Alert archive / Montana / Flood Watches in 2018
Flood Watch 8, NWS Missoula, MT
NWS Missoula, MT issued this flood watch at May 23, 2018, 9:34 AM MDT for 5 counties in Montana. It was in force for 4 days.
The area
The counties it named.
The facts
- Issued
- May 23, 2018, 9:34 AM MDT (15:34 UTC)
- Expired
- May 27, 2018, 11:04 AM MDT
- In force
- 4 days
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Flathead County, MT, Lake County, MT, Missoula County, MT, Ravalli County, MT, Sanders County, MT
The radar
The Missoula radar (KMSX), 40 km from the middle of the area, began a volume at 15:38 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
Spokane, WA (KOTX), launched 12:00Z, 3.6 hours before the alert went out and 165 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
- 78 J/kg
- Mixed-layer CIN
- -165 J/kg
- Mixed-layer LCL
- 1873 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this flood watch went out at May 23, 4:17 AM MDT, 5 hours 17 minutes earlier.
Area forecast discussion, May 23, 4:17 AM MDT, 5 hours 17 minutes before
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</html>The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 9:26 AM MDT | Areal Flood Warning | MSO | Sanders | 8 days |
| May 23, 9:45 AM MDT | Areal Flood Warning | MSO | Mineral, Missoula | 5 days |
| May 23, 4:29 PM MDT | Special Weather Statement | MSO | Ravalli | 31 min |
| May 22, 6:23 PM MDT | Special Weather Statement | MSO | Idaho | 37 min |
| May 23, 4:27 PM MDT | Special Weather Statement | MSO | Lewis | 18 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.