Alert archive / Idaho / Tornado Warnings in 2018

Tornado Warning 8, NWS Pocatello, ID

May 31, 20184 counties in Idaho

NWS Pocatello, ID issued this tornado warning at May 31, 2018, 3:27 PM MDT for 4 counties in Idaho. It was in force for 34 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: May 31, 2018, 3:27 PM MDT (21:27 UTC)
Expired: May 31, 2018, 4:01 PM MDT
In force: 34 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

Counties Bingham County, ID, Blaine County, ID, Butte County, ID, Power County, ID

The radar

The Pocatello radar (KSFX), 30 km from the middle of the area, began a volume at 21:26 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.

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

Boise Airport, ID (KBOI), launched 12:00Z, 9.5 hours before the alert went out and 259 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.

482 
WFUS55 KPIH 312127
TORPIH
IDC011-013-023-077-312215-
/O.NEW.KPIH.TO.W.0008.180531T2127Z-180531T2215Z/

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

The National Weather Service in Pocatello has issued a

* Tornado Warning for...
  Southeastern Blaine County in central Idaho...
  South central Butte County in southeastern Idaho...
  Northwestern Power County in southeastern Idaho...
  West central Bingham County in southeastern Idaho...

* Until 415 PM MDT
    
* At 326 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 18 miles northwest of Aberdeen or 23 miles northwest of
  American Falls Reservoir, moving northeast at 35 mph.

  HAZARD...Tornado and golf ball 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
  southeastern Blaine...south central Butte...northwestern Power and
  west central Bingham Counties, including the following locations:
  Coxs Well Airport.

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 4299 11306 4311 11331 4340 11308 4326 11275
TIME...MOT...LOC 2126Z 205DEG 29KT 4308 11314 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

KB

2 follow-up statements

043 
WWUS55 KPIH 312143
SVSPIH

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

IDC011-013-023-077-312215-
/O.CON.KPIH.TO.W.0008.000000T0000Z-180531T2215Z/
Blaine ID-Butte ID-Power ID-Bingham ID-
343 PM MDT THU MAY 31 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR
SOUTHEASTERN BLAINE...SOUTH CENTRAL BUTTE...NORTHWESTERN POWER AND
WEST CENTRAL BINGHAM COUNTIES...
    
At 342 PM MDT, a severe thunderstorm capable of producing a tornado
was located 19 miles northwest of Springfield or 24 miles northwest
of American Falls Reservoir, moving northeast at 30 mph.

HAZARD...Tornado and golf ball 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
southeastern Blaine...south central Butte...northwestern Power and
west 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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4307 11297 4317 11326 4340 11308 4326 11275
TIME...MOT...LOC 2142Z 210DEG 25KT 4320 11306 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

KB

561 
WWUS55 KPIH 312201
SVSPIH

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

IDC011-013-023-077-312208-
/O.CAN.KPIH.TO.W.0008.000000T0000Z-180531T2215Z/
Blaine ID-Butte ID-Power ID-Bingham ID-
401 PM MDT THU MAY 31 2018

...THE TORNADO WARNING FOR SOUTHEASTERN BLAINE...SOUTH CENTRAL
BUTTE...NORTHWESTERN POWER AND WEST CENTRAL BINGHAM COUNTIES IS
CANCELLED...
    
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.  

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

LAT...LON 4307 11297 4317 11326 4340 11308 4326 11275
TIME...MOT...LOC 2157Z 205DEG 29KT 4332 11298 

$$

KB

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, 1 hour 45 minutes earlier.

Area forecast discussion, May 31, 1:42 PM MDT, 1 hour 45 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, 2:22 PM MDT, 1 hour 5 minutes before

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

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

0145 PM     HAIL             2 WSW RIRIE             43.62N 111.80W
05/31/2018  M1.25 INCH       BONNEVILLE         ID   PUBLIC

            REPORTED FROM EAST IDAHO NEWS.COM SOCIAL
            MEDIA.

&&

NP

Local storm report, May 31, 2:24 PM MDT, 1 hour 3 minutes before

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

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

0223 PM     HAIL             SUGAR CITY              43.87N 111.75W
05/31/2018  E0.25 INCH       MADISON            ID   PUBLIC

            HEAVY RAIN AT TIMES.

&&

NP

Local storm report, May 31, 2:25 PM MDT, 1 hour 2 minutes before

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

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

0218 PM     HAIL             RUPERT                  42.62N 113.67W
05/31/2018  E0.50 INCH       MINIDOKA           ID   TRAINED SPOTTER

&&

NP

Local storm report, May 31, 2:29 PM MDT, 58 minutes before

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

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

0141 PM     FUNNEL CLOUD     1 WNW IDAHO FALLS       43.50N 112.05W
05/31/2018                   BONNEVILLE         ID   TRAINED SPOTTER

            CORRECTS PREVIOUS FUNNEL CLOUD REPORT FROM 1
            WNW IDAHO FALLS.

&&

NP

Local storm report, May 31, 2:40 PM MDT, 47 minutes before

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

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

0215 PM     HAIL             W RUPERT                42.62N 113.67W
05/31/2018  M1.00 INCH       MINIDOKA           ID   PUBLIC

            DIME TO QUARTER SIZE HAIL OBSERVED IN CITY
            LIMITS.

&&

NP

Local storm report, May 31, 3:01 PM MDT, 26 minutes before

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

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

0245 PM     HAIL             RUPERT                  42.62N 113.67W
05/31/2018  E0.50 INCH       MINIDOKA           ID   PUBLIC

            MARBLE AND PEA SIZE HAIL.

&&

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, 3:44 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, 4:46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.