Wednesday, July 23, 2014
Beach Hazards Statement for the Great LakesAlways hearing about rip currents risk with passing tropical storms or when those long period swells line up just perfectly from a passing storm. The same weather setup can also set up over the great lakes providing some great wave action, but it also poses a risk. The National Weather Service has a whole page dedicated to Great Lakes Hazards including rip currents.
Tuesday, July 22, 2014
Typhoon Matmo makes Landfall Here
|Image source: http://www.kuriositas.com|
It is called the Dragon Bridge to the Platform of the Three Immortals and you can read more about it here. It looks amazing, the only problem was I found it by looking for what is around the landfall of Typhoon Matmo. It is ironic the only reason I looked into this was by tracking a typhoon. That very typhoon is now lashing this exact spot.
Friday, July 18, 2014
Down the Shore Watch the Wind DirectionGrowing up in Stone Harbor, NJ I loved those west wind (offshore) days since it made for great waves. I could deal with the colder water and since I was in the water or off the beach, the flies didn't bother me. Times have changed now and anytime I am asked about beach weather I always check the wind first, then the chance for sun or rain.
West Wind is Not Good
- Quickly drops the water temperature due to upwelling
- Prevents sea breeze so it gets hot
- Brings in the flies from the marshes and mainland
What to Look for on a Weather Map
A cold front normally means a drop in temperatures, but plan for the opposite at the beach. This was from last week as a large storm over Eastern Canada brought a series of fronts through the Mid-Atlantic. Normally behind the front the wind will be out of the west or northwest. This blows off shore in NJ.
Once the front passed and the wind direction changed the water temperature dropped quickly. So when you see a cold front (blue with triangles) then most likely expect a colder ocean to follow. In this case a day after the front passed the water temperature was stuck in the 50s.
Little or no Sea Breeze
You want the sea breeze to develop to enjoy you day on the beach. Often the temperature drops in the afternoon thanks to an onshore wind. Plus the flies from the back bays and mainland will stay there as the wind is blowing onshore. When there is a west wind the sea breeze can't develop so it will really start to heat up and you will be attacked by black flies, greenheads, and mosquitoes. This is a great article on the sea breeze in New Jersey.
Don't trust your Phone's Temperature Reading
This has gotten a lot better in recent years only due to more data available and better programs pulling that data but you still can't be sure. The official observation site for Atlantic City, NJ is at the airport well inland and that may be what some programs look for when you enter your location. The temperature difference could be 10 to 20 degrees if a sea breeze develops between there and the beach. If you see a west wind then it is probably about the same but you may find it much cooler than what your readings say depending on where the sensor is located.
What to look for:
- Watch for an approaching cold front, that might indicate a wind direction change
- West to northwest winds prevent the sea breeze
- Warmer air temperature
- Colder water temperature
- Flies Everywhere
- Don't trust your phone. Sometimes the air temperature will be much cooler right at the beach then a block or two away
Thursday, July 17, 2014
Still my Favorite Analysis ToolAs my Synoptic Meteorology Professor Dr. Ken Crawford would say, "There is a lot of Meteorology happening there." Seems like that can always be said every time you look at a 1km visible satellite image. Put it into motion and then you have something truly amazing.
Here you go, I won't add any loops so no need to lock the door or dim the lights.
GOES WestStands for Geostationary Operational Earth Satellite and has 2 satellites west and east. Best I found was from Here. Great menu and offers a low and hi res version. This was from July 17th and shows the western US.
|Provided courtesy of University of Wisconsin-Madison\|
Space Science and Engineering Center
1km Visible Images of the Current Washington State Wildfire
|Got this from the NWS in Pendleton, OR|
The National Weather Service has some great tools to get close up views of any area. This image was from the Pendleton, OR office. These closeup views you can really see what is happening with the weather that day. This shows the smoke from the fire complexes in Washington State along with the low clouds due to the on shore flow in Western Washington.
