Reporter alleges discrepancy between ASOS ceiling reports and pilot reports. Reported values differed by as much as 800 ft. Discrepancies are becoming more frequent.

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Attributes
ACN	330868
Time
Date	199601
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl bound lower : 700 agl bound upper : 1500
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	tower : dfw tower : ath
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 22
ASRS Report	330868
Events
Anomaly	other anomaly other other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Air Traffic Incident	other
Situations
Navigational Aid	Unspecified

Narrative:

Several aircraft on final approach said the ceiling differed by 800 ft from what was reported on the ATIS. The ASOS was reporting a ceiling M15 overcast and aircraft were reporting the ceiling closer to 7 overcast. Different ceiling indications between the ASOS and pilot reports seem to be a frequent problem at dfw in the past couple of months.

Original NASA ASRS Text

Title: RPTR ALLEGES DISCREPANCY BTWN ASOS CEILING RPTS AND PLT RPTS. RPTED VALUES DIFFERED BY AS MUCH AS 800 FT. DISCREPANCIES ARE BECOMING MORE FREQUENT.

Narrative: SEVERAL ACFT ON FINAL APCH SAID THE CEILING DIFFERED BY 800 FT FROM WHAT WAS RPTED ON THE ATIS. THE ASOS WAS RPTING A CEILING M15 OVCST AND ACFT WERE RPTING THE CEILING CLOSER TO 7 OVCST. DIFFERENT CEILING INDICATIONS BTWN THE ASOS AND PLT RPTS SEEM TO BE A FREQUENT PROB AT DFW IN THE PAST COUPLE OF MONTHS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.