Alert archive / Idaho / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 435

July 23, 201410 counties in Idaho; 8 counties in Montana; 8 counties in Washington

The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2014, 3:09 PM PDT for 10 counties in Idaho; 8 counties in Montana; 8 counties in Washington. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 23, 2014, 3:09 PM PDT (22:09 UTC)
Expired
Jul 23, 2014, 7:46 PM PDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 26 counties

Benewah County, ID, Bonner County, ID, Boundary County, ID, Clearwater County, ID, Idaho County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Flathead County, MT, Granite County, MT, Lake County, MT, Lincoln County, MT, Mineral County, MT, Missoula County, MT, Ravalli County, MT, Sanders County, MT, Asotin County, WA, Ferry County, WA, Garfield County, WA, Lincoln County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 89 km from the middle of the area, began a volume at 22:09 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
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 23, 3:13 PM PDTSevere Thunderstorm WarningOTXFerry, Stevens47 min
Jul 23, 3:22 PM PDTSevere Thunderstorm WarningOTXBenewah, Latah38 min
Jul 23, 3:37 PM PDTSevere Thunderstorm WarningOTXLatah38 min
Jul 23, 3:59 PM PDTSevere Thunderstorm WarningOTXStevens31 min
Jul 23, 4:00 PM PDTSevere Thunderstorm WarningOTXLincoln, Spokane, Stevens45 min
Jul 23, 4:01 PM PDTSevere Thunderstorm WarningOTXBenewah, Kootenai, Latah, Shoshone44 min
Jul 23, 4:13 PM PDTSevere Thunderstorm WarningOTXBenewah, Latah, Shoshone19 min
Jul 23, 4:22 PM PDTSevere Thunderstorm WarningOTXBonner, Boundary53 min
Jul 23, 4:26 PM PDTSevere Thunderstorm WarningOTXDouglas, Ferry, Grant, Lincoln, Okanogan, Stevens49 min
Jul 23, 4:40 PM PDTSevere Thunderstorm WarningOTXLincoln35 min
Jul 23, 4:43 PM PDTSevere Thunderstorm WarningOTXKootenai, Shoshone47 min
Jul 23, 4:58 PM PDTSevere Thunderstorm WarningOTXFerry, Okanogan77 min
Jul 23, 5:09 PM PDTSevere Thunderstorm WarningMSOLincoln, Sanders36 min
Jul 23, 5:10 PM PDTSevere Thunderstorm WarningOTXBonner, Boundary, Shoshone80 min
Jul 23, 5:43 PM PDTSevere Thunderstorm WarningMSOLincoln47 min
Jul 23, 6:43 PM PDTSevere Thunderstorm WarningMSOGranite, Powell29 min
Jul 23, 7:11 PM PDTSevere Thunderstorm WarningMSOGranite, Powell23 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

Spokane, WA (KOTX), launched 12:00Z, 10.2 hours before the alert went out and 3 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, Spokane, WA at 12:00Z on 2014-07-23Temperature 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, Spokane, WA at 12:00Z on 2014-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.19395878Sfc1 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
1236 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
100 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
Jul 23, 1:35 PM PDTMesoscale DiscussionSPCBenewah, Bonner, Clearwater, Idaho, Kootenai, Latah and 3 more55 min
Jul 22, 5:21 PM PDTMesoscale DiscussionSPCCarter, Powder River114 min
Jul 22, 7:17 PM PDTMesoscale DiscussionSPCCarter, Powder River88 min

Nearby

Severe Thunderstorm Watches in Idaho, 2014Severe Thunderstorm Watches in Montana, 2014Severe Thunderstorm Watches in Washington, 2014Every severe thunderstorm watch in 2014

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.