Alert archive / Idaho / Special Weather Statements in 2021
Special Weather Statement, NWS Pocatello, ID
NWS Pocatello, ID issued this special weather statement at Aug 21, 2021, 2:30 PM MDT for Franklin County, Idaho. It was in force for 45 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
- Aug 21, 2021, 2:30 PM MDT (20:30 UTC)
- Expired
- Aug 21, 2021, 3:15 PM MDT
- In force
- 45 min
- Issued by
- NWS Pocatello, ID
- Hail
- 0.75 in
- Wind
- 50
County Franklin County, ID
The radar
The Salt Lake City radar (KMTX), 116 km from the middle of the area, began a volume at 20:34 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 8.5 hours before the alert went out and 160 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
- 77 J/kg
- Mixed-layer CIN
- -271 J/kg
- Mixed-layer LCL
- 2167 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 239 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Aug 21, 2:23 PM MDT, 7 minutes earlier.
Area forecast discussion, Aug 21, 2:23 PM MDT, 7 minutes before
Area Forecast Discussion National Weather Service Pocatello ID 223 PM MDT Sat Aug 21 2021 .SHORT TERM...Tonight through Mon night. Showers and thunderstorms until late tonight with a frontal passage during the late evening. We are still in an area of a marginal threat for thunderstorms. Strongest thunderstorms if you believe the HRRR are tonight around 2100-2200 MDT in the Snake River plain, so an uneasy and unsettled night weather-wise. The front will continue its eastward trek Sun and poses a thunderstorm threat only over the ID-WY border. By Mon, skies will clear and the temperature will be up 5 to 10 degrees for afternoon highs after a seasonally cool overnight. Warming trend continues into the extended. With the upper level ridge returning, wind will calm down Sun but get breezy again Mon afternoon. Messick .LONG TERM...Tuesday through Saturday. Through the entire extended period Idaho is under a trof. Occasion short waves will move through the westerly flow, which will likely becmome more northwesterly as the week progresses. Timing of these short waves seems moot at this point, because they will be glancing blows to the north resulting in little to no threat of precipitation to Idaho through the period. Temperatures starting out relatively cool will finally push to normal levels by about Thursday. Deterministic GFS/ECMWF both show significant wave moving through next Saturday. While this still may be too far east to provide any wx, it should help keep temperatures from getting too warm. Crawford && .AVIATION... Scatteered light shower activity affecting various parts of the basin at this time, but some thunderstorms have already fired up over the favored southeastern Idaho area. Showers are featured as predominant wx at all TAFs this evening with the exception of SUN where they become less likely as system swings through from west to east tonight. Moisture will be deepest over the eastern highlands overnight, with some signifncant rains expected there. Thus have kept previous TAF depiction of MVFR cigs at DIJ after 05Z. Most areas will be clear and dry before 12Z with VFR outlook for Sunday. Only DIJ may still have some low level clouds to clear out first thing after sunrise before going SKC. Crawford && .FIRE WEATHER...Thunderstorms continue late tonight, some of them strong to severe in outflow wind with areas of heavy rain possible. Humid conditions will continue tonight and partially into Sun, but really dry air starts entering the Salmon-Challis NF and other Central Idaho Dispatch areas by then. This will spread to the southeast by Mon, with a few low elevations returning to below 15 percent. Mon is expected to see a return to gusty wind, so depending on fuels, there may be some critical fire weather conditions as early as that day. Lows continue to track through southern Canada during the upcoming week, not enough to bring any showers or thunderstorms except to perhaps the Targhee NF and northern end of the Idaho Falls BLM. The main benefit is that temperatures do not get really hot again until just beyond the upcoming 7 day period. The drawback is that these lows will bring breezy conditions while the landscape gets a chance to dry out. Messick .PIH WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 11 PM MDT this evening for IDZ422-425-427. &&
In the hours before
Special weather statement, Aug 21, 12:46 PM MDT, 1 hour 44 minutes before
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</html>Special weather statement, Aug 21, 2:30 PM MDT, 0 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 |
|---|---|---|---|---|
| Aug 21, 12:46 PM MDT | Special Weather Statement | PIH | Bear Lake | 89 min |
| Aug 21, 3:05 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bear Lake, Caribou, Franklin | 29 min |
| Aug 21, 3:10 PM MDT | Special Weather Statement | PIH | Custer | 95 min |
| Aug 21, 3:28 PM MDT | Special Weather Statement | PIH | Oneida | 32 min |
| Aug 21, 4:11 PM MDT | Special Weather Statement | PIH | Franklin | 34 min |
| Aug 21, 4:23 PM MDT | Special Weather Statement | PIH | Custer | 97 min |
| Aug 21, 4:51 PM MDT | Special Weather Statement | PIH | Custer | 24 min |
| Aug 21, 4:52 PM MDT | Special Weather Statement | PIH | Caribou | 38 min |
Nearby
Special Weather Statements in Idaho, 2021Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.