Sandy moving ashore, bringing record storm surge flooding
Hurricane Sandy is making its final approach, and will be ashore near the Delaware/new Jersey border early this evening. The scale of this massive storm truly earns Sandy the title of "superstorm", and no storm since at least 1988 has struck the U.S. with a wider area of tropical storm-force winds. High wind warnings are posted from Northern Michigan to Lake Okeechobee, Florida, and from Chicago to Maine. All-time low pressure records have been set at Atlantic City, NJ, Philadelphia, PA, and Wilmington Delaware. The rain is coming down in sheets along the east coast, where heavy rain stretches from Virginia to Pennsylvania and New York. Virginia Beach, VA has seen 9.26", Dover, DE has seen 6.36" and Ocean City, MD has seen 6.31". Some of the heaviest rain, apart from close to the center, is actually on the far western side, where a strong band of precipitation has set up running north to south from Erie, PA south to Pittsburgh, PA. This strong band of rain is moving west into Ohio. Wind gusts have been peaking above 80 mph in New York, Rhode Island, and Massachusetts this afternoon. The strongest gusts we've seen today include 86 mph at Westerly, RI, 84 mph on Plum Island, NY, and 83 mph on Cuttyhunk Island, MA. Sustained winds speeds of 40+ mph stretch from Delaware to Rhode island, with the strongest sustained wind closest to the center of circulation in Lewes, DE. All of this strong, onshore wind has been pushing huge amounts of water toward the shore, where it has nothing to do but pile up over land. As of 5pm EDT, here are the highest storm surges seen:
Kings Point, NY: 7.85 ft
Sandy Hook, NJ: 7.55 ft
Bridgeport, CT: 7.3 ft
New Haven, CT: 6.82 ft
The Battery, NY: 6.7 ft
New London, CT: 5.76 ft
Atlantic City, NJ: 5.69 ft
Lewes, DE: 4.46 ft
We just added live tide gauge heights on our wundermap, so you can follow the changes in surge as Sandy roars ashore.

Figure 1. MODIS satellite image of Hurricane Sandy taken at 2:20 pm EDT Monday, October 29, 2012. At the time, Sandy was a Category 1 storm with 90 mph winds. Image credit: NASA.
Sandy bringing high winds all the way to Chicago
The scope of this storm is truly astonishing. As Sandy combines with the fall low pressure system over the Northeast U.S., its circulation will intensify, and winds over the Great Lakes will increase. Storm warnings are posted for Tuesday on Lake Michigan near Chicago, where sustained 55 - 60 mph winds and waves of 20 - 25 feet are expected. Storm warnings are posted on Lake Erie and Lake Ontario, and high winds from Sandy blowing off of Lake Erie caused damage to signs in Port Clinton, Ohio this afternoon. Check out this webcam view of a very angry Lake Erie. High wind warnings extend from northern Michigan to Central Florida.
Sandy's storm tide peaking early this evening
Storm surge should peak between 7 - 8 pm, and high tide will peak a little later, 8 - 9 pm, depending upon location. The storm tide--how high the water gets above some reference point, commonly chosen to be the average of the daily lowest low tide of the month (Mean Lower Low Water, MLLW) is what we use to discuss how bad storm surge flooding is. The storm tide is the combination of the storm surge and the tide. At Sandy Hook, NJ, the storm tide has reached 10.11', and is still rising. This breaks the old record set by Hurricane Donna in 1960, and the Nor'easter of Dec 11th, 1992. As of 6 pm EDT, the storm tide at The Battery in New York City was 10.1'. The record is 10.5', set during Hurricane Donna of 1960. That also happens to be the level the Lower Manhattan subway system will flood, unless the defenses have been improved since last year's Hurricane Irene. High tide is at 8:53 pm. The rise in surge has slowed down, but the surge may not be slowing down fast enough to avoid record flooding in New York City.
Links for Sandy
An impressive 1-minute resolution satellite loop of Sandy today is at the CSU RAMMB website.
Hurricane Sandy info from NASA.
Joe Romm at climateprogress.org has a thoughtful piece called, How Does Global Warming Make Hurricanes Like Irene More Destructive?
