Weather for the Mariner

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Deciphering Wind Barbs• Wind barbs are found on sfc analysis chartsand give in<strong>for</strong>mation regarding– cloud cover– wind direction– wind speed– Barometric pressure– Air temperature– Dew point
Deciphering Wind Barbs(each long barb 10 kts; short barb 5kts)Wind is from NE in this exampleWind direction and speedAir temp Barometric pressureCloud coverDew pointCloud typeFor Barometric Pressure:0153 means 1015.3 mb803 means 980.3 mb(place a 1 or 9 in front of firstdigit, whatever makes <strong>the</strong>number closest to 1000
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Weather for the MarinerCDR Donna Se
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Decisions Affected by Weather:Crew
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Decisions Affected by Weather:Navig
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Weather Tools Available On• Barom
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Weather Tools Onboard Navy 44• Ch
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Typical chart receivedonboard a Nav
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Nautical Weather Sayings• Red sky
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Marine Weather Thumb Rules• Pay a
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Marine Weather Thumb Rules• Low a
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Marine Weather Thumb Rules• Chang
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Air Masses• Air masses are vast b
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Can you pick out the5 types of air
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Pressure• The Earth is alwaysthro
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High Pressure• Air circulates aro
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Pressure• Atmospheric pressure is
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Pressure and P`essure Trends• Wat
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Wind and Pressure• Wind is the re
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Wind and Pressure• Weather charts
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The red arrow indicates your boat
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Air Masses and Frontal Systems• W
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Cold Front• Cold Air pushes under
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Cold Front Weather Sequence• Wind
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Cold Front Weather Sequence• As f
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Microburst Sequence
Page 51 and 52: Warm Front Weather• Cirrus clouds
Page 53 and 54: Nimbostratus (Ns)Altostratus (As)Ci
Page 55: Occluded Front• Occurs when cold
Page 58 and 59: Typical chart receivedonboard a Nav
Page 60 and 61: Nautical Weather Sayings• Red sky
Page 62 and 63: Forecasting weather usingclouds•
Page 64 and 65: CloudsAltocumulus Ac(mackerel skies
Page 66 and 67: Cloudscumulus Cu (heap)
Page 68 and 69: CloudsCumulonimbus Cb
Page 70 and 71: CloudsCumulonimbus with waterspout
Page 72 and 73: Red Sky at NightSailor’s Delight
Page 74 and 75: “Mackerel Skies and Mare’s Tail
Page 76 and 77: USN Official Use Only ResourcesNava
Page 78 and 79: Location of NOAA Buoys
Page 80 and 81: Location of NOAA Buoys
Page 82: Location of NOAA Buoys
Page 86 and 87: SSB or HF Radio• Voice Broadcasts
Page 88 and 89: Wind WarningsGale Warnings: 34 - 47
Page 90 and 91: Hurricane Warnings• Definite Clos
Page 92 and 93: Hurricanes and Tropical Storms• A
Page 94 and 95: Onboard Weather ChartsHF Facsimile
Page 96 and 97: Weather Charts• Weather Charts ca
Page 98 and 99: Weather Chart Symbols
Page 100 and 101: Weather Charts and Symbols• Surfa
Page 104 and 105: Deciphering Wind BarbsWhat is the d
Page 106: Weather Chart Symbols
Page 109: Surface Forecast Charts for 24 hr 4
Page 112 and 113: Remember what the bold 564 isoheigh
Page 114 and 115: Upper Level Weather Charts• Upper
Page 116 and 117: 5640 isoheight (bold line) shows th
Page 118: Why is Sea State Important?• Beca
Page 123 and 124: Remember what the bold 564 isoheigh
Page 125: Questions???
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