Alert archive / California / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 896
The Storm Prediction Center issued this severe thunderstorm watch at Aug 26, 2003, 1:55 PM MST for La Paz County, Yuma County, Arizona; Imperial County, Riverside County, San Bernardino County, California. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 26, 2003, 1:55 PM MST (20:55 UTC)
- Expired
- Aug 26, 2003, 7:00 PM MST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties La Paz County, AZ, Yuma County, AZ, Imperial County, CA, Riverside County, CA, San Bernardino County, CA
The radar
The Yuma radar (KYUX), 141 km from the middle of the area, began a volume at 20:56 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.
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 2:28 PM MST | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 26, 3:03 PM MST | Flash Flood Warning | PSR | Riverside, San Bernardino | 117 min |
| Aug 26, 3:15 PM MST | Severe Thunderstorm Warning | VEF | San Bernardino | 60 min |
| Aug 26, 4:06 PM MST | Severe Thunderstorm Warning | PSR | Riverside | 54 min |
| Aug 26, 5:24 PM MST | Flash Flood Warning | VEF | San Bernardino | 2 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Yuma Intl Airpor, AZ (KYUM), launched 12:00Z, 8.9 hours before the alert went out and 128 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
- 111 J/kg
- Mixed-layer CIN
- -261 J/kg
- Mixed-layer LCL
- 2175 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 12:26 PM MST | Mesoscale Discussion | SPC | La Paz | 2 hr |
Nearby
Severe Thunderstorm Watches in California, 2003Severe Thunderstorm Watches in Arizona, 2003Every severe thunderstorm watch in 2003
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.