Visual Hazardous Weather Outlook Key

A description of "This Period is Clear" for a given time period indicates that none of the hazards listed in the Outlook are expected during that time frame.

Fire

NoneNone
LowAt least 1 of the following criteria are met: 1) relative humidity will be less than 25% 2) the 20 foot sustained wind speed will be >15 mph. Forecaster discretion. 3) the ten hour fuel stick moisture is <9% or sporadic wild fire conditions are noted 4) Forecaster discretion
ElevatedAt least 2 of the following criteria are met: 1) relative humidity will be less than 25% 2) the 20 foot sustained wind speed will be >15 mph. Forecaster discretion. 3) the ten hour fuel stick moisture is <9% 4) Forecaster discretion
HighRed Flag Warning for part or all of the area. This means that the expected relative humidity will be less than 25%, the 20 foot sustained wind speed will be >15 mph, and the ten hour fuel stick moisture is <9%. These three criteria must be met, or on the advice/request of a fire weather manager.

Fog

LowSome fog, mainly in valleys and near rivers.
ElevatedLocally dense fog. Most areas experiencing fog, but only a few locations have visibilities less than one quarter of a mile.
HighDense Fog Advisory - Widespread fog with visibilities of a quarter mile or less

Hail

NoneNo hail expected.
LowSmall hail possible. Less than 1 inch in size.
ElevatedHail possible. 1 inch in size up to golf ball size possible.
HighHail likely. Larger than golf ball size hail possible.

Heavy Rain

NoneHeavy Rain not expected.
LowIsolated locations could receive some heavy rain. Not expected to be widespread.
ElevatedHeavy rain expected over some of the area. Localized flooding possible.
HighFlood or flash flood watch in effect. There is the Potential for heavy rain and flooding over large areas.

Ice

NoneNo ice is expected
LowSome ice may develop. Impacts are expected to be minor.
ElevatedIce is expected with amounts less than 1/4 of an inch.
HighIce Storm Warning. More than 1/4 of an inch expected.

River Flooding

NoneNo river flooding expected.
LowMinor flooding - minimal or no property damage, but possibly some public threat or inconvenience.
ElevatedModerate Flooding - some inundation of structures and roads near stream. Some evacuations of people and/or transfer of property to higher elevations is necessary.
HighMajor or Record Flooding - extensive inundation of structures and roads. Significant evacuations of people and/or transfer of property to higher elevations. Flooding may equal or exceed the highest stage or discharge at a given site during the period of record keeping.

Snow

LowLight snow expected. Minor accumulations possible. Travel impacts expected to be minor.
ElevatedWinter weather advisory. Snow amounts of generally 2-4 inches expected. First event of the season, forecast amounts may be less.
HighWinter Storm Warning or Blizzard Warning - 4 or more inches of snow expected.

Strong Winds

NoneWinds less than 20 mph expected.
LowWinds of 20 to 30 mph expected, or a Lake Wind Advisory is in effect.
ElevatedWind Advisory. sustained winds of 30 mph and/or wind gusts to 45 mph expected. Weak branches may break and fall from trees.
HighHigh wind Warning. Wind gusts of 58 mph or higher expected. Downed trees and power lines expected.

Thunderstorm Winds

NoneNone.
LowThunderstorm winds generally below 40 mph, though a few gusts 40 to 57 mph possible. Isolated wind gusts 58 mph or greater cannot be ruled out.
ElevatedThunderstorm winds 40 to 57 mph likely, with some gusts 58 mph or greater.
HighThunderstorms expected with wind gusts above 58 mph and large areas of wind damage possible.

Thunderstorms

NoneNo thunderstorms expected
LowThunderstorms forecast for this time period. However, they are expected to be scattered or isolated in coverage. Non-severe thunderstorms expected. Isolated severe storms cannot be ruled out.
ElevatedThunderstorms are likely, or coverage is expected to be scattered to numerous. Storm Prediction Center may or may not have us outlooked in a Slight Risk for severe thunderstorms.
HighThunderstorms are expected and the Storm Prediction Center has us outlooked in a moderate or high risk of severe weather.

Tornadoes

NoneNo tornadoes
LowLow risk of tornadoes. Area typically in a slight risk per the Storm Prediction Center. Tornadoes usually weaker (less than EF2), and shorter lived, but can still cause notable damage.
ElevatedModerate risk as defined by the Storm Prediction Center with tornadoes mentioned for our area. Longer track tornadoes (EF2 or greater) cannot be ruled out.
HighHigh risk as defined by the Storm Prediction Center with tornadoes a significant threat. Long track tornadoes (EF2 or greater) possible.

Wind Chill

LowWind Chill values expected to be between 5 and -10.
ElevatedWind Chill Advisory - Wind Chill values expected to be -10 to -25.
HighWind Chill Warning - Wind chill values expected to reach -25 or lower


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