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ABC 33/40 Podcast for Tuesday Morning, June 28, 2005
June 28, 2005, 3:45 am
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Intro To Meteorology
June 27, 2005, 6:07 pm
The first weather class I took in college, Introduction to Meteorology, explained many basic features that a weather geek like myself found fascinating. One process that has been covered numerous times in many different geoscience areas is orographic uplift.
When I initially heard the term in World Geography, I was intimidated by the phrase. However, I later learned over and over again the way a mountain acts as a weather maker. The word “orographic” refers to a mountain while “uplift” addresses the motion that mountains force air to take. It all begins with a parcel of traveling air. Once this parcel reaches a significant obstruction (like a mountain), it is forced upward. One foundation of meteorology is that warm air can hold more moisture, water vapor, than cold air can. Therefore, the parcel of air can hold less moisture as it is forced upward into cooler air. This causes condensation and precipitation on the windward side of the mountain. Once air passes the apex, it warms as it travels down the mountain. The parcel is exhausted of excess moisture at this point, causing dry weather on the leeward side. This process occurs in the western United States because of the Sierra Nevada and Rocky Mountain ranges. For example, parts of California receive adequate rainfall each year while the Midwest, or leeward sides, are desert. The same occurs in western Europe. Although an easy lesson in Meteorology, orogarphic uplift can be a major element in weather.
By the way: For those of you trying to validate the weather folklore from Monday, I have two answers for today.
1) When clouds appear like towers, the Earth is refreshed by frequent showers. These towers refer to a cumulonimbus cloud, a cloud associated with severe weather.
2) Rain foretold, long last. Short notice, soon will pass. I do not claim that this is the original explanation, but the phrase applies for the present day. When there are “popcorn” showers, they are not forecasted days in advance like long-lasting meso complexes are. Keep reading for more explanations!
When I initially heard the term in World Geography, I was intimidated by the phrase. However, I later learned over and over again the way a mountain acts as a weather maker. The word “orographic” refers to a mountain while “uplift” addresses the motion that mountains force air to take. It all begins with a parcel of traveling air. Once this parcel reaches a significant obstruction (like a mountain), it is forced upward. One foundation of meteorology is that warm air can hold more moisture, water vapor, than cold air can. Therefore, the parcel of air can hold less moisture as it is forced upward into cooler air. This causes condensation and precipitation on the windward side of the mountain. Once air passes the apex, it warms as it travels down the mountain. The parcel is exhausted of excess moisture at this point, causing dry weather on the leeward side. This process occurs in the western United States because of the Sierra Nevada and Rocky Mountain ranges. For example, parts of California receive adequate rainfall each year while the Midwest, or leeward sides, are desert. The same occurs in western Europe. Although an easy lesson in Meteorology, orogarphic uplift can be a major element in weather.
By the way: For those of you trying to validate the weather folklore from Monday, I have two answers for today.
1) When clouds appear like towers, the Earth is refreshed by frequent showers. These towers refer to a cumulonimbus cloud, a cloud associated with severe weather.
2) Rain foretold, long last. Short notice, soon will pass. I do not claim that this is the original explanation, but the phrase applies for the present day. When there are “popcorn” showers, they are not forecasted days in advance like long-lasting meso complexes are. Keep reading for more explanations!
Summertime Is Here
June 27, 2005, 3:13 pm
The Monday afternoon map discussion video is on the server:
http://beta.abc3340.com/weather/video.hrb
I know the summer solstice was last week, and you can sure confirm that by looking at the maps today. All of the good action in the mid-latitude westerlies is way up north; over the northern U.S. and Canada. The weather here will be very slow to change over the next seven days.
Late June in Alabama means very warm and very humid weather, and there will be sufficient moisture for scattered showers and storms on a daily basis. A weak upper air circulation center is north of the state now, and should meander around while weakening through mid-week. The WRF still suggests the best chance of a shower tomorrow will come along and south of I-59, while the NAM wants to paint the best coverage of showers over the southeast part of the state, generally southeast of Montgomery.
There simply isn't enough evidence to make us vary much from the typical summer forecast for the rest of the week and into the holiday weekend.
TROPICS: Watching the mass of storms over the Gulf of Mexico; there seems to be a 40 to 50 knot speed max in that region at 300mb (jet stream level), not what you want to see for tropical development. Elsewhere the tropics are quiet....
I have about 10 people in line waiting to get into the office to see me about various issues (I hope nothing bad
... I will keep this short today and watch the video for the long story...
http://beta.abc3340.com/weather/video.hrb
I know the summer solstice was last week, and you can sure confirm that by looking at the maps today. All of the good action in the mid-latitude westerlies is way up north; over the northern U.S. and Canada. The weather here will be very slow to change over the next seven days.
