Alert archive / Idaho / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 18, NWS Pocatello, ID

September 10, 20215 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Sep 10, 2021, 4:00 PM MDT for 5 counties in Idaho. It was in force for 30 min. 3 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: Sep 10, 2021, 4:00 PM MDT (22:00 UTC)
Expired: Sep 10, 2021, 4:30 PM MDT
In force: 30 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Butte County, ID, Clark County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID

The radar

The Pocatello radar (KSFX), 98 km from the middle of the area, began a volume at 21:59 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
Sep 10, 4:00 PM MDT	TSTM WND GST 60	9 Ssw Mud Lake, ID	MESONET STATION ROV 9 SSW MUD LAKE.
Sep 10, 4:05 PM MDT	TSTM WND GST 60	9 Ssw Mud Lake, ID	MESONET STATION ROV 9 SSW MUD LAKE.
Sep 10, 4:15 PM MDT	TSTM WND GST 60	1 Ne Terreton, ID	MESONET STATION TER 1 NE TERRETON.

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

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 10.0 hours before the alert went out and 322 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: 4044 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

373 
WUUS55 KPIH 102200
SVRPIH
IDC023-033-043-051-065-102230-
/O.NEW.KPIH.SV.W.0018.210910T2200Z-210910T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
400 PM MDT Fri Sep 10 2021

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Southwestern Fremont County in southeastern Idaho...
  Jefferson County in southeastern Idaho...
  Eastern Butte County in southeastern Idaho...
  Northwestern Madison County in southeastern Idaho...
  South central Clark County in southeastern Idaho...

* Until 430 PM MDT.

* At 400 PM MDT, severe thunderstorms were located along a line
  extending from 6 miles southwest of Mud Lake to 7 miles southwest
  of Roberts, moving north at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Dubois, Terreton, Roberts, Mud Lake, Hamer, Monteview, Small, Sage
  Junction and southern Saint Anthony Sand Dunes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4409 11179 4362 11211 4363 11240 4374 11270
      4434 11249
TIME...MOT...LOC 2200Z 200DEG 50KT 4378 11258 4365 11223 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

DMH

2 follow-up statements

325 
WWUS55 KPIH 102216
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
416 PM MDT Fri Sep 10 2021

IDC023-033-043-051-065-102230-
/O.CON.KPIH.SV.W.0018.000000T0000Z-210910T2230Z/
Fremont ID-Jefferson ID-Butte ID-Madison ID-Clark ID-
416 PM MDT Fri Sep 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM MDT
FOR SOUTHWESTERN FREMONT...JEFFERSON...EASTERN BUTTE...NORTHWESTERN
MADISON AND SOUTH CENTRAL CLARK COUNTIES...

At 415 PM MDT, severe thunderstorms were located along a line
extending from near Monteview to 6 miles southeast of Hamer, moving
north at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Dubois, Terreton, Roberts, Mud Lake, Hamer, Monteview, Small, Sage
Junction and southern Saint Anthony Sand Dunes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4409 11179 4362 11211 4363 11240 4374 11270
      4434 11249
TIME...MOT...LOC 2215Z 200DEG 50KT 4397 11248 4384 11213 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

DMH

286 
WWUS55 KPIH 102230
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
430 PM MDT Fri Sep 10 2021

IDC023-033-043-051-065-102238-
/O.EXP.KPIH.SV.W.0018.000000T0000Z-210910T2230Z/
Fremont ID-Jefferson ID-Butte ID-Madison ID-Clark ID-
430 PM MDT Fri Sep 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN FREMONT...
JEFFERSON...EASTERN BUTTE...NORTHWESTERN MADISON AND SOUTH CENTRAL
CLARK COUNTIES WILL EXPIRE AT 430 PM MDT...

The outflow from strong storms which prompted the warning have moved 
north. Therefore, the warning will be allowed to expire. Gusty winds 
are still possible.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Southwest Fremont, North central Jefferson and Central Clark 
counties until 5 PM MDT.

LAT...LON 4409 11179 4362 11211 4363 11240 4374 11270
      4434 11249
TIME...MOT...LOC 2228Z 200DEG 50KT 4412 11240 4399 11205 

$$

DMH

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 2:47 AM MDT	Red Flag Warning	PIH	Bannock, Bear Lake, Bingham, Blaine, Boise, Bonneville and 19 more	19 hr
Sep 10, 2:26 PM MDT	Special Weather Statement	PIH	Minidoka	34 min
Sep 10, 2:50 PM MDT	Special Weather Statement	PIH	Bingham, Power	25 min
Sep 10, 3:09 PM MDT	Special Weather Statement	PIH	Blaine	36 min
Sep 10, 3:15 PM MDT	Special Weather Statement	PIH	Bannock, Bingham, Jefferson, Power	45 min
Sep 10, 3:18 PM MDT	Special Weather Statement	PIH	Blaine, Lincoln, Minidoka	27 min
Sep 10, 3:45 PM MDT	Special Weather Statement	PIH	Blaine, Butte, Custer, Minidoka	30 min
Sep 10, 4:04 PM MDT	Special Weather Statement	PIH	Bingham	26 min
Sep 10, 4:16 PM MDT	Special Weather Statement	PIH	Butte	29 min
Sep 10, 4:21 PM MDT	Special Weather Statement	PIH	Butte	24 min
Sep 10, 4:23 PM MDT	Severe Thunderstorm Warning	PIH	Power	24 min
Sep 10, 4:28 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont, Jefferson	14 min
Sep 10, 4:34 PM MDT	Special Weather Statement	PIH	Bonneville, Jefferson, Madison	26 min
Sep 10, 4:42 PM MDT	Special Weather Statement	PIH	Butte	33 min
Sep 10, 4:46 PM MDT	Special Weather Statement	PIH	Power	29 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2021 Every severe thunderstorm warning in 2021

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.