🔍 Key Concepts

• standard sea-level pressure vs low pressure values (inches of mercury) • difference between a single barometer reading and a pressure trend (rising/falling) • general relationship between low pressure and weather conditions

💭 Think About

• Ask yourself what information you can and cannot get from just ONE barometric reading. Can you tell if weather is improving or deteriorating from a single snapshot? • Compare 28.60 to normal sea-level pressure (about 29.92 inHg). Is 28.60 relatively high, normal, or very low? What kind of systems are associated with that level? • Which answer choices describe a trend over time, and which describe the type of system currently present?

✅ Before You Answer

• Identify which options (if any) require knowing whether pressure is rising or falling over time—can a single reading give you that? • Decide whether 28.60 is closer to normal/fair-weather pressure or to a deep low value. • Eliminate any choices that contradict what you know about low pressure and stormy vs fair weather.