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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 68 °
• Low: 37 °
• T-Storms

• Thursday
• 
• High: 63 °
• Low: 37 °
• Chance of Rain

• Friday
• 
• High: 66 °
• Low: 34 °
• T-Storms

• Saturday
• 
• High: 70 °
• Low: 37 °
• Partly Cloudy

• Sunday
• 
• High: 79 °
• Low: 48 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Pocatello Idaho 
947 PM MDT Tuesday Jun 18 2013 


Update...areas of blowing dust developed this evening near 
Mountain Home with winds gusting up to 56 miles per hour. Winds have slowed 
down some the past hour but the 00z nam12 model suggest boundary 
layer winds of 35 to 40 kts over western Cassia County between 
midnight and about 8 am Wednesday. The west wind direction is 
often favorable for strong winds to channel through the terrain 
and be felt on Interstate 84 between Idahome and the Interstate 86 
Junction. Issued a Wind Advisory for the over night hours. 
Also...dropped thunderstorms from the forecast the rest of tonight 
along the Idaho and Wyoming border. Receiver station 


&& 


Previous discussion... /issued 154 PM MDT Tuesday Jun 18 2013/ 


... Deep upper low will move into the Pacific northwest tonight 
and bring a significant change to the forecast area Wednesday through Friday. 
Showers and a few thunderstorms will develop this afternoon over the central 
mountains and become more widespread overnight. A cold front is 
expected to pass through easteren Idaho by late Wednesday morning. This will 
bring in much cooler air along with strong winds for Wednesday afternoon and 
evening. NAM guidance pushes winds into the advisory level...while the 
GFS falls short. Based on the strength of the upper winds and the 
cold advection...will go ahead with a Wind Advisory for the middle 
and upper snake plain. 


Showers and thunderstorms will continue over the northern mountains into Wednesday 
evening. Precipitation amounts may be high enough to cause some problems in 
the burn areas in northern Custer Colorado. Isolated showers and thunderstorms may 
pop up Wednesday afternoon/evening over the southern Highlands. At this time... 
it looks like the snake plain/eastern Magic Valley will remain 
dry. Precipitation will taper off overnight Wednesday as the upper low moves 
slowly to the east. Scattered showers will linger over the 
northern mountains into Friday as the upper low takes its time moving out 
of Idaho. The NAM moves the low out much sooner...but the GFS and the 
European model (ecmwf) say otherwise. A minor upper ridge moves into the Pacific northwest by 
Sat evening...and remains into Sunday before flattening into more 
zonal flow. This will result in dry condtions and warmer temperatures Sat 
and sun...but the zonal flow should bring in Pacific moisture. This 
will increast the chances for precipitation Monday through Tuesday in the central 
mountains hedges 


Aviation...VFR conditions will prevail into this evening. Expect 
isolated pockets of late afternoon high-based convection over higher 
terrain...and wind gusts may again be erratic and strong with 
potential for localized gusts up to 40kts. Moisture moves into the 
central mountains tonight as a cold front crosses the region 
overnight with some pockets of MVFR. Most likely area for 
precipitation will be in the central mountains after 06z. Dsh 


Fire weather... 
fire weather...pacnw upper low moves further inland tonight into 
Wednesday. Pockets of dry convection possible late this afternoon 
over higher elevations. A cold front slides across the region 
overnight...with the potential for significant precipitation in the central 
mountains late tonight into Wednesday. Strong winds will develop on 
Wednesday and much cooler temperatures and a corresponding rise in 
daytime humidity. Dsh 


&& 


Pih watches/warnings/advisories... 
Wind Advisory from noon to 9 PM MDT Wednesday idz020-021. 


Wind Advisory until 9 am MDT Wednesday idz022. 


&& 


$$