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May 15-20th Severe Weather Event


Chicago Storm

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BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville Il
1004 PM CDT WED MAY 17 2017

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Southeastern Winnebago County in north central Illinois...
  Southern Boone County in north central Illinois...

* Until 1030 PM CDT
    
* At 1004 PM CDT, a severe thunderstorm capable of producing a
  tornado was located near Cherry Valley, or near Rockford Airport,
  moving northeast at 55 mph.

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4 minutes ago, SchaumburgStormer said:

Storm ahead of it in New Milford is rotating as well

 

3 minutes ago, Jim Martin said:

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Chicago/Romeoville Il
1004 PM CDT WED MAY 17 2017

The National Weather Service in Chicago has issued a

* Tornado Warning for...
  Southeastern Winnebago County in north central Illinois...
  Southern Boone County in north central Illinois...

* Until 1030 PM CDT
    
* At 1004 PM CDT, a severe thunderstorm capable of producing a
  tornado was located near Cherry Valley, or near Rockford Airport,
  moving northeast at 55 mph.

And it's warned 

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9 minutes ago, HillsdaleMIWeather said:

Line headed toward Chicago could cause some damage, somewhat surprised the Tornado Watch didn't get a areal expansion into Chi

Given the veered surface flow and current storm mode, there's no real reason for a tornado watch that far east. Blue box would be much more appropriate.

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Gonna be real interesting to see these storms rapidly weaken after hitting Lake Michigan

MARINE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1204 AM EDT THU MAY 18 2017

LMZ844>849-868-870-872-874-876-878-180600-
1204 AM EDT THU MAY 18 2017

...STRONG THUNDERSTORMS APPROACHING THE WATERS...

THE AREAS AFFECTED INCLUDE...
  NEARSHORE AND OPEN WATERS FROM ST JOSEPH TO MANISTEE MI...

AT 1159 PM EDT...DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS...CAPABLE OF PRODUCING WINDS TO AROUND 50 KNOTS. THESE
THUNDERSTORMS WERE LOCATED FROM NEAR SHEBOYGAN WISCONSIN TO WEST OF
CHICAGO ILLINOIS...MOVING NORTHEAST AT 65 KNOTS.

THESE STORMS AND THE WIND ASSOCIATED WITH THEM ARE EXPECTED TO
GRADUALLY DIMINISH AS THEY APPROACH THE MICHIGAN WATERS OF LAKE
MICHIGAN. THEY COULD STILL HAVE WINDS OF 30-40 KNOTS AS THEY MOVE
OVER THE WATERS, AND MAY REQUIRE A SPECIAL MARINE WARNING.

STRONG THUNDERSTORMS WILL BE NEAR...MANISTEE LIGHTHOUSE AROUND 1245
AM EDT. THE LITTLE SABLE POINT LIGHTHOUSE AROUND 100 AM EDT. THE
GRAND HAVEN PIERHEADS AND THE MONA LAKE CHANNEL AROUND 135 AM EDT.
THE MUSKEGON PIERHEADS AROUND 140 AM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MARINERS CAN EXPECT GUSTY WINDS TO AROUND 30 KNOTS...LOCALLY HIGHER
WAVES...AND LIGHTNING STRIKES. BOATERS SHOULD SEEK SAFE HARBOR
IMMEDIATELY UNTIL THESE STORMS PASS.

THESE STRONG THUNDERSTORMS WILL LIKELY PRODUCE WINDS TO AROUND 30
KNOTS...AND COULD POSE A SERIOUS HAZARD FOR BOATERS. A SPECIAL MARINE
WARNING MAY EVENTUALLY BE REQUIRED WHEN THESE STORMS REACH THE
NEARSHORE WATERS. BOATERS SHOULD CONSIDER HEADING FOR SHORE BEFORE
THESE STORMS ARRIVE.
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Intercepted a tornado warned supercell north of Muscatine around 5pm.  It looked like a classic supercell when we first met up with it, but ended up morphing into a low precipitation supercell.  Dropped golf balls on Durant just to our west.  Storm had decent rotation, but had a fairly high base with the high temp/dew spreads at the time.  Winds were absolutely ripping out ahead of it.  Southerly winds were gusting well over 40mph kicking up a ton of dust.  Haven't seen that much blowing dust around here in a long time.  Felt like we were chasing out in western Kansas lol.

Here's a few pics.

4k8pid.jpg

2wgf59c.jpg

33etzkw.jpg

 

Time lapse of the approaching sup.

 

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8 hours ago, cyclone77 said:

Intercepted a tornado warned supercell north of Muscatine around 5pm.  It looked like a classic supercell when we first met up with it, but ended up morphing into a low precipitation supercell.  Dropped golf balls on Durant just to our west.  Storm had decent rotation, but had a fairly high base with the high temp/dew spreads at the time.  Winds were absolutely ripping out ahead of it.  Southerly winds were gusting well over 40mph kicking up a ton of dust.  Haven't seen that much blowing dust around here in a long time.  Felt like we were chasing out in western Kansas lol.

You can see in your time lapse, things were rotating just fine, just missing a little something to dig into the boundary layer and spin up low level mesos.

The SPC storm reports page shows the story, cold pools dominated. We just needed a little more or deeper moisture.

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3 hours ago, OceanStWx said:

You can see in your time lapse, things were rotating just fine, just missing a little something to dig into the boundary layer and spin up low level mesos.

The SPC storm reports page shows the story, cold pools dominated. We just needed a little more or deeper moisture.

Probably will see some red fill in, but there were a lot of wind reports.  We had a decent amount of discrete/semi discrete cells, but being just a bit off on moisture seems like it precluded a bigger tornado event.

170517_rpts_filtered.gif

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4 minutes ago, Hoosier said:

Probably will see some red fill in, but there were a lot of wind reports.  We had a decent amount of discrete/semi discrete cells, but being just a bit off on moisture seems like it precluded a bigger tornado event.

I know DVN confirmed a tornado in a TOR, but hasn't issued the LSR yet (probably awaiting the survey).

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
323 PM CDT THU MAY 18 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1021 PM     TORNADO          2 S POPLAR GROVE        42.33N 88.82W
05/17/2017  F1               BOONE              IL   NWS STORM SURVEY

            AN NWS SURVEY TEAM CONFIRMED THAT AN EF-1 TORNADO TOUCHED
            DOWN APPROXIMATELY TWO MILES SOUTH OF POPLAR GROVE. THE
            TORNADO TRAVELED APPROXIMATELY 10.3 MILES AND LIFTED
            THREE MILES NORTHWEST OF HARVARD. THE TORNADO WAS ON THE
            GROUND FOR AROUND 13 MINUTES.


&&

$$

BMD

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9 hours ago, OceanStWx said:

You can see in your time lapse, things were rotating just fine, just missing a little something to dig into the boundary layer and spin up low level mesos.

The SPC storm reports page shows the story, cold pools dominated. We just needed a little more or deeper moisture.

Yep, a little more moisture would have gone a long way to improving things.  

With the two new tornadoes confirmed by DVN that brings them up to 16 tornadoes for 2017 so far.  

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12 minutes ago, cyclone77 said:

Yep, a little more moisture would have gone a long way to improving things.  

With the two new tornadoes confirmed by DVN that brings them up to 16 tornadoes for 2017 so far.  

Sounds like they had 5 total yesterday.

16 tornadoes might be more than they had in my 2.5 years there. :(

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