Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 251
NWS STORM PREDICTION CENTER NORMAN OK
740 AM EDT THU APR 28 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MUCH OF MARYLAND
A SMALL PART OF NORTHWEST AND NORTHEAST NORTH CAROLINA
MUCH OF CENTRAL AND EASTERN VIRGINIA
COASTAL WATERS
EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 740 AM UNTIL
300 PM EDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHEAST OF
BALTIMORE MARYLAND TO 35 MILES EAST OF DANVILLE VIRGINIA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 247. WATCH NUMBER 247 WILL NOT BE IN EFFECT AFTER
740 AM EDT. CONTINUE...WW 249...WW 250...
DISCUSSION...A BROKEN BAND OF CONVECTION CONTINUES TO DEVELOP E OF
THE BLUE RIDGE AND THE SYNOPTIC COLD FRONT. A BREAK IN THE
CONVECTION IN NC IS ALLOWING AN UNIMPEDED INFLUX OF LOW-LEVEL
MOISTURE INTO VA...AND VERTICAL SHEAR PROFILES REMAIN STRONG. GIVEN
THE STRONG SHEAR AND MOIST PROFILES WITH WEAK INSTABILITY...THE
POTENTIAL FOR A FEW TORNADOES AND DAMAGING WINDS WITH
SUPERCELLS/BOWS WILL CONTINUE THROUGH AT LEAST MIDDAY OR EARLY
AFTERNOON.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22045.
...THOMPSON
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 251 TORNADO DC MD NC VA CW 281140Z - 281900Z
AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
35NNE BWI/BALTIMORE MD/ - 35E DAN/DANVILLE VA/
..AVIATION COORDS.. 70NM E/W /27ENE EMI - 42N RDU/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 22045.
REPLACES WW 247..DC MD NC TN VA WV CW
LAT...LON 39637491 36567726 36568013 39637791
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 251 Status Report Messages:
STATUS REPORT #4 ON WW 251
VALID 281835Z - 281900Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 W DAN TO
35 NW RIC TO 35 NNE BWI.
WW 251 WILL BE ALLOWED TO EXPIRE AT 281900Z.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 665
..GARNER..04/28/11
ATTN...WFO...LWX...AKQ...RNK...
&&
STATUS REPORT FOR WT 251
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC003-009-017-019-033-037-039-045-047-281900-
MD
. MARYLAND COUNTIES INCLUDED ARE
ANNE ARUNDEL CALVERT CHARLES
DORCHESTER PRINCE GEORGES ST. MARYS
SOMERSET WICOMICO WORCESTER
$$
NCC015-029-041-053-073-091-131-143-281900-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
BERTIE CAMDEN CHOWAN
CURRITUCK GATES HERTFORD
NORTHAMPTON PERQUIMANS
$$
VAC001-025-036-041-053-057-073-081-087-093-095-097-099-101-103-
115-119-127-131-133-149-159-175-181-183-193-199-550-570-595-620-
650-670-700-730-735-740-760-800-810-830-281900-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK BRUNSWICK CHARLES CITY
CHESTERFIELD DINWIDDIE ESSEX
GLOUCESTER GREENSVILLE HENRICO
ISLE OF WIGHT JAMES CITY KING AND QUEEN
KING GEORGE KING WILLIAM LANCASTER
MATHEWS MIDDLESEX NEW KENT
NORTHAMPTON NORTHUMBERLAND PRINCE GEORGE
RICHMOND SOUTHAMPTON SURRY
SUSSEX WESTMORELAND YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE COLONIAL HEIGHTS EMPORIA
FRANKLIN HAMPTON HOPEWELL
NEWPORT NEWS PETERSBURG POQUOSON
PORTSMOUTH RICHMOND SUFFOLK
VIRGINIA BEACH WILLIAMSBURG
$$
AMZ130-ANZ532-533-534-537-538-539-540-541-542-543-630-631-632-633-
634-650-652-654-656-658-281900-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ALBEMARLE SOUND
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
CHESTER RIVER TO QUEENSTOWN MD
EASTERN BAY
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA
CHESAPEAKE BAY FROM NEW POINT COMFORT TO LITTLE CREEK VA
CURRITUCK SOUND
CHESAPEKE BAY FROM LITTLE CREEK VA TO CAPE HENRY VA INCLUDING THE
CHESAPEKE BAY BRIDGE TUNNEL
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20
NM
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM
COASTAL WATERS FROM CAPE CHARLES LIGHT TO VIRGINIA-NORTH CAROLINA
BORDER OUT TO 20 NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 251
VALID 281745Z - 281840Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 W DAN TO
35 NW RIC TO 35 NNE BWI.
..GARNER..04/28/11
ATTN...WFO...LWX...AKQ...RNK...
