With adverse effects from the central Appalachians well into New England, Sandy will long be remembered for the unusual mix of weather conditions it brought millions of people across the Eastern Seaboard.
As the numbers continue to come in, let’s take a look at some of Sandy’s most impressive weather data:
With a minimum central pressure of 940 mb while churning off the New Jersey coast, Sandy was one of the strongest storms to strike the Northeastern U.S. in decades. As it made landfall just south of Atlantic City, N.J., Sandy had begun transitioning to a post-tropical storm. At that time its central pressure measured 946 mb, making it the second-lowest pressure of any storm to make landfall north of Cape Hatteras, N.C. For historical comparison, only the Long Island Express Hurricane of 1938 had a lower pressure reading (941 mb) at landfall. As a rule of thumb, the lower the pressure, the more intense the storm.
Areas under Sandy’s impact zone also recorded historically low pressures. Consider these all-time record low pressure readings (from Wunderground’s Jeff Masters):
- 948 mb in Atlantic City, N.J. (old record: 961 mb on 3/6/1932)
- 953 mb in Philadelphia, Pa. (old record: 963 mb on 3/13/1993)
- 958 mb in Trenton, N.J. (old record: 963 mb on 3/13/1993)
- 964.4 mb in Baltimore, Md. (old record: 965.9 mb on 3/13/1993)
Hagerstown, Md. also recorded a record low pressure of 969 mb, just below the prior record of 970 mb set during the March 13, 1993 superstorm.
Sandy’s wind field was already impressive days before it pummeled the coast. More than 24 hours prior to landfall, winds extended some 520 miles from the storm’s center of circulation. As Sandy came ashore in New Jersey, several locations along the East Coast recorded hurricane-force wind gusts. Here’s a summary of data reported (h/t: AccuWeather and SI Weather):
-96 mph: Eaton’s Park
-90 mph: Islip
-79 mph: JFK Int’l Airport
-74 mph: LaGuardia Airport
-62 mph: Central Park
New Jersey, Pennsylvania
-89 mph: Surf City, N.J.
-88 mph: Montclair, N.J.
-78 mph: Newark Int’l Airport, N.J.
-81 mph: Allentown, Pa.
-68 mph: Philadelphia Int’l Airport
In the greater Washington, D.C. area, Sandy brought slightly lower wind gusts generally, but isolated gusts topped 80 mph, including a 90 mph gust at the Chesapeake Bay Bridge. Some other notable gusts:
-79 mph: Thomas Point, Md.
-79 mph: Chester Gap, Va.
-76 mph: Laytonsville, Md.
-61 mph: Reagan National Airport
-60 mph: Baltimore-Washington (BWI) Airport
CapitalClimate summarizes several new precipitation records for October 29 across the mid-Atlantic and Northeast (old records in parentheses):
-3.85” in Washington D.C., at Reagan National Airport (2.69” in 1885)
-2.68” in Philadelphia (1.72” in 1953)
-4.79” in Atlantic City, N.J. (2.33” in 1908)
-3.79” in Wilmington, Del. (2.56” in 1953)
The NWS also reported that Oct. 29 set new records for the wettest October calendar day at both Washington-Dulles and BWI International Airports. At Dulles, 4.25” of rain fell, breaking the previous record-wettest October calendar day of 4.06” from Oct. 1, 1979. At BWI, 5.51” of rainfall on Monday broke Baltimore’s earlier record-wettest October calendar day of 4.38” from Oct. 10, 1922.
AccuWeather has an excellent list of the highest rainfall totals recorded in states affected by Sandy. Not far from D.C., Easton, Md. recorded 12.55”, which puts it near the top of the list.
Sandy’s unusual development as a tropical system merging with a winter cold front brought high elevations very heavy snowfall – rare even for this time of year. Redhouse, Md. (Garrett County) measured an impressive 28 inches, topping the list for greatest accumulation among the eight states that saw measurable snowfall. Unofficial observations suggest even higher amounts, including more than 28” in Davis, W.Va. In some places, it’s still snowing.
Sandy’s snow output covered an enormous area. All told, the storm dumped more than a foot of snow in Virginia, West Virginia, Pennsylvania, North Carolina, Tennessee, and Kentucky. Perhaps most unusual were the snow accumulations in the south-central Appalachians, including an incredible 22” in Newfound Gap stradling the line between North Carolina and Tennessee.
Of course, Sandy’s greatest impact was the combination of high wind and rain that brought destructive storm surges and flooding to many coastal areas. Storm surges were enhanced by a full moon, which allowed water levels to crest several feet above normal tides. Major storm surge damage stretched from Chincoteague, Va. through Atlantic City, New Jersey to Rhode Island.
New York City was especially hard hit as Sandy’s onshore (northeasterly) winds drove water into Brooklyn and lower Manhattan. The New York Times reported of seawater flooding seven subway tunnels under the East River and of submerged runways at both JFK and LaGuardia airports.
-14.38 ft at Kings Point, N.Y.
-13.88 ft at The Battery, Lower Manhattan
-13.31 ft at Sandy Hook, N.J.
The 13.88 ft water level at the Battery surpassed the old record of 10.02 ft measured there during Hurricane Donna in 1960 and also eclipsed an estimated 11.2 ft water level seen during a hurricane in 1821.
From storm surges to flooding rains and destructive winds, Superstorm Sandy has left its meteorological mark as the Northeast begins to recover from its destructive force.
Did climate change contribute to Hurricane Sandy’s devastation? (NY Times blog)