Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 91
NWS STORM PREDICTION CENTER NORMAN OK
615 PM EDT WED APR 10 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN OHIO
WESTERN AND CENTRAL PENNSYLVANIA
THE NORTHERN WEST VIRGINIA PANHANDLE
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 615 PM
UNTIL 100 AM EDT.
HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH
SOUTHWEST OF AKRON OHIO TO 65 MILES EAST OF ALTOONA PENNSYLVANIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 88...WW 89...WW 90...
DISCUSSION...ERN OH/NW PA SQLN EXPECTED TO CONTINUE ESE AT 35-40
KTS...BOLSTERED BY STRONG WLY REAR INFLOW SAMPLED BY KCLE VWP.
MODERATE... UNIDIRECTIONAL WLY BACKGROUND FLOW ON NRN FRINGE OF SE
U.S. UPR HIGH AND RELATIVELY STEEP LOW TO MID-LVL LAPSE RATES
SUGGEST POTENTIAL FOR CONTINUED DEVELOPMENT OF FORWARD-PROPAGATING
LINE SEGMENTS/SMALL BOWS WITH DMGG WIND/MARGINALLY SVR HAIL THROUGH
MID-LATE EVE.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
VECTOR 28035.
...CORFIDI
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 91 SEVERE TSTM OH PA WV 102215Z - 110500Z
AXIS..40 STATUTE MILES NORTH AND SOUTH OF LINE..
40SSW CAK/AKRON OH/ - 65E AOO/ALTOONA PA/
..AVIATION COORDS.. 35NM N/S /42ENE APE - 4NW HAR/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28035.
LAT...LON 40958172 40867708 39707708 39818172
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 91 Status Report Messages:
STATUS REPORT #5 ON WW 91
VALID 110320Z - 110440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 WNW MRB
TO 25 E AOO TO 15 S UNV TO 25 N CXY.
FOR ADDITIONAL INFORMATION SEE SPC MESOSCALE DISCUSSION 437.
..EDWARDS..04/11/13
ATTN...WFO...PBZ...CTP...
&&
STATUS REPORT FOR WS 91
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
PAC001-009-041-055-057-067-087-099-133-110440-
PA
. PENNSYLVANIA COUNTIES INCLUDED ARE
ADAMS BEDFORD CUMBERLAND
FRANKLIN FULTON JUNIATA
MIFFLIN PERRY YORK
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #4 ON WW 91
VALID 110240Z - 110340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 SSE LBE
TO 25 W AOO TO 30 NW AOO TO 25 N CXY.
..EDWARDS..04/11/13
ATTN...WFO...PBZ...CTP...
&&
STATUS REPORT FOR WS 91
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
PAC001-009-013-021-041-055-057-061-067-087-099-111-133-110340-
PA
. PENNSYLVANIA COUNTIES INCLUDED ARE
ADAMS BEDFORD BLAIR
CAMBRIA CUMBERLAND FRANKLIN
FULTON HUNTINGDON JUNIATA
MIFFLIN PERRY SOMERSET
YORK
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 91
VALID 110120Z - 110240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE ZZV
TO 10 SSW HLG TO 10 W PIT TO 15 N PIT TO 35 SW DUJ TO 30 S DUJ TO
20 SSW UNV TO 25 N CXY.
FOR ADDITIONAL INFORMATION SEE SPC MESOSCALE DISCUSSION 433.
..EDWARDS..04/11/13
ATTN...WFO...PBZ...CTP...
&&
STATUS REPORT FOR WS 91
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
OHC013-110240-
OH
. OHIO COUNTIES INCLUDED ARE
BELMONT
$$
PAC001-003-005-009-013-021-041-051-055-057-059-061-063-067-087-
099-111-125-129-133-110240-
PA
. PENNSYLVANIA COUNTIES INCLUDED ARE
ADAMS ALLEGHENY ARMSTRONG
BEDFORD BLAIR CAMBRIA
CUMBERLAND FAYETTE FRANKLIN
FULTON GREENE HUNTINGDON
INDIANA JUNIATA MIFFLIN
PERRY SOMERSET WASHINGTON
WESTMORELAND YORK
$$
WVC009-051-069-110240-
WV
. WEST VIRGINIA COUNTIES INCLUDED ARE
BROOKE MARSHALL OHIO
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 91
VALID 110037Z - 110140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SE YNG TO
30 S DUJ TO 15 ESE UNV TO 25 SSW IPT.
FOR ADDITIONAL INFORMATION SEE SPC MESOSCALE DISCUSSION 433.
..EDWARDS..04/11/13
ATTN...WFO...PBZ...CTP...
&&
STATUS REPORT FOR WS 91
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
OHC013-019-029-031-059-067-081-119-157-110140-
OH
. OHIO COUNTIES INCLUDED ARE
BELMONT CARROLL COLUMBIANA
COSHOCTON GUERNSEY HARRISON
JEFFERSON MUSKINGUM TUSCARAWAS
$$
PAC001-003-005-007-009-013-019-021-041-051-055-057-059-061-063-
067-073-087-099-111-125-129-133-110140-
PA
. PENNSYLVANIA COUNTIES INCLUDED ARE
ADAMS ALLEGHENY ARMSTRONG
BEAVER BEDFORD BLAIR
BUTLER CAMBRIA CUMBERLAND
FAYETTE FRANKLIN FULTON
GREENE HUNTINGDON INDIANA
JUNIATA LAWRENCE MIFFLIN
PERRY SOMERSET WASHINGTON
WESTMORELAND YORK
$$
WVC009-029-051-069-110140-
WV
. WEST VIRGINIA COUNTIES INCLUDED ARE
BROOKE HANCOCK MARSHALL
OHIO
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 91
VALID 102340Z - 110040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA
EXCEPT FOR COUNTIES REMOVED FROM LIST BELOW..
..EDWARDS..04/10/13
ATTN...WFO...PBZ...CTP...
&&
STATUS REPORT FOR WS 91
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
OHC013-019-029-031-059-067-081-119-157-110040-
OH
. OHIO COUNTIES INCLUDED ARE
BELMONT CARROLL COLUMBIANA
COSHOCTON GUERNSEY HARRISON
JEFFERSON MUSKINGUM TUSCARAWAS
$$
PAC001-003-005-007-009-013-019-021-023-027-033-035-041-051-055-
057-059-061-063-067-073-087-099-111-125-129-133-110040-
PA
. PENNSYLVANIA COUNTIES INCLUDED ARE
ADAMS ALLEGHENY ARMSTRONG
BEAVER BEDFORD BLAIR
BUTLER CAMBRIA CAMERON
CENTRE CLEARFIELD CLINTON
CUMBERLAND FAYETTE FRANKLIN
FULTON GREENE HUNTINGDON
INDIANA JUNIATA LAWRENCE
MIFFLIN PERRY SOMERSET
WASHINGTON WESTMORELAND YORK
$$
WVC009-029-051-069-110040-
WV
. WEST VIRGINIA COUNTIES INCLUDED ARE
BROOKE HANCOCK MARSHALL
OHIO
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
High (70%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (10%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (>95%)
|
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.