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SEVERE DERECHO, wind gusts 80-120 mph expected - Eastern US Weather Forums

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SEVERE DERECHO, wind gusts 80-120 mph expected


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#1 WXBUFFJIM

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Posted 21 May 2004 - 01:53 PM

Just received a report of 95 mph wind gusts in Ann Arbor, Michigan.  This is an extremely dangerous situation for southeast lower Michigan and into northwest Ohio where derecho wind gusts of 80-120 mph are expected.

Winds were strong enough to flip over cars and toss them around in Indiana.  That maybe 110-120 mph downbursts.  Detroit Intl Airport received 60 mph gusts.

This type of storm is known as a derecho where the wind damage is widespread and very long lasting.  The fast forward eastward motion of these storms makes it even more dangerous.  Wind gusts of 80-120 mph can be expected in the path of this storm from Toledo to Cleveland.  This maybe one of the more widespread outbreaks of the year.

50 fatalities is the average count per year courtesy of derechos.  Do not go outside in this situation.

Jim


#2 Guest_ConnMan_*

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Posted 21 May 2004 - 02:57 PM

Posted Image

Midday shot from MI, looks nasty.

"This squall line roared through the Detroit Metro area. A wind gust of 95 mph was recorded in Ann Arbor, and at Detroit Metro airport the wind officially gusted to 70 mph. In a town near me, hail covered the ground to the depth of 1", looking like a snowfall. Here we had pea/small marble hail and 0.37" of rain in 10 minutes. The sky grew a sick shade of green and unfortunately I was having problems with the camera so pics are blurry."

http://www.wunderground.com/wximage....eanchor


#3 Guest_ConnMan_*

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Posted 21 May 2004 - 03:05 PM

PDS Thunderstorm Watch box about to get pounded

Posted Image

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 235
NWS STORM PREDICTION CENTER NORMAN OK
315 PM EDT FRI MAY 21 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
 
         WESTERN NEW YORK
         NORTHEAST OHIO
         WESTERN AND CENTRAL PENNSYLVANIA
         NORTHERN PANHANDLE OF WEST VIRGINIA
         LAKE ERIE
 
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 315 PM UNTIL 900
PM EDT.
 
  ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
 
EXTREMELY DAMAGING THUNDERSTORM WIND GUSTS TO 80 MPH...LARGE HAIL
TO 2 INCHES IN DIAMETER...AND DANGEROUS LIGHTNING ARE POSSIBLE IN
THESE AREAS.

DISCUSSION...INTENSE BOW ECHO OVER WESTERN LAKE ERIE WILL LIKELY
MAINTAIN INTENSITY AND TRACK ACROSS NORTHEAST OH INTO NORTHWEST PA.
THESE STORMS WILL HAVE THE POTENTIAL FOR SIGNIFICANT WIND
DAMAGE...AS WELL AS LARGE HAIL.  OTHER SCATTERED SEVERE STORMS MAY
DEVELOP SOUTH OF BOW FROM CENTRAL OH INTO SOUTHWEST PA...WITH LARGE
HAIL THE MAIN THREAT.


#4 WXBUFFJIM

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Posted 21 May 2004 - 03:19 PM

A very dangerous situation.  A tornado is near Mansfield, Ohio now.  Tornado warning is up for the Mansfield area until 4:45 PM.  The tornado was spotted near Mansfield at 4:07 PM EDT.

#5 Guest_VortMax_*

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Posted 21 May 2004 - 03:20 PM

:o  WOW!

#6 WXBUFFJIM

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Posted 21 May 2004 - 03:24 PM

Wow is right.  If a bow echo/DERECHO wasn't bad enough, we have to deal with tornadoes too.  

Jim


#7 CalUWxBill

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Posted 21 May 2004 - 03:46 PM

I figured I post this here as well, must be strong outflow boundary associated with this one.

Here is a link to Cod's Satellite animation of this event, notice the faint line in front of the Bow echo,  I highlighted the the current pic below.

http://weather.cod.edu/analysis/loops/satl...pl?Indiana_Ohio

Posted Image


#8 rainstorm

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Posted 21 May 2004 - 06:17 PM

wild weather indeed. intense

#9 SP

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Posted 21 May 2004 - 06:42 PM

Wow....how much for philly? :;):

#10 Guest_VortMax_*

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Posted 21 May 2004 - 11:38 PM

Lots of distant lightning and then it died out before it approached the area.

#11 WXBUFFJIM

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Posted 22 May 2004 - 07:15 AM

We had alot of heat lightning to the west last night.  Then it collapsed.  The only thing left with the outflow with the decaying convective system.  Little rain fell at all in Baltimore last night from this.  Just a 20-25 mph westerly gust in weakening outflow.

Jim






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