This Visible Satellite has some limitations:
- Only can be used during daylight hours
- May not distinguish between low and high clouds (Both look white)
- Clouds and snow can look the same
Lots of Meteorology Happening Here
|Photo Courtesy NEXLAB-College of Dupage|
From just this image you can determine:
- Areas affected by the smoke
- Inversions keeping the low clouds and the smoke trapped in the valleys.
- An estimate of the wind direction (Northwest)
A Look from Below
|Washington Department of Transportation|
Smoke has lifted just a bit but you can see the extent of the smoke in this traffic camera which is in Western Washington.
Another Great Resource is NASA
One site that always deserves a daily visit is NASA Earth Observatory. It is not just a satellite gallery but also contains many other graphics that result from NASA research. Along with the image they will often highlight certain features and offer an explanation on the impact of the event.
Tuesday, July 15, 2014
Rapid Intensification Prior to LandfallRammasun went from a Tropical Storm with 60 mph wind to a Typhoon with 125 mph wind in just 36 hours. The storm made landfall in the Central Philippines Tuesday. The satellite loop shows a clear eye develop around a solid area of thunderstorms just before the storm impacts land.
Warm Water with little Wind Shear
Stremlines and contours is what it may look like but this is a map that charts wind shear. The change of wind direction or speed with height can actually rip apart tropical storms. With very low shear and warm water a storm will not be held back from Intensifying.
|Highlighted area shows an area with low wind shear. This is the area that Rammasun moved through just prior to landfall in the Philippines.|
Just Like Hurricane HumbertoHad to look through a few years of data but remembering where it happened made it a lot easier. Hurricane Humberto went through a similar intensification prior to making landfall in Texas back in 2007.
The data from the National Hurricane Center shows that the storm went from a depression to a Hurricane in under 24 hours.Date: 12-14 SEP 2007 Hurricane-1 HUMBERTO ADV LAT LON TIME WIND PR STAT 1 28.10 -95.20 09/12/15Z 30 1006 TROPICAL DEPRESSION 1A 28.30 -95.10 09/12/18Z 40 1005 TROPICAL STORM 2 28.60 -94.90 09/12/21Z 45 999 TROPICAL STORM 2A 28.80 -94.80 09/13/00Z 45 998 TROPICAL STORM 3 29.00 -94.60 09/13/03Z 55 995 TROPICAL STORM 4 29.40 -94.40 09/13/05Z 70 992 HURRICANE-1 5 29.90 -94.10 09/13/09Z 75 986 HURRICANE-1
|Hurricane Humberto Radar just after Landfall|
What Does this mean for the Philippines?The Philippines Government had already ordered evacuations for many coastal areas and issued alerts in the capitol of Manila for typhoon force winds. The storm should lose some intensity over land but is forecast to increase in strength before impacting Vietnam and China this weekend. The storm can easily be tracked from many agencies.
Monday, July 14, 2014
Severe Weather Outlooks and Advisories
|Convective Outlook from the SPC|
- Individual 1,2, and 3 day outlook
- Day 4-8 outlook
- Gives threat type on the first day
|Mesoscale Discussion Page from the SPC|
|Thunderstorm Watch from the SPC|
Warnings are Issued by the Local NWS Office
The Storm Prediction Center is located in Norman, OK and issues the outlooks, mesoscale discussions, and watches. Warnings are covered by the individual offices throughout the country. The Philadelphia National Weather Service Office is in the watch area and would put warnings out for the individual storms. A warning is issued when severe weather is happening and will last only during the length of the severe storm.
So are you at risk of severe weather?
- Check the Storm Prediction Center Outlooks days in advance
- This will give you an idea of the severe weather threat
- If your in an area expected to get severe weather check for Mesoscale Discussions that day
- These are scientific but you may get the idea of how big threat is
- Keep an eye out for Weather Watches
- Remember severe weather can happen in and around the watch area
- If your local office issues a warning then take cover until the warning expires
It's Still the WeatherSevere storms can still happen when there was no risk indicated or watch issued. Often the outlooks are issued for large scale events, a single storm can become severe and not have a warning issued until the severe conditions are reported by a spotter. Always be aware of changing weather even it it looks like no threat exists.
