Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Spokane, WA

July 20, 2012Bonner County, Kootenai County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Jul 20, 2012, 2:21 PM PDT for Bonner County, Kootenai County, Idaho. It was in force for 39 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 20, 2012, 2:21 PM PDT (21:21 UTC)
Expired: Jul 20, 2012, 3:00 PM PDT
In force: 39 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

Counties Bonner County, ID, Kootenai County, ID

The radar

The Spokane radar (KOTX), 83 km from the middle of the area, began a volume at 21:24 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 was reported inside it

Time	Report	Where	Remark
Jul 20, 2:36 PM PDT	TSTM WND DMG	Nnw Rose Lake, ID	TREE DOWN ON POWER LINE.
Jul 20, 2:59 PM PDT	TSTM WND DMG	3 Nne Rose Lake, ID	LARGE TREE ON HIGHWAY 3 NEAR I-90 INTERCHANGE BLOCKING TRAFFIC.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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, 9.4 hours before the alert went out and 10 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.

487 
WUUS56 KOTX 202121
SVROTX
IDC017-055-202200-
/O.NEW.KOTX.SV.W.0039.120720T2121Z-120720T2200Z/

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

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTH CENTRAL BONNER COUNTY IN THE PANHANDLE OF IDAHO...
  EASTERN KOOTENAI COUNTY IN THE PANHANDLE OF IDAHO...

* UNTIL 300 PM PDT

* AT 216 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  MEDIMONT...OR 14 MILES SOUTHEAST OF COEUR D'ALENE...AND MOVING
  NORTH AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROSE
  LAKE...BEAUTY CREEK CAMPGROUND...WOLF CREEK CAMPGROUND...FOURTH OF
  JULY PASS...FERNAN LAKE VILLAGE...DALTON GARDENS...HAYDEN LAKE...
  CHILCO AND ATHOL

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF ON OR NEAR LAKE COEUR D'ALENE...GET OUT OF THE WATER AND MOVE INDOORS 
OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES 
FROM THE PARENT THUNDERSTORM. MOVE TO SAFE SHELTER NOW. DON'T BE 
CAUGHT ON THE WATER IN A THUNDERSTORM!

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 4741 11647 4748 11682 4796 11672 4791 11632
      4786 11632
TIME...MOT...LOC 2121Z 196DEG 29KT 4755 11665

$$

JW

1 follow-up statement

362 
WWUS56 KOTX 202151
SVSOTX

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

IDC017-055-202200-
/O.CON.KOTX.SV.W.0039.000000T0000Z-120720T2200Z/
BONNER ID-KOOTENAI ID-
251 PM PDT FRI JUL 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM PDT
FOR NORTHEASTERN KOOTENAI AND EXTREME SOUTH CENTRAL BONNER
COUNTIES...

AT 242 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 17 MILES SOUTHEAST OF ATHOL...OR 13 MILES EAST OF COEUR
D'ALENE...MOVING NORTHEAST AT 40 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTIES.

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 4764 11639 4774 11668 4796 11672 4791 11632
      4786 11632
TIME...MOT...LOC 2151Z 220DEG 60KT 4785 11637

$$

JW

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, 2:07 PM PDT	Severe Thunderstorm Warning	OTX	Latah, Nez Perce	38 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.