Severe Thunderstorm Warning 49, NWS Pocatello, ID

156 
WWUS55 KPIH 192321
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
521 PM MDT Sat Sep 19 2020

IDC011-019-043-051-065-192345-
/O.CON.KPIH.SV.W.0049.000000T0000Z-200919T2345Z/
Fremont ID-Jefferson ID-Bonneville ID-Madison ID-Bingham ID-
521 PM MDT Sat Sep 19 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR SOUTHWESTERN FREMONT...EASTERN JEFFERSON...NORTH CENTRAL
BONNEVILLE...WESTERN MADISON AND EAST CENTRAL BINGHAM COUNTIES...

At 520 PM MDT, severe thunderstorms were located along a line
extending from near Hamer to near Rose, moving northeast at 20 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Idaho Falls, Rexburg, Rigby, Lorenzo, Goshen, Ririe Reservoir, Ammon,
Shelley, Iona, Sugar City, Ucon, Menan, Ririe, Roberts, Lewisville,
Parker, Archer, Egin, Bone and Plano.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4314 11217 4398 11218 4403 11174 4320 11175
TIME...MOT...LOC 2320Z 230DEG 11KT 4394 11216 4325 11226 

HAIL...1.00IN
WIND...70MPH
 
$$

ND

Area Forecast Discussion
National Weather Service Pocatello ID
145 PM MDT Sat Sep 19 2020

.SHORT TERM...Rest of Tonight...Isolated Showers and
thunderstorms have already developed over the Central Mountains
this afternoon while the earlier line of showers from this
morning exits into western Wyoming. Several short term models show
a developing line of showers/thunderstorms during the mid-
afternoon hours across the Arco Desert/Upper Snake River Plain
tracking southeastward across the I-15 corridor and Idaho Falls to
Rexburg. Within the organized line would be the potential for
small hail and gusty winds while it continues it trek toward the
Teton Valley early this evening. Out ahead of this line, isolated
thunderstorms are possible this afternoon as well, including the
southern highland areas all the way to eastward to Bear Lake.
Eastern Magic Valley area and South Hills areas area least likely
to see thunderstorm develop but are expected to see gusty west or
northwest winds. Improvement to wind speeds and decreasing chances
of thunderstorms are forecast between 8 pm and 10 pm.

.Sunday through Tuesday...Zonal flow will allow for mild
temperatures and generally light winds this forecast period. A
ridge of high pressure begins to build back into the area from the
south by Monday, which will shift our winds back from the
southwest and begin to increase temperatures slightly. This time
period is expected to be precipitation free.
ND

LONG TERM...Tuesday through Saturday.
A weak system will pass east south of Idaho but expect a chance of
showers and thunderstorms in the far eastern part of the state near
the Wyoming border.  Will be dry Wednesday and Thursday with the
chance of showers returning mainly to the central mountains and
eastern highlands.  Temperatures will be above normal through
Friday with cooling expected by Saturday as the next system works
east.   Low confidence at the end of the long term period as models
greatly different with GFS slower and wetter and European model
drier and weaker with the end of the week system.  Winds may
increase by Friday into Saturday as well.
GK

&&

.FIRE WEATHER...
Isolated to widely scattered thunderstorms will be possible through
sunset tonight with some breezy conditions as well.   Gusts of 20 to
30 mph will be possible especially in zones 410.  Brunt of
thunderstorm activity will be in zones 475, 476, 422, 410 and 411.
All locations will see at least isolated activity.  Humidity is way
up today and should remain so through Sunday.  Temperatures will
begin to moderate Sunday and remain above normal through next week.
Next chance for showers will be in the far east Tuesday mainly zones
413, 410 and 411.  Could be breezy as well Tuesday but not expecting
highlights as humidity stays above 15 percent.
GK

&&

.AVIATION...Showers and thunderstorms have developed this
afternoon and have vicinity at all sites with SUN, BYi and DIJ
most likely to see on station but can't rule out anywhere. Will
have 10 to 20 knot sustained winds through sunset at all sites
before dying down. Will have clear skies throughout the day Sunday
with up valley 10 to 15 knot afternoon winds at PIH and IDA. GK

