textproduct: Pendleton

KEY MESSAGES

1. Continued dry and warm conditions *Heat Advisory in Effect*

2. Isolated to scattered thunderstorms Today *Red Flag Warning in affect for Abundant Lightning*

3. Hot, dry and windy conditions return Friday & Saturday *Red Flag Warning in affect for winds and RHs*

DISCUSSION

Current satellite shows some cumulus beginning to pop up over the eastern portion of the CWA in Grant, Union and Wallowa Counties. THunderstorms are expected to persist through the early evening with the potential for abundant lightning, small hail and outflow winds of 45 mph.

Continued dry and warm conditions have persisted over the last few days with high daytime temperatures in the 90s up to near 105 degrees. Overnight temperatures have been in the upper 60s to low 70s. With that, a heat advisory has been issued for heat related impacts. The heat advisory will end tonight as low pressure moves in allowing temperatures to moderate out and cool a bit. Confidence in the heat settling is 80-90%.

Today will see another round of thunderstorms across the region. This time they will be farther east across the eastern mountains, the Blue and into the Wallowa area. Abundant lightning is expected with these storms as well as small hail and gusty outflow winds around 45 mph. Confidence in these thunderstorms is high with 80-90% however, confidence in where storms will actually traverse is moderate. Storms could travel a bit farther north into the Blues so extended the Red Flag warning to cover there.

Models show the upper level low to continue to push onshore bringing with it cooler yet still dry air. NBM raw ensembles shows there to be above 80% probabilities of see 25 to 30 mph sustained winds across the Gorge, foothills of the southern Blues, Simcoe Highland of Klickitat, Yakima and Kittitas Valleys. 80% probabilities of 15-20 mph winds between north central OR, central OR and the central and southern Blue mountains. The dry air will keep humidity to 25% and below through those areas and coupled with the winds will lead to critical fire weather. SPC also has a large portion of the aforementioned areas in critical fire weather. With all that, a Red Flag Warning has been issued for the southern Blue mountains and the central mountains of OR for Friday. Then Saturday those two zones plus the central Blue mountains, Kittitas Valley, lower Columbia Basin of OR & WA and northern Deschutes National Forest for winds and RHs.

AVIATION /18Z TAFS THROUGH 18Z FRIDAY/

MVFR to VFR conditions continue with lingering smoke/haze impacting area terminals. Increasing west to northwest winds of 10-15 kts with gusts up to 25 kts anticipated for KDLS, KPDT, KRDM, and KBDN by 20z. These winds could improve visibilities at those terminals through the evening hours, with visibilities potentially decreasing again through early morning hours of Friday. Branham/76

FIRE WEATHER

A lot happening in the fire weather realm of things. Today will see thunderstorms along the eastern portion of the CWA. Abundant lightning is expected with these storms as well as small hail and gusty outflows of near 45 mph. Tomorrow will see another round of Red Flag Warnings for central Mountains of Oregon and the southern Blue Mountains for winds and RHs. These two will roll into Saturday and be accompanied by central Blue mountains, Kittitas Valley, lower Columbia Basin of OR & WA and northern Deschutes National Forest for winds and critical RHs.

Preliminary Point Temps/PoPs

PDT 61 96 61 90 / 0 0 0 0 ALW 68 99 67 93 / 0 0 0 0 PSC 66 100 66 94 / 0 0 0 0 YKM 64 99 64 89 / 0 0 0 0 HRI 65 99 66 92 / 0 0 0 0 ELN 61 94 60 86 / 0 0 0 0 RDM 56 95 54 89 / 0 0 0 0 LGD 62 100 61 96 / 0 0 0 0 GCD 58 100 57 95 / 0 0 0 0 DLS 65 96 64 85 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...Heat Advisory until 9 PM PDT this evening for WAZ024-027>029. Red Flag Warning from 10 AM to 8 PM PDT Saturday for WAZ690- 691. Red Flag Warning until 9 PM PDT this evening for WAZ693. Red Flag Warning until 7 PM PDT this evening for WAZ692. Air Quality Alert until 9 AM PDT Friday for WAZ028>030. OR...Heat Advisory until 9 PM PDT this evening for ORZ041-044-507. Red Flag Warning from 10 AM to 8 PM PDT Saturday for ORZ691- 697-704. Air Quality Alert until noon PDT Friday for ORZ044-049-050-502- 503-505-506-508-509-511. Red Flag Warning until 8 PM PDT this evening for ORZ694-695- 697>699. Red Flag Warning until 9 PM PDT this evening for ORZ693. Red Flag Warning from 1 PM Friday to 8 PM PDT Saturday for ORZ698-700. Red Flag Warning until 7 PM PDT this evening for ORZ692.