Category Archives: National Weather

Forecasters increase hurricane chances

NOAA says there is a greater chance for hurricanes in the coming months.
NOAA says there is a greater chance for hurricanes in the coming months.

In their August update to hurricane season forecasts, experts at the National Oceanic and Atmospheric Administration (NOAA) have changed their predictions for the season and now expect a greater chance of hurricanes this season.  They are now predicting an “above normal” season with 14 to 18 named storms – up from the 12 to 16 they predicted in May.

The forecasters now believe there is an 85 percent chance that this above normal trend will take place (up from 65 percent in May). 

“Leading indicators for an above-normal season during 2008 include the continuing multi-decadal signal – atmospheric and oceanic conditions that have spawned increased hurricane activity since 1995 – and the lingering effects of La Niña,” said Gerry Bell, Ph.D. of NOAA’s Climate Prediction Center. “Some of these conditions include reduced wind shear, weaker trade winds, an active West African monsoon system, the winds coming off of Africa and warmer-than-average water in the Atlantic Ocean.”

The updated 2008 hurricane outlook.
The updated 2008 hurricane outlook.

Thus far in 2008 there have been five named storms and the most active hurricane period – August to October – is just now beginning.  Will this prediction hold true?  Unfortunateley forecasters have struggled in recent years with their predictions.  Last year NOAA predicted 10 hurricanes and only six formed. The year prior, 2006, nine hurricanes were forecasted by NOAA but only five formed.  In 2005, the year Hurricane Katrina devastated New Orleans in the worst U.S. natural disaster, the forecasts underestimated storm activity.

Regional Weather Now at Rocky Mountain Weather Network

We are excited to announce a new regional weather website – the Rocky Mountain Weather Network (RMWN) – that you will find at www.rockymountainweather.net.

One of the prominent members of the personal weather station (PWS) community, Ken True of SaratogaWX, recently hatched the idea of a series of regional weather networks, all being fed data from weather stations in the areas they serve. Tony of ThorntonWeather.com has agreed to manage the regional network for the Rocky Mountain area encompassing Colorado, New Mexico and Wyoming.

These networks are to provide an overview of weather conditions across the region and will provide links to the stations within. The main page of the site displays a “mesomap” with a rotating display of current weather conditions across the three states. At the current time, 18 stations are online with RMWN and more are joining daily.

The Rocky Mountain Weather Network will not only serve as an online repository for current weather conditions in the area, but we are also hoping to see it grow into an online community . To this end, online discussion forums have been created on the RMWN website that anyone can participate in. These will be frequented not only by weather station owners / operators but also by the public and anyone just generally interested in the weather. The community will be a great way for anyone interested in the weather to congregate online and discuss their common interests.

So please check out the Rocky Mountain Weather Network at www.rockymountainweather.net and be sure to stop by the discussion forums for some weather talk!

Rocky Mountain Weather Network

Vehicles and Tornadoes – A Deadly Mix

A truck displays the damage a tornado can do to a vehicle.This past weekend a deadly spate of tornadoes struck Oklahoma and Missouri, killing at least 22 people. More than a third of those died in cars despite the fact that vehicles are one of the worst possible places to be when a twister strikes.

“It’s like taking a handful of Matchbox cars and rolling them across the kitchen floor,” said Sgt. Dan Bracker of the Missouri State Highway Patrol, surveying the damage in and around Seneca, near the Oklahoma line, the hardest hit area. “This is devastating.”

Experts warn that just about any place is better than a vehicle. In the extreme situation that you simply cannot get away from a tornado or find more appropriate shelter, abandon your vehicle immediately. Lie down in a ditch or culvert and cover your head. This isn’t a particularly good option, but it is safer than remaining in a vehicle.

If you haven’t already, you may wish to read our “Severe Weather 101 – Tornadoes” for more information.

Click here for a related news story.

NOAA: Coolest Winter Since 2001 for U.S. & Globe

A cold winter!This week NOAA’s National Climatic Data Center announced that from December 2007 to February 2008 temperatures across the United States and the globe were their coolest since 2001.  In the contiguous United States, the average winter temperature was 33.2°F which ranks it as the 54th coolest winter since national records began in 1895.  Globally, the combined land and ocean surface temperature was the 16th warmest on record for the period.

In terms of precipitation, as everyone here in Colorado knows, large swaths of the country experienced at or well-above normal levels of precipitation.  Indeed, some basins here in Colorado were in excess of 150% of normal.  Record February precipitation in the Northeast helped make the winter the fifth wettest on record for the region. New York had its wettest winter, while Pennsylvania, Connecticut, Vermont, and Colorado to the West, had their second wettest.

The charts below give a good view of both temperature and precipitation for the winter.  You can also view the NCDC’s complete summary on their website here.

Winter Temperatures     Winter Precipitation

Cleanup Continues After 57 Die In Tornadoes

Tornadoes hit the southThis past Tuesday saw over 40 tornadoes touch down across Tennessee, Arkansas, Missouri, Kentucky, Alabama and Mississippi.  The death toll from these storms currently stands at 57 making it one of the 15 worst tornado death tolls since 1950, and the nation’s deadliest swarm of tornadoes since 76 people were killed in Pennsylvania and Ohio on May 31, 1985. 

It is currently believed that because February tornadoes are not all that common, simple human nature may have been the root reason for so many fatalities.  Simply put, people weren’t expecting them or believing the warnings that were issued well in advance.  From USA Today: 

“Because February tornadoes are relatively rare, many residents didn’t respond quickly to warnings from weather forecasters because they didn’t believe the threat was serious until a storm was upon them. In fact, February tornadoes are “almost an annual event,” Brooks said. In 2007, there were three killer tornadoes in February — two in Florida and one in Louisiana — that killed a total of 22 people. During the most common months for tornadoes — March, April, May and June — fatalities typically are 15% lower and injuries are 22% lower because people expect such storms and prepare for them, said Dan Sutter, an economist at the University of Texas Pan American who has studied tornadoes for eight years.”

This truly is a tragedy and one has to wonder how many of these deaths could have been avoided had residents simply heeded the warnings that were issued.  For more information, please see:

USA Today – Cleanup continues after devastating tornadoes

The Tennessean – Nashville newspaper’s special section about the storms

Memphis Radar Image

Memphis radar image from February 5, 2008

Wrong again? Despite predictions, 2007 may rank as most inactive hurricane season in the last 30 years.

HurricaneThis marks the second year in a row forecasters predicted above normal hurricane activity only to have it be the opposite. Despite the “sky is falling” predictions about how global warming is the cause of all sorts of disasters, including an increased threat of hurricanes, we find the opposite is actually occurring. For more information see this page from the Center for Ocean-Atmospheric Prediction Studies.