Grandfalls-Royalty Independent School District Natural Disasters and Weather Extremes
The chance of earthquake damage in Grandfalls-Royalty Independent School District is about the same as Texas average and is much lower than the national average. The risk of tornado damage in Grandfalls-Royalty Independent School District is much lower than Texas average and is lower than the national average.
Earthquake Index, #97
| Grandfalls-Royalty Independent School District | 0.06 |
| Texas | 0.04 |
| 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, #1
| Grandfalls-Royalty Independent School District | 0.0000 |
| Texas | 0.0000 |
| 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, #1117
| Grandfalls-Royalty Independent School District | 74.65 |
| Texas | 208.58 |
| 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 1,610 other weather extremes events within 50 miles of Grandfalls-Royalty Independent School District were recorded from 1950 to 2010. The following is a break down of these events:
| Type | Count | Type | Count | Type | Count | Type | Count | Type | Count |
| Avalanche: | 0 | Blizzard: | 0 | Cold: | 0 | Dense Fog: | 1 | Drought: | 20 |
| Dust Storm: | 0 | Flood: | 272 | Hail: | 893 | Heat: | 1 | Heavy Snow: | 3 |
| High Surf: | 0 | Hurricane: | 0 | Ice Storm: | 1 | Landslide: | 0 | Strong Wind: | 8 |
| Thunderstorm Winds: | 385 | Tropical Storm: | 0 | Wildfire: | 0 | Winter Storm: | 1 | Winter Weather: | 2 |
| Other: | 23 | ||||||||
Volcanos Nearby
No volcano is found in or near Grandfalls-Royalty Independent School District.
Historical Earthquake Events
A total of 3 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Grandfalls-Royalty Independent School District.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 37.0 | 1976-01-25 | 4.1 | 2 | 31.9 | -103.08 |
| 27.0 | 1982-01-04 | 3.9 | 5 | 31.18 | -102.49 |
| 24.4 | 1978-03-02 | 3.5 | 11 | 31.56 | -102.51 |
Historical Tornado Events
A total of 21 historical tornado events that had recorded magnitude of 2 or above found in or near Grandfalls-Royalty Independent School District.
| Distance (miles) | Date | Magnitude | Start Lat/Log | End Lat/Log | Length | Width | Fatalities | Injuries | Property Damage | Crop Damage | Affected County |
| 2.7 | 1977-04-19 | 3 | 31°25'N / 102°56'W | 31°26'N / 102°52'W | 4.30 Miles | 200 Yards | 0 | 18 | 2.5M | 0 | Ward |
| 10.5 | 1987-05-25 | 2 | 31°27'N / 103°04'W | 31°34'N / 102°55'W | 11.00 Miles | 100 Yards | 0 | 0 | 0K | 0 | Ward |
| 16.2 | 1954-05-29 | 2 | 31°24'N / 102°36'W | 0 | 2 | 0K | 0 | Crane | |||
| 17.3 | 1977-06-30 | 2 | 31°10'N / 103°00'W | 0.50 Mile | 30 Yards | 0 | 0 | 0K | 0 | Pecos | |
| 24.8 | 1954-04-21 | 2 | 31°02'N / 102°53'W | 1.00 Mile | 880 Yards | 0 | 0 | 3K | 0 | Pecos | |
| 30.2 | 1961-09-19 | 2 | 31°27'N / 103°23'W | 0 | 0 | 0K | 0 | Ward | |||
| 30.9 | 1962-07-10 | 2 | 31°24'N / 102°21'W | 0 | 0 | 0K | 0 | Crane | |||
| 32.5 | 1990-04-15 | 2 | 30°54'N / 102°50'W | 30°57'N / 102°48'W | 3.50 Miles | 250 Yards | 0 | 0 | 2.5M | 0 | Pecos |
| 32.8 | 1955-05-30 | 2 | 31°50'N / 103°05'W | 2.00 Miles | 600 Yards | 0 | 0 | 25K | 0 | Winkler | |
| 33.5 | 2010-05-14 | 3 | 31°49'N / 102°43'W | 31°54'N / 102°43'W | 4.00 Miles | 500 Yards | 0 | 0 | 100K | 0K | Ector |
