Gillespie County Natural Disasters and Weather Extremes
The chance of earthquake damage in Gillespie County is about the same as Texas average and is much lower than the national average. The risk of tornado damage in Gillespie County is much lower than Texas average and is lower than the national average.
Earthquake Index, #184
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, #1
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, #189
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 7,713 other weather extremes events within 50 miles of Gillespie County were recorded from 1950 to 2010. The following is a break down of these events:
|Dust Storm:||1||Flood:||2,035||Hail:||3,362||Heat:||10||Heavy Snow:||43|
|High Surf:||0||Hurricane:||1||Ice Storm:||26||Landslide:||0||Strong Wind:||61|
|Thunderstorm Winds:||1,795||Tropical Storm:||6||Wildfire:||19||Winter Storm:||43||Winter Weather:||36|
No volcano is found in or near Gillespie County.
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Gillespie County.
No historical earthquake events found in or near Gillespie County.
Historical Tornado Events
A total of 26 historical tornado events that had recorded magnitude of 2 or above found in or near Gillespie County.
|Distance (miles)||Date||Magnitude||Start Lat/Log||End Lat/Log||Length||Width||Fatalities||Injuries||Property Damage||Crop Damage||Affected County|
|4.8||1989-05-17||2||30°21'N / 98°52'W||2.00 Miles||100 Yards||0||0||0K||0||Gillespie|
|8.5||1962-05-28||2||30°17'N / 98°51'W||30°17'N / 98°46'W||5.10 Miles||100 Yards||0||0||0K||0||Gillespie|
|12.5||1965-05-16||2||30°30'N / 99°00'W||0.20 Mile||33 Yards||0||0||0K||0||Gillespie|
|15.3||1999-05-11||3||30°18'N / 99°12'W||30°15'N / 99°11'W||3.50 Miles||200 Yards||0||0||1.0M||100K||Gillespie|
|Brief Description: The tornado was preceded by strong, gusty winds, very heavy rainfall and finally, large hail. Severe winds in advance of the tornado took a roof off the High School in Harper and laid it on the ground on the opposite side of the building. These winds also damaged several other roofs in the area. The tornado began its track around three miles east of Harper, moving toward the southeast. It lifted post oak trees out of the ground with their roots in tact. Approximately 2 miles down the path, it turned toward the south and continued for another 1.5 miles. Along its track, it destroyed. 35 homes, 10 mobile homes, and damaged or destroyed 25 outbuildings and barns. The tornado damage several vehicles and tossed one jeep over 100 yards.|
|17.6||2001-10-12||3||30°15'N / 98°40'W||30°16'N / 98°39'W||2.50 Miles||400 Yards||0||5||1.0M||100K||Gillespie|
|Brief Description: The strongest of the Friday night tornadoes struck the town of Stonewall. This tornado, rated F3 on the Fujita Scale, was preceded by brief gusty winds of 30 to 40 miles per hour, very heavy rainfall and spotty .5-inch hail. The tornado formed around 830 pm CST near the intersection of Hahn Road and SH290. It moved north-northeastward for .75 miles, crossing SH290 and the Pedernales River. Just north of the river, it made a slight turn toward the east, now moving another mile toward the northeast. It crossed North River Road and continued over open country until it crossed Ranch Road 1623. After passing RR1623 for approximately .25 miles, it dissipated. The worst damage, F3 level, was to trees and homes between RR1623 and SH290, across the northwest and north central part of Stonewall. Ninety homes sustained damage with 6 destroyed. In addition, 7 mobile homes were destroyed and 20 damaged. Damage was also reported to 22 buildings. A two-story home had the entire second story destroyed, and a concrete building lost most of its walls and all of its roof. Other damage along the path typically included destroyed and damaged roofs and walls of homes and businesses as well as widespread damage to trees. The tornado path was approximately .25 miles in width and 2.5 miles in length. Although the tornado was not seen due to the late hour and darkness, residents did report that after heavy rain and hail, the wind became calm, and it was followed by a "roaring sound" so often reported in tornadoes. Five persons were injured with one man hospitalized as a result of the tornado.|
|21.1||1970-05-15||2||30°15'N / 98°36'W||0.50 Mile||27 Yards||0||0||3K||0||Gillespie|
|23.2||1959-11-03||2||29°57'N / 99°02'W||30°02'N / 98°55'W||9.10 Miles||1760 Yards||0||0||25K||0||Kerr|
|24.4||1999-05-11||4||30°41'N / 99°06'W||30°39'N / 99°00'W||7.00 Miles||1400 Yards||1||6||750K||250K||Mason|
|Brief Description: A large multiple-vortex tornado ripped through eastern Mason County during the late afternoon hours. The slow moving tornado first touched down near the Llano River 9 miles northwest of Loyal Valley and then travelled a 7-mile long path, finally dissipating 5 miles north of Loyal Valley. This tornado, whose width would reach three-quarters of a mile wide at times, caused widespread devastation. Two homes were completely destroyed, with debris scattered over great distances. Large pieces of a pick-up truck were located three-quarters of a mile away from the house where it had been left. Tragically, one person was killed and 5 others were injured when that same house was destroyed. The people had sought refuge in a car in a stone garage, but as the tornado tore across the garage, debris smashed through the car, killing one man and injuring the remaining occupants. Sixteen other houses were damaged, along with additional barns and outbuildings. Numerous head of cattle and deer were also killed as the tornado passed. When the tornado crossed Farm-to-Market Road 152, a stretch of asphalt 720 feet wide was ripped off of the road surface. M75PH A series of supercell thunderstorms ripped across the Heartland and Northwest Hill Country on the afternoon of the 11th. Three tornadoes would touch down, including a devastating F4 tornado north of Loyal Valley in eastern Mason County. One person was killed and 6 others injured as the three-quarters of a mile tornado tracked a 7 mile long path.|
