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Pittsburgh/ Western PA Part III


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Severe Thunderstorm Warning


SEVERE THUNDERSTORM WARNING

PAC003-005-051-063-125-129-112300-

/O.NEW.KPBZ.SV.W.0055.140611T2220Z-140611T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE PITTSBURGH PA

620 PM EDT WED JUN 11 2014

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

SOUTHEASTERN ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...

SOUTHERN ARMSTRONG COUNTY IN WEST CENTRAL PENNSYLVANIA...

SOUTHWESTERN INDIANA COUNTY IN WEST CENTRAL PENNSYLVANIA...

EASTERN WASHINGTON COUNTY IN SOUTHWEST PENNSYLVANIA...

NORTHWESTERN FAYETTE COUNTY IN SOUTHWEST PENNSYLVANIA...

WESTMORELAND COUNTY IN SOUTHWEST PENNSYLVANIA...

* UNTIL 700 PM EDT

* AT 618 PM EDT...SEVERE THUNDERSTORMS WERE ALONG A LINE EXTENDING

FROM ELIZABETH BORO TO PERRYOPOLIS...MOVING NORTHEAST AT 45 MPH.

AN ADDITIONAL SEVERE THUNDERSTORM WAS LOCATED NEAR WEST NEWTON.

HAZARD...60 MPH GUSTS.

SOURCE...RADAR.

IMPACT...TREE DAMAGE.

* LOCATIONS IMPACTED INCLUDE...

DONORA... PERRYOPOLIS... MONONGAHELA...

MONESSEN... BELLE VERNON... CHARLEROI...

ELIZABETH BORO... WEST NEWTON... MCKEESPORT...

WEST MIFFLIN... TURTLE CREEK... MONROEVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT WEDNESDAY EVENING

FOR WESTERN MARYLAND AND SOUTHWESTERN PENNSYLVANIA AND NORTHERN WEST

VIRGINIA.

THIS LINE OF STORMS ALSO IS PRODUCING TORRENTIAL RAIN. POOR DRAINAGE

AREAS MAY FLOOD QUICKLY.

PLEASE REPORT SEVERE WEATHER BY CALLING...412-262-1988...POSTING TO

THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER @NWSPITTSBURGH.

&&

LAT...LON 4068 7953 4044 7912 4001 7983 4026 8002

TIME...MOT...LOC 2220Z 228DEG 38KT 4029 7993 4011 7977

$$

KRAMAR/88

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Special Weather Statement


SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE PITTSBURGH PA

1259 PM EDT FRI JUN 13 2014

PAZ014-020>022-029-073-WVZ001-131800-

ALLEGHENY PA-ARMSTRONG PA-BEAVER PA-BUTLER PA-HANCOCK WV-

WASHINGTON PA-WESTMORELAND PA-

1259 PM EDT FRI JUN 13 2014

...STRONG THUNDERSTORMS WILL AFFECT THE AREA...

AT 1256 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR IN

PITTSBURGH SHOWED STRONG THUNDERSTORMS ALONG A LINE FROM ALIQUIPPA

TO COLLIERS...MOVING EAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THESE

STORMS. HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL SMALL

STREAMS.

LOCATIONS IMPACTED INCLUDE...

RACCOON CREEK STATE PARK... HARSHAVILLE...

BEAVER... ALIQUIPPA... FLORENCE...

ECONOMY BORO... BURGETTSTOWN... MOON...

CRANBERRY... SEWICKLEY... IMPERIAL...

WEXFORD...

PLEASE REPORT SIGNIFICANT WEATHER BY POSTING TO THE NWS PITTSBURGH

FACEBOOK PAGE OR BY USING TWITTER @NWSPITTSBURGH.

