Weather Alerts for Multnomah CountyIssued by the National Weather Service |
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MULTNOMAH COUNTY | ||
Areas Affected: Mt. Hood National Forest Region |
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Effective: Tue, 9/2 2:05pm | Updated: Wed, 9/3 12:05am | Urgency: Expected |
Expires: Wed, 9/3 5:00am | Severity: Severe | Certainty: Likely |
Details:
The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms, which is in effect from noon to 9 PM PDT Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood National Forest Region. * THUNDERSTORMS...A 15 to 20% chance of dry thunderstorms. Storms may produce very little rainfall, increasing the risk of new fire starts from dry lightning. * OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at these speeds can be observed tens of miles away from the core of the thunderstorm. * DRY AND UNSTABLE...Unstable conditions with elevated mixing heights may promote pyroconvective activity over ongoing fires. * IMPACTS...Conditions may be favorable for rapid fire spread which may threaten life and property. Thunderstorm outflow winds may result in unanticipated erratic fire spread. High instability may result in fire growth. Frequent lightning and critically dry fuels may result in new fire starts. Information: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of the above conditions can contribute to extreme fire behavior. |
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MULTNOMAH COUNTY | ||
Areas Affected: West Columbia River Gorge I-84 Corridor - Upper Hood River Valley - Central Columbia River Gorge I-84 Corridor - West Columbia River Gorge - SR 14 - Central Columbia River Gorge - SR 14 |
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Effective: Tue, 9/2 1:11pm | Updated: Wed, 9/3 12:05am | Urgency: Expected |
Expires: Wed, 9/3 5:00am | Severity: Moderate | Certainty: Likely |
Details:
* WHAT...Afternoon high temperatures in the mid to upper 90s and overnight low temperatures in the mid 60s to lower 70s expected. * WHERE...Western and Central Columbia River Gorge and the Hood River Valley. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. * ADDITIONAL DETAILS...Increasing high clouds may limit high temperatures on Wednesday compared to Tuesday, however probabilities for high temperatures above 90 degrees on Wednesday are high, ranging from 75-95%. Information: Drink plenty of fluids, stay in a cool place during the heat of the day, stay out of the sunshine, and check up on relatives and neighbors. For those without air conditioning, use fans to keep air moving. Keeps windows closed during the day and open at night, unless air quality is degraded due to wildfire smoke. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. |