Flood Watch 2, NWS Missoula, MT

408 
WGUS65 KMSO 291834
FFAMSO

Flood Watch
National Weather Service Missoula MT
1134 AM PDT Mon Jun 29 2020

IDZ005>008-MTZ002>007-043-011200-
/O.CON.KMSO.FA.A.0002.000000T0000Z-200701T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-Lower Hells Canyon/Salmon River Region-
West Glacier Region-Flathead/Mission Valleys-Lower Clark Fork Region-
Missoula/Bitterroot Valleys-Bitterroot/Sapphire Mountains-
Butte/Blackfoot Region-Potomac/Seeley Lake Region-
1134 AM PDT Mon Jun 29 2020

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TUESDAY NIGHT...

The Flood Watch continues for

* Portions of Idaho and Montana, including the following areas, in 
  Idaho, Lower Hells Canyon/Salmon River Region, Northern Clearwater 
  Mountains, Orofino/Grangeville Region and Southern Clearwater 
  Mountains. In Montana, Bitterroot/Sapphire Mountains, 
  Butte/Blackfoot Region, Flathead/Mission Valleys, Lower Clark Fork 
  Region, Missoula/Bitterroot Valleys, Potomac/Seeley Lake Region 
  and West Glacier Region.

* Through late Tuesday night

* Small streams in the watch area will be running high and fast into 
  the middle of this week due to heavy rainfall across the area. The 
  threat of sudden flooding near creeks and over roads due to debris 
  blocking culverts is increasing. Rock and mudslide potential in 
  the canyons of north central Idaho and steeper terrain in west 
  central Montana is also high.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on 
current forecasts. You should monitor later forecasts and be alert 
for possible flood warnings. Those living in areas prone to flooding 
should be prepared to take action should flooding develop.

&&

$$

103 
WGUS65 KMSO 301945
FFAMSO

Flood Watch
National Weather Service Missoula MT
1245 PM PDT Tue Jun 30 2020

IDZ005>008-MTZ004>007-043-302045-
/O.CAN.KMSO.FA.A.0002.000000T0000Z-200701T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Northern Clearwater Mountains-Southern Clearwater Mountains-
Orofino/Grangeville Region-Lower Hells Canyon/Salmon River Region-
Lower Clark Fork Region-Missoula/Bitterroot Valleys-
Bitterroot/Sapphire Mountains-Butte/Blackfoot Region-Potomac/Seeley
Lake Region-
1245 PM PDT Tue Jun 30 2020

...FLOOD WATCH IS CANCELLED...

The Flood Watch for portions of Idaho and west central Montana, 
including the following areas, in Idaho, Lower Hells Canyon/Salmon 
River Region, Northern Clearwater Mountains, Orofino/Grangeville 
Region and Southern Clearwater Mountains. In west central Montana, 
Bitterroot/Sapphire Mountains, Butte/Blackfoot Region, Lower Clark 
Fork Region, Missoula/Bitterroot Valleys and Potomac/Seeley Lake 
Region has been cancelled.

The Flood Watch is cancelled.

$$

MTZ002-003-011200-
/O.CON.KMSO.FA.A.0002.000000T0000Z-200701T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
West Glacier Region-Flathead/Mission Valleys-
1245 PM PDT Tue Jun 30 2020

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

The Flood Watch continues for

* A portion of northwest Montana, including the following areas, 
  Flathead/Mission Valleys and West Glacier Region.

* Through late tonight

* Slow moving showers and thunderstorms will bring the potential for 
  heavy rain, which may cause creeks to overflow their banks. Rock 
  and mudslides are possible in steeper terrain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on 
current forecasts. You should monitor later forecasts and be alert 
for possible flood warnings. Those living in areas prone to flooding 
should be prepared to take action should flooding develop.

&&

$$

jk

495 
WGUS65 KMSO 010359
FFAMSO

Flood Watch
National Weather Service Missoula MT
959 PM MDT Tue Jun 30 2020

MTZ002-003-010500-
/O.CAN.KMSO.FA.A.0002.000000T0000Z-200701T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
West Glacier Region-Flathead/Mission Valleys-
959 PM MDT Tue Jun 30 2020

...FLOOD WATCH IS CANCELLED...

The Flood Watch for a portion of northwest Montana, including the 
following areas, Flathead/Mission Valleys and West Glacier Region 
has been cancelled.

The Flood Watch is cancelled. Flooding is no longer expected to pose 
a threat.

$$

Area Forecast Discussion
National Weather Service Missoula MT
436 AM MDT Sat Jun 27 2020

.DISCUSSION...

Southwest flow will intensify over the Northern Rockies today,
creating gusty surface winds, showers, and thunderstorms. Some of
the thunderstorms that develop across Lemhi County and southwest
Montana today will be capable of producing strong wind gusts and
hail, as well as heavy rain and frequent cloud-to-ground
lightning. Even in the absence of rain showers, wind gusts to 30
mph will be common across the region. Also, temperatures this
afternoon will be noticeably cooler than recent days.

Sunday through Monday, a broad low pressure circulation is
anticipated to move over the Northern Rockies from the northwest.
This low pressure circulation is projected to coincide with a very
moist airmass, with significant rainfall potential throughout the
region. Rainfall expectations continue to trend upward, with some
high elevations forecast to receive more than 2 inches rainfall.
Even valley locations (outside of far northwest Montana) are
projected to receive more than 1 inch rain accumulation during
this time. The relatively cold air associated with the low
pressure will also drive snow levels down to 8000 feet, with
mountain peaks experiencing significant snow accumulations. Even
aside from the presence of snow, cold rain will be a hypothermia
threat for those traveling in the backcountry late this weekend
through early next week.

Tuesday, the low pressure circulation is expected wobble around
the Northern Rockies before ejecting straight east over the
Continental Divide. Further rain accumulations will be much less
than Sunday-Monday period. However, area streams and rivers are
anticipated to begin rising fairly rapidly in response to the
previous precipitation. There is some evidence that the Clark Fork
River will have the most significant response among mainstem
rivers, with minor flooding possible by midweek.

Southwest flow aloft quickly returns to the Northern Rockies
on Wednesday, with a resumption of thunderstorm activity each
afternoon and evening through Friday. Relatively cool daytime
temperatures are expected to persist throughout next week.

Some extended range global models suggest that yet another closed
low pressure circulation could descend on the Northern Rockies
sometime near Independence Day. Other models depict a trough of
low pressure parking along the Pacific Northwest coast and
maintaining southwesterly flow (favorable for thunderstorms) over
the Northern Rockies beyond the 6-10 day period. Either way, the
pattern will remain active.

&&

.AVIATION...Clouds and precipitation, along with terrain
obscurations, will increase across the Northern Rockies air space
during the next 24 hours. 27/1800Z to 28/0200Z, surface winds
will gust over 30 knots at times, particularly near the
Continental Divide. Additionally, thunderstorms will be present
mainly from 27/2000Z through 28/0300Z. KBTM and KSMN have a
reasonable chance of a thunderstorm passing within 10 miles of
the airfield during this time. Ceilings will continue to lower
after 28/0300Z, with widespread rainfall present by Sunday
morning.

&&

.MSO WATCHES/WARNINGS/ADVISORIES...
MT...None.
ID...None.
&&