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Snohomish County Natural Disasters and Weather Extremes

 
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The chance of earthquake damage in Snohomish County is lower than Washington average and is higher than the national average. The risk of tornado damage in Snohomish County is about the same as Washington average and is much lower than the national average.

Topics:Earthquake IndexVolcano IndexTornado IndexOther Weather Extremes EventsVolcanos NearbyHistorical Earthquake EventsHistorical Tornado Events

Earthquake Index, #5

Snohomish County
2.88
Washington
4.04
U.S.
1.81

The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.

Volcano Index, #13

Snohomish County
0.0077
Washington
0.0135
U.S.
0.0023

The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.

Tornado Index, #9

Snohomish County
10.65
Washington
9.06
U.S.
136.45

The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.

Other Weather Extremes Events

A total of 411 other weather extremes events within 50 miles of Snohomish County were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:1Blizzard:0Cold:1Dense Fog:0Drought:3
Dust Storm:0Flood:80Hail:44Heat:0Heavy Snow:30
High Surf:0Hurricane:0Ice Storm:0Landslide:0Strong Wind:47
Thunderstorm Winds:27Tropical Storm:0Wildfire:8Winter Storm:1Winter Weather:2
Other:167 

Volcanos Nearby

A total of 3 volcanoes are found in or near Snohomish County.

Distance (miles)NameRegionLatitudeLongitudeElevation (foot)TypeStatusLast Eruption
30.4Glacier PeakUS-Washington, United States48.112-121.1133213StratovolcanoTephrochronologyLast known eruption 1700-1799
50.5BakerUS-Washington, United States48.786-121.823285StratovolcanoHistoricalLast known eruption 1800-1899
81.8RainierUS-Washington, United States46.87-121.7584392StratovolcanoDendrochronologyLast known eruption 1800-1899

Historical Earthquake Events

A total of 18 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Snohomish County.

Distance (miles)DateMagnitudeDepth (km)LatitudeLongitude
45.31945-04-295.5N/A47.4-121.7
48.31965-10-234.8N/A47.5-122.4
36.31969-11-104.7N/A48.52-121.4
39.01971-12-284.42747.58-122.22
45.41977-07-104.31148.53-122.45
10.11969-11-014.1N/A47.92-121.85
29.01964-10-154.1N/A47.7-122.1
44.71979-11-264.12048.54-122.41
33.01978-12-3142047.58-121.85
34.81970-02-103.93347.7-122.3
11.11980-09-193.8647.91-121.87
31.21981-11-123.72647.94-122.42
39.41966-06-113.7N/A47.83-122.55
13.11981-03-153.6547.99-121.5
32.61976-01-313.61848.35-122.32
36.91979-02-013.6947.53-121.92
31.41973-06-093.5N/A47.6-121.8
48.41981-11-263.52247.65-122.62

Historical Tornado Events

A total of 3 historical tornado events that had recorded magnitude of 2 or above found in or near Snohomish County.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
17.21986-05-13248°13'N / 122°03'W0.30 Mile33 Yards000K0Snohomish
20.21970-11-24248°06'N / 122°12'W0.30 Mile30 Yards0025K0Snohomish
46.21969-12-12347°30'N / 122°24'W47°32'N / 122°19'W3.80 Miles100 Yards01250K0King


* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.


 
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