Weather Links and Notes, Also Zulu or UTC Time Conversion

Weather Links Applicable to the U.S. and Intended as Direct Use Links and Clarification Links for Images used elsewhere.

Animated Weather Graphic:⬅ – GIF of Current Weather

Weather Prediction CenterAll Weather for precipitation of all types, basic coverage of Thunderstorms and similar.

Graphic Based on Today’s Weather Events.

Short Range Forecasts ⬅- Precipitation of all Types, Rain, Snow, Mix, Ice.Includes Thunderstorms.

Graphic that includes Today and Additional Day Weather Forecast.

Snow Amounts and Accumulation

The site I obtain the GIFs from has options. I use the Underlined Options.

• 1st: Precipitation Type: Freezing Rain or Snow
• 2nd: Forecast Products: Probability Forecast or Accumulation by Percentile
• 3rd: Forecast Duration: 24, 48, or 72 Hours
• 4th: User Interface: *ESRI or GIF
• 5th: Last, but not least, you need to Select Viewing Options
Choose a Percentile for the Specified Time


Choose the 24 Hour Period for the Specified Percentile

*””ESRI(/ˈɛzriː/, a.k.a. Environmental Systems Research Institute) is an international supplier of Geographic Information System (GIS) software, web GIS and geodatabase management applications.””

This chart, available at the Following Link, can be visualized as a Dynamic Map with MouseOver Information, or as Static GIF Maps.

WPC Probabilistic Winter Precipitation Guidance

Forecast Formats
The PWPF (Probabilistic Winter Precipitation Forecast) provides information in the following formats:

Probabilities of exceeding a threshold show filled contour levels of probability that the 24-hour, 48-hour, or 72-hour accumulation of winter precipitation will equal or exceed the given threshold.

As an example, consider the 6-inch threshold for snowfall. If a point of interest falls within the 40% contour on the probability map, then the chance of snowfall exceeding 6 inches is 40% or greater. As the threshold values increase, the probabilities of exceeding them decrease.

Percentile accumulations for 24-, 48-, or 72-hour intervals
Filled contours of snowfall or freezing rain amounts for which the probability of observing that amount or less is given by the percentile level.

For example, if the 75th percentile map shows six inches of snow at a location, then the probability of getting up to six inches of snow is 75% at that point. Conversely, there is only a 25% probability of snowfall exceeding six inches at the location in this example.

Percentile accumulations increase as the percentile level increases
• To illustrate this point, take the previous example, but instead of the 75th precentile map consider the 10th percentile map showing two inches of snow at the location. In this case, the probability of getting up to but no more than two inches of snow is just 10%.

• The probability of getting more than two inches is 90%; so, a significant accumulation of snow is likely.

For more information on creation of the PWPFs and how to navigate the web page, please see this ➡ informational video ⬅.

Storm Prediction Center: ⬅ This vital weather services reports on the Chances of Convective Weather Events:

These include:
Thunderstorms, Tornados, Wind, and Hail

For Current Day 1, the Current Day after 8:00 AM EST, and Valid Day 1, the Current Day before 8:00 AM EST (this option that goes away after 8:00 AM is the balance of weather events from the prior day), events are listed Categorically and Specifically:

Categorically Listed:
General Chance for Thunderstorms
Then for more Severe Event Chances:
Marginal, Slight, Enhanced, Moderate, and High

Specifically Listed:

• Probability of a tornado within 25 miles of a point.
• Hatched Area: 10% or greater probability of EF2 – EF5 tornadoes within 25 miles of a point.

• Probability of damaging thunderstorm winds or wind gusts of 50 knots or higher within 25 miles of a point.
• Hatched Area: 10% or greater probability of wind gusts 65 knots or greater within 25 miles of a point.

• Probability of one inch diameter hail or larger within 25 miles of a point.
• Hatched Area: 10% or greater probability of two inch diameter hail or larger within 25 miles of a point.

Tornados with Less Than 2% Likelihood, and Wind and Hail with Less Than 5% Likelihood, are not usually shown. The Weather Maps show the Nationwide Categorical and Specific areas where weather is to occur, and State Specific Maps are available:

Severe Convective Weather:

Current Outlooks

Current Day 1 Outlook ⬅ – After 8:00 AM EDT

Valid Day 1 Outlook ⬅ – From Yesterday Before 8:00 EDT


For Hurricane Related Weather, use the following link.

National & Central Pacific HURRICANE CENTER

Are you Befuddled by the Weather Abbreviations? Click Below:

Coordinated Universal Time

Referred to as Z-Time

The National Weather Service has a web page on the use of UTC time, first link below, and I’ve taken their tables, also given on their site, with the Time Zones reduced to just the Continental U.S., the next 2 Images.

You’ll need to know your location (always a great idea) and the policies of that location (some areas don’t use Daylight Savings Time) to accurately use the tables.

In National Weather Service Outlooks you’ll see 00Z, Midnight Zulu Time, the beginning of the next day.

00Z is 8:00 PM Eastern (During Daylight Savings Time) or 7:00 PM Eastern (During Standard Time).

01-03Z Denotes a Time Spread of 01 to 03Z which is 9:00 PM to 11:00 PM Eastern (During Daylight Savings Time) or 8:00 PM to 10:00 PM Eastern (During Standard Time).

12/00Z is a Date and Time. The reader must be aware of the date or dates the weather outlook applies to. This means the 12 of the month at 00Z, which is confusing, because the time is actually 8:00 PM or 7:00 PM Eastern (Daylight Savings Time or Standard Time Respectively) on the 11th of the month.

Author: Dr-Artaud

A Doctor that is not a Doctor, but named after a character in the movie "No Such Thing", as is the Avatar.

2 thoughts on “Weather Links and Notes, Also Zulu or UTC Time Conversion”

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