Tornado vs Microburst

Key Difference: Rotation

Tornado

Rotating column of air. Wind rotates around center.

Microburst

Descending column of air. Wind spreads outward from center. No rotation.

Damage Pattern

Tornado Damage

Damage is:

• Rotational pattern
• Debris scattered in circular pattern
• Trees fall in different directions
• Ground scarring where possible
• Path-based linear damage corridor

Microburst Damage

Damage is:

• Straight-line pattern
• All debris blown one direction
• All trees fall same direction
• Radial damage from strike point
• Star or fan-shaped pattern

Formation

Tornado Formation

• Requires supercell thunderstorm
• Mesocyclone rotation
• Vertical development
• Can last 10-60+ minutes
• Movement across landscape

Microburst Formation

• Rapid downdraft from thunderstorm
• Cold, dense air descends
• Spreads on ground
• Lasts 5-20 minutes
• Localized event

Types of Microbursts

Wet Microburst

Rain-cooled downdraft:

• Associated with thunderstorm
• Common in high-humidity environments
• Preceded by heavy rain
• Visible in radar

Dry Microburst

Dry air downdraft:

• Common in Southwest US
• Little rain reaches ground
• Dry environment
• Visible dust column

Wind Speeds

Tornado Wind Speed

• EF0-EF1: 65-110 mph
• EF2-EF3: 111-165 mph
• EF4-EF5: 166-300+ mph

Microburst Wind Speed

• Typical: 60-100 mph
• Strong: 100-150 mph
• Extreme: 150+ mph

Aviation Danger

Microburst Aviation Threat

Microbursts are extreme aviation hazards:

• Sudden wind shear
• Difficult to detect visually
• Historically caused several airline crashes
• Modern radar detection improved

Tornado Aviation Threat

Tornadoes are visible and localized:

• Pilots avoid tornado-producing storms
• Aviation warnings for storm areas
• Radar detection excellent

Safety Response

Tornado Safety

Interior shelter:

• Basement or interior room
• Lowest floor
• Away from windows
• Cover head
• Wait for all-clear

Microburst Safety

Similar but shorter response:

• Get inside immediately
• Away from windows
• Avoid trees and outdoor structures
• Brief event (5-20 min)
• Wait for storm to pass

Detection

Tornado Detection

• Radar velocity signatures
• Visual observation
• Storm spotters
• Debris signatures
• Warning polygons

Microburst Detection

• Terminal Doppler Weather Radar
• Radar reflectivity patterns
• Wind sensor networks (at airports)
• Visual dust columns
• Sudden wind shifts

How to Tell the Difference

After the Event

Damage assessment reveals the source:

• Rotational damage = tornado
• Straight-line damage = microburst
• Fan-shaped from center = microburst
• Linear corridor = tornado

During the Event

Difficult to distinguish in real-time:

• Both dangerous
• Both require immediate shelter
• Both associated with thunderstorms
• Safety response similar

Frequency

US Frequency

• Tornadoes: ~1,200/year
• Microbursts: ~10,000+/year (higher counts)
• Different distribution patterns
• Different warning approaches

Bottom Line

Tornadoes rotate; microbursts don't. Damage patterns differ - tornadoes create rotational damage patterns, microbursts create radial fan-shaped patterns. Safety response for both is similar (interior shelter). Both are dangerous. Both need immediate response. Understanding the difference helps identify what struck after damage assessment.