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Moderate Risk Of Severe Weather For Northeast U.S.

By: Shaun Tanner , 8:43 PM GMT on September 07, 2012

The Storm Prediction Center has upgraded the severe risk in the Northeast U.S. for Saturday to moderate. This represents a significant threat to heavily-populated areas.

The SPC Convective Outlook for Saturday.

As noted in the image above, the moderate risk area extends from the border of Maryland and Pennsylvania northward into Vermont and New Hampshire. Some large cities in the moderate risk area include New York City, Philadelphia, Newark, Hartford, and Albany. In addition, a slight risk has been issued for the surrounding area as far south as North Carolina through Maine.

The main threat will be strong, intense winds, large hail, and the possibility of tornadoes. Needless to say, residents in the entire Northeast will need to prepare to protect life and property from this significant threat.

The strengthening cold front that may eventually bring severe weather to the Northeast was stretched from the Plains through the Ohio Valley on Friday, where it was producing some impressive temperature gradients of 100s ahead of the front and 60s behind it. As this front strengthens and moves eastward, it will likely produce a damaging squall line, where the threat will be very heavy rain along with strong winds and large hail. The intensity of the rain could produce flash flooding in exposed areas. However, a more significant threat may actual form ahead of this front. Supercells capable of developing very strong tornadoes will actually form well ahead of the main cold front. Thus, while the cold front will not arrive in places like New York City and Philadelphia until the late afternoon, supercells could enter the region ahead of this.

Best Ways To Prepare For Severe Weather

It is important to prepare for severe weather well before it happens. THAT MEANS NOW! Weather Underground has put together a weather preparedness section to assist in getting weather for this severe weather threat. One fantastic way to prepare and protect yourself for severe weather is to buy a weather radio. These radios broadcast special frequencies that alert owners of hazards.

As always, Weather Underground will be covering any severe weather outbreak on twitter, so make sure you follow us so you stay informed.

You can always bookmark a few important Weather Underground pages:

Weather Underground's severe map will show you all active warnings during any potential outbreak.

The WunderMap is hands down the best way to follow severe weather. The link provided will take you to a zoomed in version of the WunderMap with radar turned on. This will let you know where the severe is, how intense the outbreak is, and when it potentially could come to your neighborhood.

The views of the author are his/her own and do not necessarily represent the position of The Weather Company or its parent, IBM.

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2. Beeweather
7:50 PM GMT on September 13, 2012
When looking at weather history for a location I see something confusing. The total precipitation is shown for that day, but if you total up the precipitation that is shown on the table for each half hour of the day you get a different total. The amount from the table is usually higher.

Why is there a difference?
Member Since: December 31, 1969 Posts: Comments:
1. pcola57
3:34 AM GMT on September 09, 2012
Thanks Shaun for your post..
I appreciate your explanation of the front and the interactions...
Thanks again..
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Wunderground Meteorologist Shaun Tanner

About shauntanner

Shaun Tanner has been a meteorologist at Weather Underground since 2004.

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