What significant sky condition is reported in this METAR observation?

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METAR KBNA 1250Z 33018KT 290V360 1/2SM R31/2700FT +SN BLSNFG VV008 00/M03 A2991 RMK RAE42SNB42

On what frequency should you obtain En Route Flight Advisory Service below FL 180?

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The Low-Level Significant Weather Prognostic Chart depicts weather conditions

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(Refer to figure 9.) The Severe Weather Outlook Chart, which is used primarily for advance planning, provides what information?

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