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Satelllite image of tropical storm Hanna from NOAA
September is National Preparedness Month. Are you ready for tropical storm Hanna? While today is an enjoyably warm and sunny September day, tomorrow will be anything but. Today's high should be in the breezy, humid mid-80s. Clouds should arrive this evening and rain should follow, perhaps as early as midnight tonight.
If Hanna continues on the predicted path, the city could be in for lots of rain and wind tomorrow and tomorrow night. The storm is expected to come ashore this evening near the border of the Carolinas. As it moves inland Hanna will get caught in the strong southerly flow of air that's making today so warm and sticky. Once in that flow the storm is will zoom up the coast, passing just east of the city late Saturday night. Should that prediction pan out 3-6 inches of rain, more in some locations, could fall over the city. To that end a flood watch has been issued for southeastern New York, southern Connecticut and eastern New Jersey. Winds will pick up to a steady 20-30 miles an hour tomorrow evening and thunderstorms are possible as Hanna passes through the area.
The storm should move fast enough that Sunday's weather will be relatively decent. Showers may linger until around noon. Afterwards a strong northerly breeze will usher in drier air and the skies should clear up by evening. Expect Sunday's high to be in the low-80s. Next week should start quietly, which should give us time to fret about Hurricane Ike.
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Why do they always issue flood warnings? Has the city had a flood in the last 10 years? No. When was the last time an actual flood occurred?
Does it have to be a whole citywide New Orleans style flood? Doesn't that mean certain flood prone streets could be flooded?
Yes, that's exactly what it means. ^
Also, don't the subways get flooded?
You crazy.
If NYC is wet, chances are it's flooding somewhere.
Flooding occurs in NYC.
On highways, during heavy rain, there are very small areas with design flaws where there will collect water, and have a 3 to 9 inch deep pool, and you don't want your car to get in there.
Flood occurs under some bridges, and your car can die on the spot. And if you have a house, and if the rain is unable to go down a public drain because it is surrounded by garbage, the rain will come into your basement.
If the waterproof seals along the wall and the ground to your home is not working, your basement will be flooded.
Not all roads were designed, or maintained correctly, so that the middle is raised, and force rain water to go to the sides, and hopefully down a sewage drain.
During the last 20 years, NYC subway is infamous for blaming rain and flood on stopping its trains. I remember reading here in Gothamist.com, that MTA subway pumps are not effective or there aren't enough pumps to pump water out of the subway.
testing
One thing is probably for sure - Expect delays throughout our mass transit system (MTA Bus, NYCT, LIRR, MNRR)
The issue with the subways is that on a normal, dry day, the subway system is already pumping out 13 MILLION gallons of water. So on a rainy day--especially one with lots of rain coming down fast--it's very hard for the system to keep up. That's when the MTA has to bring out portable pumps to get the water out.
Oh, and don't toss your newspapers into the tracks, either. Not only do they cause track fires, they don't help with drainage.