January 18, 2021

Weather News – Road Conditions – weather forecast

SEVERE WEATHER SYNOPSIS…ENHANCED RISK FOR PORTIONS OF VA. AND SC…ISSUED DEC. 23, 2020…8:35 P.M. EST

5 min read


Disclaimer:  This site 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, 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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Greetings to everyone!
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.).

Good evening,
Please bear in mind, the information provided by F5 DATA Severe Weather software could change between now, and the time of severe weather initiation, as the models cycle throughout the evening and early morning.  This may change timing and location somewhat, of areas that will be affected.

The Storm Prediction Center (SPC) has issued an ENHANCED RISK of severe thunderstorms ACROSS FAR NORTHEASTERN SOUTH CAROLINA…EASTERN NORTH CAROLINA…AND SOUTHEASTERN VIRGINIA…

…SPC SUMMARY…
Severe thunderstorms are expected across the Carolinas and Mid Atlantic region Thursday afternoon and evening. A few severe thunderstorms are also possible across portions of southeast Alabama, southwest Georgia, and Florida Thursday.

SPC DAY 2 CONVECTIVE OUTLOOK (LINKED TO SPC SITE…CLICK TO FIND UPDATED OUTLOOKS)

SPC DAY 2 TORNADO OUTLOOK

SPC DAY 2 DAMAGING WIND OUTLOOK
Based on my analysis of information contained in the SPC outlook text, and analysis of low level winds (925 – 850 mb) and mid level winds forecast (500 mb), mid level winds are forecast out of the SW – SSW at 100 to 100+ kts, and a low level jet developing, with winds forecast to around 80 to 90 kts.  The risk areas will be under influence of the right entrance region of a 500 and 200 mb jetstreak.  Although lapse rates from 700 – 500 mb will be weak (7.0 or lower), given this strong, veering flow, and strong low level warm advection spreading over the area, conditions appear to be favorable enough for mid and low level rotation.  This will lend credence to isolated supercell thunderstorms, and tornado activity.  The SPC suggests this occurs during late afternoon.  However, analysis this evening of the 18Z run of the NAM-WRF mesoscale model tends to indicate initiation of these conditions after 4:00 p.m. EST closer to the 6:00 p.m. – 7:00 p.m. time period.  Based on my analysis of the model output, analyzing various parameters and indices such as EHI (Energy Helicity Index), STP (Significant Tornado Parameter), 1km Helicity, 1km VGP (Vorticity Generation Parameter), and Stensrud Tornado Risk, the output of the NAM – WRF model from F5 DATA Severe Weather software suggests the highest probability for tornadoes to occur, lie within the outline of the following maps.  This fairly much concurs with the SPC SREF model percentage of STP values of >1 occurring within the time frame of the F5 maps:
NAM F5 DATA BEST SEVERE AND TORNADO PROBABILITY 7:00 P.M. EST

NAM F5 DATA BEST SEVERE AND TORNADO PROBABILITY 10:00 P.M. EST

SPC SREF STP>1 PROBABILITY 7:00 P.M. EST

SPC SREF STP>1 PROBABILITY 10:00 P.M. EST

As the front approaches the Eastern Seaboard, storms are forecast to become more of a QLCS (Quasi Linear Convective System) type setup.  Please refer to the SPC link below for the update on tomorrows DAY 1 Outlook:
https://www.spc.noaa.gov/products/outlook/
The following maps should update automatically, however they are also linked for you to click on and receive current watches and mesoscale discussions:
SPC MESOSCALE DISCUSSIONS

SPC WATCHES

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.
NWS WATCH / WARNING DISPLAY (LINKED)

WSI DOPPLER RADAR LOOP (LINKED)


You may direct any questions by contacting me personally, ANYTIME, at: twalsh22000@yahoo.com

Have a blessed evening!

T. F. “STORM” WALSH III
GMCS, USCG (ret)
METEOROLOGIST / HURRICANE SPECIALIST /SEVERE WEATHER SPECIALIST

 

About palmharborforecastcenter

I am a Tropical Forecast meteorologist, providing hurricane forecasts during the Atlantic Hurricane Season. I retired from the U.S. Coast Guard in July of 2001. Meteorology became my passion in high school, and I have continued my educational background in meteorology since 1996, when I undertook the study of Tropical Meteorology. While working toward my degree, I had to unexpectedly withdraw from college due to my oldest sons medical reasons. I do however, meet the educational criteria of the AMS to be recognized as a meteorologist. Studies include, but are not limited to the Navy Aerographers Mate course, Naval METOC meteorology course, Meteorology 2010 Sophomore level course while attending St. Petersburg College, Clearwater, FL., Basic Forecasting course for operational meteorologists from Rapid WX, meteorology institute, a four month meteorological internship, and extensive research on numerous meteorological topics such as the MJO, NAO, satellite imagery interpretation, etc.

I have been forecasting Tropical Weather (Tropical Storms and Hurricanes) since 1996, with my main client being three different Coast Guard Commands.



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