Tornado preparedness fundamentals — the complete US household reference for Tornado Alley and adjacent regions

Why this is the reference document

Most US tornado preparedness guidance is scattered across NWS pages, state emergency management documents, FEMA Safe Room standards, and Red Cross publications. This briefing consolidates the household-actionable subset.

If you live in the 12-state Tornado Alley region (Texas, Oklahoma, Kansas, Nebraska, South Dakota, Iowa, Missouri, Arkansas, Louisiana, Mississippi, Alabama, Tennessee) or adjacent regions, this is the briefing to bookmark.

The Enhanced Fujita (EF) Scale

Tornadoes are categorized 0-5 based on damage produced:

• EF0 (65-85 mph): Minor damage — tree branches, shingles, some siding
• EF1 (86-110 mph): Moderate damage — roof damage, mobile homes overturned
• EF2 (111-135 mph): Significant damage — roofs torn off, mobile homes destroyed
• EF3 (136-165 mph): Severe damage — substantial walls collapsed, vehicles thrown
• EF4 (166-200 mph): Devastating — homes leveled
• EF5 (200+ mph): Catastrophic — homes destroyed to foundation

Most US tornadoes are EF0-EF1 and pass over open ground. The fraction that reach EF3+ and intersect populated areas is what produces casualties.

Watch vs Warning — the critical distinction

The National Weather Service issues two tornado-related alerts. Most households conflate them.

### Tornado Watch - Conditions are favorable for tornado development in the watch area - Watch areas typically cover several counties to states - Duration: 4-6 hours typically - Response: be alert. Pre-stage your shelter. Continue normal activity but monitor weather.

### Tornado Warning - A tornado has been sighted by spotters OR detected on Doppler radar - Warning areas are specific to your county or part of county - Duration: 30-60 minutes typically - Response: shelter immediately. No exceptions.

Median lead time from Tornado Warning issuance to tornado touchdown: 14 minutes.

The 90-Second Shelter Rule

When a Tornado Warning is issued for your specific county:

You have approximately 90 seconds to be in shelter position.

Not "moving toward." In. Sheltering. Position assumed.

The 90 seconds is for: (1) finishing what you're doing to a safe stopping point, (2) grabbing what matters (a child, a pet, a medication), (3) descending stairs or moving to the shelter room.

If your household has not pre-identified the shelter location, those 90 seconds are spent debating, not sheltering. That debate is what produces casualties.

Shelter Location — Ranked by Safety

### Highest safety - Storm cellar (below-ground, away from house) — best option if available - FEMA P-361 saferoom in garage or basement — modern equivalent of storm cellar - Interior basement room away from windows, under heavy furniture

### Acceptable - Interior bathroom on lowest floor, no windows - Interior closet on lowest floor - Interior hallway on lowest floor away from windows

### Not Acceptable (despite popular belief) - Mobile home or manufactured home — provides essentially no tornado protection - Vehicle — driving away from tornado is rarely possible - Bridge underpasses — bridges actually concentrate wind, dangerous

### Mobile Home / Manufactured Home Protocol - Leave immediately when Warning issued - Drive to permanent structure within 2 minutes - If no permanent structure within 2 minutes, lie flat in low spot away from vehicles - Pre-identify the permanent structure now, not when storm is approaching

Vehicle Protocol

If caught in vehicle during Warning: - If you can see the tornado track AND have clear road away from it: drive away at right angles to track - Otherwise: abandon vehicle, find low spot, cover head - Do NOT shelter under overpasses or in vehicles

Pre-Position These Items in Your Shelter Location

The shelter location is where you spend the next 5-30 minutes during a tornado. Pre-stage:

• Sturdy shoes for everyone (walking through debris afterward)
• Helmets or padded coverings for heads (bicycle helmets work)
• Flashlights with batteries (power often out after storm)
• Phones charged (communication)
• Water bottles (especially if duration extends)
• NOAA Weather Radio if you have one
• First aid kit (basic injuries common during storms)
• Important documents (deeds, insurance, IDs — in waterproof container)

Tornado Warning Communication Systems

### Primary - Wireless Emergency Alerts (WEA) — automatic on most phones - NOAA Weather Radio — battery-operated, programmable by county - Outdoor warning sirens — only audible outside

### Secondary - Local TV stations — most break into programming during warnings - Weather radar apps (RadarScope, Weather Underground) - Emergency Alert System via TV/radio

### Tertiary - Family group chat — useful if family members are in different locations - Out-of-area family contact — relative in different region acts as information hub

For most US households: WEA + NOAA Weather Radio is sufficient. NOAA Weather Radio at $25-50 is the single best $50 a Tornado Alley household can spend.

Family Communication Plan

Before tornado season:

• Designate the shelter location for every member of the household
• Designate the family meeting place if separated (typically at home or designated alternate)
• Designate the out-of-area contact (relative in different region everyone calls)
• Practice the 90-second walk to shelter — children handle better when familiar

During Tornado

In shelter: - Stay until "all clear" from NWS or local emergency management - Cover head and neck with hands or padding - Stay away from windows even in shelter location - Watch for water seeping under doors (flooding from associated heavy rain) - Listen for sounds of structure damage

After Tornado

• Stay sheltered until verified all clear
• Beware power lines, gas leaks, structural damage
• Document damage with photos
• Help neighbors if safe to do so
• Boil water until municipal water supply confirmed safe
• Watch for follow-on tornadoes during same severe weather event

What this is not

This is not a guarantee of safety. The vast majority of Tornado Alley households experience tornado warnings without direct hits. The point of this reference is that the household with assigned shelter positions and pre-staged supplies handles a warning as inconvenience, while the household without these handles it with chaos.

The single most-leveraged action is buying a NOAA Weather Radio. $30-50. Tune to your county code. Done. Single most-effective preparedness purchase for Tornado Alley households.

One thing this week: if you don't have a NOAA Weather Radio, buy one this Saturday. Most hardware stores and Amazon. Set to your county code. Verify it alerts properly. 15-minute setup.

— Systems Fail Lab