Difference Between Single vs. Multiple Lake Effect Snow Bands

Radar image showing both single and multiple snow bands.

In an earlier article, we discussed the dynamics and thermodynamics of lake effect snow. In this post, we discuss the meteorological differences between single-band and multiple-band lake-effect snow events.  Keep in mind that all lake-effect snow events are fueled by moisture and latent heat flux from the relatively warm lake water; these fluxes are already … Read more

Freezing Rain Over Portions of the Appalachians through Tuesday (12/2)

The potential for freezing rain has increased for tonight through Tuesday across portions of Pennsylvania, Virginia, and West Virginia. A cold front moving through the region will allow temperatures to drop below freezing later today and into tonight. The 12Z Wilmington, Ohio sounding revealed a deep warm layer aloft; however, as the rain begins to … Read more

DFW: Quick-Hitting Arctic Front Arrives Monday Morning (12/1)

An unseasonably warm weekend is about to commence over North Texas, with temperatures in the mid to upper 70s.  That will come to an abrupt end first thing Monday morning, with the passage of a very shallow, quick-hitting Arctic front.   Temperatures Monday will be about 40 degrees colder than those of Sunday.  So, get out … Read more

Heavy Snow Impacting Holiday Travel over the mid-Atlantic & New England

Important Tools: Interactive & Predictive Radar | Weather Advisories Heavy snow is continuing across the mid-Atlantic and the Northeast as an area of low pressure moves northward along the eastern seaboard. Winter Storm Warnings are in effect for a large portion of the inland mid-Atlantic and New England.  Be sure to check road conditions along … Read more

Forecast Highlights for Thanksgiving Travelers

If you’re traveling over Thanksgiving, it will be an active holiday week across the nation. In this blog, we’ll go over some of the potential trouble spots across the country.  Below are some forecast highlights. Important Tools: Interactive & Predictive Radar | Weather Advisories Wednesday Pacific Northwest/Rockies: Rain and higher elevation snow will be likely … Read more

Atlanta: Thunderstorms and Heavy Rain Tomorrow (Sun 11/23)

For the past week, the global numerical prediction models, including the GFS and ECMWF, have hinted at the potential of a negatively tilted trough digging into the Southeast. They have consistently indicated a strong area of low pressure across the Arklatex propagating off to the northeast into Missouri and Kentucky.  Ahead of the low, an … Read more

DFW: Thunderstorms with Locally Heavy Rain Today (11/22/14)

A vigorous upper-level disturbance is moving into West Texas this morning.  The trough axis (and associated forcing) will not move east of the area until tonight.  As the system approaches North Texas, a copious amount of Gulf moisture continues to advect into North Texas.  As of 11 am, much of the area has already seen … Read more

Lake-Effect Snow: The Physics of Colossal Snow

Lake effect snow formation illustration

One of the most awe-inspiring forces of nature is lake-effect snow. The amount of latent energy required to produce the lake-effect convection is astounding, and in some situations, snowfall rates can reach as high as 5 to 6 inches per hour.  In this article, we discuss the atmospheric physics, dynamics, and thermodynamics responsible for the … Read more

DFW: Light sleet and light snow still expected this evening (11/16)

The Arctic front is on schedule, and the colder air is filtering into North Texas as of 11 am (Sunday, 11/16).  This map shows temperatures at 11 am. Upper-Air Data (Morning Sounding and Forecast Soundings) Throughout the morning, drizzle and light rain have been falling across North Texas with temperatures in the mid to upper … Read more

DFW: Light Snow Still Expected Sunday Evening (Sunday 11/16/14)

Published Friday, November 14 at 3:50 pm: Earlier this week, I posted about the potential for light snow on Sunday evening.  The forecast has not changed.  However, because of the timing of the precipitation Sunday evening (after temperatures drop to freezing), I am adding some light accumulations.  The greatest chance for accumulating snow is north … Read more

DFW: Scattered Areas of Light Sleet Expected Tonight (Wed 11/12)

This will be a very brief update to mention the possibility of very light sleet in North Texas tonight.   An upper-level disturbance is moving into Texas, and will provide sufficient (albeit weak) forcing for precipitation.  Temperatures will fall to near freezing in the metroplex and below freezing for areas north of Denton by 10 pm.  … Read more

DFW: Light Snow Possible Sunday Evening With Reinforcing Shot of Arctic Air

For the past 5 days, I have been closely monitoring a disturbance that will move across North Texas on Sunday/Sunday night.  Every meteorologist who has been watching the model data is fully aware of the “accumulating snow” that some of the models have suggested over the past week.  One thing that legitimate meteorologists typically do … Read more

Strong Cold Front To Reach Atlanta Wednesday Evening

The long-awaited cold front will finally reach the Atlanta metro tomorrow evening (Wednesday 11/12). At this time, it still appears that the front will move through the Atlanta area during the early-evening hours. After reaching the mid 60s on Wednesday, Atlanta will be 20 degrees colder on Thursday with highs only in the mid 40s. … Read more

Heavy Rain and Colder Temperatures for DFW on Tuesday 11/4/14

A strong cold front will move through North Texas on Tuesday (11/4/14). The timing of the cold front, and rain amounts may need to be modified with future data. At this time, these are my expectations: Ahead of the front Tuesday morning, temperatures should be 65º to 70º. Temperatures will fall 15 to 20 degrees … Read more

Atlanta: First Freeze for the Southeast Still Expected

As predicted, the strongest cold front so far this season is moving south through the Midwest, and will arrive in the Birmingham/Atlanta areas this evening.     10/31 12:52 pm Forecast Update: The cold front will be moving through around 7 pm. Temperatures will fall into the 40s, especially after 8 pm. The wind will … Read more

Atlanta’s Strongest Cold Front so far this Season by Halloween Weekend

Wednesday, October 22, 2014 – There are indications that the first freeze of the season may occur in about 10 days from now (around Halloween/Nov 1/2/3).  Stay tuned for future updates. Update #1 – Thursday, October 23, 2014  ***Strongest cold front so far this season one week from tomorrow (Halloween) followed by the first freeze*** … Read more