible,
that does not mean that there wasn't any danger to you. It means you got
off fortunate. Some people may not by tonight...so stay tuned.

 
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