Alert archive / Idaho / Tornado Warnings in 2018

Tornado Warning 9, NWS Pocatello, ID

May 31, 2018Bingham County, Bonneville County, Jefferson County, Idaho

NWS Pocatello, ID issued this tornado warning at May 31, 2018, 4:31 PM MDT for Bingham County, Bonneville County, Jefferson County, Idaho. It was in force for 29 min. 4 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: May 31, 2018, 4:31 PM MDT (22:31 UTC)
Expired: May 31, 2018, 5:00 PM MDT
In force: 29 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Bingham County, ID, Bonneville County, ID, Jefferson County, ID

The radar

The Pocatello radar (KSFX), 65 km from the middle of the area, began a volume at 22:35 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
May 31, 4:31 PM MDT	TORNADO	15 Ssw Mud Lake, ID	SPOTTER IN MUD LAKE LOOKING SSW APPROXIMATELY 15 MILES. ROPE TORNADO THAT QUICKLY DISSIPATED.
May 31, 4:45 PM MDT	HAIL 1	Nw Roberts, ID
May 31, 5:00 PM MDT	FUNNEL CLOUD	Roberts, ID	FUNNEL OBSERVED LOOKING SOUTH ON SOCIAL MEDIA. TIME ESTIMATED.
May 31, 5:10 PM MDT	HAIL 1	Roberts, ID	ACCOMPANIED WITH 50 MPH WINDS AS WELL.

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
May 31, 1:10 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.5 hours before the alert went out and 306 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: -332 J/kg
Mixed-layer LCL: 1253 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

230 
WFUS55 KPIH 312231
TORPIH
IDC011-019-051-312300-
/O.NEW.KPIH.TO.W.0009.180531T2231Z-180531T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pocatello ID
431 PM MDT THU MAY 31 2018

The National Weather Service in Pocatello has issued a

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

* Until 500 PM MDT

* At 429 PM MDT, a confirmed tornado was located 7 miles east of
  Southeast Inl or 16 miles south of Terreton, moving northeast at 50
  mph.

  HAZARD...Damaging tornado and quarter size hail. 

  SOURCE...NWS Employee confirmed tornado. 

  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. 
and trained spotter 
* The tornado will be near...
  Terreton around 450 PM MDT. 
  Hamer around 500 PM MDT. 

Other locations impacted by this tornadic thunderstorm include Sage
Junction and Kettle Butte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4344 11250 4358 11268 4400 11229 4378 11201
TIME...MOT...LOC 2229Z 217DEG 44KT 4359 11250 

TORNADO...OBSERVED
HAIL...1.00IN

$$

JKEYES

1 follow-up statement

312 
WWUS55 KPIH 312256
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
456 PM MDT THU MAY 31 2018

IDC011-019-051-312305-
/O.EXP.KPIH.TO.W.0009.000000T0000Z-180531T2300Z/
Jefferson ID-Bonneville ID-Bingham ID-
456 PM MDT THU MAY 31 2018

...THE TORNADO WARNING FOR WESTERN JEFFERSON...NORTHWESTERN
BONNEVILLE AND NORTHWESTERN BINGHAM COUNTIES WILL EXPIRE AT 500 PM
MDT...
    
The tornado threat has diminished and the Tornado Warning will be 
allowed to expire. However, large hail and damaging winds remain 
likely and a Severe Thunderstorm Warning remains in effect for the 
area until 530 PM MDT. 

A severe thunderstorm watch remains in effect until 800 PM MDT for
southeastern Idaho.


LAT...LON 4344 11250 4358 11268 4400 11229 4378 11201
TIME...MOT...LOC 2255Z 217DEG 44KT 4383 11225 

$$

JKEYES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 6:18 PM MDT	Special Weather Statement	PIH	Oneida, Power	57 min
May 30, 6:46 PM MDT	Special Weather Statement	PIH	Minidoka	44 min
May 30, 7:20 PM MDT	Special Weather Statement	PIH	Bannock	55 min
May 30, 7:24 PM MDT	Special Weather Statement	PIH	Bingham	51 min
May 30, 7:38 PM MDT	Special Weather Statement	PIH	Franklin	82 min
May 30, 8:19 PM MDT	Special Weather Statement	PIH	Blaine	56 min
May 30, 8:24 PM MDT	Special Weather Statement	PIH	Bonneville, Caribou	81 min
May 30, 8:32 PM MDT	Special Weather Statement	PIH	Bingham, Butte, Minidoka, Power	88 min
May 30, 8:37 PM MDT	Special Weather Statement	PIH	Bear Lake	83 min
May 30, 8:54 PM MDT	Special Weather Statement	PIH	Custer	81 min
May 30, 9:18 PM MDT	Special Weather Statement	PIH	Bonneville	42 min
May 31, 10:41 AM MDT	River Flood Watch	PIH	Bonneville	18 hr
May 31, 12:40 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Jefferson, Madison	35 min
May 31, 1:03 PM MDT	Tornado Warning	PIH	Bonneville, Jefferson, Madison, Teton	27 min
May 31, 1:16 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Jefferson, Madison	24 min
May 31, 1:27 PM MDT	Tornado Warning	PIH	Fremont, Jefferson, Madison, Teton	33 min
May 31, 1:42 PM MDT	Special Weather Statement	PIH	Lincoln	33 min
May 31, 1:44 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Fremont, Jefferson, Madison	46 min
May 31, 1:58 PM MDT	Tornado Warning	PIH	Fremont, Madison, Teton	32 min
May 31, 2:08 PM MDT	Special Weather Statement	PIH	Lincoln	52 min
May 31, 2:13 PM MDT	Special Weather Statement	PIH	Bonneville	32 min
May 31, 2:18 PM MDT	Special Weather Statement	PIH	Minidoka	42 min
May 31, 2:33 PM MDT	Severe Thunderstorm Warning	PIH	Lincoln	31 min
May 31, 2:42 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Minidoka	48 min
May 31, 2:58 PM MDT	Severe Thunderstorm Warning	PIH	Lincoln, Minidoka	33 min
May 31, 3:02 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Blaine, Minidoka, Power	43 min
May 31, 3:12 PM MDT	Tornado Warning	PIH	Bingham, Blaine, Minidoka, Power	33 min
May 31, 3:27 PM MDT	Tornado Warning	PIH	Bingham, Blaine, Butte, Power	34 min
May 31, 3:44 PM MDT	Special Weather Statement	PIH	Cassia	61 min
May 31, 3:57 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Blaine, Bonneville, Butte, Jefferson	44 min
May 31, 4:25 PM MDT	Special Weather Statement	PIH	Jefferson	35 min
May 31, 4:30 PM MDT	Severe Thunderstorm Warning	PIH	Cassia	45 min
May 31, 4:46 PM MDT	Tornado Warning Tornado observed	PIH	Bonneville, Jefferson, Madison	29 min
May 31, 4:50 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont, Jefferson, Madison	40 min
May 31, 5:15 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Fremont, Jefferson, Madison, Teton	45 min
May 31, 5:22 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Cassia, Power	38 min
May 31, 5:24 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont, Jefferson, Madison	51 min

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.