Fire Weather Outlook Discussion
Issued by NWS
Issued by NWS
227 FNUS22 KWNS 081956 FWDDY2 Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0256 PM CDT Tue Jul 08 2025 Valid 091200Z - 101200Z ...CRITICAL FIRE WEATHER AREA FOR CENTRAL NEVADA AND FAR WESTERN UTAH... ...Great Basin... A mid-level jet max rounding the southern periphery of a short wave ejecting into the Great Basin will move over NV Wednesday. Efficient boundary layer mixing and subsequent surface winds of 15-25 mph with relative humidity in the 10-15% range will result in critical fire weather conditions across central NV/ far western UT Wednesday afternoon amid dry/receptive fuels. A broader elevated fire weather threat remains across much of the Great Basin as the trough pushes through the region. ...Northwest... Deep-layer westerly flow will continue to bring elevated fire weather conditions to portions of the Columbia Basin on Wednesday. A cold front and general onshore flow pattern will usher in cooler temperatures and higher relative humidity through the Cascade gaps and Columbia River Gorge but overall stronger surface winds and a remaining dry boundary layer will support an elevated fire weather threat across the eastern Columbia Basin. Isolated high-based thunderstorms are still expected across southeastern OR and southwestern ID as a mid-level trough axis pushes into the Great Basin. Limited rainfall will increase ignition efficiency over dry fuels in addition to providing gusty/erratic outflow winds. ..Williams.. 07/08/2025 .PREV DISCUSSION... /ISSUED 0153 AM CDT Tue Jul 08 2025/ ...Synopsis... A compact midlevel trough will track eastward across the Northwest during the day -- in tandem with a robust midlevel trough/low moving eastward from British Columbia into Alberta. Large-scale ascent preceding the midlevel trough moving across the Northwest will promote another day of isolated high-based thunderstorms -- with a focus over southeastern OR into southwestern ID. Deep inverted-V soundings and PW around 0.7 inches will favor dry thunderstorms capable of producing lightning-induced ignitions and strong/erratic outflow winds. Similar to Day 1/Tuesday, a belt of strong deep-layer westerly flow (peripheral to the midlevel trough) across the Cascades will lead to breezy/gusty westerly surface winds in the Columbia Basin. While increasing boundary-layer moisture will limit RH reductions compared to Day 1/Tuesday, stronger surface winds will offset this and still yield elevated fire-weather conditions. Over the Great Basin, moderate midlevel southwesterly winds accompanying the compact midlevel trough will overspread the Great Basin during the day. Deep boundary-layer mixing into this strengthening flow aloft will support another day of elevated to locally critical fire-weather conditions, given increasingly dry/receptive fuels. ...Please see www.spc.noaa.gov/fire for graphic product... $$