Missouri outages are shaped by repeated severe-storm and flash-flood events, with winter support becoming important when disruptions stretch beyond the first day.
Missouri sits in a central storm corridor where severe storms, flash floods, and winter events all matter, especially in counties like Greene, Jackson, St. Louis, and Jasper.
Central Storm Corridor with Winter Fallback
Missouri's outage rhythm is broader than a winter-first description. NOAA's outage-relevant record is dominated by thunderstorm wind, flash flood, flood, and winter storm events, which makes Missouri a central mixed-hazard state rather than a cold-snap pattern with incidental weather around it. The winter constraint is real, but it is not the whole picture.
The county overlap is also strong enough to give Missouri a concrete metro spine. HHS emPOWER counts 69,045 electricity-dependent Medicare beneficiaries statewide, and the public BPI layer flags Greene, Jackson, St. Louis, and Jasper. That means Missouri backup planning should start with essential loads and medical continuity through repeated storms, then add winter-support logic where the home heating system needs it.
FEMA DR-4741 covers Missouri severe storms, straight-line winds, tornadoes, and flooding from July 2023.
Source: FEMA DR-4741Evidence trail
These notes trace the editorial claims above back to FEMA, DOE, utility, or other cited records.
FEMA declaration count (14) from OpenFEMA API, deduplicated by disaster number, DR/EM/FM types, 2014-2023.
NRI composite score (80.1) from FEMA NRI county layer, population-weighted to state level; top modeled hazards are Heat Wave, Tornado, and Cold Wave.
NOAA outage-relevant event mix is led by Thunderstorm Wind (10,945), Flash Flood (4,538), Flood (2,926), and Winter Storm (1,680), with Greene, Douglas, and Jackson leading county counts.
HHS emPOWER counts 69,045 electricity-dependent Medicare beneficiaries statewide; Greene, Jackson, St. Louis, and Jasper qualify in the public BPI layer.
Missouri Severe Storms, Straight-Line Winds, Tornadoes, and Flooding DR-4741 from FEMA disaster declaration records.
Structured FEMA NRI, HHS emPOWER, NOAA Storm Events, and EIA methodology is documented separately on the methodology page.
NRI's top modeled hazards are Heat Wave, Tornado, and Cold Wave, while NOAA's outage-relevant record is led by Thunderstorm Wind, Flash Flood, Flood, and Winter Storm events..
NOAA storm-event records filtered to outage-relevant event types for Missouri. Counts reflect historical storm-event assignments, not confirmed utility outages.
Analysis window
2005-01 to 2024-12
Included storm-event records
23,552
Source as of
2026-03
Included exact NOAA event types for Missouri: Thunderstorm Wind, Tornado, High Wind, Strong Wind, Flash Flood, Flood, Winter Storm, Ice Storm, Freezing Rain, Heavy Snow, Blizzard.
In this filtered NOAA record set for Missouri, Jun has the highest monthly count (3,548 records) , and Thunderstorm Wind is the leading event type. This chart shows frequency in NOAA records, not how severe a specific outage may be.
95.6% of listed records were matched directly to this county.
94.7% of listed records were matched directly to this county.
91.2% of listed records were matched directly to this county.
92.6% of listed records were matched directly to this county.
92.6% of listed records were matched directly to this county.
94.1% of listed records were matched directly to this county.
With the current Missouri NWS county crosswalk, mapped forecast zones are effectively 1:1 with counties, and no unresolved forecast zones were present in this state contract.
Direct county match
82.7%
Mapped from forecast zone
17.3%
Not assigned to county ranking
0.0%
Unresolved forecast zones
0
County-level HHS emPOWER counts for electricity-dependent Medicare beneficiaries in Missouri.
69,045 Medicare beneficiaries in Missouri have claims associated with electricity-dependent medical equipment. (HHS emPOWER, 2026-03)
County-level HHS emPOWER records for this state. Medicare enrollment data only. 115 counties are included in this state snapshot.
Smaller Medicare base; interpret this percentage with extra caution.
Counties with higher concentrations may face elevated community-level demand for backup power during outages. This does not indicate individual medical necessity.
Limitations: Reflects Medicare beneficiaries with claims associated with electricity-dependent medical equipment. Does not capture non-Medicare or uninsured populations. HHS masks cells from 1 to 10 as 11.