Tuesday, July 8, 2014
From Hurricane Arthur to Typhoon Neoguri
|It may not be as smooth as the National Hurricane Center but you can still track Typhoon Neoguri. The track looks similar and aside from a few added geometric shapes, is the exact same track you would find coming from the NHC.
Cone of Uncertainty
|The forecast issued by any agency is a position estimate for the center of the storm at a given time interval. The storm center at that time has a 67% (70% with the Japan Forecast) of falling within the circle. A line is drawn connecting all the circles and you end up with a forecast cone.|
Ignore the Forecast Track Line
|The NHC does not draw the center line on the forecast track page to avoid misleading the public into a false sense of security should they see the line not crossing their area. The forecast from Arther is a perfect example Above. The center track line would have remained off the coast but the western edge of the cone covered the actual track of the storm. As stated by the Hurricane Center it is important to remember that hazardous conditions could exist outside the cone since it is only represents the center of the storm and not the size.|
|The Joint Typhoon Warning Center (JTWC) is a task force that covers the Pacific and the Indian Ocean. The forecast graphic is not a position probability estimate but a single track with the circles representing the wind speed field.|
Japan Meteorological Agency
|Navigating this page is a little tricky and there are a number of menu options but the track issued is very similar to the National Hurricane Center in the US. The only difference is the probability circles remain on the map which can make it look very geometric. If you look at the center line (then ignore it as stated) you can see each circle with the cone drawn along the outside.|
Monday, June 30, 2014
Take the Science to them
It was a simple invitation I recevied through twitter.
|An invite to join the chat from @BlackPhysicists|
I am never one to turn down a chance to talk weather, but I wondered how much talking would happen though a character limited medium like Twitter.
Science Student Chat or #scistuchat is a monthly weather chat organized by Adam Taylor (@2footgiraffe), a high school science teacher from Nashville, TN. He noticed that many of his students were already on Twitter for what he calls "less educational reasons" while at the same time a lot of scientists are Tweeting science. #Scistuchat was a way to connect the two.
The 140 Character Limit vs the Hashtag
Knowing the limitations of the tweets was my one concern. Just how much information can you get out there in 140 characters or less that must include the #scistuchat tag. After watching the video Adam put together it was clear that my answers would be limited.
After loading up the laptop (easier to type) and searching for the #scistuchat I noticed the first question was already asked and the Extreme Weather chat was well underway. I answered a simple question about extreme weather with a simple answer, the most I could do with the tweet, but then I realized the true value of the chat...chatting!
Over the next few questions I felt I was able to quickly scan the previous answers and continue a thought train or compliment another answer. The scientists were not just giving simple self-contained answers but were working through a whole complex answer. A quick reload and scan of the #scistuchat hashtag and you could easily pick up how the answer was evolving.
Data and "more information links" could also be added to help students taking part in the chat look into a topic further. A how do you track severe weather question started off with simple answers but ended with links to the storm prediction center or even university model forecasting web pages.
From Information to Inspiration
Even with all the scientists working to come up with a complex answer there is only so much information you can get from the chat. But in the end I realized it may not even be about the chat at all. The chat itself was putting students with a general interest in a topic in contact with Scientists in that field. This could lead to a general interest to becoming a career instead of something that was covered last week.
Taylor noticed that after each chat, no matter what the topic, there was always a follow up period where the subject was still discussed. Some of the students actually tweeted directly with the scientists for weeks following the chat. This type of interaction to a high school student with a general interst could help steer them down that career path. Something that would have never happened without a simple question and answer period on Twitter.
The #Scistuchat tag will continue to appear on Twitter with a different science related topic each month. The general page has the next chat topic along with a instructional video. You can follow Adam Taylor on Twitter (@2footgiraffe) to see what type of science outreach he will be working on next. I look forward to the next weather chat.