Severe Thunderstorm Warning 7, NWS Pendleton, OR

Area Forecast Discussion
National Weather Service Pendleton OR
225 PM PDT Mon Jun 26 2017

.SHORT TERM...Tonight through Thursday. Upper low moving inland
this afternoon with a short wave moving across Oregon. This wave
is currently the focus for showers and thunderstorms moving north
northeast at 25-35 mph. Expect most of the forecast area will be
impacted by showers and storms for the remainder of the afternoon
into the evening. Main threat will be hail, winds and heavy rain.
As the short wave moves off to the north overnight precipitation
will be ending with clearing skies. Moderate surface gradients
with a marine push will create breezy to locally windy conditions
through tonight into Tuesday. For Tuesday a drier westerly flow
aloft with partly to mostly sunny skies. Temperatures will be
about 10 degrees cooler with highs in the 80s. The flow aloft
becomes more northwesterly Wednesday and Thursday with continued
partly cloudy conditions. Temperatures will be closer to normal
levels with highs in the 80s and lows in the 40s and 50s.   94

.LONG TERM...Thursday Night through Monday...An upper level ridge
will build near the coast Thursday night then move inland and weaken
Friday as a short wave dives into MT. This wave will increase sky
cover Friday and Saturday in Wallowa County but precipitation is
expected to remain east of the CWA Friday. A few showers may develop
over the Eagle Caps Saturday afternoon. Another ridge will build
offshore Saturday and then weaken as it moves through WA and OR
Sunday. Temperatures will be nearly steady with highs in the mid 80s
to lower 90s in the lower elevations and mostly 70s to lower 80s
mountains.   Coonfield

&&

.AVIATION...18Z TAFs...A weather system and cold front will move
into the region today bringing scattered showers and
afternoon/evening isolated thunderstorms. This may cause brief MVFR
conditions near and under thunderstorms due to lower cigs and
visibility. Otherwise VFR conditions will prevail during the next 24
hours. While TS are possible at KRDM KBDN KPSC KPDT KALW the
probability remains too low to include in TAF at KRDM and KBDN.
Winds will increase...KDLS now then spreading eastward to the
remaining TAF sites.

&&

.FIRE WEATHER...Thunderstorms developing across the forecast area
are producing frequent lightning. There have also been reports of
heavy downpours and winds gusts as strong as 47 mph.  Red Flag
Warnings are in effect for Fire Zones 640 and 644 which covers the
Prineville District, the Crooked River Grasslands, the John Day
Valley and the Grande Ronde Valley.  Discussing with land management
agencies, even the grassy areas in the Blue Mountains and Wallowa
Mountains could be a concern for fire spread due to new lightning
starts and outflow winds. Storms have developed a little farther west
and north than anticipated along the east slopes of the Oregon
Cascades.  The air mass in our western zones should begin to
stabilize as the westerly flow takes effect, and thunderstorms
should taper off this evening.

Another concern for fire weather are the winds this evening for
areas in and around the Columbia Basin.  The lowest humidity is in
the Hanford District where RHs are in the teens to lower 20s.  Winds
are light at this time in this area but will increase over the next
several hours. The humidity should respond and also increase.
Conditions are borderline for red flag and will continue to
highlight in the forecast.  Wister

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  59  84  54  82 /  40   0   0   0
ALW  63  85  58  83 /  40   0   0   0
PSC  62  89  57  88 /  30   0   0   0
YKM  58  88  54  86 /  30   0   0   0
HRI  61  88  57  86 /  30   0   0   0
ELN  58  83  57  81 /  30   0   0   0
RDM  49  82  42  81 /  10   0   0   0
LGD  56  79  47  78 /  60   0   0   0
GCD  52  83  44  80 /  50   0   0   0
DLS  61  83  57  82 /  30   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Red Flag Warning until 10 PM PDT this evening for ORZ640-644.

WA...None.
&&

94/76/76/85

Special Weather Statement
National Weather Service Pendleton OR
202 PM PDT MON JUN 26 2017

ORZ510-511-262200-
North Central Oregon OR-Central Oregon OR-
202 PM PDT MON JUN 26 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL JEFFERSON AND SOUTH
CENTRAL WASCO COUNTIES UNTIL 300 PM PDT...

At 201 PM PDT, Doppler radar was tracking a strong thunderstorm over
southeastern Warm Springs Reservation, or 18 miles northwest of
Madras, moving north at 10 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Warm Springs Reservation, Simnasho and Warm Springs.

