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Pittsburgh/ Western PA Part III


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Special Weather Statement


SPECIAL WEATHER STATEMENT

NATIONAL WEATHER SERVICE PITTSBURGH PA

412 PM EDT SUN JUL 27 2014

OHZ050-PAZ020-021-029-WVZ001>003-272115-

ALLEGHENY PA-BEAVER PA-BROOKE WV-HANCOCK WV-JEFFERSON OH-OHIO WV-

WASHINGTON PA-

412 PM EDT SUN JUL 27 2014

...A STRONG THUNDERSTORM WILL AFFECT BROOKE...EAST CENTRAL

JEFFERSON...NORTHEASTERN OHIO...NORTHERN WASHINGTON...SOUTHEASTERN

HANCOCK...SOUTHERN BEAVER AND WESTERN ALLEGHENY COUNTIES...

AT 409 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR AVELLA...

MOVING EAST AT 20 MPH.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM. HEAVY RAIN WILL

POND WATER ON ROADS AND QUICKLY FILL SMALL STREAMS.

LOCATIONS IMPACTED INCLUDE...

WELLSBURG... WEIRTON... SUN VALLEY...

FRANKLIN... FOLLANSBEE... COLLIERS...

BETHANY... TORONTO... STEUBENVILLE...

MINGO JUNCTION... BRILLIANT... AVELLA...

PLEASE REPORT SIGNIFICANT WEATHER BY POSTING TO THE NWS PITTSBURGH

FACEBOOK PAGE OR BY USING TWITTER @NWSPITTSBURGH.

LAT...LON 4064 8008 4029 7987 4011 8055 4044 8074

$$

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Looks like we'll be breaking the low high (min max) for the day, it stands at 72 from 1875, but looking at today's obs 69 will most likely be the high temperature. Tomorrow's record low of 52 and low high (min max) of 69 look to be within reach as well.

Kinda unique summer so far.

Very warm and humid at times, but the cool downs have been stronger than usual.

Will have to check the records, but the number of lows in the 50's here in July, is more than I can recently remember.

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Looks like we'll be breaking the low high (min max) for the day, it stands at 72 from 1875, but looking at today's obs 69 will most likely be the high temperature.  Tomorrow's record low of 52 and low high (min max) of 69 look to be within reach as well.   

 

We have a tie...

 

RECORD EVENT REPORT

NATIONAL WEATHER SERVICE PITTSBURGH PA

0631 PM EDT MON JUL 28 2014

...RECORD COLD HIGH TEMPERATURE TIED AT PITTSBURGH PA...

A RECORD COLD HIGH TEMPERATURE OF 72 DEGREES WAS TIED AT PITTSBURGH

PA TODAY. THE RECORD WAS SET IN 1875.

$

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Kinda unique summer so far.

Very warm and humid at times, but the cool downs have been stronger than usual.

Will have to check the records, but the number of lows in the 50's here in July, is more than I can recently remember.

I guess I forgot last July was also cool to end the month.

Really funny wearing sweatpants and a hoodie, at the end of July.

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000

SXUS71 KPBZ 291032

RERPIT

RECORD EVENT REPORT

NATIONAL WEATHER SERVICE PITTSBURGH PA

0631 AM EDT TUE JUL 29 2014

...RECORD LOW TEMPERATURE SET AT PITTSBURGH PA...

A RECORD LOW TEMPERATURE OF 51 DEGREES WAS SET AT PITTSBURGH PA TODAY.

THIS BREAKS THE OLD RECORD OF 52 SET IN 1982.

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pretty chilly day

000SXUS71 KPBZ 292335RERPITRECORD EVENT REPORTNATIONAL WEATHER SERVICE PITTSBURGH PA0730 PM EDT TUE JUL 29 2014...A RECORD COLD DAY IN PITTSBURGH...A RECORD LOW FOR JULY 29 OF 51 WAS SET. THE RECORD WAS 52 FROM 1982.A RECORD COLD HIGH TEMPERATURE OF 69 WAS TIED. THE RECORD WAS SET IN1981.A RECORD COLD MEAN TEMPERATURE OF 60 WAS ALSO SET. THE RECORD WAS 62FROM 1981.TEMPERATURE RECORDS FOR PITTSBURGH DATE BACK TO 1871.
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5FPvkda.gif

