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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Wednesday
• 
• High: 68 °
• Low: 39 °
• Chance of a Thunderstorm

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

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

• Saturday
• 
• High: 75 °
• Low: 45 °
• Partly Cloudy

• Sunday
• 
• High: 77 °
• Low: 45 °
• Mostly Cloudy

Area forecast discussion...updated 
National Weather Service Pocatello Idaho 
628 am MDT Wednesday may 22 2013 


Update...we went ahead and started the lake Wind Advisory now as 
winds are already hitting the low end thresholds for this impact. Keyes 


&& 




Previous discussion... /issued 327 am MDT Wednesday may 22 2013/ 


Discussion...a closed low continues to basically sit and spin 
along the West Coast...occasionally sending waves of energy around 
it across Idaho. There is also a lot of dry air embedded within 
this storm. This will lead to some areas getting a better chance 
of showers and storms followed by a quick end to things. For 
today...favored development will be across portions of the central 
and eastern mountains by afternoon. A cold front will continue to 
push out of the area...with gusty south/southeast winds ahead of 
it and southwest to northwest behind it. 15-25 miles per hour winds with 
higher gusts will be common especially behind the front. This will 
cause of bigger waves on American Falls Reservoir...so we have a 
lake Wind Advisory out from middle morning until sunset. While no 
severe storms are expected we could see some gusty winds and/or 
small hail with stronger activity. The highest instability is 
forecast to be in the eastern mountains so that would be the most 
likely place for strong storms. Highs today will actually just a 
bit below average for late may...50 and 60s for the valleys. Some 
light and wet snow is possible generally above 7000ft today but 
should not amount to much and likely melt on impact during 
daylight hours. For tonight...the models are consistent with 
developing a band of showers and evening storms across the eastern 
ranges of the central mountains southward to the Utah border. 
Other activity is expected to continue farther east with a low 
chance even across the snake plain. This band will shift northward 
tonight and by morning there will be only a slight chance of 
showers closer to The Divide. Snow levels will be in the 
6500-8000ft range overnight so anywhere form a trace to a couple 
of inches will be possible across the central mountains. It will 
melt after sunrise tomorrow. For Thursday and Friday...the low 
will send another impulse through and then the whole system will 
begin to lift northeast by Friday. A chance of showers and storms 
will persist across the western half of the forecast area and 
upper snake Highlands Thursday...then mainly across the 
central/northern mountains Friday. It will be occasionally breezy 
during the period and highs will remain at or just below average 
through this period. Lows will be in the 30s and low 40s for the 
lower valleys...but we should stay away from frost/freeze issues 
it appears. 


Looking ahead to the Holiday weekend through early next week...it 
will remain unsettled across the area. There will be a chance of 
showers and storms remaining across northern and western portions 
of the forecast area through Sunday. This is in response to southwest 
flow ahead of the next storm which finally moves into the area by 
Memorial Day. The models are not quite agreeing with how far south 
to bring the main storm as it crosses the state. For now...we are 
maintaining a chance of precipitation everywhere with higher 
probabilities across the north. It will be warmer into early next 
with highs in the 70s to near for the lower valleys. The higher 
valleys and mountains should be in the 50s and 60s for the most 
part. Do be prepared for some colder mornings in higher terrain especially 
across central mountains. Keyes 


Aviation...cold front working across eastern Idaho early this 
morning. Showers have developed along the cold front and will 
continue to shift east with the front into Wyoming through the 
morning then redevelop this afternoon and evening mainly north of a 
line from ksun to krxe. Conditions will remain mainly VFR with these 
showers...though some of the higher elevation areas may see MVFR 
ceilings. Gusty winds are expected to redevelop behind the front 
through today with gusts reaching 25-30kts in some areas. 
Improvement in wind speeds is expected this evening as the surface 
flow turns to the northwest and the gradient slackens. Dmh 


Fire weather...a deep Pacific low will remain centered over 
Oregon/Washington for the next several days. Passage of a cold front 
this morning will bring showers and thunderstorms to eastern Idaho 
today along with gusty winds. Showers and thunderstorms will 
continue into Thursday and Friday mainly over higher elevation 
areas. The upper low is expected to lift out of the region by 
Saturday...but another system will arrive quickly behind it for 
Sunday into Monday. Dmh 


&& 


Pih watches/warnings/advisories... 
lake Wind Advisory until 9 PM MDT this evening idz021. 


&& 


$$