Alert archive / Idaho / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS Spokane, WA

August 31, 2007Kootenai County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Aug 31, 2007, 7:36 PM PDT for Kootenai County, Idaho. It was in force for 39 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
Aug 31, 2007, 7:36 PM PDT (02:36 UTC)
Expired
Aug 31, 2007, 8:15 PM PDT
In force
39 min
Issued by
NWS Spokane, WA
Area
Counties, with a storm outline in the text

County Kootenai County, ID

The radar

The Spokane radar (KOTX), 80 km from the middle of the area, began a volume at 02:39 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.

IssuedProductOfficeLasted
Aug 31, 2:02 PM PDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 2.6 hours before the alert went out and 19 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-pSkew-T log-p diagram, Spokane, WA at 00:00Z on 2007-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 352 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 00:00Z on 2007-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
352 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
2199 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

000 
WUUS56 KOTX 010237
SVROTX
IDC055-010315-
/O.NEW.KOTX.SV.W.0021.070901T0236Z-070901T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
736 PM PDT FRI AUG 31 2007

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN KOOTENAI COUNTY IN THE PANHANDLE OF IDAHO...
    THIS INCLUDES THE CITIES OF...HAYDEN...DALTON GARDENS...COEUR
    DALENE...

* UNTIL 815 PM PDT

* AT 734 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED NEAR COEUR DALENE... 
AND MOVING NORTHEAST AT 40 MPH. WINDS OF 50 MPH AND QUARTER SIZE 
HAIL IS EXPECTED.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   CHILCO BY 745 PM PDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND SOUTHEASTERN
WASHINGTON.

LAT...LON 4795 11651 4790 11650 4789 11649 4788 11646
      4768 11633 4761 11684 4777 11697
TIME...MOT...LOC 0236Z 245DEG 36KT 4773 11677

$$
LN
2 follow-up statements
000 
WWUS56 KOTX 010256
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
756 PM PDT FRI AUG 31 2007

IDC055-010315-
/O.CON.KOTX.SV.W.0021.000000T0000Z-070901T0315Z/
KOOTENAI ID-
756 PM PDT FRI AUG 31 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM PDT
FOR NORTHERN KOOTENAI COUNTY...

AT 754 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 EAST OF CHILCO...OR ABOUT 12 MILES EAST OF DALTON
GARDENS...MOVING NORTHEAST AT 40 MPH.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND SOUTHEASTERN
WASHINGTON.

LAT...LON 4795 11651 4790 11650 4789 11649 4788 11646
      4768 11633 4761 11684 4777 11697
TIME...MOT...LOC 0256Z 245DEG 36KT 4781 11650

$$
LN
000 
WWUS56 KOTX 010310
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
808 PM PDT FRI AUG 31 2007

IDC055-010318-
/O.EXP.KOTX.SV.W.0021.000000T0000Z-070901T0315Z/
KOOTENAI ID-
808 PM PDT FRI AUG 31 2007

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN KOOTENAI COUNTY
EXPIRES AT 815 PM PDT...

THE SEVERE THUNDERSTORM HAS MOVED OUT OF THE AREA AND DECREASED IN 
INTENSITY. THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN 
ALLOWED TO EXPIRE. 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM PDT FRIDAY
EVENING FOR THE PANHANDLE AND NORTH CENTRAL IDAHO AND SOUTHEASTERN
WASHINGTON.

LAT...LON 4795 11651 4790 11650 4789 11649 4788 11646
      4768 11633 4761 11684 4777 11697
TIME...MOT...LOC 0308Z 245DEG 36KT 4786 11634

$$
LN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 31, 8:05 PM PDTSevere Thunderstorm WarningOTXBonner40 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2007Every severe thunderstorm warning in 2007

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.