LAT...LON 4069 7960 4027 8002 4042 8058 4072 8029

$$

07

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Special Weather Statement


SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE PITTSBURGH PA

200 PM EDT FRI JUN 13 2014

PAZ014-021>023-029-073>076-131900-

ALLEGHENY PA-ARMSTRONG PA-BUTLER PA-FAYETTE PA-FAYETTE RIDGES PA-

INDIANA PA-WASHINGTON PA-WESTMORELAND PA-WESTMORELAND RIDGES PA-

200 PM EDT FRI JUN 13 2014

...STRONG THUNDERSTORMS WILL AFFECT THE AREA...

AT 157 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH

SHOWED STRONG THUNDERSTORMS ALONG A LINE FROM 3 MILES WEST OF

FREEPORT TO PLUM TO 4 MILES WEST OF MONONGAHELA...MOVING EAST AT 30

MPH.

WIND GUSTS TO 40 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THESE

STORMS. HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL SMALL

STREAMS.

LOCATIONS IMPACTED INCLUDE...

WILKINSBURG... SPRINGDALE... RUSSELLTON...

PENN HILLS... NEW KENSINGTON... FOX CHAPEL...

EAST LIBERTY... BRENTWOOD... BETHEL PARK...

BALDWIN... WEST MIFFLIN... NATRONA HEIGHTS...

PLEASE REPORT SIGNIFICANT WEATHER BY POSTING TO THE NWS PITTSBURGH

FACEBOOK PAGE OR BY USING TWITTER @NWSPITTSBURGH.

LAT...LON 4067 7900 4040 7907 4004 7935 4016 8017

4052 7990 4073 7984

$$

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mcd1014.gif

 

MESOSCALE DISCUSSION 1014
NWS STORM PREDICTION CENTER NORMAN OK
0101 PM CDT MON JUN 16 2014

AREAS AFFECTED...MUCH OF SOUTHERN/CENTRAL/EASTERN OH AND NORTHERN WV
TO WESTERN PA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 161801Z - 162000Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...LOCALLY DAMAGING WINDS WILL BE POSSIBLE ON AN ISOLATED
BASIS THIS AFTERNOON AS STORMS SPREAD GENERALLY EASTWARD ACROSS
SOUTHERN/CENTRAL/EASTERN PORTIONS OF OH AND NORTHERN WV INTO WESTERN
OH.

DISCUSSION...THUNDERSTORMS HAVE BEEN GRADUALLY INCREASING ACROSS
PORTIONS OF OH SINCE LATE MORNING IN ASSOCIATION WITH AN
INCREASINGLY WARM/WEAKLY INHIBITED BOUNDARY LAYER. IT IS POSSIBLE
THIS DEVELOPMENT MAY BE AIDED BY A WEAK IMPULSE/SUBTLE MCV VIA
UPSTREAM EARLY MORNING CONVECTION. REGARDLESS...A GENERAL PREVALENCE
OF 80S F SURFACE DEWPOINTS AND MIDDLE 60S F SURFACE DEWPOINTS IS
LEADING TO AS MUCH AS 1500 J/KG OF MLCAPE...BASED ON CONTEMPORARY
MODIFICATIONS TO THE 12Z OBSERVED SOUNDING FROM WILMINGTON OH ASIDE
FROM THE LATEST RAP SOUNDINGS. WHILE THE REGION IS WELL SOUTH OF THE
STRONGER WESTERLIES ALOFT...MODEST WESTERLY WINDS BETWEEN 3-6 KM AND
STEEPENING LOW-LEVEL LAPSE RATES/ADEQUATE CAPE MAY ALLOW FOR SOME
SUSTAINED EASTWARD-MOVING CLUSTERS CAPABLE OF DOWNBURSTS THIS
AFTERNOON. WHILE NOT SEVERE...SOMEWHAT STRONGER CALIBER WIND GUSTS
HAVE BEEN NOTED OVER THE PAST 1-2 HOURS FROM WRIGHT-PATERSON AFB /37
KT/ AND PARKERSBURG WV /40 KT/.

