Alert archive / Idaho / Winter Weather Advisories in 2019

Winter Weather Advisory 21, NWS Pocatello, ID

October 28, 201915 counties in Idaho

NWS Pocatello, ID issued this winter weather advisory at Oct 28, 2019, 1:56 PM MDT for 15 counties in Idaho. It took effect at Oct 28, 2019, 6:00 PM MDT. It was in force for 19 hr.

The area

The counties it named.

The facts

Issued
Oct 28, 2019, 1:56 PM MDT (19:56 UTC)
In effect from
Oct 28, 2019, 6:00 PM MDT
Expired
Oct 29, 2019, 1:23 PM MDT
In force
19 hr
Issued by
NWS Pocatello, ID

Counties Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Blaine County, ID, Bonneville County, ID, Caribou County, ID, Cassia County, ID, Franklin County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Power County, ID, Teton County, ID

The radar

The Pocatello radar (KSFX), 34 km from the middle of the area, began a volume at 19:57 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.9 hours before the alert went out and 315 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2019-10-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2019-10-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1334 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pocatello, ID wrote its last area forecast discussion before this winter weather advisory went out at Oct 28, 2:13 AM MDT, 11 hours 43 minutes earlier.

Area forecast discussion, Oct 28, 2:13 AM MDT, 11 hours 43 minutes before
Area Forecast Discussion
National Weather Service Pocatello ID
213 AM MDT Mon Oct 28 2019

.SHORT TERM...Today through Wednesday.
An arctic cold front will slide south through Idaho this afternoon
through tonight. It will have light snow with it with some
accumulations possible this afternoon through Tuesday of 2 to 4
inches in the eastern highlands with possible an inch or so in the
Snake River Plain. Breezy southwest winds are expected today ahead
of the front in the Snake Plain and southern highlands with 20 to
25 mph winds expected. Winds will turn to the north behind the
arctic front tonight and many areas could see the northerly winds
in the 15 to 20 mph range overnight tonight. Very cold wind chills
will be present in the Upper Snake Highlands. Do not think amounts
of snow widespread enough to warrant a winter weather advisory but
do expect some difficult travel conditions from late this
afternoon through Tuesday morning. Beginning near the Montana
border this afternoon and spreading quickly south overnight
tonight. Extremely cold temperatures will continue through the
entire short term period with Tuesday the coldest day with high
temperatures 25 to 30 degrees below normal. Many areas will drop
to zero or even below zero Wednesday morning.
GK

.LONG TERM...Thursday through next Monday.
Expect dry conditions with a warming trend in the long term period
with temperatures getting near seasonal normals by Sunday and
Monday.
GK

&&

.AVIATION...Expect light winds with some high clouds drifting
through the region this morning. Ceilings will begin to lower this
afternoon, although remaining vfr. Winds will increase this
afternoon with gusts to 25kts possible for some. Conditions will
gradually deteriorate tonight with snow showers moving through the
region. IFR or MVFR conditions possible near snow showers.

Valle

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.
&&

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 28, 2:28 PM MDTWind Chill WarningPIHButte, Clark, Fremont, Teton21 hr

Nearby

Winter Weather Advisories in Idaho, 2019Every winter weather advisory in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.