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2018 Mid-Atlantic General Severe Discussion


Kmlwx
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Rain totals are bad, but downtown Ellicott city is in a bad geographic spot. 144/Frederick Rd was built parallel to a Patapasco tributary that has a funnel point right where it enters the a Patapasco, which is right where downtown is.  Water has nowhere to go but up and faster during a big rain, hence the class death rapids that destroys anyone and anything unlucky enough to be on that part of 144 when a flash flood happens.

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3 minutes ago, Amped said:

Rain totals are bad, but downtown Ellicott city is in a bad geographic spot. 144/Frederick Rd was built parallel to a Patapasco tributary that has a funnel point right where it enters the a Patapasco, which is right where downtown is.  Water has nowhere to go but up and faster during a big rain, hence the class death rapids that destroys anyone and anything unlucky enough to be on that part of 144 when a flash flood happens.

Yeah the amount of people on social media saying "ENOUGH IS ENOUGH SOMETHING NEEDS TO BE DONE TO PREVENT THIS" is kind of surprising to me. Do people not know how powerful water is? The topography and layout of Ellicott City is conducive to tragic flooding like this. 

If you for example create barriers somewhere (assuming they hold and are effective) - you probably cause a flood someplace else next time. 

Was just in a tweet thread with a person who keeps insisting that "we shouldn't have to just accept it and deal with it - something needs to be done this time" - The user kept talking about "better drainage" - yeah...not going to work with topography like that and 10 inches of rain. 

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1 minute ago, Kmlwx said:

Yeah the amount of people on social media saying "ENOUGH IS ENOUGH SOMETHING NEEDS TO BE DONE TO PREVENT THIS" is kind of surprising to me. Do people not know how powerful water is? The topography and layout of Ellicott City is conducive to tragic flooding like this. 

If you for example create barriers somewhere (assuming they hold and are effective) - you probably cause a flood someplace else next time. 

Was just in a tweet thread with a person who keeps insisting that "we shouldn't have to just accept it and deal with it - something needs to be done this time" - The user kept talking about "better drainage" - yeah...not going to work with topography like that and 10 inches of rain. 

The CE talked up their improvements and left many with the impression that it would never happen again.  

https://twitter.com/GeorgeSolisWJZ/status/1000874145960398848

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3 minutes ago, Eskimo Joe said:

The CE talked up their improvements and left many with the impression that it would never happen again.  

https://twitter.com/GeorgeSolisWJZ/status/1000874145960398848

Well there's your problem then...

I'm not familiar with the CE up there but I cannot believe he would say something like that. When you're at a funnel point like that it's going to flood catastrophically when you get that much rain in a short amount of time. 

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Jesus... 6 to 12 inches in probably what, 3 hours or so?

 

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
723 PM EDT SUN MAY 27 2018

MDC005-027-280230-
/O.CON.KLWX.FF.W.0017.000000T0000Z-180528T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard MD-Baltimore MD-
723 PM EDT SUN MAY 27 2018

...THIS IS A FLASH FLOOD EMERGENCY FOR ELLICOTT CITY AND
CATONSVILLE...

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT FOR
EAST CENTRAL HOWARD AND SOUTHWESTERN BALTIMORE COUNTIES...

At 719 PM EDT, significant flash flooding is ongoing in the area as
a result of fairly widespread 6 to 12 inches of rain that have
fallen this afternoon and evening. Additional rain is falling but
has significantly decreased in intensity. But floodwaters continue
to move through the warning areas, and runoff will continue for at
least a couple more hours, with potential for renewed flooding.
REMAIN AT HIGHER GROUND UNTIL THE RAIN HAS ENDED!

This is a FLASH FLOOD EMERGENCY for Ellicott City and Catonsville.
This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!

Some locations that will experience flooding include...
Ellicott City, Catonsville, Woodlawn, Arbutus, Ilchester and Oella.

This includes the following streams and drainages...Dead Run...Red
Hill Branch...Patapsco River...Sucker Branch...Maidens Choice Run...
East Branch...Little Patuxent River and Herbert Run.
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I am guessing this portion of the warning is away from EC

 

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
759 PM EDT SUN MAY 27 2018

MDC005-027-280230-
/O.CON.KLWX.FF.W.0017.000000T0000Z-180528T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard MD-Baltimore MD-
759 PM EDT SUN MAY 27 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT FOR
EAST CENTRAL HOWARD AND SOUTHWESTERN BALTIMORE COUNTIES...

At 756 PM EDT, emergency management reported widespread damage from
flash flooding. Rain is ending but ongoing flooding will persist
for a couple more hours at least.

Some locations that will experience flooding include...
Ellicott City, Catonsville, Woodlawn, Arbutus, Ilchester and Oella.

This includes the following streams and drainages...Dead Run...Red
Hill Branch...Patapsco River...Sucker Branch...Maidens Choice Run...
East Branch...Little Patuxent River and Herbert Run.
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6 minutes ago, Maestrobjwa said:

Is there something about the region in particular that they can get 10-inch rainfall like this? (Wonder why it targets that area specifically like that). Or is this just a freak thing?

I've read that downwind towns from uhi's can increase precipitable water.  There has to be a lot more to it.

eta: I see Ellicott City is upwind

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