Originally posted by Gazrok
I've only been through a cat 2 (Elena) and that sat offshore. Not sure what to expect, but preparing for the worst...
Then you remember how the bay rose to cover Bayshore Blvd. That 's purely due to its winds swirling CCW and pushing water up. That will be nothing
if this one comes through the bay or just left of it. I plotted the 5AM coordinates and it looks to run right over Pinellas county. Not good for my
brother (Feather Sound), worse for the rest of my family who will be east of that path and in the way of the rising bay and Alafia river.
My sister said the news last night said that TECO is planning proactive shutdowns of their grid. Makes sense since most of Tampa proper will be
underwater tonight. No sense energizing the flooded streets with downed lines.
Here are some snaps from Accuweather Professional:
The arrows refer to storm vectors. Here is the storm table.
KEYW Storm Attributes Table
08/13/2004 13:42 - 32 STORMS DETECTED - TOP 20 Shown (SHOW MORE: 50 | 100 | ALL)
ID# AZM RNG DIR SPD TVS MESO PSH POH MXSZ VIL DBZ HGT TOP
T6 286 55 200 60 NONE UNCO 0 60 < 0.50 22 53 5.00 22.00
T7 209 18 195 43 NONE NONE 0 0 0.00 16 53 6.80 16.60
Y2 295 12 186 55 NONE NONE 0 0 0.00 11 52 8.00 12.90
I3 278 55 NEW NEW NONE 3DCO 0 20 < 0.50 7 51 15.90 27.20
D7 236 80 235 11 NONE NONE 0 0 0.00 14 51 8.50 17.20
A5 26 77 156 26 NONE NONE 0 0 0.00 14 51 7.90 16.20
T2 14 73 161 37 NONE NONE 0 0 0.00 13 51 7.30 14.80
Q5 227 56 233 45 NONE NONE 0 0 0.00 13 51 5.00 21.30
F3 307 16 186 53 NONE NONE 0 0 0.00 9 51 2.70 16.60
G4 322 38 165 46 NONE UNCO 0 0 0.00 8 50 2.70 11.10
D3 316 22 182 50 NONE NONE 0 0 0.00 12 50 5.80 14.70
V4 28 68 163 35 NONE NONE 0 0 0.00 11 50 6.60 13.70
Z0 30 77 148 48 NONE NONE 0 0 0.00 12 49 16.20 16.20
F5 342 84 142 52 NONE NONE 0 0 0.00 11 49 9.10 17.80
U1 227 65 237 36 NONE NONE 0 0 0.00 9 49 6.20 12.70
O0 6 79 153 32 NONE NONE 0 0 0.00 9 49 8.30 16.90
S4 263 25 209 43 NONE NONE 0 0 0.00 8 49 1.80 13.90
J1 283 54 NEW NEW NONE NONE 0 40 < 0.50 5 48 21.50 26.60
X9 218 89 237 24 NONE NONE 0 0 0.00 10 48 10.00 19.50
T1 340 91 152 42 NONE NONE 0 0 0.00 10 48 10.30 19.70
Some info on this table from Accuweather:
What Is The Storm Attributes Table With Storm Timer(tm)?
The NEXRAD Doppler radar Storm Attributes Table shows information about the severity of specifically identified storms. The information in the table
is generated solely by the NEXRAD radar. The NEXRAD radar also identifies and tracks individual thunderstorms. The StormTimer projects the movement of
the storm. If the NEXRAD data analysis process has found no storms, the message "No Storms Detected" will appear in place of the Storm Information
How Does The Storm Timer Tell Storm Movement?
The Storm Timer product predicts the movement of storms based on their current velocity (direction and speed). The arrow points in the current
direction with each square at a set time (0, 15, 30, 45 minutes ahead) and the arrowhead representing the storm's destination in 60 minutes.
What Do Each Of The Storm Table Columns Mean (TVS, MESO, etc.)?
The colums in the Storm Information Table are explained as follows.
ID# (Identification Number) - The storm ID identifies individual storms that have been designated as such by the NEXRAD radar. Each Radar site
assigns their own storm ID even though the same storm may be seen by two or more radars. The storm ID appears on the Storm Timer layer as a two letter
code. Although there may be more ID's in the Storm Information Table, only the first 8 are marked on the Storm Timer layer because of clutter
AZM (Azimuth) - The direction, in degrees from the radar site, in which the storm is located. Not to be confused with DIR (Direction) which is the
direction from which the storm is moving.
RNG (Range) - The distance from the radar site to the identified storm in miles.
