Alert archive / Idaho / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 48, NWS Pocatello, ID
NWS Pocatello, ID issued this severe thunderstorm warning at Sep 19, 2020, 4:29 PM MDT for 6 counties in Idaho. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 19, 2020, 4:29 PM MDT (22:29 UTC)
- Expired
- Sep 19, 2020, 5:15 PM MDT
- In force
- 46 min
- Issued by
- NWS Pocatello, ID
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bingham County, ID, Bonneville County, ID, Clark County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID
The radar
The Pocatello radar (KSFX), 95 km from the middle of the area, began a volume at 22:31 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
Riverton, WY (KRIW), launched 12:00Z, 10.5 hours before the alert went out and 299 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
- 3112 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Sep 19, 1:45 PM MDT, 2 hours 44 minutes earlier.
Area forecast discussion, Sep 19, 1:45 PM MDT, 2 hours 44 minutes before
Area Forecast Discussion National Weather Service Pocatello ID 145 PM MDT Sat Sep 19 2020 .SHORT TERM...Rest of Tonight...Isolated Showers and thunderstorms have already developed over the Central Mountains this afternoon while the earlier line of showers from this morning exits into western Wyoming. Several short term models show a developing line of showers/thunderstorms during the mid- afternoon hours across the Arco Desert/Upper Snake River Plain tracking southeastward across the I-15 corridor and Idaho Falls to Rexburg. Within the organized line would be the potential for small hail and gusty winds while it continues it trek toward the Teton Valley early this evening. Out ahead of this line, isolated thunderstorms are possible this afternoon as well, including the southern highland areas all the way to eastward to Bear Lake. Eastern Magic Valley area and South Hills areas area least likely to see thunderstorm develop but are expected to see gusty west or northwest winds. Improvement to wind speeds and decreasing chances of thunderstorms are forecast between 8 pm and 10 pm. .Sunday through Tuesday...Zonal flow will allow for mild temperatures and generally light winds this forecast period. A ridge of high pressure begins to build back into the area from the south by Monday, which will shift our winds back from the southwest and begin to increase temperatures slightly. This time period is expected to be precipitation free. ND LONG TERM...Tuesday through Saturday. A weak system will pass east south of Idaho but expect a chance of showers and thunderstorms in the far eastern part of the state near the Wyoming border. Will be dry Wednesday and Thursday with the chance of showers returning mainly to the central mountains and eastern highlands. Temperatures will be above normal through Friday with cooling expected by Saturday as the next system works east. Low confidence at the end of the long term period as models greatly different with GFS slower and wetter and European model drier and weaker with the end of the week system. Winds may increase by Friday into Saturday as well. GK && .FIRE WEATHER... Isolated to widely scattered thunderstorms will be possible through sunset tonight with some breezy conditions as well. Gusts of 20 to 30 mph will be possible especially in zones 410. Brunt of thunderstorm activity will be in zones 475, 476, 422, 410 and 411. All locations will see at least isolated activity. Humidity is way up today and should remain so through Sunday. Temperatures will begin to moderate Sunday and remain above normal through next week. Next chance for showers will be in the far east Tuesday mainly zones 413, 410 and 411. Could be breezy as well Tuesday but not expecting highlights as humidity stays above 15 percent. GK && .AVIATION...Showers and thunderstorms have developed this afternoon and have vicinity at all sites with SUN, BYi and DIJ most likely to see on station but can't rule out anywhere. Will have 10 to 20 knot sustained winds through sunset at all sites before dying down. Will have clear skies throughout the day Sunday with up valley 10 to 15 knot afternoon winds at PIH and IDA. GK && .AIR STAGNATION...Air Quality concerns from regional wildfire smoke look to improve today as a low pressure trough moves through our area and flow turns more westerly. This essentially 'closes off' flow from the CA wildfires for the time being. Keep in mind though that smoke from local wildfires will certainly still impact the air quality. This pattern of a general westerly flow looks to continue through Monday before gradually opening back up again from the southwest. ND && .PIH WATCHES/WARNINGS/ADVISORIES... None. &&
In the hours before
Special weather statement, Sep 19, 3:31 PM MDT, 58 minutes before
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</html>The office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 1:05 PM MDT | Special Weather Statement | PIH | Camas | 55 min |
| Sep 19, 1:36 PM MDT | Special Weather Statement | PIH | Butte | 54 min |
| Sep 19, 1:54 PM MDT | Special Weather Statement | PIH | Blaine | 51 min |
| Sep 19, 2:09 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Custer | 36 min |
| Sep 19, 2:30 PM MDT | Special Weather Statement | PIH | Oneida | 45 min |
| Sep 19, 2:41 PM MDT | Special Weather Statement | PIH | Butte | 64 min |
| Sep 19, 2:47 PM MDT | Special Weather Statement | PIH | Cassia | 43 min |
| Sep 19, 2:56 PM MDT | Special Weather Statement | PIH | Blaine | 49 min |
| Sep 19, 3:22 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Jefferson | 23 min |
| Sep 19, 3:26 PM MDT | Special Weather Statement | PIH | Oneida | 49 min |
| Sep 19, 3:31 PM MDT | Special Weather Statement | PIH | Butte | 44 min |
| Sep 19, 3:44 PM MDT | Severe Thunderstorm Warning | PIH | Butte, Jefferson | 46 min |
| Sep 19, 3:52 PM MDT | Special Weather Statement | PIH | Jefferson | 53 min |
| Sep 19, 4:02 PM MDT | Special Weather Statement | PIH | Bannock | 58 min |
| Sep 19, 4:07 PM MDT | Special Weather Statement | PIH | Cassia | 53 min |
| Sep 19, 4:08 PM MDT | Severe Thunderstorm Warning | PIH | Clark, Fremont, Jefferson | 23 min |
| Sep 19, 4:12 PM MDT | Special Weather Statement | PIH | Bannock | 33 min |
| Sep 19, 4:19 PM MDT | Special Weather Statement | PIH | Bear Lake, Franklin, Oneida | 56 min |
| Sep 19, 4:49 PM MDT | Special Weather Statement | PIH | Bannock | 56 min |
| Sep 19, 4:50 PM MDT | Special Weather Statement | PIH | Bingham | 40 min |
| Sep 19, 5:04 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Fremont, Jefferson, Madison | 41 min |
| Sep 19, 5:16 PM MDT | Special Weather Statement | PIH | Fremont | 59 min |
| Sep 19, 5:19 PM MDT | Special Weather Statement | PIH | Franklin | 41 min |
| Sep 19, 5:34 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Fremont, Jefferson, Madison, Teton | 41 min |
| Sep 19, 5:38 PM MDT | Severe Thunderstorm Warning | PIH | Bonneville, Fremont, Jefferson, Madison, Teton | 37 min |
| Sep 19, 5:43 PM MDT | Special Weather Statement | PIH | Bear Lake | 32 min |
| Sep 19, 5:43 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Bonneville, Caribou | 32 min |
Nearby
Severe Thunderstorm Warnings in Idaho, 2020Every severe thunderstorm warning in 2020
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.