Alert archive / Montana / Flash Flood Watches in 2012
Flash Flood Watch 2, NWS Missoula, MT
NWS Missoula, MT issued this flash flood watch at Jul 16, 2012, 3:04 PM MDT for 9 counties in Montana; Clearwater County, Idaho County, Idaho. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2012, 3:04 PM MDT (21:04 UTC)
- Expired
- Jul 16, 2012, 8:27 PM MDT
- In force
- 5 hr
- Issued by
- NWS Missoula, MT
- Flood severity
- None
Counties Clearwater County, ID, Idaho County, ID, Deer Lodge County, MT, Granite County, MT, Lake County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 43 km from the middle of the area, began a volume at 21:06 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, 9.1 hours before the alert went out and 206 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
- 136 J/kg
- Mixed-layer CIN
- -116 J/kg
- Mixed-layer LCL
- 888 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 295 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
615 WGUS65 KMSO 162104 FFAMSO URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MISSOULA MT 304 PM MDT MON JUL 16 2012 IDC035-049-MTC023-039-047-061-063-077-081-089-093-170515- /O.NEW.KMSO.FF.A.0002.120716T2104Z-120717T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLEARWATER-IDAHO-DEER LODGE-GRANITE-LAKE-MINERAL-MISSOULA-POWELL- RAVALLI-SANDERS-SILVER BOW- 304 PM MDT MON JUL 16 2012 /204 PM PDT MON JUL 16 2012/ ...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT MDT /11 PM PDT/ TONIGHT... THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTH CENTRAL IDAHO AND MONTANA...INCLUDING THE FOLLOWING COUNTIES...IN NORTH CENTRAL IDAHO...CLEARWATER AND IDAHO. IN MONTANA...DEER LODGE... GRANITE...LAKE...MINERAL...MISSOULA...POWELL...RAVALLI... SANDERS AND SILVER BOW. * UNTIL MIDNIGHT MDT /11 PM PDT/ TONIGHT * MONSOONAL MOISTURE CONTINUES TO STREAM INTO THE NORTHERN ROCKIES THIS AFTERNOON AND EVENING. SLOW MOVING SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER THE REGION AND WILL MOVE NORTHWARD THIS EVENING. THESE STORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN. RAINFALL RATES OVER AN INCH AN HOUR ARE POSSIBLE WITH THESE STORMS. * THE HEAVY RAIN COULD CAUSE FLOODING...BUT ALSO ROCK AND MUD SLIDES IN THE HIGHER TERRAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
1 follow-up statement
066 WGUS65 KMSO 170227 AAA FFAMSO FLOOD WATCH...UPDATED NATIONAL WEATHER SERVICE MISSOULA MT 827 PM MDT MON JUL 16 2012 IDC035-049-MTC023-039-047-061-063-077-081-089-093-170330- /O.CAN.KMSO.FF.A.0002.000000T0000Z-120717T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CLEARWATER-IDAHO-DEER LODGE-GRANITE-LAKE-MINERAL-MISSOULA-POWELL- RAVALLI-SANDERS-SILVER BOW- 825 PM MDT MON JUL 16 2012 /725 PM PDT MON JUL 16 2012/ ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTH CENTRAL IDAHO AND MONTANA HAS BEEN CANCELLED. SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE TONIGHT AND COULD BE HEAVY AT TIMES...BUT THE MAIN THREAT FOR FLASH FLOODING HAS DIMINISHED. $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 2:42 PM MDT | Flash Flood Warning | MSO | Silver Bow | 93 min |
| Jul 16, 3:08 PM MDT | Flash Flood Warning | MSO | Granite, Ravalli | 112 min |
| Jul 16, 2:27 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 33 min |
| Jul 16, 4:29 PM MDT | Special Weather Statement | MSO | Clearwater | 46 min |
Nearby
Flash Flood Watches in Montana, 2012Flash Flood Watches in Idaho, 2012Every flash flood watch in 2012
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.