Featured Graphic: GOES 24-hr WV image, North America.
Hourly Forecast Graph or Hourly Numerical Data. These will provide a much higher-resolution view of the predicted weather to come than most NWS forecast products; they give the forecaster’s best prediction for future hour-by-hour readings of temperature, sky cover, wind speed and direction, precipitation potential, and other useful parameters.
For a more nuanced analysis, consult the Forecast Discussion, issued daily around 3 AM and 3 PM by the local NWS office, which will detail the forecaster’s confidence in the predictions being made plus meteorological reasoning and justification. While this product usually contains some jargon and abbreviations, most technical terms are hyperlinked to definitions so it is quite useful for self-education.
GOES 16 WV image, North America. A color enhanced view, previous 24 hours.
Milwaukee/Sullivan radar image, via Weather Underground. Updated every 5 minutes, with storm tracking (bearing, speed) and cell characteristics.
GOES Visible-only Satellite – 1 KM, N. IL – S. WI. A “tighter,” higher-resolution image of Southern Wisconsin in visible spectrum only (overnight images are elided). This product from the College of Dupage has a “zoom-button” allowing for especially good apprehension of vertical-build during convective weather and of finer-grained cloud elements more generally. Check-boxes at the bottom allow for a number of meteorological and geographical overlays to be added.
GOES Infra-red + radar, IL & WI. As above, but with 24-hr imagery (IR spectrum) and radar overlaid.
Water Vapor Image – 6KM, 24 Hr. This water-vapor image of North America from College of DuPage is one of the best we can find. A number of settings for adjusting the image appear near the top. Above the settings, at the top right, the “Sector Map” and “Product Menu” allow you to view different sub-regions of the U.S. and access additional graphics, including infra-red and visible satellite and radar composites. For additional images, both wider and narrower in scope, see “C.O.D. Satellite & Radar Page” below.
Water Vapor Image – 6KM, 48 Hr. As above, but twice as long, so it may take a little while to download.
GOES 16 WV image, Upper Midwest. A high-resolution image of the N. Plains and Upper Midwest from the new GOES 16 satellite, at 12 frames/hour, which allows fine-grained and subtle features in the upper-tropospheric winds to be scrutinized. The the L-Hand menu allows different spectral bands / atmospheric features to be presented, at varying lengths, and capturing different geographical sectors.
WV Image – 8KM, Northern Hemisphere. A wider-frame view of North America, showing roughly 4,000 miles of adjacent ocean on each side. The larger-scale structure of the upper-air pattern affecting the continent can be discerned here, allowing better comprehension of blocking patterns or the approach of a pattern change.
C.O.D. Satellite & Radar Page. The five menu banners on the L-hand side of this page allow you to view imagery at a number of scales. The “Hemispheric Products” include views of Canada, the North Pole, adjacent oceans and the entirety of the North/Western Hemisphere. High resolution visual images of regions as small as a few hundred miles square can be found under “1km Products.” In either case, first click on the type of image you want from the drop-down menu under the banner, then click into the map that appears to select a region. Once a static image has appeared, lengths of loop can be chosen from the “product menu” above the map.
7-Day Satellite Review. A useful and informative visual for comprehending larger scale atmospheric patterns over North America at a glance, courtesy of the Space Science and Engineering Center at the UW-Madison.
“Windyty” In addition to showing how surface-winds are blowing across the country, the menus on this graphic allow for multiple parameters to be displayed. Usefully, the lower R-hand menu allows hour-by-hour comparisons between the European (ECMWF), Global Forecast Systems, (GFS), and North American (NAM) computer models to be made, as far out as 9 days in the case of the first two.
Earth Wind Map. A similar graphic, but on a rotatable, tiltable earth and with views of many height levels, including stratosphere. (To change the view, click the word “Earth” in the lower left.)
SWODY1, SWODY2, & SWODY3 give the Storm Prediction Center’s severe weather outlooks for future days 1 (today) thru 3. Text and graphics assess risk-level, risk-type and etiology of the day’s threats. These are the go-to products for virtually everyone interested in severe weather, including spotters and chasers. Mesoscale Discussions (MDs) – which include a small weather map with near real-time analysis – are an excellent resource for assessing particular, more localized threats when severe weather is occurring.
Additional Graphics & other resources:
NCEP Model Guidance – GFS Page. The grid-box on this page offers viewing of different parameters from the Global Forecast Systems model. A basic visualization of coming weather can be had by selecting “1000_500_thick” which will show predicted precipitation along with surface and mid-level pressure fields (actually, mid-level “heights”). The “Back” button in the upper left will take you to the general guidance page where other models and geographical regions are available.
C.O.D. Analysis Products. This page links to a number of visualization products including atmospheric soundings (both actual and prognostic), cross-sectional analyses and maps of isentropic surfaces among others.
Soundings. This prognostic sounding generator comes with instructions, also linked here. Soundings are generated by choosing a forecast model, a starting time, the number of hours forward you’d like to view (up to 16), and a location. (“KMSN” can be entered to get a sounding for Madison). A number of resources can be found online to help you interpret soundings if you are unfamiliar with them.
CPC Seasonal Outlook. This Climate Prediction Center page not only includes forecast maps out to 13 months, but also long-lead discussions for the upcoming 30 and 90 day periods which are updated around the 1st and 20th of each month.
Climate Prediction Center. The CPC’s homepage has assessments of drought and other hazards, as well as links to information on longer-term patterns like El Nino / La Nina, the Madden Julian Oscillation and the Arctic Oscillation.
Snow Cover. This NOAA site provides a wealth of data including snow depth, temperature, density, water-equivalence and much more (but remember to hit the “redraw map” button each time). Zoom in on the map for better detail.
72-Hour Observation Trace – Madison. This chart shows hourly conditions for the past three days at the Truax Field / KMSN recording station. The numbers in the “Sky Cond.” field refer to ceiling heights, and represent the first three digits of the cloud deck in feet above ground level (ie., 003 would be read as “300 feet;” 150 would be read as “15,000 feet.”
Weather Spark. This site provides a graphical representation of historical weather – including hourly readings of parameters such as percent of cloud cover, height of ceiling, dewpoint, wind speed and direction – going back to 1948 (an astonishing accomplishment in itself). Additional functionalities are available through the banner at the top.
This page may be useful in helping visualize why the earliest and latest sunrises and sunsets do not occur on the Winter and Summer Solstices, but fall both earlier and later by a period of days or weeks depending on one’s latitude. This written analysis provides an extensive explanation, from simple to complex.
An interesting site, courtesy of the UW-Madison’s Cooperative Institute for Media Satellite Studies, for interpretation of past or approaching weather events from a satellite-analysis perspective (so it comes with good visuals).