EvacWatch | Wildfire Evacuation Risk

How to read this map

Hazard / signal: Wildfire proximity and condition
Exposure: Population
Consequence / vulnerability: SVI, fire-weather and access context

Official/source values remain distinct from MitchellCo derived screening scores or estimates. Derived values are for prioritization and interpretation, not official warnings or predictions.

Where are populated, vulnerable communities closest to active wildfire perimeters?

Fuses wildfire proximity and condition with population, social vulnerability and fire-weather context. Non-official screening map: not an evacuation order, route planner or fire-spread prediction.

Data health

NIFC fire perimetersLoading

NWS fire weatherLoading

CDC county / SVILoading

Census roadsOff

Oldest consequential input: waiting…

LayersCurrent wildfire perimetersFire-weather alertsDerived evacuation concernPrimary + secondary roads

Highest derived evacuation concern

#	County	Nearest fire	Score
Waiting for regional layers…

How the score works

Hazard, max 75
distance: 45 / 35 / 25 / 15 at ≤2 / 10 / 25 / 50 km
fire size: min(15, 3 × log10(acres + 1))
uncontained: 15 × (1 − containment/100)

Exposure, max 10
population: min(10, 2 × log10(population))

Vulnerability, max 15
SVI: 15 × overall SVI rank

Context
NWS Red Flag / Fire Weather Watch: displayed separately as +10 context; total capped at 100. Distance uses a representative county interior point.

Loading & reliability

Regional queries reduce geometry. Live requests use timeouts, retry transient failures with exponential backoff, cache the last successful regional response in the browser, prevent overlapping requests and pause scheduled refresh while hidden or offline. Fire-weather alerts that use NWS zone identifiers are resolved to official NWS zone geometry before display. A cached response is labeled Cached, never Live.

Sources & refresh

NIFC WFIGS Current Interagency Fire Perimeters: selected-region query; 10 min.

National Weather Service Alerts API: active Red Flag Warnings and Fire Weather Watches; zone-based alerts are resolved through their official NWS affected-zone resources; 5 min.

CDC/ATSDR SVI 2022: county population and SVI; static 2022 vintage.

U.S. Census TIGERweb Transportation: 2025 primary/secondary roads; context only, not closures or evacuation routes.

Omitted: nationwide evacuation orders and road closures because no authoritative, consistently structured, anonymous nationwide browser endpoint was verified.

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