Alert archive / Oregon / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 303
The Storm Prediction Center issued this severe thunderstorm watch at May 14, 2011, 12:28 PM PDT for 11 counties in Oregon. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 14, 2011, 12:28 PM PDT (19:28 UTC)
- Expired
- May 14, 2011, 7:00 PM PDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Baker County, OR, Crook County, OR, Gilliam County, OR, Grant County, OR, Harney County, OR, Malheur County, OR, Morrow County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wheeler County, OR
The radar
The Pendleton radar (KPDT), 144 km from the middle of the area, began a volume at 19:31 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
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 12:45 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla | 60 min |
| May 14, 12:57 PM PDT | Severe Thunderstorm Warning | BOI | Harney | 63 min |
| May 14, 1:55 PM PDT | Severe Thunderstorm Warning | BOI | Harney | 35 min |
| May 14, 1:59 PM PDT | Severe Thunderstorm Warning | BOI | Harney | 61 min |
| May 14, 2:18 PM PDT | Flash Flood Warning | PDT | Morrow | 87 min |
| May 14, 4:22 PM PDT | Flash Flood Warning | PDT | Grant, Morrow, Umatilla | 5 hr |
| May 14, 5:15 PM PDT | Flash Flood Warning | PDT | Morrow, Umatilla | 3 hr |
| May 14, 5:18 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla | 57 min |
| May 14, 6:06 PM PDT | Severe Thunderstorm Warning | PDT | Morrow, Umatilla | 54 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
Boise Airport, ID (KBOI), launched 12:00Z, 7.5 hours before the alert went out and 226 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2377 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 18 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 14, 11:25 AM PDT | Mesoscale Discussion | SPC | Canyon, Payette, Washington | 65 min |
| May 14, 3:53 PM PDT | Mesoscale Discussion | SPC | Ada, Canyon, Gem, Owyhee, Payette, Washington | 67 min |
Nearby
Severe Thunderstorm Watches in Oregon, 2011Every severe thunderstorm watch in 2011
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.