Well the bilzzard is on it’s way we are under blizzard warning. Here is some before video I will have some more video throughout the event, you should see an update as soon as the snow starts.
NWS Norman, OK has issued a PDS (Particularly Dangerous Situation) Winter Storm Warning! 1-30
Jan 30With a major system on the way the PDS WSW makes perfect sense! I will try and post some current info about the upcoming winter storm on thestormpatrol.com and on Facebook and Twitter ASAP!
When we think of PDS (Particularly Dangerous Situation) most of the time we are talking about a PDS Tornado Watch but not in this case. The NWS uses the term PDS to enhance the wording of a watch or warning. If you see a PDS Tornado Watch this means there is a heightened chance for strong to violent tornadoes in the watch area I.E a tornado outbreak! Sometimes the SPC will issue a PDS Severe Thunderstorm watch typically when a long lived derecho is forecasted.
Back to the PDS Winter Storm Warning, here are some questions for thought maybe someone can answer for me.
Is this the first PDS Winter Storm Warning?
If not when and where was the last one?
What are the requirements for a PDS WSW?
Read more to see the PDS Winter Storm Warning text.
Here is the NAM models solution for the event at 18z or noon cst Friday. It shows a cold front / dry line across KS / OK / TX moving into AR. Keep in mind this is just a model output it’s by no means perfect but I’m liking the NAM output over the GFS at this point the GFS as always is too fast it has things all the way to St Louis, MO at 18z.
Click to enlarge. Image from weather.cod.edu
Tyler.
Looks like we could see some severe storms and tornado or two on New Year’s Eve across TX, LA, and MS. The main issue I have is moisture return, if the southerly flow can stay in place long enough to get some deep moisture we could see severe storms quite a ways north into MO and IL! Will just have to see how it plays out over the next few days.
Tyler.
I took this pic when the moon was just about 100% eclipsed. I took the pic with Olympus SP-550UZ I have Nikon D80 DSLR but the only lens i have is a 18-135mm the Olympus is 28-504mm equivalent amazing cam for the price, I would really like to get a big 800mm or so for the D80 but that would cost way to much and it would only be good for stuff like this.
Tyler.
Looks like I could see the first snow of the year around SE KS and we could even have some storms down South in the Dec 11th-13th time frame according to the GFS. Will just have to wait and see how things progress but needless to say I will be closely watching this system.
Tyler.
Here is a radar comparison of the April / November 2010 Yazoo City, MS tornadoes. The November 29th 2010 tornado pictured on the left was 150yards wide and rated EF-2 with winds of 115mph. While the April 24th 2010 tornado was a 1.75mile wide EF-4 monster with winds of 170mph! It’s not often we get to see two tornadoes that happen within months of each other taking more or less the same path across a city. While this is a terrible double blow to a city that hasn’t even rebuilt from the first storm it provides a unique opportunity for science. Both parent storms where moving close the same direction and both tornadoes hit structures so the speed can be determined. With both storms being the same distance from NWS Jackson, MS NEXRAD radar a real world comparison can be made. As soon as the level2 data is available on from NOAA I will do a detailed comparison for TheStormPatrol.com.
NWS Jackson, MS Confirmed that Yazoo City, MS was struck with an EF2 tornado last night. Yazoo City was struck with an EF4 tornado back in April of this year only 7months ago.
UPDATE: I have added the 00z RAOBs from the area. If the storms can fire ahead of the linear forcing we could see another outbreak!
Here is a hodograph from our custom shear vector analysis program.
The hodograph shows a critical angel of 79deg while 90deg is perfect it has been our experience that lower then 90deg is more favorable then greater 90deg. The environment is in constant flux so this is a very hard parameter to measure but when you can get a storm close to a radar site and surface site that haven’t been overtaken by a boundary the data tends to be pretty good.
To read more about the critical angel and shear vector analysis click below to see a 2008 paper
Discriminating between Tornadic and Non-Tornadic Supercells: A New Hodograph Technique
SPC Products- SPC - No MDs are in effect as of Sat May 19 21:39:01 UTC 2012 May 19, 2012
- SPC Severe Thunderstorm Watch 282 Status Reports May 19, 2012
- SPC Severe Thunderstorm Watch 281 May 19, 2012