Alert archive / Idaho / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 30, NWS Pocatello, ID

May 31, 20184 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at May 31, 2018, 1:44 PM MDT for 4 counties in Idaho. It was in force for 46 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, 1:44 PM MDT (19:44 UTC)
Expired: May 31, 2018, 2:30 PM MDT
In force: 46 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

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

The radar

The Pocatello radar (KSFX), 93 km from the middle of the area, began a volume at 19:46 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, 1:45 PM MDT	HAIL 1.25	2 Wsw Ririe, ID	REPORTED FROM EAST IDAHO NEWS.COM SOCIAL MEDIA.
May 31, 1:58 PM MDT	HAIL 0.5	Ririe, ID
May 31, 2:01 PM MDT	FUNNEL CLOUD	1 Wnw Idaho Falls, ID
May 31, 2:23 PM MDT	HAIL 0.25	Sugar City, ID	HEAVY RAIN AT TIMES.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 1 minutes after it went out.

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, 7.7 hours before the alert went out and 288 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.

141 
WUUS55 KPIH 311944
SVRPIH
IDC019-043-051-065-312045-
/O.NEW.KPIH.SV.W.0030.180531T1944Z-180531T2045Z/

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

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Southwestern Fremont County in southeastern Idaho...
  Southeastern Jefferson County in southeastern Idaho...
  North central Bonneville County in southeastern Idaho...
  Western Madison County in southeastern Idaho...

* Until 245 PM MDT

* At 143 PM MDT, a severe thunderstorm was located near Idaho Falls,
  moving northeast at 60 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Idaho Falls, Rexburg, Rigby, Lorenzo, Ammon, Iona, Sugar City,
  Ucon, Menan, Teton, Ririe, Lewisville, Parker, Archer, Egin, St
  Anthony, Chester, Plano, Newdale and Osgood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4340 11190 4350 11216 4412 11189 4403 11145
TIME...MOT...LOC 1943Z 207DEG 52KT 4354 11200 

HAIL...1.25IN
WIND...60MPH
 
$$

KB

3 follow-up statements

271 
WWUS55 KPIH 311955
SVSPIH

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

IDC019-043-051-065-312045-
/O.CON.KPIH.SV.W.0030.000000T0000Z-180531T2045Z/
Fremont ID-Jefferson ID-Bonneville ID-Madison ID-
155 PM MDT THU MAY 31 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR SOUTHWESTERN FREMONT...SOUTHEASTERN JEFFERSON...NORTH CENTRAL
BONNEVILLE AND WESTERN MADISON COUNTIES...

At 155 PM MDT, a severe thunderstorm was located over Rigby, moving
northeast at 60 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...
Rexburg, Rigby, Lorenzo, Sugar City, Ucon, Menan, Teton, Ririe,
Lewisville, Parker, Archer, Egin, St Anthony, Chester, Plano,
Newdale, Thornton and Saint Anthony Sand Dunes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4351 11182 4359 11210 4412 11189 4403 11145
TIME...MOT...LOC 1955Z 207DEG 52KT 4369 11189 

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

KB

537 
WWUS55 KPIH 312010
SVSPIH

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

IDC019-043-051-065-312045-
/O.CON.KPIH.SV.W.0030.000000T0000Z-180531T2045Z/
Fremont ID-Jefferson ID-Bonneville ID-Madison ID-
210 PM MDT THU MAY 31 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR SOUTHWESTERN FREMONT...SOUTHEASTERN JEFFERSON...NORTH CENTRAL
BONNEVILLE AND WESTERN MADISON COUNTIES...

At 210 PM MDT, a severe thunderstorm was located near Archer or near
Rexburg, 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...
Rexburg, Rigby, Lorenzo, Sugar City, Ucon, Menan, Teton, Ririe,
Lewisville, Parker, Archer, Egin, St Anthony, Chester, Plano,
Newdale, Thornton and Saint Anthony Sand Dunes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4351 11182 4359 11210 4412 11189 4403 11145
TIME...MOT...LOC 2010Z 207DEG 38KT 4376 11178 

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

KB

165 
WWUS55 KPIH 312030 RRA
SVSPIH

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

IDC019-043-051-065-312039-
/O.CAN.KPIH.SV.W.0030.000000T0000Z-180531T2045Z/
Fremont ID-Jefferson ID-Bonneville ID-Madison ID-
230 PM MDT THU MAY 31 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN FREMONT...
SOUTHEASTERN JEFFERSON...NORTH CENTRAL BONNEVILLE AND WESTERN MADISON
COUNTIES IS CANCELLED...
                
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 has been cancelled.  However small hail and
gusty winds are still possible with this thunderstorm.

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

LAT...LON 4351 11182 4359 11210 4412 11189 4403 11145
TIME...MOT...LOC 2029Z 207DEG 52KT 4402 11160 

$$

KB

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, 2 minutes earlier.

Area forecast discussion, May 31, 1:42 PM MDT, 2 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, 12:50 PM MDT, 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1250 PM MDT THU MAY 31 2018

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

1246 PM     HAIL             1 SW AMMON              43.47N 111.98W
05/31/2018  M1.00 INCH       BONNEVILLE         ID   NWS EMPLOYEE

            SOME PONDING ON ROADWAYS AS WELL.

&&

NP

Local storm report, May 31, 12:51 PM MDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1251 PM MDT THU MAY 31 2018

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

1246 PM     HAIL             1 W IDAHO FALLS         43.49N 112.05W
05/31/2018  E0.88 INCH       BONNEVILLE         ID   PUBLIC

&&

NP

Local storm report, May 31, 12:58 PM MDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
1258 PM MDT THU MAY 31 2018

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

1258 PM     HAIL             2 E UCON                43.59N 111.88W
05/31/2018  M0.75 INCH       BONNEVILLE         ID   TRAINED SPOTTER

&&

NP

Local storm report, May 31, 1:06 PM MDT, 38 minutes before

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

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

0106 PM     HAIL             1 WNW IDAHO FALLS       43.50N 112.05W
05/31/2018  M0.88 INCH       BONNEVILLE         ID   PUBLIC

&&

NP

Local storm report, May 31, 1:42 PM MDT, 2 minutes before

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

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

0142 PM     HAIL             IDAHO FALLS             43.49N 112.04W
05/31/2018  E0.25 INCH       BONNEVILLE         ID   PUBLIC

&&

NP

Special weather statement, May 31, 1:42 PM MDT, 2 minutes before

Special Weather Statement
National Weather Service Pocatello ID
142 PM MDT THU MAY 31 2018

IDZ017-312015-
Eastern Magic Valley ID-
142 PM MDT THU MAY 31 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LINCOLN COUNTY UNTIL
215 PM MDT...

At 141 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Eden or 18 miles east of Jerome, moving
northeast at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

This storm will remain over mainly rural areas of southeastern
Lincoln County.

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

LAT...LON 4277 11405 4281 11405 4281 11416 4301 11410
      4293 11385 4277 11402
TIME...MOT...LOC 1941Z 050DEG 28KT 4272 11416

RS

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, 1:58 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, 5:22 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

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.