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#flashflood

2 posts1 participant0 posts today
Continued thread
Public
AI6YR Ben

308
WGUS56 KLOX 032300
FFWLOX
CAC037-040100-
/O.NEW.KLOX.FF.W.0012.250403T2300Z-250404T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Los Angeles/Oxnard CA
400 PM PDT Thu Apr 3 2025

The National Weather Service in Los Angeles/Oxnard has issued a

* Flash Flood Warning for...
A Small Portion of West Central Los Angeles County in southwestern
California...

* Until 600 PM PDT.

* At 400 PM PDT, the public reported flooding from thunderstorms
with heavy rain across the warned area. Flash flooding is ongoing
or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public reported flooding beginning.

IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas. Rock slides
and mud slides will be possible.

* Some locations that will experience flash flooding include...
Northridge, Van Nuys, Granada Hills, Sylmar, Pacoima, Porter
Ranch, Panorama City, Arleta, San Fernando and North Hills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

#CAwx#flashflood#Northridge
Public
DoomsdaysCW

How wildfires leave communities vulnerable to flooding, mudslides for years

#Wildfires of every size leave behind something known as a #BurnScar, or the area of land charred by flames and left devoid of vegetation.

By Brian Lada

"#Flooding and #DebrisFlows can happen with little warning in burn scars and most commonly occur during a heavy thunderstorm or major #rainstorm.

"'Rainfall that would normally be absorbed will run off extremely quickly after a #wildfire, as burned soil can be as water repellent as pavement. As a result, much less rainfall [than normal] is required to produce a #FlashFlood,' The National Weather Service (#NWS) said."

Read more:
accuweather.com/en/weather-new
#CaliforniaFires #BurnScars #FloodDanger

Public *
anlomedad

Friederike Otto who founded the World Weather Attribution Centre in 2014 weighs in on #Spain #Valencia #heavyrain #flashflood .
Good piece, good advice and criticism. theguardian.com/commentisfree/

I'm virgin in statistics and can't really grasp the sense of "twice as likely". Surely I'm not the only one. Cd be useful to translate this expression for simple minds like mine. As form of adaptation in clicom / scicom lingo.

What does this expression translate to in my life experience? It leaves a blank in my brain.
Also relates to what "protection yard stick" I would demand from my city council eg. in Chiva, and to how I could judge the sufficiency of their proposals.

The rainfall during #Helene was attributed as "70% more likely by #ClimateChange " worldweatherattribution.org/cl
Is 70% less or more than Valencia's "twice as likely" ?

I can't explain why I can't make sense of it. It just leaves a blank space in my head. Before I fathom its meaning, I also can't suggest different wordings.

If you're a German speaker, I'd appreciate an answer in German very much. But English would be very helpful, too.

The Guardian · Why did so many die in Spain? Because Europe still hasn’t accepted the realities of extreme weatherBy Friederike Otto
Public
Mix Mistress Alice💄

Elected politician in these regions failed to warn the population on time.
The AEMET already warned authorities since Tuesday 28 of October but Valencia right-wing (PP) "climate skeptics" governor, Carlos Mazón, didn't trigger the warnings until 8:30 PM.
The population was already trapped by that time.
Many business still demanded employees to keep doing their job!

"As Spain’s flood death toll rises, authorities under fire for Warning System failure"—DW News >

youtu.be/K3owGyK-Hzg?si=5ZKRVE

YouTubeAs Spain’s flood death toll rises, authorities under fire for warning system failure | DW NewsBy DW News
#DANA#Valencia#Murcia
Continued thread
Public
anlomedad

The Guardian also has an article on #Valencia #Andalusia #FlashFlood
that brought 355mm of rain in 4 hours...

It has a bit more explanation on how it happened:
"The intense rain has been attributed to a phenomenon known as the gota fría, or “cold drop”, which occurs when cold air moves over the warm waters of the Mediterranean Sea. This creates atmospheric instability, causing warm, saturated air to rise rapidly, leading to the formation of towering cumulonimbus clouds in a matter of hours and dumping heavy rain across eastern parts of Spain.

Scientists warn that extreme weather such as heatwaves and storms is becoming more intense as a result of the #ClimateCrisis "

theguardian.com/world/2024/oct

Should have added that the Climate Crisis is fuelled by burning fossil fuels and also by the emissions from land use.
And that losing the natural carbon sinks as feedback to the climate stress makes emission cuts to zero all the more urgent. Lest even more of our emissions end up in the atmosphere when sinks no longer help us as they used to.
Like last year, when sinks only took up 23% of our annual emissions instead of the previous 50%.

The Guardian · Dead bodies found after torrential rain brings flash flooding to SpainBy Guardian staff reporter
Public
anlomedad

#Spain #Valencia #Floods #Flashflood
#HeatDome #Africa

Jeff Berardelli posted an explanation for Tuesday's torrential rain in Spain. A blocking kept the low in place and dump all the water in one place.
nitter.poast.org/WeatherProf/s

"Once again Europe has found itself a victim of severe blocking, resulting in 13” of rain in just 4 hours with devastating flooding!
Below you can see the storm cut off from steering stuck in between blocking in all directions."

13 inches in 4 hours = 355mm of rain...

Screenshot of Jeff's video showing the globe, zoomed in on Spain where a Low hovers over the whole peninsula, flanked by two Highs placed there by the jetstream. Also, Northern Africa shows to be under a heat dome...
Public
AI6YR Ben

NWS:

FWABQ The National Weather Service in Albuquerque has issued a * Flash Flood Warning for... North Central Chaves County in southeastern New Mexico... * Until 1015 PM MDT. * At 722 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 2.25 and 3 inches of rain have fallen. Additional rainfall amounts of 0.25 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. ... Some locations that will experience flash flooding include... Mainly rural areas of North Central Chaves County. This includes Highway 285 between Mile Markers 123 and 145.

FWABQ The National Weather Service in Albuquerque has issued a * Flash Flood Warning for... North Central Chaves County in southeastern New Mexico... * Until 1015 PM MDT. * At 722 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 2.25 and 3 inches of rain have fallen. Additional rainfall amounts of 0.25 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Mainly rural areas of North Central Chaves County. This includes Highway 285 between Mile Markers 123 and 145.
#NMwx#flashflood#ChavesCounty
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