Letter Report on a Technical Peer Review of the Buzzards Bay Risk Assessment (2013) / Chapter Skim
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Pages 60-73
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60 Enclosure H Weather Analysis WIND AND WEATHER The BBRA report provides an analysis of winds from the National Oceanic and Atmospheric Administration (NOAA) National Data Buoy Center (NDBC)
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61 FIGURE G-1 Location of the NOAA NDBC BUZM3 station at the entrance to Buzzards Bay. FIGURE G-2 Average wind speed (knots)
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62 FIGURE G-3 Average significant wave height (m) and standard deviation versus time (months in the year)
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63 winds can be considered as a proxy for waves. Specifically, one can expect the strongest winds and waves to be in alignment.
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64 FIGURE G-5 U.S. Army Corp of Engineers WIS hindcast sites in the vicinity of the entrance to Buzzards Bay.
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65 TABLE G-2 Probability Distribution of Wave Height and Period for All Directions at WIS Site 63075
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66 FIGURE G-6 Wind rose at WIS Site 63075.
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67 FIGURE G-7 Wave rose at WIS Site 63075. In summary, adverse weather constraints selected are never clearly stated.
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68 FIGURE G-8 Footprint of visibility observations from selected airports in the vicinity of Buzzards Bay, all airports (upper panel) and New Bedford Regional Airport (nominally 10-mile radius)
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69 Airport-based observations are the only source of routine observations of visibility available in the area, and the New Bedford airport station provides the best coverage for Buzzards Bay. Observations are made by the ferries operating from New Bedford to Cuttyhunk, Massachusetts, and from Woods Hole to Vineyard Haven, Massachusetts, but the measurements are episodic at best.
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70 hourly, and low-visibility events typically last only a few hours. Hence, for planning purposes the authors reduce the visibility-restricted days to 10 percent of those in the year for the 1-mile threshold and to 6.7 percent for the 0.5-mile threshold.
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71 FIGURE G-9 Mean visibility per day versus time for 2012 at New Bedford Regional Airport, from NOAA NCDC. (http://weatherspark.com/history/30212/2012/New-BedfordMassachusetts-United-States.)
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72 FIGURE G-10 Percentage of hourly observations with visibility below ¼ nautical mile (or 0.3 mile) from Hayes (2009)
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73 Low-visibility conditions (fog) and high winds do not occur at the same time, therefore the number of days with each of these conditions can be added together to determine a total frequency of hazardous weather conditions.
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