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Feb 28th - March 1st Severe Weather Outbreak


andyhb

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Severe Thunderstorm Warning
ILC099-010430-
/O.NEW.KLOT.SV.W.0020.170301T0334Z-170301T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Chicago/Romeoville Il
934 PM CST TUE FEB 28 2017

The National Weather Service in Chicago has issued a

* Severe Thunderstorm Warning for...
  La Salle County in north central Illinois...

* Until 1030 PM CST

* At 934 PM CST, severe thunderstorms were located along a line
  extending from 6 miles east of Walnut to near Princeton to near
  Bradford, moving east at 55 mph.

  These are very dangerous storms.

  HAZARD...80 mph wind gusts and ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without
           shelter. Mobile homes will be heavily damaged. Expect
           considerable damage to roofs, windows, and vehicles.
           Extensive tree damage and power outages are likely.

* Severe thunderstorms will be near,
  Peru, Oglesby and La Salle around 950 PM CST.
  Mendota, Utica and North Utica around 955 PM CST.
  Tonica around 1000 PM CST.
  Ottawa, Earlville and Naplate around 1005 PM CST.
  Marseilles, Serena and Leland around 1010 PM CST.
  Sheridan and Grand Ridge around 1015 PM CST.
  Seneca around 1025 PM CST.

Other locations impacted by these severe thunderstorms include
Naplate, Troy Grove, Cedar Point, Leonore and Millington.

Including the following interstates...
 I-39 between mile markers 47 and 74.
 I-80 between mile markers 74 and 103.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. These storms have the potential to cause
serious injury and significant property damage.
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2 minutes ago, MattPetrulli said:

MO cell is starting to look nasty heading towards some more populated areas.

Definitely has that 'look' to it... Nothing to its south right now to interfere with it too.

Main storm near Enfield, IL is starting to reorganize too.

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5 minutes ago, jojo762 said:

Definitely has that 'look' to it... Nothing to its south right now to interfere with it too.

Main storm near Enfield, IL is starting to reorganize too.

500 to 550 0-1km helicity in the area of that MO cell about to cross the river for possibly the Carbondale region.  Incredible.

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The gradual intensification of the upper level gradients now to 18z will probably justify a MDT or even HIGH risk warning for day 2 and the continuation of either ENH or HIGH overnight. This won't settle down at all, the complex in IN will move steadily through OH overnight with continued tornadoes of F-2 or even F-3, the frontal wave west of Chicago will ripple through s MI into sw ON with very strong storms (large hail and frequent lightning) and the squall line feature is now taking shape in western IL to se MO. That will intensify later tonight and become a high impact event for most of IN and OH towards morning in IN and morning to mid-day in OH. I also expect that the squall line will accelerate into the northeast and Mid-Atlantic states later Wednesday with widespread damaging wind gusts and local F-2 tornadic damage. 

Given the current intensity under 70-90 knot 500-mb winds, we can only imagine how this will respond to an increase overnight to 110-120 knots. 

At this point I think something like a major PDS statement for the entire region might be called for, as many (general public not present company) with some experience with tornado outbreaks might be thinking the peak has passed and in fact this could get worse overnight and peak tomorrow (again it could be argued) around OH-KY-TN. 

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13 minutes ago, Hoosier said:

Yeah really.  Seeing that corridor get hit this many times is memorable.  Still hard to believe we are just about to turn the calendar to March.

Did you end up chasing?

I did, not the best chase in the world though.

 

Left a bit late and had to play catch-up to the original tornadic supercell. Went through the core on I-39 near Troy Grove headed south. I planned on racing to get ahead of it on I-80, but ended up stuck in traffic between exits as it hit Ottawa. Finally got on Rte 6 in Ottawa and continued east trying to catch it. Did end up reaching it Morris, where I had a brief/rainy view of the bowl shaped funnel before it weakened and pushed ENE. Decided to drop southwest to make a play on the southern most tornadic storm near Washburn at the time. Finally met it near Ransom, but by that time rotation had weakened. Called it a night after...

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5 minutes ago, NWLinnCountyIA said:

Speaking of chasing, did Cyclone go out?

I was afraid you'd ask that lol.  BUSSSST!  Had to work till 4, and ran up after that tor warned cell coming out of Iowa near Clinton/Camanche.  Was fairly disorganized when I got to it, although it actually had some decent inflow into it.  Winds had backed quite nicely out ahead of it, and were actually southeasterly.  After staying with it for a bit I could tell it was cooked.  Was too far to get down to the good stuff in north-central IL.  Was sure nice to get out though after a looooong (oh wait) winter.

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