Alert archive / Idaho / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 21, NWS Pocatello, ID

July 8, 2017Power County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 8, 2017, 3:56 PM MDT for Power County, Idaho. It was in force for 49 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 8, 2017, 3:56 PM MDT (21:56 UTC)
Expired: Jul 8, 2017, 4:45 PM MDT
In force: 49 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Power County, ID

The radar

The Pocatello radar (KSFX), 61 km from the middle of the area, began a volume at 21:56 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 9.9 hours before the alert went out and 218 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: 15 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 3505 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 37 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

974 
WUUS55 KPIH 082156
SVRPIH
IDC077-082245-
/O.NEW.KPIH.SV.W.0021.170708T2156Z-170708T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
356 PM MDT SAT JUL 8 2017

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Central Power County in southeastern Idaho...

* Until 445 PM MDT

* At 356 PM MDT, a severe thunderstorm was located over Rockland or
  12 miles south of Neeley, moving north at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Rockland and Massacre Rocks. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4252 11287 4252 11297 4269 11302 4268 11281
TIME...MOT...LOC 2156Z 188DEG 8KT 4256 11292 

HAIL...1.00IN
WIND...60MPH
 
$$

Hedges

1 follow-up statement

874 
WWUS55 KPIH 082236
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
436 PM MDT SAT JUL 8 2017

IDC077-082245-
/O.EXP.KPIH.SV.W.0021.000000T0000Z-170708T2245Z/
Power ID-
436 PM MDT SAT JUL 8 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL POWER COUNTY WILL
EXPIRE AT 445 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.

LAT...LON 4252 11287 4252 11297 4269 11302 4268 11281
TIME...MOT...LOC 2235Z 188DEG 8KT 4264 11290 

$$

Hedges

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 8, 1:30 PM MDT	Special Weather Statement	PIH	Cassia	45 min
Jul 8, 1:42 PM MDT	Special Weather Statement	PIH	Cassia	63 min
Jul 8, 2:03 PM MDT	Special Weather Statement	PIH	Bear Lake	57 min
Jul 8, 2:23 PM MDT	Special Weather Statement	PIH	Oneida	52 min
Jul 8, 2:40 PM MDT	Special Weather Statement	PIH	Cassia	50 min
Jul 8, 3:25 PM MDT	Special Weather Statement	PIH	Oneida	50 min
Jul 8, 4:09 PM MDT	Special Weather Statement	PIH	Power	51 min
Jul 8, 4:22 PM MDT	Special Weather Statement	PIH	Power	38 min
Jul 8, 4:40 PM MDT	Special Weather Statement	PIH	Bear Lake	65 min
Jul 8, 5:43 PM MDT	Special Weather Statement	PIH	Bear Lake	62 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2017 Every severe thunderstorm warning in 2017

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.