CCM Applied and Forensic Meteorology 2 — Questions and Answers
Question 1: In forensic meteorology, when reconstructing past weather conditions for a slip-and-fall lawsuit, which data source is generally considered most legally defensible?
- Personal weather station data from a nearby homeowner
- Archived ASOS/AWOS data from the nearest certified weather station (Correct answer)
- Newspaper weather summaries from the day in question
- Social media posts describing conditions at the time
Correct answer: Archived ASOS/AWOS data from the nearest certified weather station
ASOS/AWOS data from FAA/NWS-certified automated surface observing stations provides calibrated, time-stamped records that meet legal standards for evidentiary reliability.
Question 2: A consulting meteorologist is hired to assess wind damage to a warehouse roof. The insured claims straight-line winds caused the damage, while the insurer suspects a tornado. Which observational signature would most strongly support the tornado hypothesis?
- Uniform directional pattern of debris scatter across the site
- Convergent or rotational debris scatter pattern on the roof and surroundings (Correct answer)
- Damage confined to the windward side of the structure
- High-water marks on the exterior walls
Correct answer: Convergent or rotational debris scatter pattern on the roof and surroundings
Tornadoes produce rotational or convergent debris patterns, while straight-line winds produce a more uniform, unidirectional debris scatter.
Question 3: When computing the probability that a historical weather event occurred at a specific location and time for litigation, what is the primary limitation of using gridded reanalysis data (e.g., NARR, ERA5)?
- Reanalysis data is too expensive to license for legal use
- Spatial resolution may be too coarse to capture local microclimatic conditions (Correct answer)
- Reanalysis datasets do not include temperature variables
- Reanalysis data is only available in real time, not historically
Correct answer: Spatial resolution may be too coarse to capture local microclimatic conditions
Reanalysis grids typically resolve at 12–32 km or coarser, which can miss local topographic or urban effects critical to site-specific forensic assessments.
Question 4: A CCM providing expert witness testimony about a hailstorm should most accurately describe hail size using which reference standard?
- Comparison to common objects (pea, golf ball, grapefruit) per NWS standard sizes (Correct answer)
- The Beaufort scale hail intensity index
- The TORRO hailstorm intensity scale only
- Doppler radar reflectivity values alone
Correct answer: Comparison to common objects (pea, golf ball, grapefruit) per NWS standard sizes
The NWS uses standardized object comparisons (pea=0.25 in, quarter=1 in, golf ball=1.75 in, etc.) that are widely recognized and legally accepted for describing hail size.
Question 5: In an agricultural insurance dispute over crop freeze damage, which tool best determines whether a damaging temperature threshold was reached at canopy level rather than screen height?
- Upper-air radiosonde sounding
- Crop-level temperature sensors or agricultural weather station at plant height (Correct answer)
- Standard 2-meter AGL shelter temperature from a distant ASOS
- Satellite-derived land surface temperature
Correct answer: Crop-level temperature sensors or agricultural weather station at plant height
Screen-height (2 m) temperatures can differ significantly from canopy temperatures due to radiative cooling at the surface, so crop-level sensors provide the most accurate freeze assessment.
Question 6: A forensic meteorologist is asked whether a road was icy at the time of a vehicle accident. Which combination of conditions is most critical to establishing the likelihood of black ice formation?
- High relative humidity, air temperature well above freezing, and overcast skies
- Sub-freezing surface temperature, recent precipitation or fog, and calm clear-sky radiative cooling (Correct answer)
- Strong daytime solar insolation and wind speeds above 15 mph
- Convective instability and afternoon thunderstorm activity
Correct answer: Sub-freezing surface temperature, recent precipitation or fog, and calm clear-sky radiative cooling
Black ice forms when surface temperatures are below freezing and moisture is available from recent precipitation, freezing drizzle, or fog, often enhanced by radiative cooling on clear, calm nights.
Question 7: When a consulting meteorologist prepares a Weather Deviation Report for a construction contractor claiming weather delays, which metric is typically compared against contract baseline assumptions?
- Percent of days exceeding a specified adverse-weather threshold versus the historical mean (Correct answer)
- Total annual precipitation compared to global averages
- Number of tornado watches issued during the project period
- Satellite-derived cloud cover percentage
Correct answer: Percent of days exceeding a specified adverse-weather threshold versus the historical mean
Weather Deviation Reports typically compare actual adverse-weather days (e.g., days with precipitation exceeding 0.1 in or winds above a threshold) against the historical average for the same period to quantify abnormal delays.
CCM Applied and Forensic Meteorology 2
In forensic meteorology, when reconstructing past weather conditions for a slip-and-fall lawsuit, which data source is generally considered most legally defensible?