Late June in Alabama means very warm and very humid weather, and there will be sufficient moisture for scattered showers and storms on a daily basis. A weak upper air circulation center is north of the state now, and should meander around while weakening through mid-week. The WRF still suggests the best chance of a shower tomorrow will come along and south of I-59, while the NAM wants to paint the best coverage of showers over the southeast part of the state, generally southeast of Montgomery.
There simply isn't enough evidence to make us vary much from the typical summer forecast for the rest of the week and into the holiday weekend.
TROPICS: Watching the mass of storms over the Gulf of Mexico; there seems to be a 40 to 50 knot speed max in that region at 300mb (jet stream level), not what you want to see for tropical development. Elsewhere the tropics are quiet....
I have about 10 people in line waiting to get into the office to see me about various issues (I hope nothing bad
... I will keep this short today and watch the video for the long story...ABC 33/40 Afternoon Podcast for June 17 2005
June 27, 2005, 12:17 pm
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by James Spann
in Podcast
Back In The Saddle
June 27, 2005, 5:48 am
The Monday morning map discussion video is on the server:
http://beta.abc3340.com/weather/video.hrb
Good to be back after a week off. Thanks to my associates for covering all the bases during the vacation... we crank out plenty of weather products and the daily schedule can make you dizzy.
We have an upper low showing up this morning just west of here, and both the WRF and the NAM show the circulation over central Mississippi this afternoon. This should generate a few scattered showers or storms later today, and both models agree the best coverage of showers will be along and north of U.S. 278, or north of a line from Hamilton to Cullman to Gadsden. Once again, I caution you trying to tell you exactly when and where it will rain on a summer afternoon is very, very hard to do. We will struggle with this issue for the next two months, and you will hear the words "scattered, mainly afternoon thunderstorms" often in the forecast.
Tomorrow, the models suggest the best coverage of showers will be along and south of I-59, or south of a line from Tuscaloosa to Birmingham to Gadsden.
The models lose the upper low later in the week, and with warmer temperatures aloft we figure the summer showers will thin out by Thursday and Friday.
HOLIDAY WEEKEND: There seems to be some hint of a surface front north of us this weekend, but I am not sure that will affect the weather here. Bottom line is that we are looking at pretty typical summertime weather for the Independence Day weekend. Hot, humid, a partly sunny sky, and the risk of a passing afternoon storm in spots. Afternoon highs not too far from 90 degrees.
TROPICS: Lots of clouds in the Gulf of Mexico, but nothing organized this morning. Elsewhere the Atlantic basin is quite and tropical storm formation doesn't seem very likely for a while...
Will have the afternoon map discussion video posted by 3:30!
http://beta.abc3340.com/weather/video.hrb
Good to be back after a week off. Thanks to my associates for covering all the bases during the vacation... we crank out plenty of weather products and the daily schedule can make you dizzy.
We have an upper low showing up this morning just west of here, and both the WRF and the NAM show the circulation over central Mississippi this afternoon. This should generate a few scattered showers or storms later today, and both models agree the best coverage of showers will be along and north of U.S. 278, or north of a line from Hamilton to Cullman to Gadsden. Once again, I caution you trying to tell you exactly when and where it will rain on a summer afternoon is very, very hard to do. We will struggle with this issue for the next two months, and you will hear the words "scattered, mainly afternoon thunderstorms" often in the forecast.
Tomorrow, the models suggest the best coverage of showers will be along and south of I-59, or south of a line from Tuscaloosa to Birmingham to Gadsden.
The models lose the upper low later in the week, and with warmer temperatures aloft we figure the summer showers will thin out by Thursday and Friday.
HOLIDAY WEEKEND: There seems to be some hint of a surface front north of us this weekend, but I am not sure that will affect the weather here. Bottom line is that we are looking at pretty typical summertime weather for the Independence Day weekend. Hot, humid, a partly sunny sky, and the risk of a passing afternoon storm in spots. Afternoon highs not too far from 90 degrees.
TROPICS: Lots of clouds in the Gulf of Mexico, but nothing organized this morning. Elsewhere the Atlantic basin is quite and tropical storm formation doesn't seem very likely for a while...
Will have the afternoon map discussion video posted by 3:30!
ABC 33/40 Podcast for Monday Morning, June 27, 2005
June 27, 2005, 3:48 am
The ABC 33/40 Podcast for Monday, June 27 is now being served by our RSS
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Hurricane Audrey (1957)
June 26, 2005, 11:47 pm
The coastline in Southwest Louisiana consists of narrow ridges no more tan 100 feet across and often not more tan three feet in elevation. North of the coastal ridge, land is at or near sea level for some 15-20 miles inland, making residents sitting ducks for a deadly Category Four hurricane.