TVS (Tornadic Vortex Signature) - TVS or ETVS (Elevated Tornadic Vortex Signature) is a signature of a potential tornado indicated by the NEXRAD
radar. NEXRAD will indicate "TVS" or "ETVS" if the rotational shear that has been calculated by the NEXRAD radar is judged strong enough that the
storm may produce a tornado or "NONE" meaning no tornado vortex signature is detected (there is either no rotation or the rotational shear is not of
sufficient strength to result in a tornado) as judged by the NEXRAD radar. The National Weather Service will issue tornado warnings based on the
strength of the TVS or ETVS signature.
MESO (Mesocyclone) - MESO (Mesocylone identified), UNCO (Uncorrelated Shear (2-D) identified), or 3DCO (3-D Correlated Shear identified) will be
present if the NEXRAD radar indicates rotation on a slightly larger scale then the TVS signature within a thunderstorm. Mesocyclones are the parent
rotation for tornado development. Seen at the surface, a mesocyclone is the wall cloud in the southwest part of a supercell thunderstorm. NEXRAD will
indicate "MESO", "3DCO" or "UNCO" if rotation has been detected or "NONE" if no rotation is detected.
PSH (Probability of Severe Hail) - This is the probability that the identified storm contains Hail that meets the National Weather Service's criteria
for a "Severe Thunderstorm", which is a diameter of 3/4" or larger.
POH (Probability of Hail) - Stands for the probability of hail within a thunderstorm based on measurements from the NEXRAD radar. The probability of
hail is used in conjunction with the probability of severe hail to provide information on the potential for hail damage.
MXSZ (Maximum Predicted Size Of Hail) - This is calcuated by the radar to provide a prediction of the maximum size of hail occurring in the identified
storm at the time of observations.
VIL (Vertically Integrated Liquid) - Vertically Integrated Liquid (VIL) shows the amount of liquid water contained in a vertical column over each
point on the display. The data is measured in kilograms per square meter, a measure of volume. The computer programs that create the Vertically
Integrated Liquid (VIL) product use as their input the reflectivity data gathered from all the elevation angles surveyed during the volume scan (as is
displayed in the four tilts of the Base Reflectivity product and the Composite Reflectivity product). The computer programs assume that all
reflectivities are from liquid water and then use equations to convert the reflectivities to liquid water content. Hail has unusually high
reflectivities (much higher than the largest raindrops) which can cause this product to overestimate the amount of liquid water actually contained in
the clouds. For this reason, very high VIL values in thunderstorms are a good indication that hail may be occurring. VIL data is useful in
distinguishing thunderstorms from rain showers. The thunderstorms will tend to have relatively higher VIL values, although the threshold VIL value for
the difference between a rain shower and a thunderstorm will differ from one location to another, due to differences in atmospheric conditions and
climate. Also, as thunderstorm development progresses, relative VIL values can help differentiate between strong thunderstorms that may be severe and
thunderstorms that are not likely to be severe. However, VIL data must be used in conjunction with the other NEXRAD products and weather data other
than radar data to determine the likelihood that a particular thunderstorm may produce severe weather. Furthermore, the relationship of VIL to the
occurrence of severe weather is different and needs to be defined separately for different atmospheric conditions and climate regimes. The correlation
that can be made using VIL data is that the precipitation areas with the highest VIL data levels are the strongest echoes within the radar's coverage
area. For a line of thunderstorms (a squall line) examination of the VIL values can help determine which storms in the squall line are the strongest
and have the highest potential for producing severe weather.
DBZ (Maximum dBZ Level) - This is defined as the maximum dBZ reading with in a storm as detected by NEXRAD radar. For more information on dBZ see
HGT (Maximum dBZ LevelHeight) - Height of the maximum dBZ or reflectivity, in thousands of feet. For example, 14.6 means the highest reflectivity
level detected in the storm is at an altitude of 14,600 feet.
TOP (Storm Top) - Indicates the height of the top of the storm in thousands of feet above the radar's antenna. The NEXRAD computer typically gives
the height of the top of the 30 dBz reflectivity which may not always correspond with the top of the storm's cloud. For example, an entry in the TOP
column of 14.8 indicates the top of the 30 dBz reflectivity in the storm is at an altitude of 14,800 feet above the radar.
DIR (Direction) - The direction (in degrees) FROM which the identified storm was determined (by the radar) to be moving. Subtract 180 degrees to get
the direction in which the storm is moving TO. Or, even better, just check the StormTimer, which shows arrows based on this direction information.
SPD (Speed) - The speed at which the identified storm was determined (by the radar) to be moving, in knots. This information is used to create the