General Studies 2024 GS Paper I 15 marks 250 words Compulsory Explain

Q16

What is a twister? Why are the majority of twisters observed in areas around the Gulf of Mexico? (Answer in 250 words) 15

हिंदी में प्रश्न पढ़ें

ट्विस्टर क्या है? मैक्सिको की खाड़ी के आसपास के क्षेत्रों में अधिकतर ट्विस्टर क्यों देखे जाते हैं? (उत्तर 250 शब्दों में दीजिए)

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Directive word: Explain

This question asks you to explain. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'explain' requires a clear definition of 'twister' followed by causal reasoning for Gulf of Mexico concentration. Structure: brief definition (40 words) → meteorological explanation with 3-4 causal factors (150 words) → concluding with significance/climate change link (60 words).

Key points expected

Definition: Twister is a colloquial term for tornado—a violently rotating column of air extending from cumulonimbus cloud to ground, measured by Fujita/Enhanced Fujita scale
Gulf of Mexico as warm water source: Sea Surface Temperatures (SST) >26°C fuel moisture-laden maritime tropical (mT) air masses
Dixie Alley/Tornado Alley geography: Flat terrain allows unobstructed warm air inflow; cold dry polar air from Canada clashes with warm Gulf air
Jet stream dynamics: Strong wind shear (vertical/horizontal) creates mesocyclone rotation in supercell thunderstorms
Seasonality: Spring peak (March-May) when temperature gradients are steepest; mention of recent eastward shift in tornado frequency
Comparative context: Contrast with India's tornado-prone regions (e.g., Bengal tornadoes 1963, 1978) or absence of comparable frequency due to Himalayan barrier and different air mass interactions

Evaluation rubric

Dimension	Weight	Max marks	Excellent	Average	Poor
Demand-directive understanding	20%	3	Clearly distinguishes 'twister' as tornado (not generic cyclone/hurricane); addresses BOTH parts—definition AND Gulf-specific causation; maintains explanatory tone throughout without drifting into description	Defines twister adequately but conflates with hurricanes/cyclones; answers both parts superficially or gives uneven weightage; partially explanatory with some descriptive drift	Misidentifies twister as waterspout/hurricane/any rotating storm; ignores second part on Gulf of Mexico; purely descriptive with no causal explanation
Content depth & accuracy	20%	3	Precise meteorological terms: supercell, mesocyclone, wind shear, mT air mass, CAPE (Convective Available Potential Energy); accurate SST thresholds; correct geographic extent (Dixie Alley, Tornado Alley)	Basic meteorology correct but vague on mechanisms; mentions warm air and cold air clash without specifying air mass types; minor geographic inaccuracies	Scientifically inaccurate (e.g., Coriolis effect as primary tornado cause, or eye of tornado); confuses tornado formation with cyclogenesis; major geographic errors
Structure & flow	20%	3	Logical progression: definition → formation conditions → Gulf-specific factors (thermal, topographical, dynamic) → significance; smooth transitions; balanced 40:150:60 word distribution; adheres to 250-word limit precisely	Recognizable structure but uneven sections; some repetition between definition and explanation; word count slightly off (200 or 280+); transitions present but mechanical	Disorganized or fragmented; no clear separation between definition and explanation; severely under/over word limit; bullet points without integration
Examples / case-law / data	20%	3	Specific data: Oklahoma 2013 Moore tornado (EF5), 2023 Rolling Fork tornado; tornado frequency statistics (~1,200/year US, 80% in Tornado Alley); comparative mention of India's limited tornado occurrence (West Bengal, Assam) or Bangladesh	Generic reference to 'US Midwest' or 'Texas'; mentions tornado alley without specificity; no comparative Indian context or dated/vague examples	No examples or data; irrelevant examples (hurricanes Katrina/Ian, Pacific typhoons); fabricated statistics
Conclusion & analytical edge	20%	3	Analytical closure: climate change impact on tornado season shift (eastward migration to Dixie Alley), urbanization vulnerability, or early warning systems (NEXRAD radar); connects to disaster management relevance for India	Summary restatement without new insight; generic statement on disaster preparedness; weak or abrupt ending	No conclusion; ends mid-explanation; irrelevant conclusion on unrelated topics (cyclone mitigation, general climate change)

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