Andrew's Weather Center

UTC/GMT/Z Time:

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UNDERSTANDING WEATHER ALERTS:
EMERGENCY
Significant and life-threatening weather is about to occur in a densely populated area. Seek sturdy shelter with extreme haste, as dangerous weather has been observed or confirmed on the ground. Weather emergencies are rare, but must be taken with the utmost seriousness when issued.
WARNING
Significant or severe weather is about to occur. Seek shelter immediately. If a warning is issued, then be aware that dangerous weather conditions have been observed or confirmed on the ground and are likely heading to your location.
WATCH
Weather watches are meant to make the public more aware of the chance for significant weather. This means that conditions are favorable for the specified weather to occur. Weather watches are issued when high confidence exists in significant weather developing soon.
ADVISORY
Do NOT underestimate or ignore a weather advisory. Advisories alert the public to potential significant weather that may stay below warning criteria, but will still pose a threat to life and property. Remain vigilant for potential changes to the weather advisory.





TIME CONVERSION TABLE:
UTC/Zulu
[Universal]
EDT
[Daylight Saving]
EST
[Standard]
0000
8:00 PM
7:00 PM
0100
9:00 PM
8:00 PM
0200
10:00 PM
9:00 PM
0300
11:00 PM
10:00 PM
0400
12:00 AM
11:00 PM
0500
1:00 AM
12:00 AM
0600
2:00 AM
1:00 AM
0700
3:00 AM
2:00 AM
0800
4:00 AM
3:00 AM
0900
5:00 AM
4:00 AM
1000
6:00 AM
5:00 AM
1100
7:00 AM
6:00 AM
1200
8:00 AM
7:00 AM
1300
9:00 AM
8:00 AM
1400
10:00 AM
9:00 AM
1500
11:00 AM
10:00 AM
1600
12:00 PM
11:00 AM
1700
1:00 PM
12:00 PM
1800
2:00 PM
1:00 PM
1900
3:00 PM
2:00 PM
2000
4:00 PM
3:00 PM
2100
5:00 PM
4:00 PM
2200
6:00 PM
5:00 PM
2300
7:00 PM
6:00 PM





CLOUD IDENTIFICATION TABLE:
Genus
Image
Altitude [feet]
Composition
Indication
Cirrus [Ci]
> 20,000 ft
Ice crystals
Fair weather; Uniform cirrus indicate an approaching warm front
Cirrocumulus [Cc]
> 20,000 ft
Primarily ice crystals
In winter, indicate fair, cold weather; At tropical latitudes, Cc may indicate an approaching tropical cyclone
Cirrostratus [Cs]
>= 20,000 ft
Ice crystals
Signals an approaching warm front if Cs thicken; Forms when layer of air lifted by convergence
Altostratus [As]
Between 6,500 and 20,000 ft
Water droplets
Signals incoming continuous rain or snow; Occasionally, rain may fall from As
Altocumulus [Ac]
Between 6,500 and 20,000 ft
Primarily of water droplets
Presence of Ac on a warm, humid summer morning suggest afternoon thunderstorms; Ac form in an unstable layer aloft
Stratocumulus [Sc]
Generally
Water droplets
Sc generally represent improving weather conditions; During winter, stable weather likely
Cumulonimbus [Cb]
Up to 50,000+ ft
Mixed phase
Convective/stormy weather in the vicinity; NOTE: Lightning can strike well outside of these clouds - Always remain aware of your weather surroundings
Cumulus [Cu]
Water droplets
As long as no vertical development is taking place, Cu indicate fair weather
Nimbostratus [Ns]
Primarily of water droplets; can contain ice crystals in sub-freezing air temperature
Ns are precipitation clouds; Ns are accompanied by light to moderate falling precipitation
Shelf/Arcus [-]
Water development
Approaching thunderstorm; Form when cool, sinking air from a storm's downdraft spread out ahead of the storm
Wall Cloud [-]
Water droplets
Severe weather is occurring nearby; These clouds mean trouble. Wall clouds often rotate and are usually the location where tornadoes form in a thunderstorm
Scud/Fractus [-]
Water droplets
If you are seeing scud clouds, that means that a parent thunderstorm clouds is nearby, where rain, hail, gusty winds, and lightning is likely occurring; Rain will very likely start soon
Mammatus [CBMAM]
Between 30,000 and 50,000 ft
Water droplets; Often mixed phase with ice crystals as well
These clouds occur when moist air sinks into a layer of dry air, creating pouch-like clouds; These clouds signal a nearby, thunderstorm, usually an intense one, and typically appear after the passage of said storm
Contrails [-]
Between 25,000 and ~60,000 ft
Primarily water droplets; can also contain sulfurous compounds or jet fuel impurities
Contrails form when there is ample moisture in the high levels of the atmosphere and the air is very cold; Short lived contrails may indicate fair weather due to the relatively dry air, and conversely, long-lived contrails may suggest a changing weather pattern (see the Appleman Chart above)
Noctilucent [NLC]
Between 250,000 and 280,000 ft
Dust particles and water vapor
These polar mesospheric clouds form when temperatures in the mesosphere are below -200 degrees Fahrenheit, causing water droplets to freeze into ice clouds