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What dose the scalloped lines on the low level prognostic chart mean ?
1) Where thunderstorms are expected to develope
2) with ceilings below 1000 feet and / visibility below three miles
3) with ceiling from 1000to 3000 ft and / or visibility from 3 to 5 miles

2006-11-27 10:34:42 · 5 answers · asked by Michael 1 in Cars & Transportation Aircraft

5 answers

go to:http://aviationweather.gov/data/products/swl/ll_00_4_cl_new.gif


look at the center of the 4-panel Low Level SIGWX Chart, it gives you your answere there.

also take a look at AC 00-45E "Aviation Weather Services ". That can be found at:
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/702EF0BFE021AB3986256BB2005C1458?OpenDocument
look at 11-1. whaich says in part:

"Cumulonimbus clouds (CBs) are thunderstorm clouds. Areas of CBs meeting select criteria are enclosed
by scalloped lines. The criteria are widespread CBs within an area or along a line with little or no space
between individual clouds, and CBs are embedded in cloud layers or concealed by haze or dust. The
prog does not display isolated or scattered CBs (one-half or less coverage) which are not embedded in
clouds, haze, or dust. Cumulonimbus areas are identified with "CB" and characterized by coverage and
tops. Coverages are identified as isolated (ISOL), occasional (OCNL), and frequent (FRQ). Isolated and
occasional CBs are further characterized as embedded (EMBD.) Coverage values for the identifiers are:
isolated - less than 1/8; occasional - 1/8 to 4/8; and frequent - more than 4/8. Tops are identified in
hundreds of feet using the standard top and base format. Bases extend below 24,000 feet (below the
prog's forecast layer) and are encoded "XXX." The identification and characterization of each
cumulonimbus area will appear within or adjacent to the outlined area. Thunderstorms always imply a
variety of aviation hazards including moderate or greater turbulence and hail."

2006-11-27 15:03:09 · answer #1 · answered by cherokeeflyer 6 · 0 0

Prognostic Chart

2016-11-09 23:13:13 · answer #2 · answered by ? 4 · 0 0

3.Ceiling 1000'-3000' inclusive and/or visibility 3-5 miles inclusive.

2006-11-27 15:02:53 · answer #3 · answered by syedg1 1 · 0 0

the center of the chart should have a legend that defines all the lines on the chart. Look there and you'll have your answer.

2006-11-28 04:59:20 · answer #4 · answered by Jason 5 · 0 0

The answers to these questions are on the chart itself if you look at the FAA private/instrument or commercial test booklet.

2006-11-27 11:37:05 · answer #5 · answered by barrych209 5 · 0 1

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