Alert archive / Idaho / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 13, NWS Spokane, WA

May 31, 2015Lewis County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at May 31, 2015, 8:41 PM PDT for Lewis County, Idaho. It was in force for 49 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: May 31, 2015, 8:41 PM PDT (03:41 UTC)
Expired: May 31, 2015, 9:30 PM PDT
In force: 49 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

County Lewis County, ID

The radar

The Spokane radar (KOTX), 192 km from the middle of the area, began a volume at 03:41 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, 3.7 hours before the alert went out and 162 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3012 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

110 
WUUS56 KOTX 010341
SVROTX
IDC061-010430-
/O.NEW.KOTX.SV.W.0013.150601T0341Z-150601T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
841 PM PDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL LEWIS COUNTY IN NORTH CENTRAL IDAHO...

* UNTIL 930 PM PDT

* AT 835 PM PDT...THE PUBLIC REPORTED A SEVERE THUNDERSTORM PRODUCING
  QUARTER SIZE HAIL NEAR CRAIGMONT. THIS STORM WAS LOCATED NEAR CRAIGMONT...OR 17
  MILES WEST OF KAMIAH...AND MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  KAMIAH...CRAIGMONT...NEZPERCE AND MOHLER. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 4617 11630 4619 11633 4620 11645 4629 11651
      4641 11622 4641 11619 4630 11613 4626 11608
      4623 11601 4621 11605 4621 11615 4615 11620
TIME...MOT...LOC 0339Z 244DEG 22KT 4619 11640 

$$

BZ

1 follow-up statement

470 
WWUS56 KOTX 010440
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
940 PM PDT SUN MAY 31 2015

IDC061-010448-
/O.EXP.KOTX.SV.W.0013.000000T0000Z-150601T0430Z/
LEWIS ID-
940 PM PDT SUN MAY 31 2015

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LEWIS COUNTY HAS
EXPIRED...
        
THE STORM WHICH PROMPTED THE WARNING FOR QUARTER SIZED HAIL NEAR 
CRAIGMONT HAS MOVED EAST OUT OF THE AREA. THEREFORE THE WARNING HAS 
BEEN ALLOWED TO EXPIRE.

LAT...LON 4617 11630 4619 11633 4620 11645 4629 11651
      4641 11622 4641 11619 4630 11613 4626 11608
      4623 11601 4621 11605 4621 11615 4615 11620
TIME...MOT...LOC 0437Z 244DEG 22KT 4619 11640 

$$

BZ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 5:11 PM PDT	Special Weather Statement	OTX	Lewis	64 min
May 31, 5:17 PM PDT	Severe Thunderstorm Warning	OTX	Lewis, Nez Perce	42 min
May 31, 9:33 PM PDT	Severe Thunderstorm Warning	OTX	Nez Perce	57 min
May 31, 10:33 PM PDT	Severe Thunderstorm Warning	OTX	Nez Perce	42 min
May 31, 11:35 PM PDT	Special Weather Statement	OTX	Latah	25 min
Jun 1, 6:32 AM PDT	Flash Flood Watch	OTX	Benewah, Bonner, Boundary, Kootenai, Latah, Shoshone	22 hr

Nearby

Severe Thunderstorm Warnings in Idaho, 2015 Every severe thunderstorm warning in 2015

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.