Alert archive / Colorado / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 341
The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2018, 12:47 PM MDT for 14 counties in Colorado; 5 counties in New Mexico. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2018, 12:47 PM MDT (18:47 UTC)
- Expired
- Aug 18, 2018, 8:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Baca County, CO, Bent County, CO, Cheyenne County, CO, Crowley County, CO, El Paso County, CO, Elbert County, CO, Huerfano County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Otero County, CO, Prowers County, CO, Pueblo County, CO, Colfax County, NM, Harding County, NM, Mora County, NM, San Miguel County, NM, Union County, NM
The radar
The Pueblo radar (KPUX), 102 km from the middle of the area, began a volume at 18:48 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
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:49 PM MDT | Severe Thunderstorm Warning | PUB | Huerfano, Las Animas | 26 min |
| Aug 18, 1:59 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax, Taos | 24 min |
| Aug 18, 2:12 PM MDT | Severe Thunderstorm Warning | PUB | Las Animas | 31 min |
| Aug 18, 2:18 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax | 42 min |
| Aug 18, 2:56 PM MDT | Flash Flood Warning | ABQ | Colfax | 3 hr |
| Aug 18, 2:58 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax | 62 min |
| Aug 18, 3:05 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax | 40 min |
| Aug 18, 3:12 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax | 33 min |
| Aug 18, 3:21 PM MDT | Severe Thunderstorm Warning | PUB | Las Animas | 39 min |
| Aug 18, 3:23 PM MDT | Severe Thunderstorm Warning | GLD | Kit Carson, Yuma | 52 min |
| Aug 18, 4:19 PM MDT | Severe Thunderstorm Warning | ABQ | Union | 28 min |
| Aug 18, 4:43 PM MDT | Severe Thunderstorm Warning | ABQ | Colfax, Harding, Union | 47 min |
| Aug 18, 5:16 PM MDT | Severe Thunderstorm Warning | PUB | Baca, Bent, Prowers | 32 min |
| Aug 18, 5:31 PM MDT | Severe Thunderstorm Warning | ABQ | Harding, Mora, San Miguel | 59 min |
| Aug 18, 5:53 PM MDT | Severe Thunderstorm Warning | PUB | Kiowa, Prowers | 30 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
Denver, CO (KDEN), launched 12:00Z, 6.8 hours before the alert went out and 234 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
- 412 J/kg
- Mixed-layer CIN
- -229 J/kg
- Mixed-layer LCL
- 1881 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 13 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 |
|---|---|---|---|---|
| Aug 18, 12:25 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Crowley, El Paso, Kiowa and 5 more | 2 hr |
| Aug 18, 2:26 PM MDT | Mesoscale Discussion | SPC | Phillips, Sedgwick | 3 hr |
| Aug 18, 2:50 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Crowley, Elbert, El Paso and 7 more | 55 min |
| Aug 18, 5:34 PM MDT | Mesoscale Discussion | SPC | Baca, Prowers | 116 min |
Nearby
Severe Thunderstorm Watches in Colorado, 2018Severe Thunderstorm Watches in New Mexico, 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.