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August 10 Severe Weather


Chicago Storm
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Um Wow! Indy under a warning for a storm moving 90mph!

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BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Indianapolis IN
736 PM EDT Mon Aug 10 2020

The National Weather Service in Indianapolis has issued a

* Severe Thunderstorm Warning for...
  Southern Madison County in central Indiana...
  Hancock County in central Indiana...
  Marion County in central Indiana...
  Southeastern Hamilton County in central Indiana...

* Until 800 PM EDT.

* At 735 PM EDT, a severe thunderstorm was located near Lawrence, or
  10 miles east of Indianapolis, moving east at 90 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Indianapolis, Carmel, Fishers, Lawrence, Greenfield, Beech Grove,
  Speedway, Cumberland, McCordsville, Pendleton, Fortville, Ingalls,
  New Palestine, Meridian Hills, Warren Park, Rocky Ripple,
  Markleville, Wilkinson, Williams Creek and Wynnedale.

This includes the following highways...
 Interstate 65 between mile markers 107 and 120.
 Interstate 69 between mile markers 200 and 210.
 Interstate 70 between mile markers 74 and 112.
 Interstate 74 between mile markers 73 and 96.

 

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4 minutes ago, Calderon said:

Oh, I've seen the video posted on Twitter. Definitely a confirmed today given the very obvious rotating and upward motion of the debris cloud. 

Yeah I saw a couple vids.  One from closer up as it moves out into Lake Michigan and the other from a bit farther away in which you clearly see debris being lofted.

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URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 431
   NWS Storm Prediction Center Norman OK
   805 PM EDT Mon Aug 10 2020

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Extreme southeastern Indiana
     Extreme north central Kentucky
     Western Ohio
     Lake Erie

   * Effective this Monday night and Tuesday morning from 805 PM
     until 100 AM EDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph possible
     Isolated large hail events to 1 inch in diameter possible

   SUMMARY...A well-developed squall line will likely persist for a few
   more hours while moving from Indiana into western Ohio and northern
   Kentucky.  The threat for occasional damaging gusts will likewise
   continue, until the storms weaken later tonight.

   The severe thunderstorm watch area is approximately along and 40
   statute miles east and west of a line from 15 miles north northwest
   of Toledo OH to 50 miles south southwest of Cincinnati OH. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU1).

 

ww0431_radar.gif

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Power out here, going on 9hrs.  Was in the QC all evening.  Pitch black everywhere there too with pretty much the entire area still without power.

Can't ever remember seeing such a wide expanse of damage.  Usually after you have a severe storm when you drive around afterwards you come across areas hit hard, then go through areas where there's nothing.  In this case everywhere you go there's significant tree damage and in some cases roads blocked off from trees and or power lines. This event will be hard to top.

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1 hour ago, cyclone77 said:

Power out here, going on 9hrs.  Was in the QC all evening.  Pitch black everywhere there too with pretty much the entire area still without power.

Can't ever remember seeing such a wide expanse of damage.  Usually after you have a severe storm when you drive around afterwards you come across areas hit hard, then go through areas where there's nothing.  In this case everywhere you go there's significant tree damage and in some cases roads blocked off from trees and or power lines. This event will be hard to top.

So true.  The wind footprint from some of these derechos is sort of like a tropical system over land.  

Even though you generally don't get house flattening damage, the widespread area of substantial tree damage and low-moderate end structural damage is going to make this one fairly costly.  

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21 minutes ago, A-L-E-K said:

Easily a top severe wind event for me, it went from relative calm to absolute peak so damn fast, every one of the large trees outside my office building came down at the same time as a wall of gray hit.

Did the wind start before, at the onset or after the rain started?  For us it was probably five to ten minutes after the heavy rain that the wind really kicked in.

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So true.  The wind footprint from some of these derechos is sort of like a tropical system over land.  
Even though you generally don't get house flattening damage, the widespread area of substantial tree damage and low-moderate end structural damage is going to make this one fairly costly.  