..GUYER/MEAD.. 06/16/2014

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Flash Flood Watch


FLOOD WATCH

NATIONAL WEATHER SERVICE PITTSBURGH PA

546 PM EDT WED JUN 18 2014

OHZ041-PAZ007>009-013>016-020>023-073-074-190545-

/O.NEW.KPBZ.FF.A.0004.140618T2200Z-140619T1400Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

COLUMBIANA-MERCER-VENANGO-FOREST-LAWRENCE-BUTLER-CLARION-

JEFFERSON PA-BEAVER-ALLEGHENY-ARMSTRONG-INDIANA-WESTMORELAND-

WESTMORELAND RIDGES-

INCLUDING THE CITIES OF...SALEM...GROVE CITY...FRANKLIN...

TIONESTA...NEW CASTLE...BUTLER...CLARION...BROOKVILLE...BEAVER...

PITTSBURGH METRO AREA...KITTANNING...INDIANA...GREENSBURG...

LATROBE...LIGONIER...DONEGAL

546 PM EDT WED JUN 18 2014

...FLASH FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING...

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* FLASH FLOOD WATCH FOR PORTIONS OF EAST CENTRAL OHIO AND

PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN EAST CENTRAL

OHIO...COLUMBIANA. IN PENNSYLVANIA...ALLEGHENY...ARMSTRONG...

BEAVER...BUTLER...CLARION...FOREST...INDIANA...JEFFERSON PA...

LAWRENCE...MERCER...VENANGO...WESTMORELAND AND WESTMORELAND

RIDGES.

* THROUGH THURSDAY MORNING

* 1.5 TO 2.5 INCHES OF RAIN ARE POSSIBLE AS SHOWERS AND

THUNDERSTORMS MOVE ACROSS THE AREA.

* 1 TO 2 INCHES OF RAIN FELL OVER THE WATCH AREA LAST NIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR FLASH

FLOODING.

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION

SHOULD FLASH FLOOD WARNINGS BE ISSUED.

&&

$$

15

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te: Click for Watch Status Reports.

   SEL5   URGENT - IMMEDIATE BROADCAST REQUESTED   SEVERE THUNDERSTORM WATCH NUMBER 325   NWS STORM PREDICTION CENTER NORMAN OK   455 PM EDT WED JUN 18 2014   THE NWS STORM PREDICTION CENTER HAS ISSUED A   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF      NORTHEAST OHIO     LAKE ERIE   * EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 455 PM     UNTIL 1100 PM EDT.   * PRIMARY THREATS INCLUDE...     ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE     ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 40   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST OF   CLEVELAND OHIO TO 20 MILES NORTH NORTHEAST OF YOUNGSTOWN OHIO.    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH   OUTLINE UPDATE (WOUS64 KWNS WOU5).   PRECAUTIONARY/PREPAREDNESS ACTIONS...   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 321...WW 322...WW   323...WW 324...   DISCUSSION...A BOWING MCS FROM NEAR DETROIT TO TOLEDO IS EXPECTED TO   CONTINUE EAST-SOUTHEAST ACROSS THE WATCH AREA THIS EVENING. DAMAGING   WINDS WILL BE THE PRIMARY HAZARD...THOUGH SOME HAIL IS ALSO   POSSIBLE.   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 28040.   ...MEAD
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oducts issued by NWS for: 2 Miles NW Mount Oliver PA