&&
STATUS REPORT FOR WT 251
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC003-009-017-019-033-037-039-045-047-281840-
MD
. MARYLAND COUNTIES INCLUDED ARE
ANNE ARUNDEL CALVERT CHARLES
DORCHESTER PRINCE GEORGES ST. MARYS
SOMERSET WICOMICO WORCESTER
$$
NCC015-029-041-053-073-091-131-143-281840-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
BERTIE CAMDEN CHOWAN
CURRITUCK GATES HERTFORD
NORTHAMPTON PERQUIMANS
$$
VAC001-025-036-041-053-057-073-081-087-093-095-097-099-101-103-
115-119-127-131-133-149-159-175-181-183-193-199-550-570-595-620-
650-670-700-730-735-740-760-800-810-830-281840-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK BRUNSWICK CHARLES CITY
CHESTERFIELD DINWIDDIE ESSEX
GLOUCESTER GREENSVILLE HENRICO
ISLE OF WIGHT JAMES CITY KING AND QUEEN
KING GEORGE KING WILLIAM LANCASTER
MATHEWS MIDDLESEX NEW KENT
NORTHAMPTON NORTHUMBERLAND PRINCE GEORGE
RICHMOND SOUTHAMPTON SURRY
SUSSEX WESTMORELAND YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE COLONIAL HEIGHTS EMPORIA
FRANKLIN HAMPTON HOPEWELL
NEWPORT NEWS PETERSBURG POQUOSON
PORTSMOUTH RICHMOND SUFFOLK
VIRGINIA BEACH WILLIAMSBURG
$$
AMZ130-ANZ532-533-534-537-538-539-540-541-542-543-630-631-632-633-
634-650-652-654-656-658-281840-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ALBEMARLE SOUND
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
CHESTER RIVER TO QUEENSTOWN MD
EASTERN BAY
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA
CHESAPEAKE BAY FROM NEW POINT COMFORT TO LITTLE CREEK VA
CURRITUCK SOUND
CHESAPEKE BAY FROM LITTLE CREEK VA TO CAPE HENRY VA INCLUDING THE
CHESAPEKE BAY BRIDGE TUNNEL
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20
NM
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM
COASTAL WATERS FROM CAPE CHARLES LIGHT TO VIRGINIA-NORTH CAROLINA
BORDER OUT TO 20 NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 251
VALID 281635Z - 281740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NW LYH TO
10 ESE CHO TO 35 NNW BWI.
..GARNER..04/28/11
ATTN...WFO...LWX...AKQ...RNK...
&&
STATUS REPORT FOR WT 251
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC003-009-017-019-033-037-039-045-047-281740-
MD
. MARYLAND COUNTIES INCLUDED ARE
ANNE ARUNDEL CALVERT CHARLES
DORCHESTER PRINCE GEORGES ST. MARYS
SOMERSET WICOMICO WORCESTER
$$
NCC015-029-033-041-053-073-091-131-143-157-281740-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
BERTIE CAMDEN CASWELL
CHOWAN CURRITUCK GATES
HERTFORD NORTHAMPTON PERQUIMANS
ROCKINGHAM
$$
VAC001-007-011-025-029-031-033-036-037-041-049-053-057-073-075-
081-083-085-087-089-093-095-097-099-101-103-111-115-117-119-127-
131-133-135-143-145-147-149-159-175-181-183-193-199-550-570-590-
595-620-650-670-680-700-730-735-740-760-800-810-830-281740-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK AMELIA APPOMATTOX
BRUNSWICK BUCKINGHAM CAMPBELL
CAROLINE CHARLES CITY CHARLOTTE
CHESTERFIELD CUMBERLAND DINWIDDIE
ESSEX GLOUCESTER GOOCHLAND
GREENSVILLE HALIFAX HANOVER
HENRICO HENRY ISLE OF WIGHT
JAMES CITY KING AND QUEEN KING GEORGE
KING WILLIAM LANCASTER LUNENBURG
MATHEWS MECKLENBURG MIDDLESEX
NEW KENT NORTHAMPTON NORTHUMBERLAND
NOTTOWAY PITTSYLVANIA POWHATAN
PRINCE EDWARD PRINCE GEORGE RICHMOND
SOUTHAMPTON SURRY SUSSEX
WESTMORELAND YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE COLONIAL HEIGHTS DANVILLE
