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- Author or Editor: HANS E. ROSENDAL x
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Abstract
The year 1843 produced some unusually cold months in the upper Mississippi Valley, with March about 25°F below normal for the largest monthly departure of record in the area. A short summary of the winter months of 1842–43 in Wisconsin is included. A check of climatological data for Europe showed that unusually mild weather prevailed in eastern Europe during January and February 1843, while March 1843 was near normal. The effects of snow and ice cover in maintaining a strong and persistent anomalous flow pattern is alluded to. A high frequency of record coldest and warmest months in Wisconsin occurred during the 1830's and 1840's. High dust content of the upper atmosphere from frequent volcanic activity with reduced incoming solar radiation during the 1830's may be partially responsible for the occurrence of the many cold months.
Abstract
The year 1843 produced some unusually cold months in the upper Mississippi Valley, with March about 25°F below normal for the largest monthly departure of record in the area. A short summary of the winter months of 1842–43 in Wisconsin is included. A check of climatological data for Europe showed that unusually mild weather prevailed in eastern Europe during January and February 1843, while March 1843 was near normal. The effects of snow and ice cover in maintaining a strong and persistent anomalous flow pattern is alluded to. A high frequency of record coldest and warmest months in Wisconsin occurred during the 1830's and 1840's. High dust content of the upper atmosphere from frequent volcanic activity with reduced incoming solar radiation during the 1830's may be partially responsible for the occurrence of the many cold months.
Abstract
Data are presented from a mesoscale network of integrating pyranometers established in Wisconsin, for the period December 1966 through June 1967. The data have been normalized so that they are expressed as a percent of the clear day global radiation values. The monthly values for the percent of the clear day global radiation received over the State, ranged from 72.3 to 58.4 percent. For the 7 months examined, the gradients across the State ranged from 5.5 to 12.8 percent of the possible global radiation. Maps of the monthly distribution patterns have been presented. These have been interpreted in the light of the prevailing weather systems.
Abstract
Data are presented from a mesoscale network of integrating pyranometers established in Wisconsin, for the period December 1966 through June 1967. The data have been normalized so that they are expressed as a percent of the clear day global radiation values. The monthly values for the percent of the clear day global radiation received over the State, ranged from 72.3 to 58.4 percent. For the 7 months examined, the gradients across the State ranged from 5.5 to 12.8 percent of the possible global radiation. Maps of the monthly distribution patterns have been presented. These have been interpreted in the light of the prevailing weather systems.
Abstract
A mean sea level pressure map is drawn for the North Atlantic Ocean for the period of the Atlantic Coast storm of March 5–9, 1962 and anomaly and normalized departure charts are presented. A comparison is made with the January 8–12, 1956 storm during which some of the greatest pressure anomalies associated with severe extratropical coastal storms of the 20th century occurred. It is noted that in the typical northeaster a ridge usually extends east-southeastward or southeastward over the North Atlantic Ocean from a High located over eastern Canada and Labrador. The ridge was very weak in the March 1962 situation and the resulting pressure pattern produced winds with easterly components of an unusually long fetch from the British Isles to the coastal waters of the United States.
Return periods or mean recurrence values were computed, from an extreme value probability analysis based on 17 years of 5-day mean sea level pressure grid point data, for the intensity of cyclones and anticyclones associated with the March 1962 and January 1956 storms. The extreme easterly flow was computed between 35° and 45° N. from 55° to 75° W. and return periods of 18 years and 11 years were found for the January 1956 and March 1962 storms, respectively.
Abstract
A mean sea level pressure map is drawn for the North Atlantic Ocean for the period of the Atlantic Coast storm of March 5–9, 1962 and anomaly and normalized departure charts are presented. A comparison is made with the January 8–12, 1956 storm during which some of the greatest pressure anomalies associated with severe extratropical coastal storms of the 20th century occurred. It is noted that in the typical northeaster a ridge usually extends east-southeastward or southeastward over the North Atlantic Ocean from a High located over eastern Canada and Labrador. The ridge was very weak in the March 1962 situation and the resulting pressure pattern produced winds with easterly components of an unusually long fetch from the British Isles to the coastal waters of the United States.
Return periods or mean recurrence values were computed, from an extreme value probability analysis based on 17 years of 5-day mean sea level pressure grid point data, for the intensity of cyclones and anticyclones associated with the March 1962 and January 1956 storms. The extreme easterly flow was computed between 35° and 45° N. from 55° to 75° W. and return periods of 18 years and 11 years were found for the January 1956 and March 1962 storms, respectively.