At 10 p.m. CST on Wednesday, June 26, 1957, the U.S. Weather Bureau in New Orleans issued its regular advisory on Hurricane Audrey in the Gulf of Mexico, some 235 miles south of Lake Charles, Louisiana. The advisor stated that the storm would “bear the brunt of this hurricane Thursday.” Residents along the low lying coast of southwest Louisiana’s Cameron Parish listened to late evening news broadcasts on radio and television that told them there was no cause for alarm during the overnight hours and that they could rest well that night. Residents went to bed believing this to be the case.
Many residents would later state that they listened to the broadcasts and advisories and packed their cars, ready to leave the following morning. At 1 a.m., a special advisory was issued, stating that Hurricane Audrey was moving faster and was expected to reach the coast near the Louisiana/Texas border with winds of 100 mph and a 5-9 foot storm surge in the Lake Charles and Port Arthur area before noon that day.
They would be very surprised the next morning to find water covering much of their parish as Audrey was already impacting the area and the center was just offshore. Audrey had intensified rapidly during the night, with the central pressure dropping 35 millibars from the last reconnaissance fix during the day. Winds correspondingly increased to 145 mph and the storm surge rose from an expected 5-8 feet to a devastating 12 feet or higher. Additionally, the forward movement of the hurricane increased from 6 mph to 15 mph.
Audrey officially made landfall around 9 a.m. CST on the coast in Cameron Parish. A total of 390 people would die in the hurricane and another 192 would never be found. The U.S. Weather Bureau was sued for negligence, but prevailed in the final judgment.
At 10 p.m. CST on Wednesday, June 26, 1957, the U.S. Weather Bureau in New Orleans issued its regular advisory on Hurricane Audrey in the Gulf of Mexico, some 235 miles south of Lake Charles, Louisiana. The advisor stated that the storm would “bear the brunt of this hurricane Thursday.” Residents along the low lying coast of southwest Louisiana’s Cameron Parish listened to late evening news broadcasts on radio and television that told them there was no cause for alarm during the overnight hours and that they could rest well that night. Residents went to bed believing this to be the case.
Many residents would later state that they listened to the broadcasts and advisories and packed their cars, ready to leave the following morning. At 1 a.m., a special advisory was issued, stating that Hurricane Audrey was moving faster and was expected to reach the coast near the Louisiana/Texas border with winds of 100 mph and a 5-9 foot storm surge in the Lake Charles and Port Arthur area before noon that day.
They would be very surprised the next morning to find water covering much of their parish as Audrey was already impacting the area and the center was just offshore. Audrey had intensified rapidly during the night, with the central pressure dropping 35 millibars from the last reconnaissance fix during the day. Winds correspondingly increased to 145 mph and the storm surge rose from an expected 5-8 feet to a devastating 12 feet or higher. Additionally, the forward movement of the hurricane increased from 6 mph to 15 mph.
Audrey officially made landfall around 9 a.m. CST on the coast in Cameron Parish. A total of 390 people would die in the hurricane and another 192 would never be found. The U.S. Weather Bureau was sued for negligence, but prevailed in the final judgment.
by Bill Murray
in General Thoughts
More on Hurricane Audrey (1957)
June 25, 2005, 10:09 pm
Residents along the Gulf Coast were monitoring the progress of Hurricane Audrey on the morning of June 26, 1957. A hurricane watch had been issued on the noon advisory the previous day along the Louisiana and Texas coasts. By the morning of the 26th, forecasters knew that the hurricane was growing in size as it moved slowly northward. On the early morning advisory, the center was estimated to be about 460 miles southwest of New Orleans, moving north at 7 mph. A slow turn to the north northeast was forecast for later in the day. Top winds were 100 mph.
At 10 a.m. CST, hurricane warning flags were hoisted along the entire Louisiana coast. By that time, the center of the hurricane was some 400 southwest of New Orleans, still with top winds of 100 mph. Expected to continue moving a little east of north at 7-10 mph, the advisory indicted that the center would reach the Louisiana coast by late on Thursday. That forecast would prove to have dire consequences. The advisory called for gale force winds to begin along the coast that night with tides reaching “5 to 8 feet along the Louisiana coast and over the Mississippi Sound by late Thursday. All persons in low exposed places should move to higher ground.”
The haunting message, repeated again in the 10 p.m. advisory, said “All persons in low exposed places should move to higher ground.” In Cameron, Louisiana, a tiny hamlet separated by only a few miles of marsh from the Gulf of Mexico, residents listened to the content of this advisory on TV and radio stations from Lake Charles, about 25 miles north of the low lying community. The broadcasts were primarily intended for Lake Charles residents, and said that “there was no need for alarm tonight,: and “you can rest well tonight.”
