Atlanta’s Top 20 Snowstorms & Temperature Trends

Atlanta’s biggest snowfall events of all time are listed in the table below. The most snow ever recorded on a single day in Atlanta was on January 23, 1940 when 8.3 inches fell. The top 10 snowstorms in Atlanta have a median accumulation of 4.2 inches. View the full list We often hear the cliche: […]

Watch a Full Year of Changing Seasons from Space

I love this animation.  After spending years trying to explain these concepts, along comes high-resolution satellite images sewn together from a Lagrangian perspective to create a fast animation that actually shows the seasons changing as Earth tilts on its axis from equinox to solistice to equinox and so on. Credit: Simon Proud, researcher in the […]

What is the Difference Between a Hurricane and a Typhoon?

Answer:b>  A hurricane is the exact same meteorological phenomenon as a typhoon. The difference is simply a function of the storm’s location relative to the International Date Line (180ºW).  A “hurricane” west of the International Date Line (IDL) is called a typhoon.  The term is believed to have its origins in Sinitic, one of the […]

Hurricane Records Broken As 3 Major Pacific Hurricanes Coexist

On August 29, 2015, for the first time on record, three *major* hurricanes were active simultaneously in the central/eastern Pacific (east of the International Date Line, 180ºW).  A major hurricane is defined as a category 3 or higher.  Yet another record was set at 10 pm CDT. 8 pm CDT 8/29: Three Major Hurricanes Set […]

Hurricane Katrina: The Dire NWS Warning That Saved Lives

On this, the -year anniversary of Hurricane Katrina’s final landfall east of New Orleans, I wanted to share some graphics and the very rare, dire warning issued the National Weather Service in Slidell, Louisiana that likely saved many, many lives. Radar Loop at Landfall   Satellite Loop at Landfall   Location of the NWS Brief […]

Hurricane Hunter P-3 Tail Radar on Google Earth

Prior to the advent of weather satellites and aircraft reconnaissance of tropical cyclones during the mid-20th century, the loss of life due to unexpected, landfalling hurricanes was tremendous. In 2015, hurricane forecasting continues to improve thanks to ongoing upgrades in observational technology (aircraft, dropsondes, tail radar, etc.), computational resources, improved numerical prediction models (model resolution, […]

DFW: Strong August Cold Front On Track For N. TX Wed (8/19/15)

Summary & Forecast Verification [Thursday 8/20/15 8 pm] ***Today Among Our Coldest August Days on Record*** A few days ago, I predicted that our strongest cold front in 3 months would move through North Texas (below). The forecast worked out perfectly (and to the contrary of the armchair meteorologists who declared otherwise on the day […]

How Many Lives Have Been Saved By Improved Hurricane Forecasts?

Trends In The Ratio Of Damage To Deaths Caused By United States Land-Falling Hurricanes 24th AMS Conference on Hurricanes and Tropical Meteorology (2000) Chris C. Robbins and James Gross National Hurricane Center, Miami, Florida   We have estimated that, if the pre-reconnaissance trend continued at the time of Hurricane Andrew, approximately 4,354 deaths may have […]

Rapid Intensification of Tropical Storms & Hurricanes in the North Atlantic

A Climatology Of Rapidly Intensifying Tropical Cyclones In The North Atlantic Basin, 1975-2000 25th AMS Conference on Hurricanes and Tropical Meteorology (2002) Chris C. Robbins and Stacy R. Stewart National Hurricane Center, Miami, Florida   1. Introduction Rapidly intensifying tropical cyclones pose a significant forecast problem for operational meteorologists. Unfortunately, the climatological nature of such […]

Hurricane Irene’s (1999) post-landfall intensification and downbursts

Mesocyclone-Induced Downbursts Associated With The Landfall Of Hurricane Irene (1999) Over S. FL 24th AMS Conference on Hurricanes and Tropical Meteorology Stacy R. Stewart and Chris C. Robbins Tropical Prediction Center, Miami, Florida   1. Introduction This paper examines the occurrence of multiple damaging downbursts or “miniswirls” with the passage of Hurricane Irene across South […]

What is the water cycle and can the cycle be disrupted?

A follower asked, “if the water cycle is real, how can there be water shortages?” In light of the recent drought in Texas, which ultimately ended with the historic rainfall during the month of May 2015, and the ongoing devastating drought in California, I thought I would make this brief post. What is the Water […]

May 2015: DFW’s Wettest May on Record

May 2015 was an exhausting month for forecasters in Oklahoma and Texas. One storm system after another brought enormous rainfall and significant flooding to many areas.  I will try to post some dynamics/thermodynamics analyses or a general recap of each individual storm system in a future addendum to this post.  For now, I wanted to […]

Dallas & Irving Tornado on Sunday, May 24, 2015

Many of you may have been awakened by the Tornado Warning in western Dallas/eastern Tarrant Counties early Sunday morning. The tornado sirens sounded across the warned area, and even in my area near the Grapevine/Southlake border. Fortunately the tornado in Irving dissipated as it moved north-northwest toward the residential areas of Carrollton. As it turns […]

DFW: Heavy rain, thunderstorms, & flash flooding Memorial Weekend

Read Initial Forecast #1 | Use Radar/Advisory Tools on the DFW Page Final Update [Rainfall Record Broken – Sunday 5/24] DFW Airport received 3.31 inches of rain today (Sunday, May 24, 2015), which breaks the record for the greatest amount ever recorded on this date. The previous record was 3.28″ set in 1908. Records date […]