|24.9||1971-02-25||2||30°10'N / 99°19'W||0.30 Mile||300 Yards||0||0||3K||0||Kerr|
|26.6||1969-05-06||3||30°06'N / 98°35'W||30°07'N / 98°34'W||2.30 Miles||100 Yards||0||0||25K||0||Kendall|
|27.5||1976-03-30||2||29°56'N / 98°55'W||29°58'N / 98°40'W||15.20 Miles||200 Yards||0||0||2.5M||0||Kendall|
|27.7||1965-06-06||2||30°35'N / 99°18'W||1.00 Mile||200 Yards||0||0||0K||0||Mason|
|28.7||1969-05-06||3||30°07'N / 98°34'W||30°17'N / 98°24'W||15.20 Miles||100 Yards||0||2||25K||0||Blanco|
|30.1||1980-08-10||2||30°06'N / 98°25'W||30°08'N / 98°35'W||10.40 Miles||33 Yards||0||0||25.0M||0||Blanco|
|31.6||1983-03-04||2||29°54'N / 98°50'W||29°52'N / 98°47'W||4.00 Miles||100 Yards||0||1||250K||0||Kendall|
|34.0||1969-05-06||3||30°17'N / 98°24'W||30°29'N / 98°21'W||14.20 Miles||100 Yards||0||0||25K||0||Blanco|
|37.0||1957-03-31||2||29°49'N / 98°45'W||1.50 Miles||880 Yards||0||0||3K||0||Kendall|
|38.4||1979-03-02||3||30°46'N / 99°23'W||30°47'N / 99°16'W||7.10 Miles||150 Yards||0||1||2.5M||0||Mason|
|39.0||1969-05-06||3||30°29'N / 98°21'W||30°35'N / 98°19'W||7.20 Miles||100 Yards||0||0||25K||0||Burnet|
|43.6||1975-05-07||2||30°43'N / 98°22'W||0||0||250K||0||Travis|
|44.0||1950-05-15||2||29°47'N / 98°50'W||29°40'N / 98°34'W||18.00 Miles||33 Yards||0||0||25K||0||Kendall|
|44.9||1994-05-13||3||30°34'N / 98°16'W||30°36'N / 98°14'W||3.50 Miles||800 Yards||0||1||5.0M||50K||Burnet|
|Brief Description: The storm approached the city from the west-southwest. There were unconfirmed reports of funnels in the Horseshoe Bay area, four miles southwest of Marble Falls, before the storm arrived. Spotty damage was reported to roofs in the Horseshoe Bay area. The tornado first struck the west side of the city, crossing a heavy commercialized and residential area. Roofs were severely damaged at this time with several structures sustaining F1 and F2 damage. Several boats at a dealership were tossed on top of each other. Two-by-four's were embedded into the side of a church preschool care center, penetrating an inside classroom wall by four to five feet. Fortunately, all children had been moved into hallways just before the tornado arrived. Numerous commerical signs were down with widespread roof damage. This damage became even more extensive as the tornado moved across the northern part of the city. Marble Falls primary school also sustained damage, but students had been evacuated to the main school. Trees were uprooted on the school grounds and damage was reported to outbuildings. Metal I-beams were bent at a nearby metal building, indicating F2 to F3 damage. Three nearby semi-tractor trailer delivery trucks and a bread delivery truck were overturned. Two of these trucks were reported to have been lifted "two to three feet off of the ground" as they were overturned. At a nearby Wal-Mart department store 100 to 200 employees had taken shelter, having practiced their severe weather drill the day before. The store was hit and severely damaged, with the employees sustaining only a few minor injuries. Additional roof damage was reported at Marble Falls High School. Students had just executed a tornado drill as the storm struck. There was extensive peeling of metal from the auditorium and gymnasium roofs. In summary, over 440 homes sustained damage, with one house and 17 mobile homes destroyed and major damage to 36 homes. Eighteen businesses reported major damage with 47 others reporting minor damage. In addition, two bridges were damaged, along with severe damage to schools. In all, 512 structures sustained damage.|
|47.1||1980-08-10||2||29°54'N / 98°05'W||30°06'N / 98°25'W||24.20 Miles||33 Yards||0||0||25.0M||0||Hays|
|47.8||1999-03-12||2||31°00'N / 99°11'W||30°59'N / 99°09'W||2.00 Miles||75 Yards||0||0||100K||0||Mcculloch|
|Brief Description: A tornado touched down southeast of Brady, heavily damaging a house and a barn. Several rounds of thunderstorms developed across West Central Texas on the morning and afternoon of the 12th. The first round of storms brought dime to golf ball size hail to parts of the Northern Edwards Plateau, Concho Valley, and the Heartland. A second round of storms that developed during the early afternoon produced a supercell across the southern Heartland. This storm dropped a tornado south of Brady in Southern McCulloch County, as well as hail up the size of golf balls in the town of Brady itself. As the supercell moved into San Saba County, a second tornado would touch down. This tornado had an 8 mile long path and was 100 yards wide, passing 8 miles south of Richland Springs. Although each tornado would produce damage, no injuries or deaths were reported.|
|48.4||1970-04-18||2||29°40'N / 98°40'W||0.50 Mile||67 Yards||0||0||25K||0||Bexar|
|49.4||1958-05-03||2||29°43'N / 98°41'W||29°43'N / 98°20'W||21.00 Miles||67 Yards||0||0||25K||0||Bexar|
* 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.