NWS Mesonet Observations - Last Updated 23 March 2011

Precipitation Duration
1Hr Precip 3Hr Precip 6Hr Precip 12Hr Precip 24Hr Precip Precip Since Mid. Precip Since 13:00 Include Snotel

Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

Gusts (kts)

Checks wind and gust,
plots gust in knots

Caution: Gusts ≥15kt

SCA: Gusts≥20kt

Gale: Gusts≥34kt

Storm: Gusts≥48kt

Hurricane: Gusts≥64kt

Ceiling (ft)

LIFR CIGS < 500FT

IFR CIGS 500 to <1KFT

MVFR CIGS 1 to 3KFT

VFR CIGS 3 to 7KFT

VFR CIGS > 7KFT

MSLP (mb)
≤900mb	<910mb
<920mb	<930mb
<940mb	<950mb
<960mb	<970mb
<980mb	<990mb
<1000mb	<1010mb
<1020mb	<1030mb
<1040mb	<1050mb
<1060mb	≥1060mb

Flight Category

LIFR

IFR

MVFR

Nearing MVFR

VFR

RFW Criteria

RH≤20% & wind ≥20 mph

RH≤15% & wind ≥25 mph

RH≤15% & wind ≥30 mph

Potential RFW Verification

At some time during previous 24 hours...

RH≤20% & wind ≥20 mph

RH≤15% & wind ≥25 mph

RH≤15% & wind ≥30 mph

Potential RFW Verification

At some time during previous 12 hours...

RH≤20% & wind ≥20 mph

RH≤15% & wind ≥25 mph

RH≤15% & wind ≥30 mph

Weather

Order of precedence

Freezing Rain/Drizzle

Hail

Thunder

Pellets

Snow

Rain and Snow

Rain/Drizzle

Fog

Haze/Smoke/Dust/Sand

Blowing Snow

Unknown Precipitation

Wind Chill

Wind Chill≤-50°F

Wind Chill≤-30°F

Wind Chill≤-15°F

Wind Chill≤0°F

Wind Chill≤15°F

Wind Chill≤40°F

Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

Relative Humidity

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

Dewpoint Depression

Td Depression≥0°F

Td Depression≥5°F

Td Depression≥10°F

Td Depression≥20°F

Td Depression≥30°F

Td Depression≥40°F

Td Depression≥50°F

Td Depression≥60°F

Td Depression≥70°F

Td Depression>80°F

Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

Soil Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

24hr Max Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

24hr Min Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

24hr Max Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

24hr Min Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

24hr Max Wind Gust

Gusts<20 mph

Gusts≥20 mph

Gusts≥30 mph

Gusts≥40 mph

Gusts≥50 mph

Gusts≥60 mph

Gusts≥75 mph

24hr Min Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

24hr Max Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

24hr Max RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

24hr Min RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

12hr Max Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

12hr Min Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

12hr Max Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

12hr Min Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

12hr Max Wind Gust

Gusts<20 mph

Gusts≥20 mph

Gusts≥30 mph

Gusts≥40 mph

Gusts≥50 mph

Gusts≥60 mph

Gusts≥75 mph

12hr Min Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

12hr Max Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

12hr Max RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

12hr Min RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

6hr Max Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥60°F

6hr Min Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥120°F

6hr Max Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

6hr Min Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

6hr Max Wind Gust

Gusts<20 mph

Gusts≥20 mph

Gusts≥30 mph

Gusts≥40 mph

Gusts≥50 mph

Gusts≥60 mph

Gusts≥75 mph

6hr Min Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

6hr Max Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

6hr Max RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

6hr Min RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

3hr Max Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥30°F

3hr Min Temperature
≤-40°F	-30s°F
-20s°F	-10s°F
-0s°F	+0s°F
10s°F	20s°F
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F
100s°F	110s°F
≥30°F

3hr Max Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

3hr Min Dewpoint
<30°F	≥30°F
≥35°F	≥40°F
≥45°F	≥50°F
≥55°F	≥60°F
≥65°F	≥70°F
≥75°F	≥80°F

3hr Max Wind Gust

Gusts<20 mph

Gusts≥20 mph

Gusts≥30 mph

Gusts≥40 mph

Gusts≥50 mph

Gusts≥60 mph

Gusts≥75 mph

3hr Min Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

3hr Max Visibility

LIFR Vis < 1SM

IFR Vis 1 to <3SM

MVFR Vis 3 to 5SM

VFR Vis = 6SM

VFR Vis > 6SM

3hr Max RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

3hr Min RH

RH<10%

RH≤15%

RH≤20%

RH≤30%

RH≤40%

RH≤50%

RH>50%

RH≥60%

RH≥70%

RH≥80%

RH>90%

Wave Heights (ft)
<1 ft	≥1 ft
≥2 ft	≥3 ft
≥4 ft	≥5 ft
≥6 ft	≥8 ft
≥10 ft	≥15 ft
≥20 ft	≥30 ft
≥40 ft	≥50 ft

