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On Fri, 30 May 2008 09:39:00 -0700, Terence Wilson
wrote in : Here in the San Francisco Bay Area we've had coastal clouds in the mornings with ceilings in the 1000-2000 range recently, 10-20 miles west of Oakland the clouds dissipate completely. I was wondering weather there exists a reliable way of determining the cloud tops (other than PIREPs). TIA A little research yielded this information: http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/702ef0bfe021ab3986256bb2005c1458/$FILE/sec1-5.pdf In addition, pilots are a vital source of upper-air weather observations. In fact, aircraft in flight are the only means of directly observing turbulence, icing, and height of cloud tops. For more information on PIREPs, see Section 3. Recently some US and other international airlines have equipped their aircraft with instruments that automatically send weather observations via a satellite downlink. These are important observations which are used by NCEP in their production of forecasts. 1999 http://adds.aviationweather.noaa.gov/pireps/java/ PIREPs Java Tool http://aviationweather.gov/obs/radar/ Radar Coded Message Composite Image with Tops http://www.crh.noaa.gov/gjt/?n=tweb Transcribed Weather Broadcasts http://www.srh.noaa.gov/srh/cwwd/faqs/twb.htm TRANSCRIBED WEATHER BROADCAST ROUTE FORECAST To assist pilots in preflight and enroute planning. The forecast provides expected conditions (sky condition, cloud tops, surface visibility, weather and obstructions to visibility, and significant surface wind) along and 25 nautical miles either side of a specified route. TWEB route forecasts are disseminated via appropriate Federal Aviation Administration (FAA) communications systems,including low frequency navigational aids. CONTACT: Judson Ladd, W/SR1x2 Regional Aviation Meteorologist (817) 978-2652 Ext. 109 Inquire he http://www.weather.gov/tg/radarimage.html The NCEP/AWC composite image is produced which includes aviation used cloud tops, convective sigmets, and outlooks. |
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