Storm Surge prediction model from the Stevens Institute of Technology, which use a highly detailed 3D ocean model and even includes rainfall and tributary inflows.
Research storm surge model run by SUNY Stonybrook for New York City.
I have to cut this post a bit short due to the many media interviews I'm involved with, but will be back in the morning with much more.
Jeff Masters and Angela Fritz
Reader Comments
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Because science is just one person who keeps changing his mind and uses one single approach?
Modeling hurricane genesis rates in the Atlantic Basin is one of the most difficult things you can do. As you may have noticed, the number of hurricanes annually in the Atlantic ranges from zero to 15 and fluctuates wildly from year to year. As you may also have noticed, hurricane formation and development is a very nuanced, sensitive issue and the models for doing so are still evolving. Different people use different approaches at different point in time and try to reach conclusions.
The key thing is, that not only is there is a good deal of uncertainty, but it is *known* that there is said uncertainty in the results. Here's what Dr. Masters summed up once upon a time:
This is a *very* different statement from the IPCC's statements about other aspects of the climate system - ocean acidification, historic surface temperatures, future surface temperature trends, causes, etc. The various lines of data and approaches for modeling are in general much better understood and in accordance than tropical cyclone genesis, and yield a much higher confidence interval.
Can any New Yorkers help out Nick _______ & Alejandra ________??? Nick is on a vent, and they have no power in lower manhattan -
"Hello. Thanks everyone, for thinking of us. We, like many, finally lost power. Ventilator battery charging via FDNY generator going as planned but needs someone to take batteries up/down 12 flights. If anyone has any leads on portable power/charging/generator options, pl
ease advise. We have phones and feeding pump, suction machine, oxygen concentrator & wheelchair that could use power. We'll probably need some food soon. This could go on a while, so ANY help appreciated.
(Evacuating to hospital is very risky for us & esp. Nick, won't be considered unless all else fails, so please don't suggest it.) --"
Climate scientists are uncertain of the precise link between GW and tropical cyclones. In some ways, those cyclones should be made stronger; in others, less so. But just because they're uncertain about the exact connection between the two doesn't in any way mean they're uncertain that there is a connection; after all, medical scientists are still unsure of the exact mechanism by which aspirin works, but they're absolutely certain that it does work.
Try not to confuse the two...
That science is pointing to more of what we've been experiencing recently. No matter what party/religion/sports team/beer you prefer... climate change is happening and we can't at this point stop what we've started, but we can still help mitigate its effects on our society.
This is entirely appropriate for a weather site. Sandy is the topic here, but what helps generate events like Sandy is pertinent as well. We can walk and chew gum at the same time, we can help those in need right now, and discuss what happened and why as well.
*Back to lurking
38.3n73.1w 39.5n74.5w 40.3n76.3w has been re-evaluated&altered
38.3n73.0w 39.5n74.5w 39.9n76.4w 40.0n77.9w are now the most recent positions
PIT-Pittsburgh :: 8PN0-Chambersberg :: 9W8-Brogue :: AIY-AtlanticCity
Click this link to the GreatCircleMapper for a larger map with more info
And the previous mapping for comparison
(Although I should note: elementary school physics teaches us that warmer temperatures do, indeed, melt ice.)
wow comparing tropical cyclones with asprins to gw; you sure cleared the confusion....
I'm confused about all the folks who are crying about hurricane warnings not being posted. Doesn't a hurricane warning indicate that hurricane conditions (sustained wind speed > 74 mph) are expected? Since that is a pretty rigid criteria and those conditions didn't happen, why were they wrong? Perhaps they should have issued a "really scary storm" warning.
SNOWFALL TOTALS
---------------
SELECTED STORM TOTAL SNOWFALL IN INCHES THROUGH 11 AM EDT
..KENTUCKY...
LYNCH 3S 12.0
ELKO 1NW 9.0
BENHAM 3S 6.0
...MARYLAND...
REDHOUSE 26.0
GARRETT 26.0
DEEP CREEK LAKE 20.0
OAKLAND 12.0
...NORTH CAROLINA...
