Alert archive / Idaho / Tornado Warnings in 2018

Tornado Warning 10, NWS Pocatello, ID

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

NWS Pocatello, ID issued this tornado warning at May 31, 2018, 4:46 PM MDT for Bonneville County, Jefferson County, Madison County, Idaho. It was in force for 29 min. 5 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, 4:46 PM MDT (22:46 UTC)
Expired: May 31, 2018, 5:15 PM MDT
In force: 29 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Tornado: Observed
Hail: 1.0 in

Counties Bonneville County, ID, Jefferson County, ID, Madison County, ID

The radar

The Pocatello radar (KSFX), 73 km from the middle of the area, began a volume at 22:46 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, 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.
May 31, 5:11 PM MDT	HAIL 1.25	N Roberts, ID
May 31, 5:20 PM MDT	FUNNEL CLOUD	13 W Rexburg, ID	TRAINED WEATHER SPOTTER WEST BOUND ON HIGHWAY 33 AT MILE MARKER 64 OBSERVED FUNNEL CLOUD.
May 31, 5:20 PM MDT	HAIL 1	13 W Rexburg, ID	TRAINED SPOTTER WEST BOUND ON HIGHWAY 33 AT MILE MARKER 64 ESTIMATED HAIL SIZE AT 1 INCH.

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

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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

Riverton, WY (KRIW), launched 12:00Z, 10.8 hours before the alert went out and 310 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: 1930 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

014 
WFUS55 KPIH 312246
TORPIH
IDC019-051-065-312315-
/O.NEW.KPIH.TO.W.0010.180531T2246Z-180531T2315Z/

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

The National Weather Service in Pocatello has issued a

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

* Until 515 PM MDT

* At 444 PM MDT, a confirmed tornado was located 12 miles southwest
  of Roberts or 14 miles northwest of Idaho Falls, moving northeast
  at 40 mph.

  HAZARD...Damaging tornado and quarter size hail. 

  SOURCE...Weather spotters 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. 

* The tornado will be near...
  Roberts around 505 PM MDT. 
  Ucon and Lewisville around 510 PM MDT. 
  Rigby, Lorenzo and Menan around 515 PM MDT. 

Other locations impacted by this tornadic thunderstorm include
Osgood, Thornton 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 4348 11236 4370 11244 4392 11189 4360 11173
TIME...MOT...LOC 2244Z 245DEG 33KT 4359 11230 

TORNADO...OBSERVED
HAIL...1.00IN

$$

JKEYES

2 follow-up statements

264 
WWUS55 KPIH 312301
SVSPIH

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

IDC019-051-065-312315-
/O.CON.KPIH.TO.W.0010.000000T0000Z-180531T2315Z/
Jefferson ID-Bonneville ID-Madison ID-
501 PM MDT THU MAY 31 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR
SOUTHEASTERN JEFFERSON...NORTHWESTERN BONNEVILLE AND WESTERN MADISON
COUNTIES...
    
At 500 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Roberts or 10 miles west of Rigby, moving east at 45
mph.

HAZARD...Tornado and quarter size hail. 

SOURCE...Radar indicated rotation. This storm has a history of 
         producing one or more tornadoes. 

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 dangerous storm will be near...
  Ucon, Menan and Lewisville around 510 PM MDT. 
  Rigby and Lorenzo around 515 PM MDT. 

Other locations impacted by this tornadic thunderstorm include Osgood
and Thornton.

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 4351 11224 4374 11234 4392 11189 4360 11173
TIME...MOT...LOC 2300Z 251DEG 37KT 4363 11211 

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

$$

JKEYES

765 
WWUS55 KPIH 312316
SVSPIH

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

IDC019-051-065-312326-
/O.EXP.KPIH.TO.W.0010.000000T0000Z-180531T2315Z/
Jefferson ID-Bonneville ID-Madison ID-
516 PM MDT THU MAY 31 2018

...THE TORNADO WARNING FOR SOUTHEASTERN JEFFERSON...NORTHWESTERN
BONNEVILLE AND WESTERN MADISON COUNTIES HAS EXPIRED...
    
The tornado threat has diminished and the Tornado Warning has been 
allowed to expire However, large hail and damaging winds remain 
likely and a Severe Thunderstorm Warning remains in effect for the 
area.