The GeneratorChecker Backup Priority Index is a county shortlist for backup planning, combining historically frequent outage-relevant storm activity with larger county counts of electricity-dependent Medicare beneficiaries. It is planning context, not a forecast or an outage guarantee.
BPI version
v1.0
Analysis window
2005-01 to 2024-12
Matched counties
115
Counties qualify for the public BPI only when both signals land at or above the 80th percentile within the state. The shortlist excludes low-base medical counties and counties with less than 30% direct NOAA county matching.
Qualifying counties shown on the page: 5.
Percentiles are computed within Missouri only and are not comparable across states.
1. GREENE
County FIPS 29077
At-risk Medicare count
3,514
Storm-event records
948
Direct NOAA county match
95.6%
2. JACKSON
County FIPS 29095
At-risk Medicare count
6,046
Storm-event records
533
Direct NOAA county match
91.2%
3. ST. LOUIS
County FIPS 29189
At-risk Medicare count
6,619
Storm-event records
432
Direct NOAA county match
92.6%
4. JASPER
County FIPS 29097
At-risk Medicare count
2,117
Storm-event records
459
Direct NOAA county match
92.6%
5. CLAY
County FIPS 29047
At-risk Medicare count
2,239
Storm-event records
319
Direct NOAA county match
87.5%
Start with mixed-event essentials, then add winter support if your heating system depends on blower power.
Refrigeration, communications, and medical continuity for the shorter severe-storm and flash-flood outages common in Missouri.
Load
338W
Target
24h
Minimum
13,400 Wh
This is the more general Missouri case for repeated severe-storm and flood outages.
Size this scenario in calculatorAdd heating-system support for households whose fuel-fired heat still depends on blower power during a longer cold-weather outage.
Load
1396W
Target
48h
Minimum
110,100 Wh
This assumes a fuel-fired furnace or boiler still needs blower power. Homes with electric heat should model a different heating profile.
Size this scenario in calculatorCritical Note: No single portable power station in our database covers the full 24-hour baseline at this load (13,400 Wh target vs. 6,144 Wh max in our current database). Use solar recharge, load rotation, or expandable systems for longer events.
Treating Missouri like a pure winter state when flash floods and severe storms drive many of the longest practical outages.
Letting the top modeled heat score become the whole picture when the outage record is more storm-driven.
Ignoring metro medical-load counties while sizing only for convenience loads.
For home backup, you need surge capacity for fridge compressors and enough Wh for multi-day outages. Here are the best options from our database of 33 stations.
A 1,500W space heater drains a power station in 1-2 hours. Here's the honest math on battery-powered heating, plus smarter alternatives that actually work.
From CPAP to oxygen concentrators, here is a practical checklist for keeping medical equipment running during power outages. Includes sizing math and emergency contacts.
Composite score: 80.1 / 100
Rating: Relatively High
Top modeled hazards: Heat Wave, Tornado, Cold Wave
Hurricane score: 25.1
Winter Weather score: 79.3
Wildfire score: 53.8
Total (2014-2023): 14
Most recent: 2023-09-21 Severe Storm
| Type | Count |
|---|---|
| Severe Storm | 7 |
| Flood | 5 |
| Biological | 2 |
Required Wh = (Total Load W × Target Hours / Inverter Derate) × Safety Factor
Inverter derate: 0.70 (30% real-world loss)
Safety factor: 1.15
Rounding: Up to nearest 100 Wh
Missouri has an NRI composite risk score of 80.1 (Relatively High), with 14 federal declarations from 2014 to 2023. NRI's top modeled hazards are Heat Wave, Tornado, and Cold Wave, while NOAA's outage-relevant record is led by Thunderstorm Wind, Flash Flood, Flood, and Winter Storm events..
For the primary scenario on this page (24-hour storm essentials), the estimated minimum is 13,400 Wh for a 24-hour target. Refine this in the calculator with your actual devices.
NRI is a modeled risk index based on hazard exposure, vulnerability, and expected loss. FEMA declarations reflect federally declared incidents. They answer different questions — use both signals together for planning.
Planning around one weather season and missing the storm-and-flood events that repeatedly stress Missouri households. See the common mistakes section above for more state-specific pitfalls.
