Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 38, NWS Spokane, WA

July 20, 2012Latah County, Nez Perce County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Jul 20, 2012, 2:07 PM PDT for Latah County, Nez Perce County, Idaho. It was in force for 38 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: Jul 20, 2012, 2:07 PM PDT (21:07 UTC)
Expired: Jul 20, 2012, 2:45 PM PDT
In force: 38 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

Counties Latah County, ID, Nez Perce County, ID

The radar

The Spokane radar (KOTX), 146 km from the middle of the area, began a volume at 21:07 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 11:38 AM PDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 9.1 hours before the alert went out and 122 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: 2619 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 66 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.

575 
WUUS56 KOTX 202107
SVROTX
IDC057-069-202145-
/O.NEW.KOTX.SV.W.0038.120720T2107Z-120720T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
207 PM PDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEZ PERCE COUNTY IN NORTH CENTRAL IDAHO...
  EASTERN LATAH COUNTY IN THE PANHANDLE OF IDAHO...

* UNTIL 245 PM PDT

* AT 203 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6
  MILES WEST OF GIFFORD...OR 15 MILES EAST OF LEWISTON...AND MOVING
  NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LENORE...JULIAETTA...KENDRICK...SOUTHWICK...SPALDING...HELMER...
  DEARY AND BOVILL

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

&&

LAT...LON 4644 11682 4696 11662 4689 11632 4663 11632
      4662 11633 4662 11644 4650 11643 4635 11660
TIME...MOT...LOC 2107Z 204DEG 30KT 4648 11667

$$

JCOTE

1 follow-up statement

023 
WWUS56 KOTX 202134
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
234 PM PDT FRI JUL 20 2012

IDC069-202144-
/O.CAN.KOTX.SV.W.0038.000000T0000Z-120720T2145Z/
NEZ PERCE ID-
234 PM PDT FRI JUL 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEZ PERCE COUNTY
IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

LAT...LON 4663 11646 4663 11649 4676 11668 4696 11662
      4689 11632 4663 11632 4662 11633 4662 11645
TIME...MOT...LOC 2134Z 204DEG 30KT 4669 11653

$$

IDC057-202145-
/O.CON.KOTX.SV.W.0038.000000T0000Z-120720T2145Z/
LATAH ID-
234 PM PDT FRI JUL 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM PDT
FOR EASTERN LATAH COUNTY...

AT 229 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 11 MILES SOUTH OF DEARY...OR 19 MILES NORTHWEST OF OROFINO...
MOVING NORTHEAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HELMER
AND BOVILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND EASTERN
WASHINGTON.

&&

LAT...LON 4663 11646 4663 11649 4676 11668 4696 11662
      4689 11632 4663 11632 4662 11633 4662 11645
TIME...MOT...LOC 2134Z 204DEG 30KT 4669 11653

$$

JCOTE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:09 PM PDT	Special Weather Statement	OTX	Nez Perce	51 min
Jul 20, 12:39 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	51 min
Jul 20, 12:57 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	48 min
Jul 20, 1:04 PM PDT	Areal Flood Advisory	OTX	Nez Perce	4 hr
Jul 20, 1:18 PM PDT	Severe Thunderstorm Warning	OTX	Benewah, Latah, Nez Perce, Shoshone	42 min
Jul 20, 2:00 PM PDT	Severe Thunderstorm Warning	OTX	Benewah, Latah, Shoshone	45 min
Jul 20, 2:21 PM PDT	Severe Thunderstorm Warning	OTX	Bonner, Kootenai	39 min
Jul 20, 2:41 PM PDT	Severe Thunderstorm Warning	OTX	Kootenai, Shoshone	49 min
Jul 20, 2:58 PM PDT	Severe Thunderstorm Warning	OTX	Shoshone	47 min
Jul 20, 3:17 PM PDT	Severe Thunderstorm Warning	OTX	Kootenai	43 min
Jul 20, 3:18 PM PDT	Areal Flood Advisory	OTX	Latah	117 min
Jul 20, 3:20 PM PDT	Severe Thunderstorm Warning	OTX	Benewah, Kootenai, Latah	40 min
Jul 20, 3:35 PM PDT	Areal Flood Warning	OTX	Bonner, Boundary, Kootenai, Shoshone	4 hr
Jul 20, 3:37 PM PDT	Severe Thunderstorm Warning	OTX	Bonner, Boundary	53 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2012 Every severe thunderstorm warning in 2012

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.