EMPORIA FRANKLIN HAMPTON
HOPEWELL LYNCHBURG NEWPORT NEWS
PETERSBURG POQUOSON PORTSMOUTH
RICHMOND SUFFOLK VIRGINIA BEACH
WILLIAMSBURG
$$
AMZ130-ANZ532-533-534-537-538-539-540-541-542-543-630-631-632-633-
634-650-652-654-656-658-281740-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
ALBEMARLE SOUND
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
CHESTER RIVER TO QUEENSTOWN MD
EASTERN BAY
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA
CHESAPEAKE BAY FROM NEW POINT COMFORT TO LITTLE CREEK VA
CURRITUCK SOUND
CHESAPEKE BAY FROM LITTLE CREEK VA TO CAPE HENRY VA INCLUDING THE
CHESAPEKE BAY BRIDGE TUNNEL
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20
NM
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM
COASTAL WATERS FROM CAPE CHARLES LIGHT TO VIRGINIA-NORTH CAROLINA
BORDER OUT TO 20 NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 251
VALID 281230Z - 281340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..DIAL..04/28/11
ATTN...WFO...LWX...AKQ...RNK...
&&
STATUS REPORT FOR WT 251
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DCC001-281340-
DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
DISTRICT OF COLUMBIA
$$
MDC003-005-009-013-017-019-021-025-027-031-033-037-510-281340-
MD
. MARYLAND COUNTIES INCLUDED ARE
ANNE ARUNDEL BALTIMORE CALVERT
CARROLL CHARLES DORCHESTER
FREDERICK HARFORD HOWARD
MONTGOMERY PRINCE GEORGES ST. MARYS
MARYLAND INDEPENDENT CITIES INCLUDED ARE
BALTIMORE CITY
$$
NCC033-131-157-169-171-193-197-281340-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
CASWELL NORTHAMPTON ROCKINGHAM
STOKES SURRY WILKES
YADKIN
$$
VAC003-007-009-011-013-019-025-029-031-033-036-037-041-047-049-
053-057-059-061-065-067-073-075-079-081-083-085-087-089-095-097-
099-101-103-107-109-111-113-115-117-119-125-127-133-135-137-141-
143-145-147-149-153-157-159-175-177-179-181-183-193-199-510-515-
540-570-590-595-600-610-620-630-670-680-683-685-690-730-760-830-
281340-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ALBEMARLE AMELIA AMHERST
APPOMATTOX ARLINGTON BEDFORD
BRUNSWICK BUCKINGHAM CAMPBELL
CAROLINE CHARLES CITY CHARLOTTE
CHESTERFIELD CULPEPER CUMBERLAND
DINWIDDIE ESSEX FAIRFAX
FAUQUIER FLUVANNA FRANKLIN
GLOUCESTER GOOCHLAND GREENE
GREENSVILLE HALIFAX HANOVER
HENRICO HENRY JAMES CITY
KING AND QUEEN KING GEORGE KING WILLIAM
LANCASTER LOUDOUN LOUISA
LUNENBURG MADISON MATHEWS
MECKLENBURG MIDDLESEX NELSON
NEW KENT NORTHUMBERLAND NOTTOWAY
ORANGE PATRICK PITTSYLVANIA
POWHATAN PRINCE EDWARD PRINCE GEORGE
PRINCE WILLIAM RAPPAHANNOCK RICHMOND
SOUTHAMPTON SPOTSYLVANIA STAFFORD
SURRY SUSSEX WESTMORELAND
YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
ALEXANDRIA BEDFORD CHARLOTTESVILLE
COLONIAL HEIGHTS DANVILLE EMPORIA
FAIRFAX FALLS CHURCH FRANKLIN
FREDERICKSBURG HOPEWELL LYNCHBURG
MANASSAS MANASSAS PARK MARTINSVILLE
PETERSBURG RICHMOND WILLIAMSBURG
$$
ANZ530-531-532-533-534-535-536-537-538-539-540-541-542-543-
281340-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHESAPEAKE BAY NORTH OF POOLES ISLAND MD
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
CHESTER RIVER TO QUEENSTOWN MD
EASTERN BAY
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (40%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Low (10%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (<5%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.