That’s why I kept calling it a landi-cane
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50 minutes ago, wisconsinwx said:

Raymond, maybe a few miles west of where UMB Wx and I were stationed, reported 5.8” of rain.  It’s crazy but I’m not even that surprised with the way it came down (most of that would’ve fallen in an hour’s time).

Our place is 1.8 miles from where we were and on my way home the ditches were pretty full and flowing good.. water flowing over the roads in a few places.. Yards with new ponds.  Ponds in yards that were totally taken over and over its banks.  Pretty bad. Our basement took on water but not terribly considering the conditions. 

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This was a memorable storm for me for sure! When that PDS severe watch got issued, I threw all my gear in my car and headed up to the Oglesby, IL area. I pointed my car into the wind as it approached and enjoyed the show. The area took some serious damage and I encountered several roads blocked by downed trees and flipped semis on my way out. Unfortunately I bumped my dash cam into autofocus at some point so I ended up getting 50GB of macro footage of raindrops on my windshield. :axe:

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Public Information Statement
National Weather Service Northern Indiana
246 PM EDT Tue Aug 11 2020 /146 PM CDT Tue Aug 11 2020/


...NWS DAMAGE SURVEY FOR AUGUST 10, 2020 TORNADOES...

Two tornado tracks were identified through storm surveys
conducted on August 11.

.TORNADO 1...

Rating:                 EF-1
Estimated peak wind:    110 mph
Path length /Statute/:  2.5 miles
Path width /Maximum/:   100 yards
Fatalities:             0
Injuries:               0

Start date:             August 10, 2020
Start time:             6:32 PM EDT
Start location:         6 miles SW Wakarusa
Start Lat/Lon:          41.5079 / -86.1238

End date:               August 10, 2020
End time:               6:37 PM EDT
End location:           3.5 miles SW Wakarusa
End_lat/lon:            41.5076 / -86.0755

SURVEY SUMMARY:
The tornado began west of the intersection of Riley Rd and Dogwood Rd
in southeast St. Joseph County. It then tracked along and south of
Riley Rd. Widespread tree and structural damage occurred through this path. Grain bins were
toppled and farm outbuildings sustained significant damage.
The tornado tracked through several cornfields that resulted
in significant crop damage. The tornado lifted just east of Beech Rd.


.Tornado 2...

Rating:                 EF-1
Estimated peak wind:    90 mph
Path length /Statute/:  1.5 miles
Path width /Maximum/:   100 yards
Fatalities:             0
Injuries:               0

Start date:             August 10, 2020
Start time:             6:56 PM EDT
Start location:         0.75 miles N North Webster
Start Lat/Lon:          41.3360 / -86.7020

End date:               August 10, 2020
End time:               6:59 PM EDT
End location:           1.2 miles E North Webster
End_lat/lon:            41.3271 / -85.6752

Trees were snapped west of State Route 13. The tornado then
crossed SR 13, resulting in a notable path of trees snapped
and broken limbs. These debris were scattered throughout a nearby
church parking lot. The church sustained a loss of roof covering.
Additional areas of tree damage were noted farther to the east-
southeast. Some homes sustained damage as a result of falling
trees and branches. The tornado then crossed out over Lake Webster
and dissipated.


EF Scale: The Enhanced Fujita Scale Classifies
Tornadoes into the following categories.

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 To 200 mph
EF5...Violent...>200 mph

NOTE:
The information in this statement is PRELIMINARY and subject to
change pending final review of the event and publication in
NWS Storm Data.

$$

Brown/T
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Satellite image of the extensive blowdown in Iowa from yesterday’s derecho. You can see the tracks of the individual MCVs and bowing segments that enhanced the winds near/north of Des Moines, and then the US 30/I-80 corridors through Marshalltown towards Cedar Rapids and the Quad Cities.

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Guys,

The pics and videos really capture the intensity of that derecho.  Fortunately, by the time the storms reached us here just south of Dayton OH, top winds speeds in my backyard were 47mph.  Hope you guys stayed safe and didn't suffer too much damage.

 

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