Alert archive / Idaho / Frost Advisories in 2021
Frost Advisory 9, NWS Pocatello, ID
NWS Pocatello, ID issued this frost advisory at Sep 19, 2021, 2:11 AM MDT for 12 counties in Idaho. It took effect at Sep 20, 2021, 3:00 AM MDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Sep 19, 2021, 2:11 AM MDT (08:11 UTC)
- In effect from
- Sep 20, 2021, 3:00 AM MDT
- Expired
- Sep 20, 2021, 9:00 AM MDT
- In force
- 6 hr
- Issued by
- NWS Pocatello, ID
Counties Bannock County, ID, Bingham County, ID, Blaine County, ID, Bonneville County, ID, Butte County, ID, Cassia County, ID, Fremont County, ID, Jefferson County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Power County, ID
The radar
The Pocatello radar (KSFX), 18 km from the middle of the area, began a volume at 08:12 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.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 00:00Z, 8.2 hours before the alert went out and 280 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2068 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- -209 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
836 WWUS75 KPIH 190811 NPWPIH URGENT - WEATHER MESSAGE National Weather Service Pocatello ID 211 AM MDT Sun Sep 19 2021 IDZ051>055-192130- /O.NEW.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Shoshone/Lava Beds-Arco/Mud Lake Desert-Upper Snake River Plain- Lower Snake River Plain-Eastern Magic Valley- Including the cities of Shoshone, Richfield, Carey, Mud Lake, INL, Craters of the Moon NM, Idaho Falls, Rexburg, St. Anthony, Pocatello, Blackfoot, American Falls, Shelley, Fort Hall, Burley, Rupert, Heyburn, and Oakley 211 AM MDT Sun Sep 19 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...From the eastern Magic Valley, including Shoshone and Burley, to the northern end of the Snake River plain, including Rexburg and Saint Anthony. This also includes the cities of American Falls, Pocatello, Chubbuck, Blackfoot, Idaho Falls, and Rigby. * WHEN...From 3 AM to 9 AM MDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
4 follow-up statements
665 WWUS75 KPIH 191446 NPWPIH URGENT - WEATHER MESSAGE National Weather Service Pocatello ID 846 AM MDT Sun Sep 19 2021 IDZ054-192100- /O.NEW.KPIH.LW.Y.0028.210919T1800Z-210920T0200Z/ /O.CON.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Lower Snake River Plain- Including the cities of Pocatello, Blackfoot, American Falls, Shelley, and Fort Hall 846 AM MDT Sun Sep 19 2021 ...LAKE WIND ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS EVENING... ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... * WHAT...For the Lake Wind Advisory, southwest winds 20 to 25 mph with gusts up to 35 mph expected. For the Frost Advisory, temperatures as low as 35 will result in frost formation. * WHERE...American Falls Reservoir for the Lake Wind Advisory. The Lower Snake River Plain for the Frost Advisory, mostly impacting those areas northwest of American Falls Reservoir including American Falls, Aberdeen, and the Rockford areas. * WHEN...For the Lake Wind Advisory, from noon today to 8 PM MDT this evening. For the Frost Advisory, from 3 AM to 9 AM MDT Monday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous boating conditions for small water-craft. Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft. Take steps now to protect tender plants from the cold. && $$ IDZ051>053-055-192100- /O.CON.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Shoshone/Lava Beds-Arco/Mud Lake Desert-Upper Snake River Plain- Eastern Magic Valley- Including the cities of Shoshone, Richfield, Carey, Mud Lake, INL, Craters of the Moon NM, Idaho Falls, Rexburg, St. Anthony, Burley, Rupert, Heyburn, and Oakley 846 AM MDT Sun Sep 19 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Eastern Magic Valley, Shoshone Desert, Mud Lake Desert, and the Upper Snake River Plain. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