Strong Tstorms & Flash Flooding Poss for DFW Sat-Sun 5/9 – 5/10

Below is my partial/subjective surface analysis using 2 pm data. There is certainly a convoluted mess of fronts associated with this surface low. However, the dry line is obvious with at least one dry-line bulge southwest of the metroplex. Surface-based convective available potential energy (CAPE) in that area exceeds 4,000 J/kg. There is a θe […]

Historic Rainfall Event in the Oklahoma City Metro on 5/6/15

Slow-moving, training supercells brought enormous rainfall amounts to the southern Oklahoma City metro on Wednesday, May 6, 2015. Rainfall rates of 3 to 4 inches per hour occurred with the thunderstorms. Update: The rainfall total has been updated to reflect the final official amount as confirmed by the NWS.  The change was minor (a tenth of […]

DFW: Tstorms Late Weds (4/22) May be Severe w/ Localized Flooding

Update #2 [Wednesday 4/22 10:40 pm] ***Severe Thunderstorm Watch*** A Severe Thunderstorm Watch has been issued for the thunderstorms that developed to the northwest as predicted. These continue to move southeast. The watch is in effect until 4 am.  Read my initial forecast discussion posted the day before, on Tuesday 4/21 Update#1 [Radar Update – […]

DFW: Severe Thunderstorms Likely Saturday Evening (4/18)

Special Update [Saturday 4/18 7:40 pm] Significant thunderstorm wind damage is likely in the path of this downburst throughout Tarrant County, with winds in excess of 70 mph possible. It is moving northeast through Tarrant County. Velocity Image at 7:40 pm: Fourth Forecast Update [Saturday 4/18 5:45 pm] ***Severe Thunderstorm Watch Until 1 am*** Includes […]

Much-Needed Rain For N. TX Today (4/8) & Severe Tstorms Tomorrow (4/9)

UPDATE: Thursday 4/9 at 4 pm [Update Regarding Convective Initiation]: My map yesterday placed convective initiation along a McKinney to DFW Airport to Stephenville line.  I am adjusting it west by about 20 miles to from Pilot Point to Fort Worth to Stephenville.  This shift wouldn’t normally be significant (it’s within the margin of error), […]

Spring Freeze for the Southeast Next Weekend (3/28-3/29)

→ Read my initial forecast published on Saturday, March 21 Final Update – Observed Low Temperatures on the morning of March 29, 2014 The freeze that was predicted for over a week verified perfectly. All locations in northern Georgia fell below freezing for 4 or more hours Saturday night/Sunday morning. I’ve gone through the observations, […]

Thunderstorms with Heavy Rain Likely over N TX Thurs Night & Friday (3/20)

Update #5 Friday 3/20 at 1:30 pm [Final Update]:   A few official rainfall amounts over the past 24 hours Sister Grove Ck (Collin): 1.86 Melissa (Collin): 1.43 Prosper (Collin): 1.24 Dallas, Irving Blvd (Dallas): 0.51 Gainesville (Cooke): 1.56 Valley View (Cooke): 1.67 Denton (Denton): 0.81 Ladonia (Fannin): 2.93 Celeste (Hunt): 2.17 Alvord (Wise): 1.14 Update […]

What is the Weather-Ready Nation Initiative?

The United States is also home to the most frequent occurrence and the largest variety of extreme weather events of any other country in the world.  These events include, but are not limited to, extreme heat/cold, snowstorms, tropical storms and hurricanes, droughts, areal and flash floods, hail storms, and tornadoes.  While none of this is […]

DFW Snow and Sleet Totals for March 4-5, 2015 (3/4 & 3/5)

Below are details of the March 4th-5th 2015 snowstorm in North Texas. You may be interested in these related pages: DFW snowfall records dating back to 1898 List of the worst snowstorms to hit DFW (top 20) 2015 snow and sleet events (2014-2015 winter) Current snow cover map (updated daily) Daily Snowfall Accum Stats for […]

Atlanta: Mid 70s on Wed (3/4), Arctic front Thursday (3/5)

For a brief moment, it will feel like spring in northern Georgia.  I expect temperatures on Wednesday (3/4) to be in the lower 70s.  However, an Arctic front will move through Atlanta on Thursday morning, with temperatures falling through the 30s.  Low temperatures Friday morning (3/6) will be in the lower 20s. A lot of […]

Winter Storm Expected for North Texas Wednesday (3/4)

Final Update: Thursday 3/5 9 pm:  View the storm reports Discussion #6 Wednesday 3/4 at noon: ***Winter  Storm Warning is in Effect*** I have been analyzing vertical thermodynamic profiles at various times over the next 15 hours and the evolution of the atmosphere continues to support a transition from rain to freezing rain this afternoon, […]

Observed Snowfall Amounts in North Texas on Friday, February 27, 2015 (2/27)

The map below shows the actual snowfall accumulations on February 27, 2015 in North Texas.  Parts of North Texas received over 6 inches of snow. The accumulation map was prepared by the NWS in Fort Worth using more than 200 ground reports. Official Metroplex Airport Reports DFW Airport: 2 inches. Broke the previous daily record […]

Snow Expected over North Texas and DFW on Friday 2/27

Final Update Saturday 2/28: Observed Snowfall Totals The following map was prepared by the National Weather Service in Fort Worth and is a graphical representation of over 200 reports gathered via social media, storm spotters, and official observers.  I will gather additional information that will hopefully provide additional details/specifics.  All updates starting with my initial […]