How AccuWeather Forensic Meteorologists Analyze Snow Depth and Ice Formation in Premises Liability Cases
With more than 7,000 forensic reports delivered and testimony provided in hundreds of trials, AccuWeather Forensics Services has earned a reputation for delivering scientifically defensible weather analysis that withstands courtroom scrutiny.
>>Learn more about AccuWeather For Business
Snapped tree limbs that fell on vehicles in the Denver area on May 6, 2026, amid heavy snow. (AccuWeather/Tony Laubach)
Executive Summary
Winter slip-and-fall cases often hinge on one critical question: Did naturally occurring weather conditions create the hazardous surface, or did other factors contribute to the incident? Determining the answer requires far more than reviewing a historical weather report.
AccuWeather Forensic Services reconstructs site-specific weather conditions using certified forensic meteorology, historical observations, radar, satellite imagery, temperature trends, precipitation history, and proprietary weather data to help attorneys, insurers, and investigators understand exactly how snow depth and ice formation developed at a precise location and time.
Key Takeaways
• Snow depth alone does not determine whether hazardous conditions existed.
• Ice formation depends on multiple weather variables, including temperature, precipitation timing, freeze-thaw cycles, sun angle, and surface characteristics.
• Site-specific forensic analysis can distinguish between naturally occurring ice and ice created by non-weather-related sources.
• Certified forensic meteorologists provide objective, scientifically defensible findings supported by historical weather reconstruction and expert testimony.
• Accurate weather analysis strengthens premises liability investigations, insurance claims, and courtroom presentations.
Premises liability cases involving snow and ice frequently require answers that standard weather reports cannot provide. Airport observations or regional forecasts rarely reflect the exact conditions that existed on a particular sidewalk, parking lot, staircase, or entrance at the moment an incident occurred.
AccuWeather forensic meteorologists reconstruct historical weather conditions at the specific address in question, evaluating the interaction between snowfall, temperatures, precipitation type, melting, refreezing, and localized environmental conditions to determine whether weather contributed to the event.
Traffic was sparse near downtown on 35W during the snow storm in Minneapolis, Minn., on Sunday, March 15, 2026. Heavy snow and rising winds closed roads and canceled hundreds of flights and school days in multiple cities across Minnesota. (Photo by Richard Tsong-Taatarii/The Minnesota Star Tribune via Getty Images)
The complexity of ice
Snow depth analysis extends well beyond measuring how much snow fell during a storm. Forensic meteorologists examine snowfall rates, accumulation, compaction, melting, runoff, evaporation, and subsequent weather conditions to determine how snow cover changed over time.
They also evaluate whether snow removal activities would have had sufficient opportunity to occur and whether remaining snow or slush could realistically have produced hazardous conditions at the reported time of an incident.
Ice formation is even more complex. Air temperature alone does not determine whether ice develops.
AccuWeather experts evaluate ground temperatures, freeze-thaw cycles, solar radiation, shading, slope, drainage patterns, wind exposure, humidity, and precipitation history to determine whether natural weather conditions could have produced ice. They also assess whether water originated from weather events or from non-natural sources such as irrigation systems, leaking pipes, gutters, or drainage problems.
One recent premises liability investigation in Evanston, Illinois demonstrates the importance of this detailed analysis. After a plaintiff alleged that naturally occurring ice caused a slip-and-fall injury, AccuWeather forensic meteorologists reconstructed the weather leading up to the incident.
Their investigation determined that rainfall occurring approximately 48 hours earlier had completely dried, and prevailing weather conditions would not have allowed natural condensation, frost, or dew to produce the ice. The analysis concluded that any ice present would have resulted from a non-natural water source rather than meteorological conditions.
A view of a snow-covered street after a powerful, multiday blizzard dumped about 19 inches of snow in Long Island City, New York, United States on Feb. 23, 2026. (Photo by Selcuk Acar/Anadolu via Getty Images)
Another winter premises liability case in New Jersey required investigators to determine whether slush had frozen into solid ice before a reported fall. By examining snowfall timing, rainfall, temperatures, and the transition from snow to rain, AccuWeather determined that above-freezing temperatures prevented slush from freezing into solid ice before the incident.
The expert meteorological analysis demonstrated that the reported conditions were inconsistent with the documented weather, ultimately supporting dismissal of the case.
These conclusions are possible because AccuWeather forensic meteorologists analyze one of the industry's most comprehensive collections of historical weather information, including radar, satellite imagery, lightning data, surface observations, proprietary datasets, and localized weather records. Their findings are presented in certified forensic reports that are suitable for legal proceedings, regulatory matters, insurance investigations, and expert testimony.
With more than 7,000 forensic reports delivered and testimony provided in hundreds of trials, AccuWeather has earned a reputation for delivering scientifically defensible weather analysis that withstands courtroom scrutiny.
When snow depth and ice formation become central issues in premises liability litigation, objective scientific analysis can make the difference between assumption and evidence. By reconstructing weather conditions at the exact location and time of an incident, AccuWeather Forensic Services helps attorneys, insurers, and investigators establish causation, evaluate liability, and present clear, credible conclusions supported by experienced Certified Consulting Meteorologists and the most comprehensive historical weather data available.
Action Steps
• Engage a forensic meteorologist as early as possible when snow or ice conditions may affect liability.
• Request a site-specific weather reconstruction rather than relying solely on airport observations or generalized weather reports.
• Evaluate temperature trends, snow accumulation, precipitation history, and freeze-thaw cycles alongside maintenance records.
• Use certified forensic reports and expert testimony to strengthen claims investigations and litigation strategy.
• Consult AccuWeather Forensic Services to obtain scientifically defensible weather analysis that supports informed legal and insurance decisions.
Why attorneys and insurers use AccuWeather Forensics
AccuWeather Forensic Meteorologists provide objective weather reconstruction and analysis that clarify environmental conditions surrounding disputed events. Using the greatest collection of weather-related data available, including publicly available and proprietary data sets, our experts analyze historical weather records, local observation data, snow and ice conditions, precipitation history and temperature trends to support insurance disputes, accident investigations, property damage cases and other litigation.
Report a Typo
