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 /06Z TAFS THROUGH 06Z SATURDAY/

VFR conditions currently across all sites, which will stay the course through the period for most terminals. However, KRDM/KBDN are expected to be impacted by nearby wildfire smoke as reduced visibilities and ceilings will lead to MVFR conditions overnight into Friday morning. Breezy afternoon/evening winds will be widespread with gusts of 15-25kts. 75

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 97 61 89 / 0 0 0 0 ALW 68 100 66 92 / 0 0 0 0 PSC 66 100 66 94 / 0 0 0 0 YKM 64 99 64 89 / 0 0 0 0 HRI 65 100 66 91 / 0 0 0 0 ELN 61 94 60 86 / 0 0 0 0 RDM 56 95 54 89 / 0 0 0 0 LGD 62 101 61 96 / 0 0 0 0 GCD 58 100 58 95 / 0 0 0 0 DLS 65 95 64 84 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

WA...Red Flag Warning from 10 AM to 8 PM PDT Saturday for WAZ690- 691. Air Quality Alert until 9 AM PDT Friday for WAZ028>030. OR...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 from 1 PM Friday to 8 PM PDT Saturday for ORZ698-700.