BAKERSVILLE 6N 8.0
FAUST 4NW 6.0
LANSING 6NW 5.0
CRESTON 4.0
...PENNSYLVANIA...
CHAMPION 4SE 13.0
MOUNT DAVIS 9.0
LAUREL SUMMIT 6.0
...VIRGINIA...
TAZEWELL 1E 5.0
CLINTWOOD 2WSW 4.0
BURKES GARDEN 3.0
...WEST VIRGINIA...
DAVIS 23.0
BAYARD 19.0
TERRA ALTA 1N 18.0
WEBSTER SPINGS 17.0
FAYETTEVILLE 11E 15.0
SHADY SPRING 14.0
MORGANTOWN 3SE 12.0
SNOWSHOE 1S 11.0
Hey, I noticed!
*now really back to lurking
Good question.
I have no answer but I am curious to hear the input of others so I am bumping it up for you. :)
Really scarey storm warnings were issued. Hurricane winds were expected & did happen. Note it was a smaller area than the area affected by snow.
WIND GUSTS
---------------
ISLIP NY 90 MPH
2 N TOMPKINSVILLE NJ 90 MPH
SURF CITY NJ 89 MPH
TUCKERTON NJ 88 MPH
1 N MONTCLAIR NJ 88 MPH
MADISON CT 85 MPH
PLUM ISLAND NY 84 MPH
CUTTYHUNK MA 83 MPH
DENNISVILLE 81 MPH
SANDY HOOK NJ 81 MPH
WELLFLEET MA 81 MPH
JFK NY 79 MPH
NEWARK NJ 78 MPH
ATLANTIC CITY NJ 77 MPH
GROTON CT 76 MPH
HARVEY CEDARS NJ 75 MPH
I believe that the definition of a hurricane requires sustained winds of >74 miles per hour, not gusts. Find me the sustained winds that met the criteria.
snort... "I" watch, you were first ... again...
I agree with you, but here are some thoughts. There will be vocal comments no matter what decision the NWS makes. Any direction they go, they'll be criticized. In cases like this, especially for a governmental body, they are going to follow their documented protocol. They made the decision to follow their guidelines and allow local weather services to manage the alerts. It wasn't a bad idea. Most people pay more attention to local services than the NWS. I'm neither agreeing nor disagreeing with them, but what can you do when you know any decision is going to be looked at negatively.
the theory has been around, but understanding every detail or consequence of the "basic concept" of a theory is not very easy.
Take the theory of Relativity, for example, the concept that light's speed never changes isn't so hard, the math to describe the effects of it, and then TEST the theory, now that's complicated.
Take a look at SST anomalies from yesterday when the storm was offshore and near peak intensity.
Widespread pocket of 1C above average, with a sliver of 2C to 3C above average temperatures.
What's the rule on convection? 4.5% convection increase per degree temperature increase?
Forecasting the number and intensity of storms is pretty weird.
I forecasted 15 to 16 named storms and I forget how many majors, and I assumed it would be a "front heavy" season. This is 18.
My number came from simply taking 1/2 and 2/3rds of the average neutral year and adding 1/2 and 1/3rd of the average el nino year to each number respectively, but even that is just a statistical/climatological approach. i.e. forecasting what climatology does in a year where el nino should start at half or 2/3rds of the season.
It ended up being a bit low for named systems, and a total bust on SS wind scale majors, but not so big a bust on "storm surge major equivalents".
So over all, "scientific," but very little skill, yet I beat the guys with super computers using only a few minutes worth of thought, yet even my number was too low by 20% (so far).
Other times I've been totally and ridiculously wrong, even when I could likewise make a rational argument why it should have worked.
so I hope that demonstrates how different and difficult this field of meteorology and climatology really is when the real number of storms ended up being nearly twice the best scientific forecast, and 20% above my "pieced climatology" forecast.
Once we replace Saffir-Simpson, it should be a no brainer to use the same scale for any ocean to land event, Nor'easter or Hurricane.
So instead of saying Hurricane Watch or Warning, or Gale/Wind etc. The main category classification should be based on surge anyways, but that's a different discussion.
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