South Dakota outages are a Plains wind-and-winter problem first, with long distances and snow recovery mattering more than a generic cold-weather description.
South Dakota backup planning should treat this as a Plains continuity problem: high wind, winter storms, and long restoration distances can stretch essentials well past the first day.
Plains Winter and High-Wind Continuity
South Dakota's practical outage risk is more Plains-specific than a generic Upper Midwest winter assumption would suggest. NOAA's outage-relevant record is led by thunderstorm wind, high wind, flood, and winter storm events, while the broader planning problem is continuity across distance, snow, and cleanup rather than just a single overnight cold snap.
The county overlap also spans both the western and eastern parts of the state. HHS emPOWER counts 10,695 electricity-dependent Medicare beneficiaries statewide, and the public BPI layer is led by Pennington, Meade, Minnehaha, and Brown. That points to refrigeration, communications, medical continuity, and winter support through a longer Plains disruption.
FEMA DR-4689 covers South Dakota severe winter storms and snowstorm impacts from December 2022, within the 2014-2023 federal record.
Source: FEMA DR-4689Evidence trail
These notes trace the editorial claims above back to FEMA, DOE, utility, or other cited records.
FEMA declaration count (24) from OpenFEMA API, deduplicated by disaster number, DR/EM/FM types, 2014-2023; South Dakota's mix in this window includes Severe Storm (8), Flood (4), Winter Storm (3), and Fire (4).
NRI composite score (56.6) from FEMA NRI county layer, population-weighted to state level; top modeled hazards are Winter Weather, Hail, and Wildfire.
NOAA outage-relevant event mix is led by Thunderstorm Wind (7,831), High Wind (3,208), Flood (2,204), and Winter Storm (1,938), with Pennington, Meade, Custer, and Brown leading county counts.
HHS emPOWER counts 10,695 electricity-dependent Medicare beneficiaries statewide; Pennington, Meade, Minnehaha, Brown, and Custer are the strongest county anchors in the public BPI layer.
South Dakota Severe Winter Storms and Snowstorm DR-4689 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 Winter Weather, Hail, and Wildfire, while NOAA's outage-relevant record is led by Thunderstorm Wind, High Wind, Flood, and Winter Storm events..
NOAA storm-event records filtered to outage-relevant event types for South Dakota. Counts reflect historical storm-event assignments, not confirmed utility outages.
Analysis window
2005-01 to 2024-12
Included storm-event records
19,404
Source as of
2026-03
Included exact NOAA event types for South Dakota: 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 South Dakota, Jun has the highest monthly count (3,310 records) , and Thunderstorm Wind is the leading event type. This chart shows frequency in NOAA records, not how severe a specific outage may be.
44.1% of listed records were matched directly to this county.
43.1% of listed records were matched directly to this county.
37.0% of listed records were matched directly to this county.
74.8% of listed records were matched directly to this county.
81.7% of listed records were matched directly to this county.
59.4% of listed records were matched directly to this county.
With the current South Dakota NWS county crosswalk, most mapped forecast zones behave close to a 1:1 county match; unresolved legacy, coastal, and sub-county forecast zones fall into the excluded bucket.
Direct county match
57.6%
Mapped from forecast zone
42.4%
Not assigned to county ranking
0.0%
Unresolved forecast zones
0
County-level HHS emPOWER counts for electricity-dependent Medicare beneficiaries in South Dakota.
10,695 Medicare beneficiaries in South Dakota have claims associated with electricity-dependent medical equipment. (HHS emPOWER, 2026-03)
County-level HHS emPOWER records for this state. Medicare enrollment data only. 66 counties are included in this state snapshot.
Smaller Medicare base; interpret this percentage with extra caution.
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
65
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 South Dakota only and are not comparable across states.
1. PENNINGTON
County FIPS 46103
At-risk Medicare count
1,794
Storm-event records
1,144
Direct NOAA county match
44.1%
2. MEADE
County FIPS 46093
At-risk Medicare count
439
Storm-event records
1,120
Direct NOAA county match
43.1%
3. MINNEHAHA
County FIPS 46099
At-risk Medicare count
1,534
Storm-event records
496
Direct NOAA county match
81.7%
4. BROWN
County FIPS 46013
At-risk Medicare count
477
Storm-event records
528
Direct NOAA county match
74.8%
5. CUSTER
County FIPS 46033
At-risk Medicare count
242
Storm-event records
571
Direct NOAA county match
37.0%
Treat winter support as the base case, then add enough runtime for food, communications, and medical continuity through a longer Plains event.
Keep heating-system support, communications, and medical essentials online during a winter outage.
Load
1189W
Target
24h
Minimum
46,900 Wh
This assumes your home uses a fuel-fired heating system that still depends on blower power. It does not imply a portable power station can replace electric space heating.
Size this scenario in calculatorAdd refrigeration for a longer winter or high-wind outage where snow, distance, or storm cleanup slow restoration.
Load
1396W
Target
48h
Minimum
110,100 Wh
This is the more realistic South Dakota case for maintaining food, communications, and medical continuity through a multi-day Plains event.
Size this scenario in calculatorCritical Note: No single portable power station in our database covers the full 24-hour baseline at this load (46,900 Wh target vs. 6,144 Wh max in our current database). Use solar recharge, load rotation, or expandable systems for longer events.
Treating South Dakota like a generic winter clone and missing the role of high wind and distance in restoration timing.
Letting flood or wildfire recency dominate planning when the stronger household signal is winter continuity.
Sizing for one night only when storm cleanup and snow can extend the outage window.
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.
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.
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: 56.6 / 100
Rating: Relatively Low
Top modeled hazards: Winter Weather, Hail, Wildfire
Hurricane score: 0.0
Winter Weather score: 85.7
Wildfire score: 75.4
Total (2014-2023): 24
Most recent: 2023-07-06 Flood
| Type | Count |
|---|---|
| Severe Storm | 8 |
| Biological | 5 |
| Fire | 4 |
| Flood | 4 |
| Winter Storm | 3 |
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
South Dakota has an NRI composite risk score of 56.6 (Relatively Low), with 24 federal declarations from 2014 to 2023. NRI's top modeled hazards are Winter Weather, Hail, and Wildfire, while NOAA's outage-relevant record is led by Thunderstorm Wind, High Wind, Flood, and Winter Storm events..
For the primary scenario on this page (24-hour heating-support essential), the estimated minimum is 46,900 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 a short cold snap when South Dakota outages can become multi-day wind-and-winter continuity problems. See the common mistakes section above for more state-specific pitfalls.