157 WWUS75 KPIH 191912 NPWPIH URGENT - WEATHER MESSAGE National Weather Service Pocatello ID 112 PM MDT Sun Sep 19 2021 IDZ054-200200- /O.CON.KPIH.LW.Y.0028.000000T0000Z-210920T0200Z/ /O.CON.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Lower Snake River Plain- Including the cities of Pocatello, Blackfoot, American Falls, Shelley, and Fort Hall 112 PM MDT Sun Sep 19 2021 ...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING... ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... * WHAT...For the Lake Wind Advisory, southwest winds 20 to 25 mph with gusts up to 35 mph expected. For the Frost Advisory, temperatures as low as 34 will result in frost formation. * WHERE...American Falls Reservoir for the Lake Wind Advisory. The Lower Snake River Plain for the Frost Advisory, mostly impacting those areas northwest of Interstate corridor including American Falls, Aberdeen, and the Rockford areas. * WHEN...For the Lake Wind Advisory, continuing until 8 PM MDT this evening. For the Frost Advisory, from 3 AM to 9 AM MDT Monday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous boating conditions for small water-craft. Frost can kill or damage sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft. Take steps now to protect tender plants from the cold. && $$ IDZ051>053-055-200200- /O.CON.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Shoshone/Lava Beds-Arco/Mud Lake Desert-Upper Snake River Plain- Eastern Magic Valley- Including the cities of Shoshone, Richfield, Carey, Mud Lake, INL, Craters of the Moon NM, Idaho Falls, Rexburg, St. Anthony, Burley, Rupert, Heyburn, and Oakley 112 PM MDT Sun Sep 19 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Eastern Magic Valley, Shoshone Desert, Mud Lake Desert, and the Upper Snake River Plain. * WHEN...Monday morning from 3 AM to 9 AM MDT. * IMPACTS...Frost can kill or damage sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
059 WWUS75 KPIH 200154 NPWPIH URGENT - WEATHER MESSAGE National Weather Service Pocatello ID 754 PM MDT Sun Sep 19 2021 IDZ054-201500- /O.EXP.KPIH.LW.Y.0028.000000T0000Z-210920T0200Z/ /O.CON.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Lower Snake River Plain- Including the cities of Pocatello, Blackfoot, American Falls, Shelley, and Fort Hall 754 PM MDT Sun Sep 19 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... ...LAKE WIND ADVISORY WILL EXPIRE AT 8 PM MDT THIS EVENING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...American Falls Reservoir for the Lake Wind Advisory. The Lower Snake River Plain for the Frost Advisory, mostly impacting those areas northwest of Interstate corridor including American Falls, Aberdeen, and the Rockford areas. * WHEN...For the Lake Wind Advisory, continuing until 8 PM MDT this evening. For the Frost Advisory, from 3 AM to 9 AM MDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ IDZ051>053-055-201500- /O.CON.KPIH.FR.Y.0009.210920T0900Z-210920T1500Z/ Shoshone/Lava Beds-Arco/Mud Lake Desert-Upper Snake River Plain- Eastern Magic Valley- Including the cities of Shoshone, Richfield, Carey, Mud Lake, INL, Craters of the Moon NM, Idaho Falls, Rexburg, St. Anthony, Burley, Rupert, Heyburn, and Oakley 754 PM MDT Sun Sep 19 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM MDT MONDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Eastern Magic Valley, Shoshone Desert, Mud Lake Desert, and the Upper Snake River Plain. * WHEN...Monday morning from 3 AM to 9 AM MDT. * IMPACTS...Frost can kill or damage sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/pocatello
886 WWUS75 KPIH 201500 NPWPIH URGENT - WEATHER MESSAGE National Weather Service Pocatello ID 900 AM MDT Mon Sep 20 2021 IDZ051>055-201600- /O.EXP.KPIH.FR.Y.0009.000000T0000Z-210920T1500Z/ Shoshone/Lava Beds-Arco/Mud Lake Desert-Upper Snake River Plain- Lower Snake River Plain-Eastern Magic Valley- Including the cities of Shoshone, Richfield, Carey, Mud Lake, INL, Craters of the Moon NM, Idaho Falls, Rexburg, St. Anthony, Pocatello, Blackfoot, American Falls, Shelley, Fort Hall, Burley, Rupert, Heyburn, and Oakley 900 AM MDT Mon Sep 20 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM MDT THIS MORNING... Temperature have begun to warm into the upper 30s and 40s across the warned area, thus the Frost Advisory will be allowed to expire at 9 AM MDT. $$ For more information from the National Weather Service visit https://weather.gov/pocatello
The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 8:46 AM MDT | Lake Wind Advisory | PIH | Bannock, Bingham, Power | 11 hr |
| Sep 19, 11:16 AM MDT | Special Weather Statement | PIH | Minidoka | 59 min |
| Sep 19, 12:07 PM MDT | Special Weather Statement | PIH | Cassia, Power | 53 min |
Nearby
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.