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

LAT...LON 4351 11224 4374 11234 4392 11189 4360 11173
TIME...MOT...LOC 2316Z 245DEG 33KT 4369 11194 

$$

JKEYES

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pocatello, ID wrote its last area forecast discussion before this tornado warning went out at May 31, 1:42 PM MDT, 3 hours 4 minutes earlier.

Area forecast discussion, May 31, 1:42 PM MDT, 3 hours 4 minutes before

Area Forecast Discussion
National Weather Service Pocatello ID
142 PM MDT Thu May 31 2018

.SHORT TERM...Tonight through Friday night.

Well, thunderstorms this afternoon are quiet a bit more interesting
that yesterday. A cold front is slowly moving east across the
region. As the afternoon continues, we expect a line of storms to
move slowly east from the Magic Valley. Strong thunderstorms are
also developing well out ahead of the front. Also, some descent low
level shear so an isolated tornado is possible along with large hail
and damaging straight-lined winds. A severe thunderstorm watch is in
effect until 8 PM for much of the region minus Custer County where
it looks like most of the action will remain southeast of there.
Expect activity to gradually diminish this evening as we lose the
heat of the day. During the overnight hours, a reinforcing cold
front will arrive from the northwest. This will spread bring another
round of showers across the region with the best chances for showers
overnight closer to the Montana border. Showers will linger into
Friday morning, perhaps early afternoon around the Teton Valley
area. Then, we will see clearing skies with brisk conditions
developing. Potentially, may need a wind advisory across portions of
the region.

Valle

.LONG TERM...Saturday through next Thursday...The weekend will be
warm and dry with no chance for precipitation. An approaching trough
early next week will bring a chance for precipitation Monday into
Tuesday though chances right now are low. NP/Valle

&&

.AVIATION...Thunderstorms will again run TAF's this afternoon and
evening with a line of thunderstorms expected and isolated severe
thunderstorms expected as well. The line of thunderstorms will track
through BYI, PIH and IDA early this evening. Expect strong wind
gusts with these thunderstorms as well. NP/Valle

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.
&&

In the hours before

Local storm report, May 31, 4:33 PM MDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
433 PM MDT THU MAY 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 PM     FUNNEL CLOUD     5 SW UCON               43.54N 112.03W
05/31/2018                   BONNEVILLE         ID   PUBLIC

            FUNNEL CLOUD OBSERVED - TIME AND LOCATION
            ESTIMATED.

&&

NP

Local storm report, May 31, 4:34 PM MDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
434 PM MDT THU MAY 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0410 PM     TSTM WND GST     WSW ATOMIC CITY         43.44N 112.82W
05/31/2018  M68 MPH          BINGHAM            ID   MESONET

            ARL ATOMIC CITY MESONET SITE AT 410PM.

&&

MH

Local storm report, May 31, 4:35 PM MDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
435 PM MDT THU MAY 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0425 PM     FUNNEL CLOUD     MUD LAKE                43.84N 112.48W
05/31/2018                   JEFFERSON          ID   TRAINED SPOTTER

            OBSERVED WITH PHOTO SENT TO SOCIAL MEDIA -
            TIME ESTIMATED.

&&

NP

Local storm report, May 31, 4:37 PM MDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
437 PM MDT THU MAY 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0431 PM     TORNADO          15 SSW MUD LAKE         43.64N 112.59W
05/31/2018                   JEFFERSON          ID   TRAINED SPOTTER

            SPOTTER IN MUD LAKE LOOKING SSW APPROXIMATELY 15 MILES.
            ROPE TORNADO THAT QUICKLY DISSIPATED.

&&

MH

Local storm report, May 31, 4:39 PM MDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
439 PM MDT THU MAY 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0436 PM     TORNADO          7 SW OSGOOD             43.51N 112.20W
05/31/2018                   BONNEVILLE         ID   PUBLIC

            REPORTED NEAR NOISE PARK.

&&

NP

Local storm report, May 31, 4:42 PM MDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
442 PM MDT THU MAY 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0431 PM     FUNNEL CLOUD     1 NW SHELLEY            43.39N 112.13W
05/31/2018                   BINGHAM            ID   PUBLIC

            LOOKING NORTH.

&&

NP

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, 4:31 PM MDT	Tornado Warning Tornado observed	PIH	Bingham, Bonneville, Jefferson	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.