Seasonal Variation in Extreme Rainfall Over the Northeastern United States

1965 ◽  
Vol 8 (2) ◽  
pp. 0180-0182
Author(s):  
C. A. Cromer and W. H. Dickerson ◽  
Jr.
Keyword(s):  
United States ◽  
Seasonal Variation ◽  
Extreme Rainfall ◽  
Northeastern United States

scholarly journals Structure and Evolution of Precipitation along a Cold Front in the Northeastern United States

2009 ◽  
Vol 10 (5) ◽  
pp. 1243-1256 ◽  
Author(s):  
Yan Zhang ◽  
James A. Smith ◽  
Alexandros A. Ntelekos ◽  
Mary Lynn Baeck ◽  
Witold F. Krajewski ◽  
...  
Keyword(s):  
United States ◽  
New York ◽  
New Jersey ◽  
Heavy Rainfall ◽  
Frontal Zone ◽  
Extreme Rainfall ◽  
Convective Precipitation ◽  
Northeastern United States ◽  
Flash Flooding ◽  
Urban Corridor

Abstract Heavy precipitation in the northeastern United States is examined through observational and numerical modeling analyses for a weather system that produced extreme rainfall rates and urban flash flooding over the New York–New Jersey region on 4–5 October 2006. Hydrometeorological analyses combine observations from Weather Surveillance Radar-1988 Doppler (WSR-88D) weather radars, the National Lightning Detection Network, surface observing stations in the northeastern United States, a vertically pointing lidar system, and a Joss–Waldvogel disdrometer with simulations from the Weather Research and Forecasting Model (WRF). Rainfall analyses from the Hydro-Next Generation Weather Radar (NEXRAD) system, based on observations from WSR-88D radars in State College, Pennsylvania, and Fort Dix, New Jersey, and WRF model simulations show that heavy rainfall was organized into long-lived lines of convective precipitation, with associated regions of stratiform precipitation, that develop along a frontal zone. Structure and evolution of convective storm elements that produced extreme rainfall rates over the New York–New Jersey urban corridor were influenced by the complex terrain of the central Appalachians, the diurnal cycle of convection, and the history of convective evolution in the frontal zone. Extreme rainfall rates and flash flooding were produced by a “leading line–trailing stratiform” system that was rapidly dissipating as it passed over the New York–New Jersey region. Radar, disdrometer, and lidar observations are used in combination with model analyses to examine the dynamical and cloud microphysical processes that control the spatial and temporal structure of heavy rainfall. The study illustrates key elements of the spatial and temporal distribution of rainfall that can be used to characterize flash flood hazards in the urban corridor of the northeastern United States.

Phosphorus Deficiency and its Variation among Lakes

1990 ◽  
Vol 47 (6) ◽  
pp. 1077-1084 ◽  
Author(s):  
David J. Currie
Keyword(s):  
United States ◽  
Seasonal Variation ◽  
Water Chemistry ◽  
Rate Constant ◽  
Seasonal Variability ◽  
Bacterial Abundance ◽  
Phosphorus Deficiency ◽  
Northeastern United States ◽  
P Deficiency ◽  
P Concentration

The severity of phosphorus deficiency varies greatly among lakes. Is this variation related to particular morphological, chemical, or biological characteristics of lakes? These questions were addressed by sampling 49 lakes in Quebec, Ontario, and the northeastern United States. The rate constant of orthophosphate uptake (k1), a measure of orthophosphate demand:supply, proved to be only weakly related to watershed area and to the total phosphorus (P) concentration of the water (R2 = 0.210). Abundance of the biota and other aspects of water chemistry were all unrelated to the intensity of P-deficiency as it varies among lakes. In contrast, within-lake seasonal variability of the rate constant of orthophosphate turnover (kt, which is approximately equal to k1) is strongly related to temperature and bacterial abundance (R2 = 0.575 to 0.828). The results indicate that the seasonal variation in phosphorus deficiency depends strongly on bacterioplankton activity, whereas inter-lake variability in phosphorus deficiency is determined mainly by factors other than morphometry, plankton abundance, or trophic richness.

Monitoring air quality in class I wilderness areas of the northeastern United States using lichens and bryophytes

2016 ◽  
Author(s):  
Alison C. Dibble ◽  
James W. Hinds ◽  
Ralph Perron ◽  
Natalie Cleavitt ◽  
Richard L. Poirot ◽  
...  
Keyword(s):  
United States ◽  
Air Quality ◽  
Class I ◽  
Northeastern United States ◽  
Wilderness Areas
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