Alert archive / Idaho / Tornado Warnings in 2018

Tornado Warning 2, NWS Pocatello, ID

April 7, 2018Bingham County, Bonneville County, Idaho

NWS Pocatello, ID issued this tornado warning at Apr 7, 2018, 6:30 PM MDT for Bingham County, Bonneville County, Idaho. It was in force for 30 min. 1 report 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: Apr 7, 2018, 6:30 PM MDT (00:30 UTC)
Expired: Apr 7, 2018, 7:00 PM MDT
In force: 30 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Bingham County, ID, Bonneville County, ID

The radar

The Pocatello radar (KSFX), 30 km from the middle of the area, began a volume at 00:31 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
Apr 7, 6:30 PM MDT	TORNADO	3 E Taber, ID	SOCIAL MEDIA REPORT OF DEBRIS SWIRL - TUMBLEWEEDS AND TREE LIMBS LOFTED BRIEFLY IN THE AREA OF 1400 W AND US 26. BASED ON THIS REPORT, TORNADO WILL BE RATED A LOW END EF-0. TIME ESTIMATED BY RADAR.

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

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 0.5 hours before the alert went out and 290 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: 1264 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

413 
WFUS55 KPIH 080030
TORPIH
IDC011-019-080100-
/O.NEW.KPIH.TO.W.0002.180408T0030Z-180408T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pocatello ID
630 PM MDT SAT APR 7 2018

The National Weather Service in Pocatello has issued a

* Tornado Warning for...
  Western Bonneville County in southeastern Idaho...
  Central Bingham County in southeastern Idaho...

* Until 700 PM MDT
    
* At 629 PM MDT, a severe thunderstorm capable of producing a tornado
  was located over Taber or 15 miles northwest of Blackfoot, moving
  east at 40 mph.

  HAZARD...Tornado and quarter size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This tornadic thunderstorm will remain over mainly rural areas of
  western Bonneville and central Bingham Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4327 11265 4340 11270 4349 11234 4331 11221
TIME...MOT...LOC 0029Z 257DEG 33KT 4333 11260 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

AD/Huston

1 follow-up statement

206 
WWUS55 KPIH 080052
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
652 PM MDT SAT APR 7 2018

IDC011-019-080101-
/O.EXP.KPIH.TO.W.0002.000000T0000Z-180408T0100Z/
Bonneville ID-Bingham ID-
652 PM MDT SAT APR 7 2018

...THE TORNADO WARNING FOR WESTERN BONNEVILLE AND CENTRAL BINGHAM
COUNTIES WILL EXPIRE AT 700 PM MDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and 
a Severe Thunderstorm Warning remains in effect for the area. Seek a 
sturdy shelter away from windows until the storm has passed.

LAT...LON 4327 11265 4340 11270 4349 11234 4331 11221
TIME...MOT...LOC 0051Z 257DEG 33KT 4337 11234 

$$

AD/Huston

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 6:07 PM MDT	Tornado Warning	PIH	Bingham, Bonneville, Butte	23 min
Apr 7, 6:50 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Jefferson, Madison	40 min
Apr 7, 7:26 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Fremont, Jefferson, Madison, Teton	20 min
Apr 7, 7:32 PM MDT	Special Weather Statement	PIH	Bannock, Caribou, Franklin, Oneida	58 min
Apr 7, 7:48 PM MDT	Special Weather Statement	PIH	Madison, Teton	42 min
Apr 7, 9:12 PM MDT	Special Weather Statement	PIH	Bear Lake	18 min
Apr 8, 2:08 AM MDT	Areal Flood Warning	PIH	Clark	18 hr
Apr 8, 2:19 AM MDT	Wind Advisory	PIH		17 hr

Nearby

Tornado Warnings in Idaho, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.