Disclaimer: This is not affiliated with the National Hurricane Center, Hurricane Hunters, Storm Prediction Center, or National Weather Service. ALL forecasts herein are the result of my analysis, (to which you will see me at times, insert excerpts from various agencies due to the nature of the importance of the information) and I am solely responsible for the content. As ALWAYS, follow the National Hurricane Center, National Weather Service, and your local Emergency Management officials for emergency decisions. In addition, this is strictly a FORECAST OFFICE. I CANNOT make decisions regarding travel plans, etc. My purpose, is to provide you the information, based solely on information I analyze, and the accuracy of the information at hand of the time of analysis, so you may make informed decisions.
(T. F. “Storm” Walsh)
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Please be aware, even though I do not post every night, rest assured I am continuously monitoring various areas for any significant weather. I will be taking Sundays off (family time), unless we have active systems that may be posing a threat (i.e. Tropical, Winter Weather, Coastal Storms, etc.).
I will reiterate, my forecasts are based on the available information at the time of analysis, and are only as accurate as the information analyzed and the solutions provided.
The outlined maps you were used to seeing from my F5 DATA software, are no longer around and operational. This means I have lost quite a bit of data to analyze but I will try to make the severe weather forecasts as accurate and understandable as possible.
The Storm Prediction Center (SPC), has issued an ENHANCED risk of severe thunderstorms ACROSS PARTS OF SOUTHEASTERN LOUISIANA…SOUTHERN MISSISSIPPI…AND SOUTHERN/CENTRAL ALABAMA…
Severe thunderstorms should occur Tuesday across parts of the central Gulf Coast states into the Tennessee Valley. Tornadoes, scattered damaging winds, and large hail will all be possible. The greatest severe-thunderstorm risk is expected from southeast Louisiana into southern Mississippi and southern/central Alabama, where strong gusts and a couple of strong tornadoes are possible.
SPC DAY 2 SEVERE THUNDERSTORM OUTLOOK MAPS (THIS MAP LINKED)
Probability of a tornado within 25 miles of a point.
Hatched Area: 10% or greater probability of EF2 – EF5 tornadoes within 25 miles of a point.
Based on my evening analysis of forecast severe weather and tornado indices, analysis of all parameters analyzed point to an enhanced threat. Based on analysis this evening of the NAM regional model, SPC SREF model, and CIPS deterministic model guidance, the following forecast indices and parameters were observed in analysis of about 2 hours ago for the risk areas:
SBCAPE: 1500 – 2000+ j/kg
MLCAPE: 1000 – 1500+ j/kg
SRH: 300 – 400 m2/s2
L. I.: -3 to -5
STP: 1 to 6
SCP: 1 to 11
EFF. SHEAR: 40 – 50 KTS
MID LEVEL LAPSE RATE: 6.5C
DEW POINT: 66F – 70F
REL. HUMIDITY: 90%+
Based on analysis of effective shear and helicity, supercells that develop should become rotating supercell thunderstorms with rotating updrafts. Given the lifted index, moderate CAPE, and somewhat moderate lapse rate, the possibility of some isolated large hail could be in store for some areas within the ENHANCED risk area. Given the effective shear and a little higher projected STP values, the isolated threat of a strong tornado or two (EF2+) cannot be ruled out, mainly within the enhanced risk and hatched probability outlines in the SPC outlook maps. The risk areas will also fall under the right rear entrance region of a 250 mb jetstreak, which is also favorable for severe weather development.
STP ( Significant Tornado Parameter) EXPLAINED:
A majority of significant tornadoes (EF2 or greater damage) have been associated with STP values greater than 1, while most non-tornadic supercells have been associated with values less than 1 in a large sample of RAP analysis proximity soundings.
SCP (Supercell Composite Parameter) EXPLAINED
A multiple ingredient, composite index that includes effective storm-relative helicity (ESRH, based on Bunkers right supercell motion), most unstable parcel CAPE (muCAPE) and convective inhibition (muCIN), and effective bulk wind difference (EBWD). Each ingredient is normalized to supercell “threshold” values, and larger values of SCP denote greater “overlap” in the three supercell ingredients. Only positive values of SCP are displayed, which correspond to environments favoring right-moving (cyclonic) supercells.
The following sites will explain most of these values, and will give you an idea of what to expect:
ENVIRONMENTAL INDICES AND PARAMETERS NWS
THE WEATHER PREDICTION
Currently, the main threat window for the ENHANCED risk area appears to be approximately between 12:00 p.m. CST into 12:00 midnight CST. The stronger threat should begin to diminish after this time
SPC HOMEPAGE LINK
The following are animations of both the SCP and STP currently for Monday, however slight changes are possible between now and tomorrows model runs. The animation runs from 12:00 noon to midnight CST. The greater the value, the greater the risk to an area.
NAM MODEL SCP FORECAST
NAM MODEL STP FORECAST
Please visit my site again for the severe event to use the following maps, which should update automatically, for Mesoscale Discussions and Convective Watches. You may have to refresh your browser, or click on the graphics. I am also providing the SPC homepage link, so you may get the updated information regarding any changes to the outlook:
SPC MESOSCALE DISCUSSIONS (CLICK IMAGE FOR UPDATES)
SPC CONVECTIVE WATCHES (CLICK IMAGE FOR UPDATES)
IF A TORNADO WARNING IS ISSUED FOR YOUR AREA, IMMEDIATELY TAKE STURDY AND SAFE SHELTER
The following NWS Watch / Warning map will provide local NWS information for your area. Click the image, then once it refreshes, click on your area of interest to view any special weather statements, hazards or advisories for your area.
NWS WATCH / WARNING DISPLAY (LINKED…CLICK MAP, THEN YOUR AREA)
WSI DOPPLER RADAR LOOP (LINKED)
RAP RADAR (CLICK IMAGE THEN GO TO LOOP DURATION AND PICK LENGTH OF LOOP, THEN CLICK RADAR SITE)
You may direct any questions by contacting me personally, ANYTIME, at: firstname.lastname@example.org
Have a blessed evening!
T. F. “STORM” WALSH III
GMCS, USCG (ret)
METEOROLOGIST / HURRICANE SPECIALIST /SEVERE WEATHER SPECIALIST
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