Expert Witness Testimony & Legal Applications in Meteorology Flashcards

A meteorologist is preparing an expert report regarding lightning strike damage. Which data source would be most directly relevant for establishing where and when lightning struck?

Answer: National Lightning Detection Network (NLDN) stroke data

The NLDN provides time-stamped, geolocated cloud-to-ground lightning stroke data with range accuracy on the order of hundreds of meters, making it the primary source for lightning incident reconstruction.

When testifying, a CCM's expert report is challenged because it did not address a significant body of contradictory peer-reviewed literature. This weakness is best described as:

Answer: Failure to consider alternative explanations or disconfirming evidence, undermining scientific completeness

A scientifically credible expert report must address competing hypotheses and contradictory literature; ignoring them invites successful Daubert challenges and damages the expert's credibility on cross-examination.

In a premises liability case involving a slip-and-fall on ice, which meteorological factor would be most critical to establish the origin of the ice?

Answer: The timing and type of precipitation, temperature trend leading to the event, and any subsequent refreezing cycles

Determining whether ice formed from precipitation, melting/refreezing, or condensation requires a detailed timeline of surface temperature, dew point, and precipitation type to establish causation and foreseeability.

An attorney asks a CCM to state a weather opinion 'to a reasonable degree of meteorological certainty.' This phrase legally implies that:

Answer: The expert holds the opinion with the level of confidence a professional meteorologist would apply in practice, more probably true than not

This legal standard does not require absolute certainty; it requires the expert to hold the opinion to the same professional standard applied in their field and to believe it is more likely true than not (preponderance).

Radar-derived precipitation estimates used in forensic analysis carry inherent uncertainties. The most important caveat when presenting radar QPE (Quantitative Precipitation Estimation) in court is:

Answer: Radar QPE is an indirect estimate subject to beam blockage, brightband effects, and Z-R relationship assumptions that can produce significant errors

Radar QPE involves multiple sources of error including beam overshooting, partial blockage, anomalous propagation, and uncertainty in the Z-R conversion, all of which must be disclosed to maintain scientific integrity.

What is the primary purpose of a meteorological expert conducting a site visit in a forensic investigation?

Answer: To assess local topographic, vegetation, and built-environment factors that may have modified weather conditions at the specific location

Site visits reveal micro-scale factors—drainage patterns, wind channeling by terrain, shading by buildings—that can significantly alter local conditions compared to nearby official observation sites.

A CCM is retained as a consulting (non-testifying) expert versus a testifying expert. What is the key legal difference?

Answer: Consulting experts' work product is generally protected from discovery under attorney-client privilege; testifying experts' materials must be disclosed to opposing counsel

Under FRCP 26(b)(4), materials prepared by a non-testifying consulting expert are ordinarily protected from discovery as work product, whereas testifying experts must disclose their reports, data, and communications with counsel.