Atmospheric Gravity Wave Event

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Atmospheric Gravity Wave Event

• LT Brad G Harris

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Outline

• Ships observations.
• Other observations
• Comparison study

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Ship Data
Quick Obs 00-11Z Visibility at 20km. Sky
conditions unchanged. 12Z Visibility at
20km. Sky conditions unchanged. Quick squall.
Winds up to 25 knots in last hour
13Z Visibility decreased to 4km.
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NCEP 2004 FEB 02 12Z Surface Analysis
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Other Surface Observations
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Santa Cruz 1100
MBARI Mooring M1 1120
Chowchilla 1200
Fort Ord 1140
Granite Canyon 1130
MBARI Mooring M2 1100
Pt Sur 1130
Pt Piedras Blancas 1145
Paso Robles 1230
Wave Dir
Phase Speed 16m/s Wave Length 24km
Santa Maria 1200
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GOES-10 IR 1100Z
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GOES-10 IR 1200Z
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Comparison Study

• Looked at three articles involving comparison
  studies.

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Common Features

• Wave packets or less common singular wave
• Jet streak role not fully understood but gravity
  wave usually exist in exit region
• High precipitation rates
• Strong low level inversion below neutrally
  buoyant layer Inversion not present in this case
  but do have neutrally buoyant atmosphere.

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Questions?