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Forecasting Visibility

Forecasting Visibility

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Forecasting Visibility. ASOS Visibility Sensor. Uses Xenon flash light source and then measures how much light is scatttered into sensor. Rayleigh Scattering. Mie Scattering. Offshore Flow and Enhanced Visibility. Radiation Fog. Radiation Fog From Above. Advection Fog. Upslope Fog. - PowerPoint PPT Presentation

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Page 1: Forecasting Visibility

Forecasting Visibility

Page 2: Forecasting Visibility

ASOS Visibility Sensor

• Uses Xenon flash light source and then measures how much light is scatttered into sensor

Page 3: Forecasting Visibility

Mie Scattering

Rayleigh Scattering

Page 4: Forecasting Visibility

Offshore Flow and Enhanced Visibility

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Page 8: Forecasting Visibility

Radiation Fog

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Radiation Fog From Above

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Advection Fog

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Upslope Fog

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Upslope Fog: Snoqualmie Pass

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• 000 FXUS62 KGSP 131857 AFDGSP AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 253 PM EDT THU APR 13 2006 .SHORT TERM /TONIGHT THROUGH SATURDAY/... NORTHWESTERLY FLOW ALOFT WILL REMAIN OVER THE AREA THRU FRIDAY. …. THERE IS THE POSSIBILITY THAT KAND/KCLT COULD HAVE A BRIEF PERIOD OF MVFR FOG AROUND SUNRISE FRI GIVEN THE FORECAST HYDROLAPSE. HOWEVER CROSSOVER TEMPS ARE WELL BELOW FORECAST LOW TEMPS...THEREFORE WILL LEAVE OUT FOR NOW. CANNOT RULE OUT SOME VFR CEILINGS FROM TIME TO TIME...BUT CHANCE NOT HIGH ENOUGH TO INCLUDE AT THIS TIME. && .GSP WATCHES/WARNINGS/ADVISORIES... GA...NONE. NC...NONE. SC...NONE. && $$ SHORT TERM...RWH/CSH LONG TERM...CSH AVIATION...RWH

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