ASOS 30-Second Ceilometer Data (DSI-6404)
Entry ID:
gov.noaa.ncdc.C00420
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Summary
Abstract:
ASOS 30-Second Ceilometer Data is digital data set DSI-6404, archived at the National Climatic Data Center (NCDC). A major part of the National Weather Service (NWS) modernization effort in the 1990s is the implementation of the Automated Surface Observing System (ASOS). The ASOS Cloud Height Indicator (CHI) is a laser ceilometer that features a rapid pulse and sampling rate. The pulse rate varies ... from 620 Hz to 1,120 Hz according to ambient air temperature. At a nominal pulse rate of 770 Hz, the ceilometer outputs 9,240 pulses during a 12-second sampling period. The vertical resolution is 50 feet up to 12,600 feet above ground level (AGL). The maximum reporting height is 12,000 ft. The ceilometer data are sampled by the ASOS software once every 30 seconds. The accumulated 30-second data are arranged by height and averaged over a time-weighted 30-minute period to determine up to three cloud layers for each observation. Because ceilometer data is high-resolution and high-volume, at present only 25 ASOS sites contribute data, out of hundreds that currently exist. All are in the 48 contiguous United States of America. The earliest data is from June, 1998. Meteorological parameters include how many cloud layer bases, if any, were detected, and the height and thickness of each cloud layer. Other parameters include ceilometer status information and quality control parameters. This 30-second Ceilometer data set contains the 30-second samples and sensor status information for twenty-five ASOS reference sites below: Station and Call Sign Astoria, OR AST Atlanta, GA ATL Atlantic City, NJ ACY Brownsville, TX BRO Bismarck, ND BIS Charleston, SC CHS Dallas-Ft. Worth, TX DFW Denver, CO DEN Grand Rapids, MI GRR Great Falls, MT GTF Lincoln, NE LNK Los Angeles, CA LAX Minneapolis-St. Paul, MN MSP Mobile, AL MOB Paducah, KY PAH Pittsburgh, PA PIT Portland, ME PWM Raleigh-Durham, NC RDU Salt Lake City, UT SLC San Francisco, CA SFO Sault Ste. Marie, MI CUI Syracuse, NY SYR Tucson, AZ TUS Tulsa, OK TUL West Palm Beach, FL PBI 
Purpose:
To make a wide range of climatic data available to researchers and the public.
SUPPLEMENTAL INFORMATION: data set
CURRENTNESS REFERENCE: Ground Condition
Related URL
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Description:
View Source Metadata document from the Metadata Manager and Repository (NMMR).
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 50.0
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S: 24.0
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E: -65.0
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W: -125.0
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Data Set Citation
Dataset Originator/Creator:
National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Dataset Title:
ASOS 30-Second Ceilometer Data (DSI-6404)
Dataset Release Date:
Unknown
Data Presentation Form:
tabular digital data
Online Resource:
http://www.ncdc.noaa.gov
Data Resolution
Temporal Resolution:
30 Seconds
Temporal Resolution Range:
1 second - < 1 minute
Quality
ATTRIBUTE ACCURACY REPORT: Not provided
LOGICAL CONSISTENCY REPORT: Unknown
COMPLETENESS REPORT: Completeness information not available.
LINEAGE/PROCESS STEP:
PROCESS DESCRIPTION: Unknown
PROCESS DATE: Unknown
Access Constraints
ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use Constraints
None
Data Set Progress
IN WORK
Personnel
Role:
DIF AUTHOR
Phone:
828-271-4800
Fax:
828-271-4876
Email:
ncdc.orders at noaa.gov
Contact Address:
151 Patton Avenue, Room 120
City:
Asheville
Province or State:
NC
Postal Code:
28801-5001
Country:
USA
Creation and Review Dates
DIF Creation Date:
2006-06-27
Last DIF Revision Date:
2011-07-21
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