Alert archive / Arizona / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 437
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2015, 1:07 PM MST for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2015, 1:07 PM MST (20:07 UTC)
- Expired
- Jul 18, 2015, 5:58 PM MST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties La Paz County, AZ, Mohave County, AZ, Yuma County, AZ, Imperial County, CA, Riverside County, CA, San Bernardino County, CA, Clark County, NV, Lincoln County, NV, Beaver County, UT, Iron County, UT, Washington County, UT
The radar
The Las Vegas radar (KESX), 85 km from the middle of the area, began a volume at 20:08 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
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 1:07 PM MST | Flash Flood Warning | VEF | Mohave | 6 hr |
| Jul 18, 1:23 PM MST | Flash Flood Warning | VEF | Mohave | 6 hr |
| Jul 18, 1:26 PM MST | Flash Flood Warning | VEF | Lincoln | 5 hr |
| Jul 18, 1:27 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 58 min |
| Jul 18, 1:36 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 39 min |
| Jul 18, 1:43 PM MST | Severe Thunderstorm Warning | PSR | Imperial | 32 min |
| Jul 18, 1:44 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 61 min |
| Jul 18, 1:50 PM MST | Flash Flood Warning | VEF | Mohave | 5 hr |
| Jul 18, 1:51 PM MST | Flash Flood Warning | SLC | Washington | 3 hr |
| Jul 18, 2:11 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 49 min |
| Jul 18, 2:20 PM MST | Flash Flood Warning | VEF | Mohave | 6 hr |
| Jul 18, 3:19 PM MST | Severe Thunderstorm Warning | VEF | Mohave | 26 min |
| Jul 18, 3:23 PM MST | Flash Flood Warning | SLC | Iron, Kane, Washington | 4 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 11:53 AM MST | Mesoscale Discussion | SPC | La Paz, Mohave, Yuma | 67 min |
| Jul 18, 3:53 PM MST | Mesoscale Discussion | SPC | La Paz, Maricopa, Mohave, Yavapai, Yuma | 67 min |
Nearby
Severe Thunderstorm Watches in Arizona, 2015Severe Thunderstorm Watches in California, 2015Severe Thunderstorm Watches in Utah, 2015Every severe thunderstorm watch in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.