Alert archive / Oregon / Severe Thunderstorm Watches in 2019

Severe Thunderstorm Watch 565

August 9, 20198 counties in Oregon

The Storm Prediction Center issued this severe thunderstorm watch at Aug 9, 2019, 2:36 PM PDT for 8 counties in Oregon. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 9, 2019, 2:36 PM PDT (21:36 UTC)
Expired
Aug 9, 2019, 7:28 PM PDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt

Counties Crook County, OR, Deschutes County, OR, Douglas County, OR, Jackson County, OR, Jefferson County, OR, Klamath County, OR, Lane County, OR, Wheeler County, OR

The radar

The Medford radar (KMAX), 120 km from the middle of the area, began a volume at 21:36 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
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
60%
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
20%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 9, 3:42 PM PDTSevere Thunderstorm WarningMFRDouglas, Jackson, Klamath33 min
Aug 9, 4:24 PM PDTSevere Thunderstorm WarningPDTCrook, Jefferson, Wheeler51 min
Aug 9, 4:31 PM PDTSevere Thunderstorm WarningPDTDeschutes, Jefferson44 min
Aug 9, 5:20 PM PDTSevere Thunderstorm WarningPDTJefferson40 min
Aug 9, 6:22 PM PDTSevere Thunderstorm WarningPDTGilliam, Grant, Morrow, Wheeler53 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 9.6 hours before the alert went out and 96 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.

Skew-T log-pSkew-T log-p diagram, Medford/Jackson, OR at 12:00Z on 2019-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 12:00Z on 2019-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
871 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 1:00 PM PDTMesoscale DiscussionSPCBaker, Clackamas, Crook, Deschutes, Douglas, Gilliam and 15 more2 hr

Nearby

Severe Thunderstorm Watches in Oregon, 2019Every severe thunderstorm watch in 2019

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.