Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Spokane, WA

July 9, 2012Boundary County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Jul 9, 2012, 2:09 PM PDT for Boundary County, Idaho. It was in force for 16 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 9, 2012, 2:09 PM PDT (21:09 UTC)
Expired: Jul 9, 2012, 2:25 PM PDT
In force: 16 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

County Boundary County, ID

The radar

The Spokane radar (KOTX), 170 km from the middle of the area, began a volume at 21:12 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 12:00Z, 9.2 hours before the alert went out and 143 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: 179 J/kg
Mixed-layer CIN: -513 J/kg
Mixed-layer LCL: 2755 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 48 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.

451 
WUUS56 KOTX 092109
SVROTX
IDC021-092200-
/O.NEW.KOTX.SV.W.0021.120709T2109Z-120709T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
209 PM PDT MON JUL 9 2012

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL BOUNDARY COUNTY IN THE PANHANDLE OF IDAHO...

* UNTIL 300 PM PDT/400 PM MDT/

* AT 204 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR PORTHILL...OR 22 MILES NORTHWEST OF BONNERS
  FERRY. THIS STORM WAS NEARLY STATIONARY.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  PORTHILL

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4900 11633 4891 11646 4894 11653 4900 11651
      4901 11649 4901 11634
TIME...MOT...LOC 2108Z 180DEG 0KT 4896 11657

$$

SB

1 follow-up statement

062 
WWUS56 KOTX 092125
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
225 PM PDT MON JUL 9 2012

IDC021-092135-
/O.CAN.KOTX.SV.W.0021.000000T0000Z-120709T2200Z/
BOUNDARY ID-
225 PM PDT MON JUL 9 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BOUNDARY COUNTY
IS CANCELLED...

DOPPLER RADAR INDICATED THE STORM WAS NO LONGER SEVERE AND THE
WARNING WAS ALLOWED TO EXPIRE. .

LAT...LON 4900 11633 4891 11646 4894 11653 4900 11651
      4901 11649 4901 11634
TIME...MOT...LOC 2125Z 180DEG 0KT 4896 11657

$$

SB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 1:41 PM PDT	Special Weather Statement	OTX	Boundary	34 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.