Alert archive / Idaho / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 13, NWS Spokane, WA

June 12, 2020Nez Perce County, Idaho; Asotin County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at Jun 12, 2020, 7:20 PM PDT for Nez Perce County, Idaho; Asotin County, Washington. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 12, 2020, 7:20 PM PDT (02:20 UTC)
Expired: Jun 12, 2020, 7:45 PM PDT
In force: 25 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Nez Perce County, ID, Asotin County, WA

The radar

The Pendleton radar (KPDT), 148 km from the middle of the area, began a volume at 02:22 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 2.3 hours before the alert went out and 170 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 110 J/kg
Mixed-layer CIN: -240 J/kg
Mixed-layer LCL: 1642 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

820 
WUUS56 KOTX 130220
SVROTX
IDC069-WAC003-130245-
/O.NEW.KOTX.SV.W.0013.200613T0220Z-200613T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Spokane WA
720 PM PDT Fri Jun 12 2020

The National Weather Service in Spokane has issued a

* Severe Thunderstorm Warning for...
  Western Nez Perce County in north central Idaho...
  Central Asotin County in southeastern Washington...

* Until 745 PM PDT.

* At 720 PM PDT, a severe thunderstorm was located 13 miles south of
  Clarkston Heights-Vineland, or 15 miles southwest of Lewiston,
  moving north at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Asotin and Cloverland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4614 11710 4618 11730 4636 11726 4630 11711
      4636 11700 4630 11692
TIME...MOT...LOC 0220Z 198DEG 27KT 4620 11716 

HAIL...1.00IN
WIND...60MPH
 
$$

AK

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 12, 6:40 PM PDT	Special Weather Statement	OTX	Latah	50 min
Jun 12, 7:14 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	46 min
Jun 12, 7:23 PM PDT	Special Weather Statement	OTX	Benewah	52 min
Jun 12, 7:48 PM PDT	Special Weather Statement	OTX	Latah	42 min
Jun 12, 8:35 PM PDT	Special Weather Statement	OTX	Shoshone	40 min
Jun 12, 9:14 PM PDT	Special Weather Statement	OTX	Shoshone	31 min
Jun 12, 5:43 PM PDT	Special Weather Statement	OTX	Ferry	32 min
Jun 12, 6:22 PM PDT	Special Weather Statement	OTX	Asotin	38 min
Jun 12, 6:28 PM PDT	Severe Thunderstorm Warning	OTX	Asotin, Garfield, Whitman	47 min
Jun 12, 6:56 PM PDT	Severe Thunderstorm Warning	OTX	Asotin, Garfield	22 min
Jun 12, 7:32 PM PDT	Special Weather Statement	OTX	Adams	43 min
Jun 12, 7:53 PM PDT	Special Weather Statement	OTX	Whitman	37 min
Jun 12, 9:31 PM PDT	Special Weather Statement	OTX	Asotin	44 min
Jun 12, 11:00 PM PDT	Special Weather Statement	OTX	Garfield	45 min
Jun 12, 11:02 PM PDT	Special Weather Statement	OTX	Stevens	43 min
Jun 12, 11:53 PM PDT	Special Weather Statement	OTX	Pend Oreille	52 min
Jun 13, 4:12 AM PDT	Special Weather Statement	OTX	Lincoln	48 min
Jun 13, 4:36 AM PDT	Special Weather Statement	OTX	Spokane	39 min
Jun 13, 5:24 AM PDT	Special Weather Statement	OTX	Spokane	51 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2020 Severe Thunderstorm Warnings in Washington, 2020 Every severe thunderstorm warning in 2020

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.