Science & Technology

Tropical Storm Henri Soaks the Northeast With Intense Rain

August 19 – 23, 2021

Henri didn’t attain the northeast U.S. coast at hurricane drive, however the slow-moving storm nonetheless left a soggy mark on the area because it turned a uncommon tropical cyclone to make landfall in New England. Months of rain fell in a couple of hours throughout New Jersey, New York, and a number of other different states from August 21-23, touchdown on soils that have been already soaked by an excessively moist summer time.

Tropical Storm Henri made landfall close to Westerly, Rhode Island, on August 22, 2021, with sustained winds of 60 miles (95 kilometers) per hour and gusts to 70 mph (110 kmph). In anticipation of the storm, the cities of Windfall, Rhode Island, and New Bedford, Massachusetts, raised storm surge limitations of their ports for the first time since Hurricane Sandy in 2012. However the storm surge by no means turned as extreme as feared.

Rainfall was a distinct story. Widespread accumulations of 4 to 9 inches (10 to 23 centimeters) have been recorded in New York, New Jersey, Pennsylvania, and Connecticut. A lot of that rainfall fell to the western aspect of the storm, whereas the japanese and northern sides noticed extra average rainfall.

Whole Rainfall – August 19 – 23, 2021

A broad satellite tv for pc estimate of rain distribution is captured in the map above, which exhibits information from August 19–23, 2021. The info are remotely-sensed estimates that come from the Built-in Multi-Satellite tv for pc Retrievals for GPM (IMERG), a product of the International Precipitation Measurement (GPM) satellite tv for pc mission. Native rainfall quantities might be considerably larger when measured from the floor.

The opposite map (under) describes how moist the soil was earlier than Henri even arrived. Utilizing information from the Crop Situation and Soil Moisture Analytics (Crop-CASMA) product, the map exhibits soil moisture anomalies on August 21, 2021, or how the water content material in the prime meter (3 toes) of soil in comparison with regular circumstances for the time of 12 months. Crop-CASMA integrates measurements from NASA’s Soil Moisture Energetic Passive (SMAP) satellite tv for pc and vegetation indices from the Average Decision Imaging Spectroradiometer (MODIS) devices on NASA’s Terra and Aqua satellites.

Soil Moisture Anomaly – August 21, 2021

Henri meandered throughout the Atlantic towards New England for a number of days, and likewise moved slowly after landfall. Some meteorologists pointed to a blocking ridge of excessive strain over the North Atlantic that saved the storm from transferring east and northeast because it normally would. Whereas nonetheless effectively offshore, Henri turned related to different climate methods alongside the East Coast that pulled in moisture from the outer edges of the storm to impress downpours.

The soaking began half a day earlier than Henri made landfall. Gauges in New York Metropolis’s Central Park recorded 1.94 inches of rainfall between 10 and 11 p.m. on August 21, and a complete of 8.19 inches by the time the storm had handed on August 23. One other 9.95 inches fell in Brooklyn. In New Jersey, the city of Cranbury was soaked with 8.91 inches, whereas Oakland caught 9.22 inches. Ardmore, Pennsylvania, recorded 4.25 inches, whereas New London, Connecticut—simply west of the landfall—obtained 3.71 inches.

“Henri’s sluggish westward-then-eastward loop throughout southern New England over a interval of greater than 24 hours whereas nonetheless categorised as a tropical cyclone is extraordinarily uncommon if not unprecedented,” wrote meteorologist Bob Henson in a blog post. “Almost all tropical depressions, tropical storms, or hurricanes in the area transfer extra quickly north or northeast, hauled towards the Atlantic by robust upper-level winds extra typical at that latitude than the exceptionally weak steering currents current on Monday.”

The soaking rain from Henri fell on a area that was already enduring certainly one of its top three wettest summers on document. In accordance with the National Weather Service, greater than 23 inches of rain have fallen on New York Metropolis since June 1. A typical June by way of August interval brings 12 inches.

NASA Earth Observatory photographs by Joshua Stevens, utilizing soil moisture information from Crop Situation and Soil Moisture Analytics (Crop-CASMA) and IMERG information from the International Precipitation Mission (GPM) at NASA/GSFC.

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