Severe Thunderstorm Warning
SEVERE THUNDERSTORM WARNINGPAC003-007-019-125-190215-/O.NEW.KPBZ.SV.W.0082.140619T0124Z-140619T0215Z/BULLETIN - EAS ACTIVATION REQUESTEDSEVERE THUNDERSTORM WARNINGNATIONAL WEATHER SERVICE PITTSBURGH PA924 PM EDT WED JUN 18 2014THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A* SEVERE THUNDERSTORM WARNING FOR...  ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...  BEAVER COUNTY IN WESTERN PENNSYLVANIA...  SOUTHERN BUTLER COUNTY IN WEST CENTRAL PENNSYLVANIA...  NORTHERN WASHINGTON COUNTY IN SOUTHWEST PENNSYLVANIA...* UNTIL 1015 PM EDT* AT 919 PM EDT...SEVERE THUNDERSTORMS WERE ALONG A LINE EXTENDING  FROM BEAVER FALLS TO FLORENCE...MOVING EAST AT 45 MPH.  HAZARD...60 MPH GUSTS.  SOURCE...RADAR.  IMPACT...TREE DAMAGE.* LOCATIONS IMPACTED INCLUDE...  BEAVER FALLS...       RACCOON CREEK STATE PARK...  HARSHAVILLE...        FLORENCE...           SHIPPINGPORT...  BURGETTSTOWN...       BEAVER...             FOMBELL...  ALIQUIPPA...          ECONOMY BORO...       MOON...  IMPERIAL...PRECAUTIONARY/PREPAREDNESS ACTIONS...THIS LINE OF STORMS ALSO IS PRODUCING TORRENTIAL RAIN. POOR DRAINAGEAREAS MAY FLOOD QUICKLY.PLEASE REPORT SEVERE WEATHER BY CALLING...412-262-1988...POSTING TOTHE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER @NWSPITTSBURGH.&&LAT...LON 4060 7975 4058 7977 4055 7976 4022 7986      4040 8049 4085 8036 4078 7970TIME...MOT...LOC 0124Z 281DEG 41KT 4080 8030 4045 8039$$
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BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
1002 PM EDT WED JUN 18 2014

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
NORTHEASTERN GREENE COUNTY IN SOUTHWEST PENNSYLVANIA...
SOUTHERN WASHINGTON COUNTY IN SOUTHWEST PENNSYLVANIA...
NORTHWESTERN FAYETTE COUNTY IN SOUTHWEST PENNSYLVANIA...
SOUTHWESTERN WESTMORELAND COUNTY IN SOUTHWEST PENNSYLVANIA...

* UNTIL 1100 PM EDT

* AT 1001 PM EDT...SEVERE THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM CANONSBURG TO 6 MILES SOUTHWEST OF CLAYSVILLE...MOVING
SOUTHEAST AT 35 MPH.

HAZARD...60 MPH GUSTS.

SOURCE...RADAR.

IMPACT...TREE DAMAGE.

* LOCATIONS IMPACTED INCLUDE...
CLAYSVILLE... CANONSBURG... ENTERPRISE...
WASHINGTON... SWARTS... MONONGAHELA...
BENTLEYVILLE... MARIANNA... WAYNESBURG...
MONESSEN... CHARLEROI... DONORA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT SEVERE WEATHER BY CALLING...412-262-1988...POSTING TO
THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER @NWSPITTSBURGH.

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Severe Thunderstorm Warning


SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE PITTSBURGH PA

1016 PM EDT WED JUN 18 2014

PAC003-005-063-129-190300-

/O.CON.KPBZ.SV.W.0085.000000T0000Z-140619T0300Z/

ALLEGHENY PA-ARMSTRONG PA-INDIANA PA-WESTMORELAND PA-

1016 PM EDT WED JUN 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT

FOR WESTMORELAND...INDIANA...ARMSTRONG AND ALLEGHENY COUNTIES...

AT 1014 PM EDT...THE FRONT EDGE OF A SEVERE THUNDERSTORM WAS

DETECTED NEAR APOLLO...MOVING EAST AT 45 MPH.

HAZARD...60 MPH GUSTS.

SOURCE...RADAR.

IMPACT...TREE DAMAGE.

* LOCATIONS IMPACTED INCLUDE...

VANDERGRIFT... APOLLO... LEECHBURG...

CROOKED CREEK LAKE PARK... FREEPORT...

NATRONA HEIGHTS... NEW KENSINGTON... PLUM...

SPRINGDALE... SALTSBURG... NEW ALEXANDRIA...

ELDERTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT SEVERE WEATHER BY CALLING...412-262-1988...POSTING TO

THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER @NWSPITTSBURGH.

LAT...LON 4050 7890 4030 7904 4049 7981 4067 7975

4067 7970 4070 7969 4072 7881

TIME...MOT...LOC 0216Z 275DEG 41KT 4059 7948

$$

15

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mcd1079.gif

 

MESOSCALE DISCUSSION 1079
NWS STORM PREDICTION CENTER NORMAN OK
1118 PM CDT WED JUN 18 2014

AREAS AFFECTED...PA...NRN WV...NRN MD...FAR NRN VA...DE

CONCERNING...SEVERE THUNDERSTORM WATCH 329...

VALID 190418Z - 190545Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 329
CONTINUES.

SUMMARY...THE WIND DAMAGE THREAT MAY CONTINUE THROUGH PART OF THE
OVERNIGHT PERIOD ACROSS SRN PA...NRN MD AND ERN WV. DUE TO THE
ISOLATED NATURE OF THE THREAT AND DECREASING INSTABILITY...WW
ISSUANCE IS NOT ANTICIPATED BEYOND THE 09Z WW EXPIRATION TIME.

DISCUSSION...THE LATEST WATER VAPOR IMAGERY SHOWS A WELL-DEFINED
SHORTWAVE TROUGH IN THE OH VALLEY. LARGE-SCALE ASCENT AHEAD OF THIS
FEATURE IS SUPPORTING A LINEAR MCS CURRENTLY LOCATED FROM CNTRL PA
EXTENDING SWWD INTO NRN WV. THIS LINE IS FORECAST TO CONTINUE TO
MOVE ACROSS THE CNTRL APPALACHIAN MTNS DURING THE OVERNIGHT PERIOD.
THE AIRMASS AHEAD OF THE LINE IS STILL MODERATELY UNSTABLE ACCORDING
TO OBJECTIVE ANALYSIS WITH MLCAPE ESTIMATED IN THE 1000 TO 2000 J/K
RANGE IN SRN PA AND NRN MD. THIS COMBINED UNIDIRECTIONAL FLOW
EVIDENT ON REGIONAL WSR-88D VWPS AND 50 KT OF 0-6 KM SHEAR...SHOULD
SUPPORT A WIND DAMAGE THREAT WITH SMALL BOWS EMBEDDED IN THE LINE.
HAIL MAY ALSO OCCUR WITH THE STRONGER UPDRAFTS. THE SEVERE THREAT
MAY TEND TO BECOME MORE ISOLATED WITH TIME AS THE INSTABILITY
DECREASES ACROSS THE REGION OVER THE NEXT FEW HOURS.

OTHER STORMS ARE CURRENTLY ONGOING IN AND TO THE SOUTHEAST OF WW 329
IN NRN MD TO NEAR THE DE STATE-LINE. THIS ACTIVITY MAY ALSO POSE A
SEVERE WEATHER RISK WITH WIND DAMAGE POTENTIAL. DUE TO THE LIMITED
SPATIAL THREAT AREA TO THE EAST OF WW 329...ADDITIONAL WW ISSUANCE
IS NOT ANTICIPATED.

..BROYLES/EDWARDS.. 06/19/2014

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mcd1243.gif

 

MESOSCALE DISCUSSION 1243
NWS STORM PREDICTION CENTER NORMAN OK
0222 PM CDT TUE JUL 01 2014

AREAS AFFECTED...NY...PA...AND ERN OH

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 011922Z - 012015Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...SCATTERED STRONG TO SEVERE STORMS WILL BE POSSIBLE THIS
AFTERNOON FROM PARTS OF NY AND PA INTO ERN OH. SEVERE TSTM WATCH
ISSUANCE REMAINS POSSIBLE...BUT OVERALL COVERAGE OF SEVERE WEATHER
IS UNCERTAIN RESULTING IN THE PROBABILITY FOR WATCH ISSUANCE BEING
40 PERCENT.

