Jefferson County - East-West Gateway Coordinating Council

64
Location or
County
Jefferson County – Section 2
TABLE J37 JEFFERSON COUNTY WINDSTORM OCCURRENCES
1960 TO 2003
Date Time Type Mag 1 Dth 2 Inj 3 PrD 4 CrD 5
106
Herculaneum
05/06/2003 07:05 PM Tstm Wind 60 kts. 0 0 0 0
107 Pevely 05/06/2003 07:05 PM Tstm Wind 60 kts. 0 0 0 0
108 Imperial 06/10/2003 04:50 PM Tstm Wind 60 kts. 0 0 0 0
109 Arnold 06/10/2003 05:00 PM Tstm Wind 55 kts. 0 0 0 0
110 Barnhart 06/10/2003 05:00 PM Tstm Wind 60 kts. 0 0 0 0
111 Arnold 07/18/2003 09:10 AM Tstm Wind 55 kts. 0 0 0 0
112 High
Ridge
07/18/2003 09:10 AM Tstm Wind 55 kts. 0 0 0 0
113 House
Spgs
07/18/2003 09:10 AM Tstm Wind 55 kts. 0 0 0 0
TOTALS: 0 0 877K 0
1Magnitude- measured in knots
2 Death
3 Injuries
4 Property Damage
5 Crop Damage
Source: NCDC
Frequency of Occurrence
The frequency of severe windstorms and tornadoes is difficult to predict. See Figure J42
below. They usually occur mostly during the spring and summer; the tornado season
comes early in the south and later in the north because spring comes later in the year as
one moves northward. Storms usually occur during the late afternoon and early evening,
but they have been known to occur in every state in the United States, on any day of the
year, and at any hour. Table J38 below depicts tornado occurrences are most commonly
seen in the spring months. In the southern states, tornado frequency peaks in March
through May; while in the northern states, peak frequency is during the summer months.
Along the gulf coast, a secondary tornado maximum occurs during the fall. In the western
states, the total number of tornadoes is higher than indicated. Sparse population reduces
the number reported. The map illustrates months of peak tornado activity by state (1950-
1991). (NOAA/NWS)