Weather for the Mariner

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Upper Level Weather Charts• Upper Level Charts are good forecasting tools because they show thegeneral upper level flow which is unimpeded by surface friction.• 500 mb chart available via weather fax. It shows the isoheightcontours (meters) of 500mb pressure.• The “bold” 5640 meter isoheight shows the southern extent of:– the Beaufort Force 7 seas (13.5-19 ft) and winds (28-33 kts) inwinter– the Beaufort Force 6 seas (5-13 ft) and winds (22-27 kts) insummer.
5640 isoheight (bold line) shows the southward extent of the:Force 7 seas (13.5-19 ft) and winds (28-33kts) -- in winterForce 6 seas (5-13 ft) and winds (22-27kts) -- in summer
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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
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Warm Front Weather• Cirrus clouds
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Nimbostratus (Ns)Altostratus (As)Ci
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Occluded Front• Occurs when cold
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Typical chart receivedonboard a Nav
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Nautical Weather Sayings• Red sky
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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 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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Weather for the Mariner

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