Alert archive / Idaho / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 656
The Storm Prediction Center issued this severe thunderstorm watch at Jul 19, 2004, 4:15 PM MDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2004, 4:15 PM MDT (22:15 UTC)
- Expired
- Jul 19, 2004, 11:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Adams County, ID, Benewah County, ID, Clearwater County, ID, Gem County, ID, Idaho County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Shoshone County, ID, Valley County, ID, Washington County, ID, Mineral County, MT, Sanders County, MT, Baker County, OR, Grant County, OR, Harney County, OR, Morrow County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wheeler County, OR, Asotin County, WA, Columbia County, WA, Garfield County, WA, Walla Walla County, WA, Whitman County, WA
The radar
The Pendleton radar (KPDT), 80 km from the middle of the area, began a volume at 22:14 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.
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 4:41 PM MDT | Severe Thunderstorm Warning | PDT | Union | 64 min |
| Jul 19, 4:43 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 62 min |
| Jul 19, 5:04 PM MDT | Severe Thunderstorm Warning | BOI | Adams | 26 min |
| Jul 19, 5:20 PM MDT | Severe Thunderstorm Warning | BOI | Canyon, Payette | 40 min |
| Jul 19, 5:44 PM MDT | Severe Thunderstorm Warning | PDT | Union | 61 min |
| Jul 19, 6:07 PM MDT | Severe Thunderstorm Warning | PDT | Wallowa | 53 min |
| Jul 19, 6:33 PM MDT | Severe Thunderstorm Warning | BOI | Baker | 57 min |
| Jul 19, 6:38 PM MDT | Flash Flood Warning | BOI | Baker | 2 hr |
| Jul 19, 6:43 PM MDT | Severe Thunderstorm Warning | BOI | Baker | 47 min |
| Jul 19, 6:48 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 57 min |
| Jul 19, 8:04 PM MDT | Tornado Warning | OTX | Lewis | 26 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 10.3 hours before the alert went out and 241 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
- 73 J/kg
- Mixed-layer CIN
- -283 J/kg
- Mixed-layer LCL
- 1998 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 12:16 PM MDT | Mesoscale Discussion | SPC | Bonner, Clearwater, Idaho, Shoshone | 2 hr |
| Jul 19, 3:49 PM MDT | Mesoscale Discussion | SPC | Benewah, Clearwater, Latah, Lewis, Nez Perce, Shoshone | 2 hr |
Nearby
Severe Thunderstorm Watches in Idaho, 2004Severe Thunderstorm Watches in Oregon, 2004Severe Thunderstorm Watches in Washington, 2004Every severe thunderstorm watch in 2004
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.