textproduct: Pendleton

KEY MESSAGES

- Chances of thunderstorms continue through Sunday.

- Cooling trend will progress through next week.

- Secondary wet pattern going into mid-next week.

DISCUSSION

Radar depicts dry conditions, with satellite showing an upper level low off California that will continue to push east. Behind that, a secondary upper low will push inland around the early Sunday morning timeframe. This will continue to bring active/semi-active weather in the picture for the next several days. Sufficient CAPE will develop in the late Friday afternoon hours, allowing for thunderstorm activity to expand Friday- Saturday. Areas mostly concerned for thunderstorm chances (15-25%) will be along Central Oregon through the Wallowa's with the main development hours around 2-6PM.

Saturday becomes a bit uncertain regarding thunderstorm chances. Although it looks like the aerial coverage now includes the Foothills of the Blues, I'm uncertain how widespread thunderstorms will develop due to abundant cloud coverage over the area. Areas with more breaks in the clouds (or have more time to heat from the sun) will see greater chances of widespread thunderstorms to develop. It can't be ruled out that some of these storms can produce pea to penny size hail in the strongest developing cells with some embedded gusty winds.

By Monday, things begin to calm down with drier conditions entering the picture as the trough progresses to the east with a more zonal pattern moving into the region. Our cooling trend will continue through mid-next week (75-95% chance) as a second low pressure system drops through the Gulf of Alaska/British Columbia area by the Wednesday timeframe that will reset another valley rain/mountain snow event.

AVIATION /06Z TAFS THROUGH 06Z SATURDAY/

VFR conditions prevail, with the exception of some temporary obscurity in BDN with 2-5SM of Haze. Conditions will improve later in the night. Light winds will remain with occasional gusty winds with some heavy showers developing tomorrow morning towards the end of the period. Otherwise, not expecting any significant highlights other than some SCT025 clouds with a 5-15% chance they could turn into a BKN/OVC deck.

Preliminary Point Temps/PoPs

PDT 66 46 67 42 / 20 30 60 30 ALW 67 49 67 46 / 20 40 70 30 PSC 72 48 72 45 / 10 30 40 20 YKM 70 46 68 42 / 10 30 30 10 HRI 69 46 70 44 / 10 30 40 20 ELN 67 44 62 40 / 10 30 30 10 RDM 66 40 61 37 / 50 70 60 50 LGD 69 44 63 42 / 40 50 80 60 GCD 65 42 62 40 / 70 60 70 60 DLS 70 50 67 47 / 10 50 40 20

PDT WATCHES/WARNINGS/ADVISORIES

WA...None. OR...None.