Area Forecast Discussion
Issued by NWS Boise, ID

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

FXUS65 KBOI 240943

Area Forecast Discussion
National Weather Service Boise ID
343 AM MDT Mon Jul 24 2017

.SHORT TERM...Today through Tuesday...Upper level low off the
northern California Coast is bringing southerly flow over the
region today with a significant increase in moisture. Moisture
should really increase today and by this afternoon scattered
showers and thunderstorms will develop across much of the
forecast area. Still better chances in the south, and less in the
north, because westerly flow across northern Idaho and Montana,
following a wave moving through Alberta, will limit how far north
moisture can go. Temperatures will be tricky with some residual
cloud cover from convection last night over Oregon hanging around
this morning. But believe that by afternoon, sunshine will
prevail, and along with warm airmass in the southerly flow, most
areas should reach temperatures nearly the same as on Sunday. More
moisture streams in on Tuesday, continuing the thunderstorm
threat. Cooled the temperatures for Tuesday slightly due to even
more cloud cover around from storms.

.LONG TERM...Tuesday night through Sunday...An upper trough in
northern California Tuesday night will track E-NE across southern
Oregon and Idaho through Wednesday night. Moisture and instability
ahead of the trough will bring continued chances for showers and
thunderstorms. The stronger afternoon and evening storms will be
capable of producing heavy rain and gusty winds due to high
precipitable water values and hot temperatures. Nocturnal
thunderstorms are also possible due to the enhanced convective
potential with the trough. Temperatures will be slightly above
normal. Drier air will follow the departing trough on Thursday,
along with warmer temperatures through next weekend as the ridge
over the Four Corners expands northward. Valley highs are expected
to be around 100F in the lower valleys Friday through Sunday.

.AVIATION...Widespread VFR. Isolated showers and thunderstorms
across SE Oregon and near the ID/NV border until 18Z. Showers and
thunderstorms will increase in coverage after 18Z, becoming
scattered in most of SE Oregon (south of KBKE) and south of the
Snake Plain in Idaho. Variable surface winds up to 10 kts, except
gusts to 40 kts near thunderstorms. Winds aloft near 10k ft MSL:
Variable to 15 kts.

ID...Red Flag Warning from noon today to midnight MDT tonight
OR...Red Flag Warning from noon MDT /11 AM PDT/ today to midnight MDT
     /11 PM PDT/ tonight ORZ636-637.



AVIATION.....BW is the U.S. government's official web portal to all federal, state and local government web resources and services.