WX 201 Final ERAU 2025-2026 most recent version Comprehensive 120 questions and verified answers accurate solutions Already graded A+ Get it 100% correct
•K Index (KI) - CORRECT ANSWER: -Larger KI indicates higher probability for
thunderstorm development (based on instability and water vapor in the environment)
•Lifted Index (LI) - CORRECT ANSWER: -Indicates how stable or unstable the
atmosphere is -The larger negative LI values indicate more instability
A low pressure system cyclone vs
A high pressure system or anticyclone - CORRECT ANSWER:
Advection Fog - CORRECT ANSWER: •Forms when warm, moist air rides over a cool
water or ground
•Common in coastal areas day or night
•Moderate wind speed (≤ 15 kt)
Airmass or single-cell thunderstorms - CORRECT ANSWER: •Consist of just one
thunderstorm cell
•Typically develop in warm, moist air masses far away from any fronts
- / 3
•They usually occur during the summer in weak vertical shear (0-2 kt/kft or 0-3 m/s per km)
•Propagate with the mean wind (averaged over the depth of the storm)
•They are typically short-lived (~30 min)
•Hazards: downbursts, lightning, small hail
Atmospheric charts locations - CORRECT ANSWER: Lows, highs, troughs, ridges,
fronts
bouyancy - CORRECT ANSWER: A vertical force related to the temperature difference between the parcel and ambient air
-Less dense than surrounding fluid --> positively buoyant --> accelerates upward
-More dense than surrounding fluid --> negatively buoyant --> accelerates downward
Celsius calculation - CORRECT ANSWER: C= 5/9 (F - 32)
Cloud nomenclature - CORRECT ANSWER: Nimbus=rain
cumulus=heaped stratus=layer alto=middle cirrus=high
•Low clouds (base < 6,500 ft AGL) 2 / 3
-Stratus (ST), stratocumulus (SC), nimbostratus (NS), cumulus (CU), cumulonimbus (CB)
•Middle cloud (base 6,500 -20,000 ft AGL) -Altocumulus (AC), altostratus (AS)
•High clouds (base > 20,000 ft AGL) -Cirrus (CI), cirrostratus (CS), cirrocumulus (CC)
cloud types - CORRECT ANSWER: -Cumuliform: Bumpy, heaped clouds (unstable air) although usually flat at the base
-Stratiform: Layered clouds (stable air)
Collision-coalescence - CORRECT ANSWER:
Conditions associated with Thunderstorms - CORRECT ANSWER: -Water vapor
-CCN (cloud condensation nuclei) -A cooling mechanism to bring the air to saturation
•Also contributing to development of deep convective clouds:
-Conditional instability -Triggering mechanism
convection - CORRECT ANSWER: Caused by buoyancy, a lifting force proportional to differences in air density
- / 3