Alert archive / Texas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 99
The Storm Prediction Center issued this severe thunderstorm watch at May 15, 2018, 4:17 PM MDT for 4 counties in New Mexico; Cimarron County, Texas County, Oklahoma; 30 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 15, 2018, 4:17 PM MDT (22:17 UTC)
- Expired
- May 16, 2018, 12:00 AM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 36 counties
Curry County, NM, Harding County, NM, Quay County, NM, Union County, NM, Cimarron County, OK, Texas County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cottle County, TX, Crosby County, TX, Dallam County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hartley County, TX, Hockley County, TX, Hutchinson County, TX, King County, TX, Lamb County, TX, Lubbock County, TX, Moore County, TX, Motley County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Sherman County, TX, Swisher County, TX
The radar
The Amarillo radar (KAMA), 55 km from the middle of the area, began a volume at 22:17 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
32 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 4:22 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax, Union | 38 min |
| May 15, 4:22 PM MDT | Severe Thunderstorm Warning | LUB | Crosby, Garza | 38 min |
| May 15, 4:25 PM MDT | Severe Thunderstorm Warning | ABQ | Curry, Quay, San Miguel | 50 min |
| May 15, 4:40 PM MDT | Severe Thunderstorm Warning | LUB | Crosby, Lubbock, Lynn | 65 min |
| May 15, 4:51 PM MDT | Severe Thunderstorm Warning | LUB | Hale, Lamb | 54 min |
| May 15, 4:55 PM MDT | Severe Thunderstorm Warning | ABQ | Union | 19 min |
| May 15, 4:56 PM MDT | Severe Thunderstorm Warning | LUB | Crosby, Dickens, Floyd, Motley | 49 min |
| May 15, 5:13 PM MDT | Severe Thunderstorm Warning | ABQ | Curry, Quay | 40 min |
| May 15, 5:19 PM MDT | Severe Thunderstorm Warning | LUB | Hale, Lubbock | 26 min |
| May 15, 5:37 PM MDT | Severe Thunderstorm Warning | AMA | Deaf Smith, Oldham | 68 min |
| May 15, 5:42 PM MDT | Severe Thunderstorm Warning | LUB | Crosby, Dickens, Floyd, Motley | 48 min |
| May 15, 5:44 PM MDT | Severe Thunderstorm Warning | LUB | Crosby, Floyd, Hale, Lubbock | 41 min |
| May 15, 5:57 PM MDT | Severe Thunderstorm Warning | AMA | Cimarron | 33 min |
| May 15, 6:12 PM MDT | Severe Thunderstorm Warning | AMA | Deaf Smith | 63 min |
| May 15, 6:18 PM MDT | Severe Thunderstorm Warning | LUB | Bailey, Castro, Lamb, Parmer | 42 min |
| May 15, 6:26 PM MDT | Severe Thunderstorm Warning | AMA | Deaf Smith | 31 min |
| May 15, 6:28 PM MDT | Severe Thunderstorm Warning | LUB | Briscoe, Floyd, Hale, Hall, Motley, Swisher | 62 min |
| May 15, 6:30 PM MDT | Severe Thunderstorm Warning | LUB | Dickens, Floyd, Motley | 45 min |
| May 15, 6:58 PM MDT | Severe Thunderstorm Warning | LUB | Castro, Hale, Lamb, Parmer, Swisher | 35 min |
| May 15, 7:14 PM MDT | Severe Thunderstorm Warning | LUB | Motley | 31 min |
| May 15, 7:17 PM MDT | Severe Thunderstorm Warning | AMA | Texas | 58 min |
| May 15, 7:17 PM MDT | Severe Thunderstorm Warning | LUB | Castro, Hale, Lamb, Parmer, Swisher | 43 min |
| May 15, 7:41 PM MDT | Severe Thunderstorm Warning | LUB | Cottle, Dickens, King, Motley | 46 min |
| May 15, 7:45 PM MDT | Severe Thunderstorm Warning | LUB | Briscoe, Castro, Floyd, Hale, Lamb, Swisher | 45 min |
| May 15, 7:47 PM MDT | Severe Thunderstorm Warning | AMA | Hansford, Hutchinson, Sherman | 58 min |
| May 15, 8:24 PM MDT | Severe Thunderstorm Warning | LUB | Cottle, Motley | 38 min |
| May 15, 8:27 PM MDT | Severe Thunderstorm Warning | LUB | Briscoe, Crosby, Dickens, Floyd, Hale, Hall and 2 more | 48 min |
| May 15, 8:35 PM MDT | Severe Thunderstorm Warning | AMA | Hansford, Hutchinson, Moore, Ochiltree, Roberts, Sherman | 55 min |
| May 15, 9:06 PM MDT | Severe Thunderstorm Warning | LUB | Childress, Cottle, Dickens, Floyd, Hall, King and 1 more | 39 min |
| May 15, 9:08 PM MDT | Severe Thunderstorm Warning | AMA | Hutchinson, Roberts | 55 min |
| May 15, 10:26 PM MDT | Severe Thunderstorm Warning | AMA | Gray, Wheeler | 64 min |
| May 15, 11:25 PM MDT | Severe Thunderstorm Warning | AMA | Collingsworth, Donley, Gray, Hemphill, Wheeler | 35 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 10.3 hours before the alert went out and 56 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 737 J/kg
- Mixed-layer CIN
- -341 J/kg
- Mixed-layer LCL
- 1037 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 157 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 1:32 PM MDT | Mesoscale Discussion | SPC | Colfax, Curry, Guadalupe, Harding, Mora, Quay and 3 more | 118 min |
| May 14, 6:15 PM MDT | Mesoscale Discussion | SPC | Craig, Nowata, Ottawa, Washington | 90 min |
| May 14, 7:05 PM MDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 11 more | 85 min |
| May 14, 10:30 PM MDT | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 2 more | 90 min |
| May 15, 10:31 AM MDT | Mesoscale Discussion | SPC | Carter, Cleveland, Coal, Garvin, Grady, Johnston and 5 more | 119 min |
| May 15, 2:17 PM MDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Johnston, Love and 5 more | 88 min |
| May 15, 12:51 PM MDT | Mesoscale Discussion | SPC | Borden, Coke, Crockett, Crosby, Dawson, Dickens and 22 more | 114 min |
Nearby
Severe Thunderstorm Watches in Texas, 2018Severe Thunderstorm Watches in New Mexico, 2018Severe Thunderstorm Watches in Oklahoma, 2018Every severe thunderstorm watch in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.