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July 26 Severe Weather


nwohweather
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For all of the Indiana posters who are watching the severe threat being pushed father north into Michigan with each model run, IND is throwing out a bone by tossing the CAM guidance. It will be interesting to see what SPC says in their Day 1 update.

Potential for severe weather is increasing for Central Indiana for
this evening and into tonight. Aloft, a shortwave trough, already
evident on satellite imagery in Minnesota, dives southeastward into
the lower Great Lakes region by tonight. At the surface, a
quasistationary NW-SE oriented boundary extends from Southern
Minnesota to Southern Indiana. RAP mesoanalysis data shows a sharp
Theta-E and SBCAPE gradient along this boundary as well as a PWAT
and low level moisture max along and southwest of this line. A
southwesterly 20-35 kt low level jet is currently flowing
perpendicular to this boundary, increasing lift right along it, and
also increasing low level shear to values conducive for organized
convective development. The presence of this sharp boundary and a
related instability gradient, along with mean 850-300mb winds out of
the NW, suggests southeastward storm propagation along this boundary
and into the region. Moist air advection into Central Indiana today
will be aided by both the persistent low level jet today and the
rainfall from earlier this morning, likely keeping dew points and
low level moisture values above what CAMs guidance has been showing
for this afternoon and evening. Latest satellite imagery this
morning also shows high clouds associated with thunderstorm blow off
across much of Southern Illinois and Indiana. These clouds may
further enhance the instability boundary during the day by setting
up a differential heating boundary between the clearer skies further
north and cloudier skies further south.

With all this being said, confidence is increasing in deviating from
short term guidance, which shows the current MCV in Minnesota
pushing towards Northern Indiana and Southern Michigan today.
Additional convective development expected along said MCV. Our
current thinking is that this complex will follow the axis of higher
dew points/moisture and ride along the instability/theta-E gradient
with the mean 850-300mb flow southeastward toward Central Indiana.
Potential is there for additional convective development along and
south of the path of the MCV along the aforementioned boundary within
Central Indiana. While this does deviate from what CAMs guidance is
showing, CAMs did not pick up well on the early morning convection
which will influence the evolution of storms later this afternoon.
CAMs are also notorious for over-mixing the PBL and drying out the
lower levels too much within this type of atmospheric set-up. We
will have to keep a close eye on the track of the MCV to the north
through the day, as its track will be pivotal in determining where
the best severe threat is this afternoon through tonight.
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To each their own but I’m not a fan of severe wind, hail and rain. All it means to me is the clean up after. We have a back up natural gas generator thankfully but the power outages are also a pain for many. The power was out for 35 hours here from the last storm a few days ago and still lots of clean up is needed in places. A good buddy of mine has major hail damage to his truck also from the last storm. Hopefully today’s storms fizzle out, we’ve had enough  I feel at least here in the thumb of the MI. It hasn’t been as bad up north but again we don’t need any severe storms up there either.

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3 hours ago, SolidIcewx said:

Latest HRRR model this morning. 

If that verified it would be the most severe storm I'd have in years. I'm watching this setup closely, I'm clear aside from smoke all morning and its sultry unlike any summer day so far. I was laughing when my forecast for later today yesterday showed just "rain at times heavy" instead of chance of storms lmao. That algorithm is so damn bad it hurts, its obvious that was bs! The SPC had me under a Slight when that turd was presented.

  • Haha 1
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