LAT...LON 4507 12148 4507 12136 4508 12139 4509 12138
      4505 12111 4475 12126 4477 12146 4480 12150
TIME...MOT...LOC 2101Z 191DEG 9KT 4484 12137

TWE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OR
208 PM PDT MON JUN 26 2017

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

0124 PM     HEAVY RAIN       3 WSW JOHN DAY          44.41N 119.01W
06/26/2017  M0.55 INCH       GRANT              OR   TRAINED SPOTTER

0200 PM     HAIL             SSW JOHN DAY            44.42N 118.95W
06/26/2017  M0.75 INCH       GRANT              OR   TRAINED SPOTTER

            MOSTLY DIME SIZED WITH A FEW LARGER STONES

0200 PM     HEAVY RAIN       SSW JOHN DAY            44.42N 118.95W
06/26/2017  E1.00 INCH       GRANT              OR   TRAINED SPOTTER

            ESTIMATED 1 INCH OF RAINFALL, 2-3 INCHES OF STANDING
            WATER OUTSIDE THE FEDERAL BUILDING

&&

JPECK

Special Weather Statement
National Weather Service Pendleton OR
212 PM PDT MON JUN 26 2017

ORZ044-049-050-502-503-505-507-262200-
Grande Ronde Valley OR-
Foothills of the Northern Blue Mountains of Oregon OR-
Southern Blue Mountains of Oregon OR-
Northern Blue Mountains of Oregon OR-Wallowa County OR-
Lower Columbia Basin of Oregon OR-John Day Basin OR-
212 PM PDT MON JUN 26 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL UMATILLA...WESTERN UNION
AND NORTHEASTERN GRANT COUNTIES UNTIL 300 PM PDT...

At 206 PM PDT, Doppler radar was tracking strong thunderstorms near
Granite in northeast Grant County, east of Ukiah in southern
Umatilla County, southwest of Pilot Rock in western Umatilla County
and southwest of LaGrande in Union County.

These storms will likely affect the Pilot Rock and LaGrande areas
during the next hour as they move northeast at 20 to 25 mph. Dime
size hail and winds in excess of 40 mph will be possible with this
storm.

Other Locations impacted include... Pendleton, La Grande, John Day,
Meacham, Elgin, Island City, Canyon City, Imbler, Ukiah,
Summerville, Granite, Thorn Hollow, Lehman Hot Springs, Kamela,
Cayuse, Starkey, Minam, Dale, Rieth and Hilgard.

LAT...LON 4441 11897 4438 11900 4575 11919 4568 11756
      4501 11817 4501 11821 4494 11823 4472 11843
      4470 11852 4466 11848 4447 11866 4447 11872
      4442 11872 4439 11883 4440 11888 4437 11894
TIME...MOT...LOC 2106Z 240DEG 25KT 4433 11884

Hull

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OR
223 PM PDT MON JUN 26 2017

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

0223 PM     HAIL             7 N WARM SPRINGS        44.87N 121.29W
06/26/2017  M1.75 INCH       WASCO              OR   PUBLIC

            TRAINED SPOTTER RELAYED REPORT FROM THE PUBLIC OF GOLF
            BALL SIZED HAIL

&&

JPECK

Special Weather Statement
National Weather Service Pendleton OR
258 PM PDT MON JUN 26 2017

ORZ505-506-510-511-262300-
North Central Oregon OR-Central Oregon OR-Ochoco-
John Day Highlands OR-John Day Basin OR-
258 PM PDT MON JUN 26 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN JEFFERSON AND
SOUTHEASTERN WASCO COUNTIES UNTIL 400 PM PDT...

At 257 PM PDT, Doppler radar was tracking a strong thunderstorm near
Grizzly, or 14 miles southeast of Madras, moving northeast at 25 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Ashwood and Grizzly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4443 12080 4453 12101 4499 12066 4484 12034
TIME...MOT...LOC 2157Z 213DEG 21KT 4455 12085

TWE

Special Weather Statement
National Weather Service Pendleton OR
258 PM PDT MON JUN 26 2017

ORZ049-050-502-503-507-262300-
Grande Ronde Valley OR-
Foothills of the Northern Blue Mountains of Oregon OR-
Southern Blue Mountains of Oregon OR-
Northern Blue Mountains of Oregon OR-Wallowa County OR-
258 PM PDT MON JUN 26 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL UMATILLA...WEST CENTRAL
WALLOWA AND WESTERN UNION COUNTIES UNTIL 400 PM PDT...

At 254 PM PDT, Doppler radar was tracking strong thunderstorm 13
miles south of Starkey, or 22 miles west of North Powder. Other
strong thunderstorms were just south of Pilot Rock and between
LaGrande and Meacham. All storms were moving northeast at 25 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
La Grande, Meacham, Elgin, Island City, Imbler, Summerville, Thorn
Hollow, Lehman Hot Springs, Spout Springs, Kamela, Cayuse, Bingham
Springs, Starkey, Minam, Hilgard, Umatilla Reservation and Gibbon.

LAT...LON 4490 11842 4544 11897 4579 11849 4572 11746
TIME...MOT...LOC 2154Z 240DEG 23KT 4503 11839

Hull