DISCUSSION...THE LIKELIHOOD FOR WATCH ISSUANCE IS GREATER WITH NWD
EXTENT INTO UPSTATE NY...GIVEN CLOSER PROXIMITY TO GREATER DEEP
LAYER SHEAR AND FORCING FOR ASCENT ATTENDANT TO THE SRN
EXTENT/GLANCING EFFECTS OF A TROUGH MOVING THROUGH SRN QUEBEC.

LIGHTNING DATA AND MOSAIC RADAR IMAGERY SHOWED TSTMS HAVE CONTINUED
TO DEVELOP ALONG A BOUNDARY MOVING EWD ACROSS NY...WITH MOST RECENT
ACTIVITY EXTENDING FROM THE ERN SHORE OF LAKE ONTARIO THROUGH
CENTRAL NY...NWRN PA...AND EAST CENTRAL OH. ADDITIONAL STORMS HAVE
DEVELOPED ALONG THE HIGHER TERRAIN IN CENTRAL PA. WATER VAPOR
IMAGERY SHOWED A SHORTWAVE TROUGH MOVING THROUGH SRN QUEBEC WITH THE
SRN EXTENT OF THIS MIDLEVEL FEATURE MOVING THROUGH NRN NY RESULTING
IN WEAK HEIGHT FALLS IN THE NRN EXTENT OF THE DISCUSSION AREA.
MOISTURE RETURN COMBINED WITH DIABATIC HEATING HAS RESULTED IN A
MODERATELY UNSTABLE ENVIRONMENT FROM THE OH VALLEY TO UPSTATE NY.
WHILE ADDITIONAL STORMS WILL BE POSSIBLE THROUGHOUT THE DISCUSSION
AREA...THE NRN PORTION ACROSS UPSTATE NY MAY HAVE THE GREATEST
POTENTIAL FOR WATCH ISSUANCE /HIGHER SEVERE WEATHER THREAT/...GIVEN
THE PROXIMITY TO STRONGER SWLY MIDLEVEL FLOW /30-40 KT/ ENHANCING
DEEP LAYER SHEAR FOR STORM ORGANIZATION.

..PETERS/CORFIDI.. 07/01/2014

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mcd1293.gif

 

MESOSCALE DISCUSSION 1293
NWS STORM PREDICTION CENTER NORMAN OK
1218 PM CDT MON JUL 07 2014

AREAS AFFECTED...W-CNTRL INTO E-CNTRL IND / W-CNTRL INTO E-CNTRL OH
/ WV PANHANDLE / WRN PA

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY

VALID 071718Z - 071845Z

PROBABILITY OF WATCH ISSUANCE...20 PERCENT

SUMMARY...SCATTERED TO NUMEROUS STORMS ARE FORECAST TO DEVELOP THIS
AFTERNOON IN VICINITY OF THE IND-OH-WRN PA I-70 CORRIDOR. STRONG TO
LOCALLY SEVERE MULTICELLS CAPABLE OF ISOLATED WIND DAMAGE AND
MARGINALLY SEVERE HAIL MAY ACCOMPANY THE STRONGER CORES.

DISCUSSION...17Z SATELLITE/SURFACE MESOANALYSIS PLACES A WEAKENING
FRONTAL ZONE OVER LOWER MI SWWD INTO W-CNTRL IL AND A PRE-FRONTAL
DIFFERENTIAL-HEATING ZONE GENERALLY INVOF THE I-70 CORRIDOR FROM
W-CNTRL IL EWD TO 30 MI S DNV TO 40 MI NW DAY AND INTO NWRN PORTIONS
OF PA. CONVECTION HAS PREFERENTIALLY DEVELOPED WITHIN THIS ZONE
THUS FAR AND EXPECTING ADDITIONAL STORMS TO GRADUALLY DEVELOP AND
INTENSIFY THROUGH MID-AFTERNOON AS CINH WEAKENS. A SHORTWAVE TROUGH
WILL CONTINUE TO PROGRESS EWD ACROSS THE LOWER GREAT LAKES AND INTO
THE NERN STATES THIS AFTERNOON AND PROVIDE A PARTIAL IMPETUS FOR
ADDITIONAL STORMS...WITH TRAILING AND LESSENING INFLUENCE FROM THIS
MID-LEVEL WAVE FARTHER SW OVER WRN OH AND IND. AS A RESULT...THE
POTENTIAL FOR ORGANIZED SEVERE MAY BE HIGHEST FROM ERN OH INTO PA.

