Area forecast discussion
National Weather Service Pocatello Idaho
218 PM MDT Wednesday Jun 19 2013
Discussion...the deep upper low over the Pacific northwest is responsible
for showers and thunderstorms across the forecast area this afternoon. Precipitation will
be most concentrated over the central mountains through this evening. Showers
and thunderstorms are expected to come to an end over the Snake River
Plain and southern Highlands by evening. Strong SW winds will
continue into the evening hours...so will continue the Wind Advisory.
The upper low will move to north central Idaho this evening...and
remain there through Friday. Temperatures will stay on the cool side through
Saturday. Precipitation should be limited to the central mountains and along
The Divide through Saturday...with the greatest coverage during the
afternoon. The rest of the forecast area will remain dry.
Upper ridging replaces the upper low by Saturday night...and will
dry out all areas for Sunday. A minor upper trough will move into
the Pacific northwest on Sunday...and will spread precipitation into the central
mountains Sun afternoon. This trough is followed quickly by another one on
Monday. Will keep the threat of showers over the northern parts of
the forecast area through Wednesday. Hedges
&&
Aviation...a low pressure system shifting inland today has produced
breezy winds across much of the area. Scattered showers and isolated
thunderstorms are beginning to pop and will remain active through 8
PM, impacts anticipated at terminal locations include gusty winds
to 40kts...brief heavy rains...lightning and possible some pea sized
hail along with brief periods of MVFR for lowering ceilings. The
thunderstorm activity will diminish after 8 PM MDT this evening as
the upper low advances into the Idaho Panhandle and southern Idaho
remains on the southern periphery of the main shower activity.
Preston
&&
Fire weather...a low pressure system has begun pressing eastward
this afternoon centered near Pendleton Oregon. Atmospheric
instability has increase enough to produce scattered thunderstorms
across much of the area and expect that to continue until 8 PM
cooler temperatures and locally breezy conditions lingering through
the rest of the week before the low finally pushes east into the
Dakotas Saturday into Sunday. A second low pressure system is
expected to advance into the northwest coastal waters Sunday with ejecting
disturbances posing a threat for renewed showers and cooler
temperatures early next week. Huston/Preston
&&
Pih watches/warnings/advisories...
Wind Advisory until 9 PM MDT this evening idz020-021.
&&
$$
