The January Thaw in New England * (An Example of a Weather Singularity)

Wahl, Eberhard W.

doi:10.1175/1520-0477-33.9.380

Cited by 22 publications

(5 citation statements)

References 1 publication

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“…The results presented above suggest a general quasi-periodic pattern of fluctuations in the normal temperatures over various parts of Canada. Similar fluctuations in the normal temperature records at selected locations in the northeastern United States have been documented by Wahl (1952) in his studies on the January thaw in New England. According to Wahl the January thaw at Boston is only a part of a much larger phenomenon, namely a change-over from a westerly circulation pattern to a northwesterly flow pattern.…”

Section: Resultssupporting

confidence: 76%

A note on fluctuations in the normal temperature trend at selected Canadian stations

Strong

Khandekar

1975

Atmosphere

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Section: Resultssupporting

confidence: 76%

A note on fluctuations in the normal temperature trend at selected Canadian stations

Strong

Khandekar

1975

Atmosphere

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“…The spring minimum varies from day 95 in Georgia to day 137 in Maine. In the most northern states (Maine, Vermont, New Hampshire, New York) the spring R minimum follows an earlier one, possibly indicative of the ''January thaw'' (Wahl 1952;Hayden 1976). This minimum ap-pears only in the relative humidity; it is not present in the corresponding specific humidity series.…”

Section: Mean Conditions In Spring a Seasonal Patterns Of R Along Thmentioning

confidence: 97%

Climatic Consequences of Leaf Presence in the Eastern United States

Fitzjarrald¹,

Acevedo²,

Moore³

2001

J. Climate

144

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At the time of leaf emergence in deciduous forests, markedly enhanced evapotranspiration leads to a rapid drop in the Bowen ratio. A small fraction of this surface flux alteration converges into the boundary layer, and this can be detected in the mean temperature and humidity daily increments at the surface. A simple technique is presented for identifying this response in surface climate data and extracting time series for the date of spring onset and for the ''spring intensity,'' a measure of surface energy budget partition change in spring. A tendency Bowen ratio BЈ is found from changes in the daily increment of temperature and humidity in multidecadal averages. The spring date determined using this criterion for stations along the U.S. east coast corresponds to the date at which the normalized difference vegetation index (NDVI) reaches 80% of its seasonal maximum. Northward movement of the vernal front is similar to that obtained using Hopkins' empirical rule; it is linearly related to leaf emergence and flowering dates from the North American lilac phenology network. Spring intensity increases northward; the states from Virginia north exhibit distinctly higher values. There has been a trend in the most recent decades toward earlier spring dates, except for regions in Virginia and North Carolina. The same analyses performed using the small subset of stations with longer-term records indicate that a trend toward an earlier spring date is confined to recent decades. An inverse relationship between the spring date and spring average temperature was found for the Midwest but is inadequate for the northeast. Spring intensity has generally increased in northeastern North America throughout the twentieth century. However, large oscillations with an approximate 20-yr period distinguish the northeastern United States from the Midwest, indicating that the intensity of spring is not a simple function of spring temperature or of forest cover fraction.

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“…This singularity appears to be as important as the "January Thaw" singularity investigated earlier by the author [2] and constitutes another link in the "normal course of weather development" on our continent.…”

Section: Of Their Paper)mentioning

confidence: 55%

A Weather Singularity over the U. S. in October

Wahl¹

1954

Bulletin of the American Meteorological Society

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A sudden increase in the probability of snow occurrence during the month of October at Denver, Colorado, had been reported. It is shown that this increase can be associated with the development of a widespread weather singularity occurring at that time of the year. The normal sea-level pressure-pattern changes derived from 40 years of data over the United States show the synoptic development of this singularity. This development leads to peculiarities in various weather elements at that time.

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The January Thaw in New England * (An Example of a Weather Singularity)

Cited by 22 publications

References 1 publication

A note on fluctuations in the normal temperature trend at selected Canadian stations

A note on fluctuations in the normal temperature trend at selected Canadian stations

Climatic Consequences of Leaf Presence in the Eastern United States

A Weather Singularity over the U. S. in October

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