BOUNDARY LAYER DEWPOINTS RANGING FROM THE MID 60S IN WRN PA TO NEAR
70 DEG F IN W-CNTRL IND ARE CONTRIBUTING TO MODERATE BUOYANCY
/1000-2500 J PER KG MLCAPE/ EARLY THIS AFTERNOON. SWLY SURFACE
WINDS VEERING TO WLY IN THE MID-LEVELS /30-40 KT/ ARE RESULTING IN
20-30 KT EFFECTIVE SHEAR AND YIELD STRONG TO SEVERE MULTICELLULAR
MODES.

..SMITH/EDWARDS.. 07/07/2014

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WATCH COUNTY NOTIFICATION FOR WATCH 397
NATIONAL WEATHER SERVICE PITTSBURGH PA
245 PM EDT MON JUL 7 2014

PAC003-005-007-019-031-053-063-065-073-085-121-125-129-080200-
/O.NEW.KPBZ.SV.A.0397.140707T1845Z-140708T0200Z/

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
397 IN EFFECT UNTIL 10 PM EDT THIS EVENING FOR THE FOLLOWING
AREAS

IN PENNSYLVANIA THIS WATCH INCLUDES 13 COUNTIES

IN NORTHWEST PENNSYLVANIA

FOREST MERCER VENANGO

IN SOUTHWEST PENNSYLVANIA

ALLEGHENY BEAVER WASHINGTON
WESTMORELAND

IN WEST CENTRAL PENNSYLVANIA

ARMSTRONG BUTLER CLARION
INDIANA JEFFERSON PA LAWRENCE

THIS INCLUDES THE CITIES OF...BEAVER...BROOKVILLE...BUTLER...
CLARION...FRANKLIN...GREENSBURG...GROVE CITY...INDIANA...
KITTANNING...LATROBE...NEW CASTLE...PITTSBURGH METRO AREA...
TIONESTA AND WASHINGTON.

$

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SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE PITTSBURGH PA

358 PM EDT MON JUL 7 2014

PAZ020-021-029-072045-

ALLEGHENY PA-BEAVER PA-WASHINGTON PA-

358 PM EDT MON JUL 7 2014

...A STRONG THUNDERSTORM WILL AFFECT EXTREME NORTH CENTRAL

WASHINGTON...NORTHERN ALLEGHENY AND SOUTHEASTERN BEAVER COUNTIES...

AT 351 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR HARSHAVILLE...

MOVING EAST AT 60 MPH.

WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS

STORM.

LOCATIONS IMPACTED INCLUDE...

IMPERIAL... MOON... ECONOMY BORO...

SEWICKLEY... FRANKLIN PARK... MCKEES ROCKS...

WEXFORD... PERRYSVILLE...

NORTH SIDE PITTSBURGH... MILLVALE...

GIBSONIA... ALLISON PARK...

PLEASE REPORT SIGNIFICANT WEATHER BY POSTING TO THE NWS PITTSBURGH

FACEBOOK PAGE OR BY USING TWITTER @NWSPITTSBURGH.

LAT...LON 4060 7973 4060 7975 4058 7977 4055 7977

4054 7972 4053 7970 4046 7970 4044 8040

4062 8042 4066 7969 4063 7969

$$

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