The approximate distance to a storm center can be determined by noting the hourly rate of fall of the barometer. If the rate of fall is 0.08 - 0.12 inches, what is the approximate distance to the storm center?
• Relationship between barometric pressure fall rate and storm proximity • Typical pressure fall ranges used in storm-distance estimation tables • Assumption that faster pressure drop = closer storm center
• How would the distance to a storm center change as the barometer falls more quickly each hour? • Compare 0.08 - 0.12 inches per hour with a much smaller fall (for example, 0.02 inches per hour). Would 0.08 - 0.12 indicate a relatively near or distant storm? • Think about rough groupings: which answer choices would you associate with a slow, moderate, or rapid pressure fall?
• Be sure you understand that a larger rate of fall means the storm is closer, not farther away. • Mentally rank the answer choices from closest to farthest distance and match that to how strong you think a 0.08 - 0.12 inch/hour fall is. • Confirm that you are using the idea of an approximate rule-of-thumb table, not exact meteorological calculations.
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