“March 1969 nor'easter”的意思、由来-开放百科全书

The March 1969 nor'easter was an extratropical cyclone that moved into the Gulf of Mexico on March 5, moving through southern Georgia, then deepened as it moved along the lower Eastern Seaboard, before swinging wide of New England and Atlantic Canada. Heavy snows fell across eastern Maryland, southern Delaware, and Martha's Vineyard in Massachusetts. It was a strong system, with maximum sustained winds of {{convert|80|kn|km/h|abbr=on}} a central pressure close to {{convert|950|hPa|inHg|abbr=on}} while south of Atlantic Canada. The system then moved into the far northern Atlantic Ocean while splitting into two low pressure areas on March 10.

Evolution

Late on March 5, a frontal wave moved offshore Galveston, Texas. The system moved along the Gulf coast on March 6.^[1] Gale-force winds were confined to behind its prefrontal squall line on March 6. The cyclone moved along the Florida-Georgia border with a central pressure down to {{convert|995.0|hPa|inHg}}. The low tracked up the Eastern Seaboard from the late on the 6th through the morning of the 7th while strengthening quickly, with its central pressure falling to {{convert|969.0|hPa|inHg}}, then with storm-force winds offshore Cape Charles, Virginia. The cyclone tracked offshore New England. By the morning of the 8th, the cyclone's center pressure had fallen to {{convert|950.0|hPa|inHg|abbr=on}} while the system developed maximum sustained winds of {{convert|80|kn|km/h}} south of Newfoundland.^[1] During the day, the cyclone absorbed a previously strong cyclone to its north near Anticosti Island. The system slowly weakened while moving slowly northeast offshore eastern Newfoundland on the 9th and 10th, losing hurricane-force winds on the 9th. The system split into two distinct low pressure centers on 10th as it approached southern Greenland.^[2]

Impact

The cyclone's pre-frontal squall line moved into western Florida between 4:30 and 6:00 p.m. on March 6. Winds gusted to between {{convert|45|mph|km/h}} and {{convert|60|mph|km/h}} across Sarasota and Levy counties. Tides rose to between {{convert|3|ft|m}} and {{convert|4|ft|m}} above normal. Damage caused was between $50,000 and $500,000. A heavy wet snow fell across the Eastern Shore of Maryland and the southern half of Delaware from late on March 6 into March 7, up to a depth of {{convert|7|in|cm}} in Maryland and {{convert|12.5|in|cm}} in Lewes, Delaware. At Martha's Vineyard, heavy snow and winds up to {{convert|50|mph|km/h}} created snow drifts exceeding {{convert|3|ft|m}} in height.^[3]

References

1. ^¹{{cite journal|journal=Mariners Weather Log|page=160|date=July 1969|volume=13|number=4|editor=Richard W. Schwerdt|publisher=Department of Commerce|title=Letter to the Editor}}
2. ^{{cite journal|journal=Mariners Weather Log|pages=181–182|date=July 1969|volume=13|number=4|editor=Richard W. Schwerdt|publisher=Department of Commerce|title=Rough Log, North Atlantic Weather March–May 1969}}
3. ^{{cite journal|journal=Storm Data|volume=11|number=3|date=March 1969|pages=20–21|publisher=Environmental Data Service|title=Delaware, Florida, Maryland, and Massachusetts}}