ZIP code 21791, covering Unionville, MD, has 53 natural disaster events in the historical record. These include 21 hailstorms, 12 tornadoes, and 8 severe wind events. Total documented property damage amounts to $3.4M. Across all recorded events, 2 deaths have been attributed to natural disasters in this area.
With 21 recorded incidents (40% of all events), hailstorms are the leading natural hazard for this ZIP code. Hail-related events have caused a combined $15K in documented property damage. The most recent recorded hailstorm occurred on Mar 16, 2025.
There have been 12 recorded tornadoes in this area, representing 23% of all disaster events. Tornado-related events have caused a combined $1.2M in documented property damage. The most recent recorded tornado occurred on Apr 13, 2020.
Unionville has experienced 8 severe wind events on record. Wind-related events have caused a combined $1.7M in documented property damage. The most recent recorded severe wind event occurred on Apr 19, 2025.
Unionville has experienced 5 blizzards on record. Of these, 2 (40%) were rated at severity level 4 or 5 — the most intense on the normalized scale. The highest recorded severity for winter storm events here is 5/5 (extreme). Winter storm events have caused a combined $172.5K in documented property damage. The most recent recorded blizzard occurred on Feb 5, 2010.
Unionville has experienced 3 floods on record. One event reached severity level 4 or 5 on the normalized scale. The highest recorded severity for flood-related events here is 5/5 (extreme). Flood-related events have caused a combined $230K in documented property damage. The most recent recorded flood occurred on Aug 4, 2018.
Unionville has experienced 2 extreme cold events on record. Cold-related events have caused a combined $52.5K in documented property damage. The most recent recorded extreme cold event occurred on Mar 11, 1998.
The most significant disaster event on record for Unionville was 81 mph Thunderstorm Wind on Apr 19, 2025, which caused $1M in property damage. Another major event was EF1 Tornado (Feb 7, 2020), causing $574K in damages.
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Based on federal and state records, ZIP code 21791 has experienced 53 natural disaster events. The hazard types affecting this area include hailstorms (21 events), tornadoes (12 events), severe wind events (8 events), blizzards (5 events), floods (3 events), extreme cold events (2 events), and extreme heat events (2 events). The primary hazard is hailstorms, which account for 40% of all recorded events.
Hailstorms are the most frequently recorded hazard in Unionville, MD, with 21 events documented. These events have caused a combined $15K in property damage.
Yes, Unionville (ZIP 21791) has 3 recorded flood events. These floods have caused $230K in total property damage. The most recent flood on record occurred on Aug 4, 2018.
Unionville has 12 recorded tornado events in the historical record. Total property damage from tornadoes in this area is $1.2M. The most recent tornado was recorded on Apr 13, 2020.
The most damaging natural disaster on record for ZIP code 21791 was 81 mph Thunderstorm Wind, which occurred on Apr 19, 2025. This event caused $1M in documented property damage. It was rated at severity level 2/5.
Natural disasters have caused a documented total of $3.4M in property damage in the Unionville, MD area (ZIP 21791). This figure is based on historical records from FEMA, NOAA Storm Events Database, and USGS, and covers events from the 1950s through the present. Actual damages may be higher, as not all events have complete damage assessments.
Data sourced from FEMA (disaster declarations, NFIP flood claims), NOAA Storm Events Database, USGS Earthquake Hazards Program, and NIFC wildfire records. Historical coverage varies by source, with most records beginning in the 1950s–1970s. Full methodology →