| Brief Description: EVENT NARRATIVE: At 12:15 pm CST, members of the TWISTEX research group confirmed the formation of a tornado approximately 6.5 miles south of Notrees. This tornado progressed northeastward around 20 mph, first causing damage to power poles around from 12:16 to 12:17 pm CST. As it continued to track to the northeast, the tornado caused significant damage to oil equipment from 12:19 to 12:22 pm CST. Two type 320 pump jacks, each weighing 71,000 pounds including the concrete base, were blown over. The tornado then began to weaken at 12:27 pm CST, and dissipated at 12:28 pm CST approximately 2 miles southeast of Notrees, TX. EPISODE NARRATIVE: During the late morning hours, an upper level disturbance slowly progressed over the area. At the surface, abundant low level moisture was available due to southeasterly to easterly winds. A nearly stationary frontal boundary across the Permian basin provided a focus for rapid thunderstorm development. Several supercell thunderstorms resulted in widespread severe weather in the form of tornadoes, flash flooding and large hail across the Texas Permian Basin. The supercell thunderstorms eventually diminished during the late evening hours across the southern Permian Basin. | |||||||||||
| 34.0 | 1961-05-16 | 2 | 30°54'N / 102°53'W | 0.10 Mile | 33 Yards | 0 | 0 | 250K | 0 | Pecos | |
| 34.8 | 1981-10-15 | 2 | 31°39'N / 102°22'W | 1.50 Miles | 30 Yards | 0 | 2 | 25K | 0 | Ector | |
| 35.9 | 1974-04-26 | 2 | 31°25'N / 103°29'W | 0.50 Mile | 110 Yards | 0 | 12 | 250K | 0 | Reeves | |
| 36.0 | 1962-05-17 | 2 | 31°26'N / 103°29'W | 2.00 Miles | 67 Yards | 0 | 3 | 250K | 0 | Reeves | |
| 37.6 | 1954-06-13 | 2 | 31°30'N / 103°30'W | 25.00 Miles | 133 Yards | 0 | 1 | 0K | 0 | Reeves | |
| 38.8 | 1955-05-05 | 2 | 31°25'N / 103°32'W | 0 | 1 | 0K | 0 | Reeves | |||
| 39.9 | 1960-04-21 | 2 | 30°49'N / 102°56'W | 0.30 Mile | 67 Yards | 0 | 0 | 25K | 0 | Pecos | |
| 42.0 | 2010-05-23 | 2 | 31°00'N / 103°25'W | 30°58'N / 103°23'W | 4.00 Miles | 300 Yards | 0 | 0 | 24K | 0K | Reeves |
| Brief Description: EVENT NARRATIVE: A spotter report from a NWS employee and a damage survey both determined that at approximately 1756 CST, a tornado developed about 11 miles southeast of Verhalen, TX. It then moved southeastward damaging a total of 12 powers poles. All but two of these poles were broken into 3 or 4 pieces each. The broken poles were indicative of EF-2 type damage. At 1802 CST, a Pecos County Sherriff???s Deputy took a photo of the tornado near the Pecos and Reeves County line. Finally, at 1806 CST the NWS employee captured the tornado in its dissipating stage. EPISODE NARRATIVE: With persistent low level southeast flow in place across the area and a surface dryline in place from southeast New Mexico across portions of southwest Texas, isolated supercell thunderstorms developed across southern Reeves County and northwest Pecos County. For the second straight evening, these thunderstorms produced tornadoes across the area. | |||||||||||
| 45.5 | 1973-05-12 | 2 | 31°51'N / 102°19'W | 1.00 Mile | 120 Yards | 0 | 0 | 250K | 0 | Ector | |
| 46.3 | 1961-07-21 | 2 | 31°55'N / 102°23'W | 0.50 Mile | 33 Yards | 0 | 0 | 0K | 0 | Ector | |
| 47.7 | 1960-04-26 | 2 | 31°08'N / 102°13'W | 31°08'N / 102°02'W | 10.90 Miles | 200 Yards | 0 | 0 | 3K | 0 | Upton |
* 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.