Swell Heights (ft)
<1 ft	≥1 ft
≥2 ft	≥3 ft
≥4 ft	≥5 ft
≥6 ft	≥8 ft
≥10 ft	≥15 ft
≥20 ft	≥30 ft
≥40 ft	≥50 ft

Swell Period (s)
<2 sec	≥2 sec
≥4 sec	≥6 sec
≥8 sec	≥10 sec
≥12 sec	≥14 sec
≥16 sec	≥18 sec
≥20 sec

Road Freezing Depression
Freezing Depression≤0°F
Freezing Depression≤3°F
Freezing Depression≤8°F
Freezing Depression>8°F

Water Temperature
≤32°F	>32°F
40s°F	50s°F
60s°F	70s°F
80s°F	90s°F

Airport Weather Warning

Only for Elev < 6500ft

Caution: Gusts≥22 mph

AWW: Gusts≥30 mph

24hr Temperature Change
≤-50°F	-40°F
-30°F	-20°F
-10°F	-0°F
+0°F	+10°F
+20°F	+30°F
+40°F	≥50°F

24hr Dewpoint Change
≤-50°F	-40°F
-30°F	-20°F
-10°F	-0°F
+0°F	+10°F
+20°F	+30°F
+40°F	≥50°F

24hr Relative Humidty Change
≤-50%	-40%
-30%	-20%
-10%	-0%
+0%	+10%
+20%	+30%
+40%	≥50%

24hr Dewpoint Depression Change
≤-50°F	-40°F
-30°F	-20°F
-10°F	-0°F
+0°F	+10°F
+20°F	+30°F
+40°F	≥50°F

3hr Temperature Change
≤-25°F	-20°F
-15°F	-10°F
-5°F	-0°F
+0°F	+5°F
+10°F	+15°F
+20°F	≥25°F

3hr Dewpoint Change
≤-25°F	-20°F
-15°F	-10°F
-5°F	-0°F
+0°F	+5°F
+10°F	+15°F
+20°F	≥25°F

3hr Dewpoint Depression Change
≤-25°F	-20°F
-15°F	-10°F
-5°F	-0°F
+0°F	+5°F
+10°F	+15°F
+20°F	≥25°F

3hr Relative Humidty Change
≤-25%	-20%
-15%	-10%
-5%	-0%
+0%	+5%
+10%	+15%
+20%	≥25%

3hr Pressure Change
≤-10 mb	-9 mb
-8 mb	-7 mb
-6 mb	-5 mb
-4 mb	-3 mb
-2 mb	-1 mb
0 mb
+1 mb	+2 mb
+3 mb	+4 mb
+5 mb	+6 mb
+7 mb	+8 mb
+9 mb	≥+10 mb

ZLC Altimeter

Altimeter>30.00 inches

Altimeter≤30.00 inches

Altimeter≤29.92 inches

Convective Gust Monitor

Caution: Gusts≥40 mph

Severe: Gusts≥58 mph

Frost/Freeze Potential Verification

Checks 24 hour temperature minimum

Hard Freeze (≤28°F)

Freeze (29°F-32°F)

Frost (33°F-36°F)

Frost/Freeze Potential Verification

Checks 12 hour temperature minimum

Hard Freeze (≤28°F)

Freeze (29°F-32°F)

Frost (33°F-36°F)

Synoptic Gust Monitor

Checks wind and gust,
plots gust

Wind≥25 mph and/or
Gusts≥40 mph

Wind≥31 mph and/or
Gusts≥45 mph

Wind≥40 mph and/or
Gusts≥58 mph

Wind≥50 mph and/or
Gusts≥75 mph

Synoptic Gust Monitor
(24 hrs)

Gusts≥40 mph

Gusts≥45 mph

Gusts≥58 mph

Gusts≥75 mph

Synoptic Gust Monitor
(12 hrs)

Gusts≥40 mph

Gusts≥45 mph

Gusts≥58 mph

Gusts≥75 mph

Synoptic Gust Monitor
(6 hrs)

Gusts≥40 mph

Gusts≥45 mph

Gusts≥58 mph

Gusts≥75 mph

Heat Index

Heat Index>=80°F

Heat Index>=90°F

Heat Index>=105°F

Heat Index>=130°F

Road Temperature

Road Temp≤26°F

Road Temp≤32°F

Road Temp≤40°F

Road Temp>40°F

Road Freezing

Road Freezing Temp<26°F

Road Freezing Temp≥26°F

Road Freezing Temp≥32°F

Road Surface

Ice

Snow

Frost

Wet, Moist

Chemical Wet

Dry

Snow Watch

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