Alert archive / Idaho / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 39, NWS Pocatello, ID

May 31, 2018Blaine County, Cassia County, Power County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at May 31, 2018, 5:22 PM MDT for Blaine County, Cassia County, Power County, Idaho. It was in force for 38 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, 5:22 PM MDT (23:22 UTC)
Expired: May 31, 2018, 6:00 PM MDT
In force: 38 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Blaine County, ID, Cassia County, ID, Power County, ID

The radar

The Pocatello radar (KSFX), 85 km from the middle of the area, began a volume at 23:25 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 severe thunderstorm 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

Elko, NV (KLKN), launched 12:00Z, 11.4 hours before the alert went out and 194 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: 16 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1320 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

160 
WUUS55 KPIH 312322
SVRPIH
IDC013-031-077-010000-
/O.NEW.KPIH.SV.W.0039.180531T2322Z-180601T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
522 PM MDT THU MAY 31 2018

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Southeastern Blaine County in central Idaho...
  Southwestern Power County in southeastern Idaho...
  Northeastern Cassia County in southeastern Idaho...

* Until 600 PM MDT

* At 521 PM MDT, a severe thunderstorm was located near Malta, moving
  northeast at 45 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...
  Malta, southern Lake Walcott, Rockland, Cold Water Rest Area, Yale
  Rest Area, Idahome and Massacre Rocks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4224 11330 4242 11356 4278 11320 4259 11280
TIME...MOT...LOC 2321Z 216DEG 40KT 4237 11336 

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

Valle

2 follow-up statements

850 
WWUS55 KPIH 312347
SVSPIH

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

IDC013-031-077-010000-
/O.CON.KPIH.SV.W.0039.000000T0000Z-180601T0000Z/
Blaine ID-Power ID-Cassia ID-
547 PM MDT THU MAY 31 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR SOUTHEASTERN BLAINE...SOUTHWESTERN POWER AND NORTHEASTERN CASSIA
COUNTIES...

At 546 PM MDT, a severe thunderstorm was located over Cold Water 
Rest Area or 13 miles east of Lake Walcott, moving northeast at 45 
mph. This storm previously produced gusts to 73 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...
Malta, southern Lake Walcott, Rockland, Cold Water Rest Area, Yale
Rest Area, Idahome and Massacre Rocks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4224 11330 4242 11356 4278 11320 4259 11280
TIME...MOT...LOC 2346Z 216DEG 40KT 4260 11314 

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

RS

665 
WWUS55 KPIH 312356
SVSPIH

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

IDC013-031-077-010005-
/O.EXP.KPIH.SV.W.0039.000000T0000Z-180601T0000Z/
Blaine ID-Power ID-Cassia ID-
556 PM MDT THU MAY 31 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLAINE...
SOUTHWESTERN POWER AND NORTHEASTERN CASSIA COUNTIES WILL EXPIRE AT
600 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.

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

LAT...LON 4224 11330 4242 11356 4278 11320 4259 11280
TIME...MOT...LOC 2355Z 216DEG 40KT 4267 11307 

$$

RS

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at May 31, 1:42 PM MDT, 3 hours 40 minutes earlier.

Area forecast discussion, May 31, 1:42 PM MDT, 3 hours 40 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, 4:53 PM MDT, 29 minutes before

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

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

0354 PM     FUNNEL CLOUD     BLACKFOOT               43.19N 112.34W
05/31/2018                   BINGHAM            ID   PUBLIC

            PHOTO TAKEN FROM BLACKFOOT. TIME UNKNOWN.

&&

NP

Local storm report, May 31, 5:03 PM MDT, 19 minutes before

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

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

0501 PM     FUNNEL CLOUD     AMMON                   43.47N 111.97W
05/31/2018                   BONNEVILLE         ID   PUBLIC

            LOOKING WEST. TIME ESTIMATED. LOCATION OF
            FUNNEL UNKNOWN.

&&

NP

Local storm report, May 31, 5:04 PM MDT, 18 minutes before

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

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

0445 PM     TSTM WND GST     13 W ALMO               42.10N 113.88W
05/31/2018  M73 MPH          CASSIA             ID   MESONET

            THUNDERSTORM WIND GUST OF 73 MPH MEASURED BY GOOSE CREEK
            RAWS SITE GSKI1.

&&

RSURVICK

Local storm report, May 31, 5:08 PM MDT, 14 minutes before

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

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

0445 PM     HAIL             NW ROBERTS              43.72N 112.13W
05/31/2018  M1.00 INCH       JEFFERSON          ID   TRAINED SPOTTER

&&

RSURVICK

Local storm report, May 31, 5:12 PM MDT, 10 minutes before

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

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

0511 PM     HAIL             N ROBERTS               43.73N 112.13W
05/31/2018  E1.25 INCH       JEFFERSON          ID   TRAINED SPOTTER

&&

MH

Local storm report, May 31, 5:15 PM MDT, 7 minutes before

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

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

0510 PM     HAIL             ROBERTS                 43.72N 112.13W
05/31/2018  E1.00 INCH       JEFFERSON          ID   PUBLIC

            ACCOMPANIED WITH 50 MPH WINDS AS WELL.

&&

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, 4:46 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, 5:24 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont, Jefferson, Madison	51 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2018 Every severe thunderstorm warning 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.