Weather for the Mariner

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Pressure• Barometers are instrumentsthat measure air pressure.• Barometric pressure is oneof the best indicators ofimpending weather• Barometric pressure shouldbe logged hourly!
Pressure• Atmospheric pressure ismeasured either:Outer scale on dialreads millibars– Millibars (preferred)• Outside scale of barometer• NOAA weather charts– Inches of mercury• Inside scale of barometerInner scale on dialReads inches of Hg
Page 1: Weather for the MarinerCDR Donna Se
Page 4 and 5: Decisions Affected by Weather:Crew
Page 6 and 7: Decisions Affected by Weather:Navig
Page 8 and 9: Weather Tools Available On• Barom
Page 10 and 11: Weather Tools Onboard Navy 44• Ch
Page 12 and 13: Typical chart receivedonboard a Nav
Page 15 and 16: Nautical Weather Sayings• Red sky
Page 17 and 18: Marine Weather Thumb Rules• Pay a
Page 19 and 20: Marine Weather Thumb Rules• Low a
Page 21 and 22: Marine Weather Thumb Rules• Chang
Page 23 and 24: Air Masses• Air masses are vast b
Page 25 and 26: Can you pick out the5 types of air
Page 27 and 28: Pressure• The Earth is alwaysthro
Page 29: High Pressure• Air circulates aro
Page 33 and 34: Pressure and P`essure Trends• Wat
Page 35 and 36: Wind and Pressure• Wind is the re
Page 37 and 38: Wind and Pressure• Weather charts
Page 39 and 40: The red arrow indicates your boat
Page 41 and 42: Air Masses and Frontal Systems• W
Page 43 and 44: Cold Front• Cold Air pushes under
Page 45 and 46: Cold Front Weather Sequence• Wind
Page 47 and 48: Cold Front Weather Sequence• As f
Page 49 and 50: 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 102 and 103:
Deciphering Wind Barbs• Wind barb
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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