National Weather Service United States Department of Commerce

May 28th 2017 Severe Storms and Flooding

An overview of the severe storm and heavy rainfall event over northwest Ohio and northeast Indiana May 28 2017. Read More >

PARAMETER

WATCH

WARNING

ADVISORY

BLIZZARD

Potential for Sustained wind or frequent gusts > 35 mph and visibility ¼ mi < in S/BS for > 3 hrs in the next 12 to 48 hours

 

 

BLIZZARD WATCH

Sustained wind /frequent gusts > 35 mph and visibility < ¼ mile in snow/blowing snow for > 3 hours

 

 

BLIZZARD WARNING

NOT ISSUED

BLOWING DUST

NOT ISSUED

NOT ISSUED

Widespread visibility < ¼ mile

BLOWING SNOW

NOT ISSUED

NOT ISSUED

Widespread visibility < ¼ mile

WINTER WEATHER ADVISORY

FIRE

Potential for ten hour fuels <= 8%, sustained winds >= 20 mph for 3 hours or more, RH <= 25% for 3 hours or more


FIRE WEATHER WATCH

ten hour fuels <= 8%, sustained winds >= 20 mph for 3 hours or more, RH <= 25% for 3 hours or more

RED FLAG WARNING

NOT ISSUED

FOG

NOT ISSUED

NOT ISSUED

Widespread visibility < ¼ mile

FREEZE

Potential for Temperatures < 32° F between May 1 and October 20

Temperatures < 32° F between May 1 and October 20

NOT ISSUED

FROST

 

NOT ISSUED

Formation of frost between May 1 and October 20

FREEZING RAIN

Potential for freezing rain with significant /damaging ice accumulations (usually ≥ ¼")

 

WINTER STORM WATCH

Ice accumulation ≥ ¼" on all surfaces

 

ICE STORM WARNING

Light ice accrual generally  < ¼" of an inch on all surfaces

 

FREEZING RAIN ADVISORY

FREEZING FOG

 

Ice accrual covering all surfaces with ice accumulation < ¼"

Very light ice accumulation from freezing fog

HEAT INDEX

 

HI > 105° F and the minimum heat index of at least 75° F for a 48 hour period.

Consider a HI warning if Heat advisory conditions are met for 4 consecutive days

HI around 100° F and/or
Max temperature  > 95° F

ICE STORM

 

Ice accumulation > ¼" with damage

NOT ISSUED

SLEET

 

Sleet ≥ ½" accumulation

WINTER STORM WATCH

Sleet Accumulation > ½"

WINTER STORM WARNING

Sleet Accumulation < ½"

WINTER WEATHER ADVISORY

HEAVY SNOW

(also used for snow and blowing snow)

Snow accumulation ≥ 6" avg in 12 hrs
or ≥ 8" in 24 hrs

WINTER STORM WATCH

> 6 " in 12 hours
> 8 " in 24 hours

WINTER STORM WARNING

3 to 5 inches
2 to 4 inches(forecaster discretion)

WINTER WEATHER ADVISORY

LAKE EFFECT SNOW

(also used for lake effect snow and blowing snow)

Potential for snow

accumulation: ≥ 6" in 12 hrs or ≥ 8" in 24 hrs

LAKE EFFECT SNOW WATCH

Snow accumulation ≥ 6" avg in 12 hrs or ≥ 8" in 24 hrs

 

LAKE EFFECT SNOW WARNING

3 - 5 inches of lake effect snow in 12 hours (forecaster discretion 2 - 4 inches)

 

LAKE EFFECT SNOW ADVISORY

WIND

(HIGH WIND)

Sustained non-convective wind > 40 mph
or > 1 hour and/or gusts > 58 mph


HIGH WIND WATCH

Sustained non-convective wind > 40 mph for > 1 hour and/or gusts > 58 mph

HIGH WIND WARNING

Sustained non-convective wind between 30 and 39 mph for > 1 hour and/or gusts between 45 - 57 mph

WIND ADVISORY

WIND CHILL

Potential for WC ≤ -25° F

WIND CHILL WATCH

WC < -25° F

WIND CHILL WARNING

WC -15° F to -29° F

WIND CHILL ADVISORY

WINTER STORM

 

Potential for snow accumulation: ≥ 6" in 12 hrs or ≥ 8" in 24 hrs , Combination of Snow, Sleet and Freezing Rain Meeting Warning Criteria, and/or Blowing and Drifting Snow Approaching Blizzard Conditions; Mixed Precipitation (lesser amounts if mixed precipitation)

Wind Chill ≤ -25° F

WINTER STORM WATCH

Combination of any winter warning hazards, including significant blowing and drifting snow below blizzard conditions (lesser amounts may be warranted especially if significant mixed precipitation in an early or late season event)

 

WINTER STORM WARNING

 

WINTER WEATHER

 

 

Combination of any winter advisory hazards

WINTER WEATHER ADVISORY