Alert archive / Idaho / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS Missoula, MT

July 19, 2011Idaho County, Idaho

NWS Missoula, MT issued this severe thunderstorm warning at Jul 19, 2011, 3:24 PM PDT for Idaho County, Idaho. It was in force for 37 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 19, 2011, 3:24 PM PDT (22:24 UTC)
Expired: Jul 19, 2011, 4:01 PM PDT
In force: 37 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon

County Idaho County, ID

The radar

The Missoula radar (KMSX), 70 km from the middle of the area, began a volume at 22:24 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 10.4 hours before the alert went out and 193 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: 1818 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 219 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.

917 
WUUS55 KMSO 192224
SVRMSO
IDC049-192315-
/O.NEW.KMSO.SV.W.0009.110719T2224Z-110719T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
324 PM PDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN IDAHO COUNTY IN CENTRAL IDAHO...

* UNTIL 415 PM PDT.

* AT 318 PM PDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE. 
  THIS STORM WAS LOCATED 24 MILES SOUTH OF POWELL...OR ABOUT 29 MILES
  WEST OF HAMILTON...AND WAS MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...POWELL AND LOLO PASS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM. DAMAGING WINDS 
ARE POSSIBLE...ALONG WITH FREQUENT LIGHTNING AND VERY HEAVY RAIN. 
FOR YOUR PROTECTION...GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU 
ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA.

&&

LAT...LON 4662 11471 4665 11453 4663 11446 4666 11444
      4667 11434 4661 11432 4659 11435 4651 11435
      4650 11441 4644 11438 4613 11473 4624 11493
TIME...MOT...LOC 2223Z 219DEG 29KT 4626 11473

$$

2 follow-up statements

103 
WWUS55 KMSO 192243
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
443 PM MDT TUE JUL 19 2011

IDC049-192315-
/O.CON.KMSO.SV.W.0009.000000T0000Z-110719T2315Z/
IDAHO ID-
343 PM PDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM PDT
FOR NORTHEASTERN IDAHO COUNTY...

* AT 336 PM PDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED 17 MILES SOUTH OF POWELL...OR ABOUT 23 MILES
  WEST OF HAMILTON...AND WAS MOVING NORTHEAST AT 35 MPH.

LAT...LON 4659 11474 4662 11471 4665 11453 4663 11446
      4666 11444 4667 11434 4661 11432 4659 11435
      4651 11435 4650 11441 4644 11438 4624 11462
      4644 11482
TIME...MOT...LOC 2243Z 219DEG 29KT 4638 11458

$$

284 
WWUS55 KMSO 192301
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
501 PM MDT TUE JUL 19 2011

IDC049-192311-
/O.CAN.KMSO.SV.W.0009.000000T0000Z-110719T2315Z/
IDAHO ID-
401 PM PDT TUE JUL 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN IDAHO COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS MOVED NORTHEAST OUT OF THE REGION. THEREFORE 
THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. 

LAT...LON 4659 11474 4662 11471 4665 11453 4663 11446
      4666 11444 4667 11434 4661 11432 4659 11435
      4651 11435 4650 11441 4644 11438 4624 11462
      4644 11482
TIME...MOT...LOC 2301Z 219DEG 29KT 4649 11444

$$
MEAD

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 1:57 PM PDT	Special Weather Statement	MSO	Clearwater	48 min
Jul 19, 2:38 PM PDT	Wind Advisory	MSO	Lemhi	5 hr
Jul 19, 3:17 PM PDT	Areal Flood Advisory	MSO	Idaho	3 hr

Nearby

Severe Thunderstorm Warnings in Idaho, 2011 Every severe thunderstorm warning in 2011

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.