Federal Meteorological Handbook No. 1 - Marrella

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9.5 Sky Cover Reporting Standards Table 9-1. Criteria for Variable Ceiling Ceiling (feet) Variation (feet) � 1,000 �200 >1,000 and �2,000 �400 >2,000 and
Table 9-3. Priority for Reporting Layers Priority Layer Description 1 lowest few layer. 2 lowest broken layer. 3 overcast layer. 4 lowest scattered layer. 5 second lowest scattered layer. 6 second lowest broken layer. 7 highest broken layer. 8 highest scattered layer. 9.5.3 Units of Measure for Heights. Heights of sky cover shall be evaluated in feet above the surface. 9.5.4 Reportable Values for Sky Cover Height. The reportable values of sky cover height are hundreds of feet. The reportable value increments are given in Table 9-4. Table 9-4. Increments of Reportable Values of Sky Cover Height Range of Height Values (feet) Reportable Increment (feet) �5,000 >5,000 but �10,000 To nearest 100 To nearest 500 >10,000 To nearest 1,000 9.5.5 Layer Heights. Heights of layers shall be reported in hundreds of feet, rounded to the nearest reportable increment. When a value falls halfway between two reportable increments, the lower value shall be reported. When a cloud layer is 50 feet or less above the surface, the height shall be reported as 000 (see paragraph 9.4.7.b). 9.5.6 Obscuration. When a portion of the celestial dome is obscured, the obscuration (amount of sky cover hidden by the weather phenomena) shall be reported (see paragraph 9.4.3 and Table 9-1). The obscuration shall also be reported as a remark (see paragraph 12.7.1.q). 9.5.7 Variable Ceiling. When the height of the ceiling layer is variable, and the ceiling layer is below 3,000 feet, a remark shall be included in the report giving the range of variability (see paragraphs 9.4.7.b and 12.7.1.p). 9.5.8 Ceiling Height at a Second Location. When automated stations use meteorological discontinuity ceilometer(s), remarks shall be added to identify ceiling height conditions at the second location which differ from the ceiling height in the body of the report (see paragraph 12.7.1.t). ��
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Federal Meteorological Handbook No. 1 - Marrella

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