Unfortunately, Audrey was intensifying rapidly and was picking up speed as she churned northward through the Gulf, making a beeline for Cameron Parish, and the town of Cameron, Louisiana.
At 10 a.m. CST, hurricane warning flags were hoisted along the entire Louisiana coast. By that time, the center of the hurricane was some 400 southwest of New Orleans, still with top winds of 100 mph. Expected to continue moving a little east of north at 7-10 mph, the advisory indicted that the center would reach the Louisiana coast by late on Thursday. That forecast would prove to have dire consequences. The advisory called for gale force winds to begin along the coast that night with tides reaching “5 to 8 feet along the Louisiana coast and over the Mississippi Sound by late Thursday. All persons in low exposed places should move to higher ground.”
The haunting message, repeated again in the 10 p.m. advisory, said “All persons in low exposed places should move to higher ground.” In Cameron, Louisiana, a tiny hamlet separated by only a few miles of marsh from the Gulf of Mexico, residents listened to the content of this advisory on TV and radio stations from Lake Charles, about 25 miles north of the low lying community. The broadcasts were primarily intended for Lake Charles residents, and said that “there was no need for alarm tonight,: and “you can rest well tonight.”
Unfortunately, Audrey was intensifying rapidly and was picking up speed as she churned northward through the Gulf, making a beeline for Cameron Parish, and the town of Cameron, Louisiana.
by Bill Murray
in General Thoughts
Alabama Weather Update - 6 pm
June 25, 2005, 6:08 pm
Scattered showers and a couple of thunderstorms have developed across Central and Northeast Alabama this evening. At 6:00 p.m., the showers and storms were scattered across an area bonded by Tuscaloosa, Birmingham, Clanton and Eutaw. The heaviest activity was located from near Jemison in Chilton County to Wilton in southern Shelby County. The storms are moving WSW at 25 mph. They will be accompanied by brief heavy rains, gusty winds and dangerous lightning.
Other showers and a couple of storms are over Northeast Alabama across parts of Jackson and DeKalb Counties. This activity is also moving to the west southwest.
An area of rain, associated with an upper level disturbance over Georgia, will be moving into East Central Alabama around 7:30 p.m. This activity has been decreasing slowly in intensity and coverage and should continue to weaken as it moves further west into the state.
Additional showers will be possible during the overnight hours. Showers and storms should be more widespread in coverage on Sunday, due to the proximity of the disturbance and the warm, humid nature of the airmass over the state.
Other showers and a couple of storms are over Northeast Alabama across parts of Jackson and DeKalb Counties. This activity is also moving to the west southwest.
An area of rain, associated with an upper level disturbance over Georgia, will be moving into East Central Alabama around 7:30 p.m. This activity has been decreasing slowly in intensity and coverage and should continue to weaken as it moves further west into the state.
Additional showers will be possible during the overnight hours. Showers and storms should be more widespread in coverage on Sunday, due to the proximity of the disturbance and the warm, humid nature of the airmass over the state.
by Bill Murray
in General Thoughts
Tropical Action
June 25, 2005, 8:02 am
Back from central Florida this morning and trying to catch up on weather. I will resume the map discussion video updates Monday morning; there will not any map discussion videos today or tomorrow with Brian Peters up in Boston.
Looks like we have a tropical or sub-tropical system in the Atlantic; quite frankly it looks more like a mid-latitude system:
http://www.ssd.noaa.gov/PS/TROP/DATA/RT/NWATL/VIS/20.jpg
We will find out more thanks to a hurricane hunter flight scheduled for this afternoon.
Here is the model output for the system:
http://www.sfwmd.gov/org/omd/ops/weather/plots/storm_94.gif
Interesting how the GFDL curves the thing into Georgia; but it is an outlier.
Really haven't had enough map study time this morning; Bill Murray will stay on forecast duty through the weekend and he will have more on his afternoon package over on the seven day discussion page....
Looks like we have a tropical or sub-tropical system in the Atlantic; quite frankly it looks more like a mid-latitude system:
http://www.ssd.noaa.gov/PS/TROP/DATA/RT/NWATL/VIS/20.jpg
We will find out more thanks to a hurricane hunter flight scheduled for this afternoon.
Here is the model output for the system:
http://www.sfwmd.gov/org/omd/ops/weather/plots/storm_94.gif
Interesting how the GFDL curves the thing into Georgia; but it is an outlier.
Really haven't had enough map study time this morning; Bill Murray will stay on forecast duty through the weekend and he will have more on his afternoon package over on the seven day discussion page....
by James Spann
in Tropical Weather