&&

.AIR STAGNATION...Air Quality concerns from regional wildfire
smoke look to improve today as a low pressure trough moves through
our area and flow turns more westerly. This essentially 'closes
off' flow from the CA wildfires for the time being. Keep in mind
though that smoke from local wildfires will certainly still impact
the air quality. This pattern of a general westerly flow looks to
continue through Monday before gradually opening back up again
from the southwest.
ND

&&

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
438 PM MDT SAT SEP 19 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0420 PM     TSTM WND GST     9 SSW TERRETON          43.72N 112.53W
09/19/2020  M52 MPH          JEFFERSON          ID   MESONET

            ROVER ARL FRD

&&

GKAISER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
439 PM MDT SAT SEP 19 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 PM     TSTM WND GST     4 SE SOUTHEAST INL      43.55N 112.59W
09/19/2020  M51 MPH          BINGHAM            ID   MESONET

            TELEGRAPH HILL

&&

GKAISER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
445 PM MDT SAT SEP 19 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 PM     TSTM WND GST     12 ESE SOUTHEAST INL    43.55N 112.42W
09/19/2020  M66 MPH          BONNEVILLE         ID   MESONET

            HIGHWAY 20 AT KETTLE BUTTE.

&&

GKAISER

Special Weather Statement
National Weather Service Pocatello ID
449 PM MDT Sat Sep 19 2020

IDZ057>059-062-063-192345-
Franklin/Eastern Oneida Region ID-Marsh and Arbon Highlands ID-
Caribou Range ID-Raft River Region ID-Blackfoot Mountains ID-
449 PM MDT Sat Sep 19 2020

...LINE OF THUNDERSTORMS EXTENDING FROM NEAR CHESTERFIELD RESERVOIR
TO NEAR MALTA MOVING EAST THROUGH 545 PM MDT...

At 447 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Chesterfield Reservoir to 6 miles
southeast of Fort Hall Mount Putnam to 11 miles east of Fort Hall
Bannock Peak to 13 miles east of Malta. Movement was east at 10 mph.

Small hail, moderate rain, frequent lightning, and wind gusts to 45
mph are possible with these storms as they move east through the
Southeast Highlands this evening.

Locations impacted include...
McCammon, Lava Hot Springs, Blackfoot Reservoir, Chesterfield
Reservoir, Inkom, Arimo, Portneuf Gap, Fort Hall Mount Putnam,
Virginia, Henry, Chesterfield, Juniper, Pauline, Cutthroat Trout
Campground, Mink Creek Pass, Sweetzer Summit, Hawkins Reservoir,
Daniels Reservoir, Bancroft and Arbon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4301 11137 4279 11165 4252 11204 4209 11283
      4224 11334 4267 11255 4296 11223 4306 11197
TIME...MOT...LOC 2247Z 281DEG 10KT 4298 11196 4287 11210 4259 11249
4225 11312

Huston

Special Weather Statement
National Weather Service Pocatello ID
450 PM MDT Sat Sep 19 2020

IDZ053-054-058-062-192330-
Upper Snake River Plain ID-Marsh and Arbon Highlands ID-
Blackfoot Mountains ID-Lower Snake River Plain ID-
450 PM MDT Sat Sep 19 2020

...OUTFLOW BOUNDARY TRACKING THROUGH CENTRAL BONNEVILLE AND CENTRAL
BINGHAM COUNTIES UNTIL 530 PM MDT...

At 449 PM MDT, Doppler radar was tracking an outflow boundary from
strong thunderstorms to the north of Blackfoot, moving east around
20 mph.

Wind gusts up to 50 mph will be possible.

Locations impacted include...
Blackfoot, Goshen, Shelley, Firth, Moreland, Rose, Groveland, Basalt
and Wapello.

LAT...LON 4322 11210 4319 11251 4338 11238 4348 11186
TIME...MOT...LOC 2249Z 191DEG 24KT 4335 11232

ND

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
453 PM MDT SAT SEP 19 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 PM     TSTM WND GST     11 W OSGOOD             43.55N 112.33W
09/19/2020  M66 MPH          BONNEVILLE         ID   DEPT OF HIGHWAYS

            ITD KETTLE BUTTE STATION.

&&

ND