 SPC AC 111742   DAY 2 CONVECTIVE OUTLOOK CORR 1   NWS STORM PREDICTION CENTER NORMAN OK   1242 PM CDT MON AUG 11 2014   VALID 121200Z - 131200Z   ...THERE IS A SLGT RISK OF SVR TSTMS TUE AFTN AND EVE ACROSS PARTS   OF THE UPPER OHIO VALLEY AND NORTHERN MID ATLANTIC COAST REGION...   ...THERE IS A SLGT RISK OF SVR TSTMS TUE AFT AND EVE ACROSS PARTS OF   THE NORTHERN INTERMOUNTAIN REGION...   CORRECTED FOR TYPOS   ...SUMMARY...   SCATTERED STRONG TO SEVERE STORMS ARE EXPECTED TUESDAY AFTERNOON   INTO TUESDAY NIGHT ACROSS PARTS OF THE UPPER OHIO VALLEY INTO   NORTHERN MID ATLANTIC COAST REGION.  CLUSTERS OF STRONG TO SEVERE   STORMS ALSO APPEAR POSSIBLE ACROSS PARTS OF NORTHEASTERN   OREGON...CENTRAL AND EASTERN WASHINGTON...AND ADJACENT NORTHERN   IDAHO.   ...SYNOPSIS...   FURTHER AMPLIFICATION OF LARGE-SCALE UPPER TROUGHING ACROSS THE   EASTERN U.S. APPEARS LIKELY DURING THIS FORECAST PERIOD.  AT THE   SAME TIME...SOME WEAKENING OF UPSTREAM RIDGING MAY COMMENCE...AS THE   REMNANTS OF A CLOSED LOW ACCELERATE INLAND ACROSS THE NORTHERN   CALIFORNIA COAST THROUGH THE NORTHERN INTERMOUNTAIN REGION.  THIS IS   EXPECTED TO OCCUR IN RESPONSE TO THE APPROACH OF A DIGGING UPSTREAM   SHORT WAVE IMPULSE...WHICH IS FORECAST TO CONTRIBUTE TO THE   EVOLUTION OF A MORE PROMINENT CLOSED LOW AS IT APPROACHES THE   NORTHERN PACIFIC COAST.   AHEAD OF THIS LATTER FEATURE...AND AROUND THE WESTERN PERIPHERY OF   THE UPPER RIDGING...THUNDERSTORM PROBABILITIES WILL INCREASE FURTHER   ACROSS MUCH OF THE INTERMOUNTAIN REGION INTO THE PACIFIC NORTHWEST.    EAST OF THE ROCKIES...THUNDERSTORM POTENTIAL WILL REMAIN RELATIVELY   LOW ACROSS MUCH OF THE NORTHERN AND CENTRAL PLAINS INTO THE UPPER   MIDWEST...WHILE DRYING ASSOCIATED WITH THE EASTERN UPPER TROUGHING   ALSO CONTRIBUTES TO DIMINISHING CONVECTIVE POTENTIAL ACROSS THE   SOUTHERN PLAINS EAST NORTHEASTWARD TOWARD THE TENNESSEE VALLEY.  THE   RISK FOR THUNDERSTORM ACTIVITY WILL REMAIN RELATIVELY   HIGH...HOWEVER...ACROSS MUCH OF THE SOUTHERN AND MIDDLE ATLANTIC   SEABOARD...AND THE CENTRAL APPALACHIANS NORTHWARD INTO THE LOWER   GREAT LAKES REGION.   ...UPPER OHIO VALLEY INTO NORTHERN MID ATLANTIC COAST REGION...   PRE-COLD FRONTAL BOUNDARY LAYER DEW POINTS APPEAR LIKELY TO REMAIN   HIGH ENOUGH TO SUPPORT MODEST BOUNDARY LAYER DESTABILIZATION WITH AT   LEAST SOME INSOLATION ACROSS THE UPPER OHIO VALLEY AND ADJACENT   LOWER GREAT LAKES REGION BY TUESDAY AFTERNOON.  THIS WILL BE AIDED   BY MID-LEVEL COOLING ASSOCIATED WITH THE FAIRLY VIGOROUS SHORT WAVE   IMPULSE FORECAST TO TURN EASTWARD ACROSS THE OHIO VALLEY...TOWARD   THE MID ATLANTIC COAST REGION.  WITH MIXED LAYER CAPE EXPECTED TO   APPROACH OR EXCEED 1500 J/KG IN THE PRESENCE OF MODESTLY STRONG   CYCLONIC MID/UPPER FLOW...THE ENVIRONMENT PROBABLY WILL BECOME   CONDUCIVE TO THE DEVELOPMENT OF SCATTERED BANDS OR SMALL CLUSTERS OF   STORMS CAPABLE OF PRODUCING POTENTIALLY DAMAGING WIND GUSTS AND   PERHAPS MARGINALLY SEVERE HAIL.   ACTIVITY IS EXPECTED TO SPREAD EASTWARD ACROSS PARTS OF THE UPPER   OHIO VALLEY AND APPALACHIANS THROUGH THE LATE AFTERNOON AND EVENING   HOURS...WITH ADDITIONAL STORM DEVELOPMENT BECOMING FOCUSED ALONG A   WARM FRONTAL ZONE ACROSS PARTS OF THE DELMARVA PENINSULA/NORTHERN   MID ATLANTIC COAST REGION.  ALTHOUGH THE STRONGER SOUTHERLY 850 MB   FLOW FIELDS ARE EXPECTED MOSTLY NORTH OF THIS FRONT...ABOVE THE   COOLER AND MORE STABLE BOUNDARY LAYER AIR...IT DOES NOT APPEAR OUT   OF THE QUESTION THAT LOW-LEVEL HODOGRAPHS NEAR THE FRONT MAY BE   SUPPORTIVE OF SUPERCELLS CAPABLE OF PRODUCING DAMAGING WIND GUSTS OR   AN ISOLATED TORNADO OR TWO.  THIS POTENTIAL MAY BE HIGHEST LATE   TUESDAY NIGHT...WITH THE APPROACH OF THE UPPER TROUGH.   ...NORTHERN INTERMOUNTAIN REGION...   MOST MODEL GUIDANCE DOES SUGGEST THAT AN AREA OF ENHANCED MID-LEVEL   FORCING FOR ASCENT WILL OVERSPREAD PORTIONS OF NORTHEASTERN OREGON   AND CENTRAL/EASTERN WASHINGTON DURING THE PEAK LATE AFTERNOON   HEATING.  DESPITE LINGERING UNCERTAINTIES CONCERNING THE DEGREE OF   CAPE...EVEN GIVEN THE PRESENCE OF SEASONABLY HIGH MOISTURE   CONTENT...THIS FORCING SEEMS LIKELY TO BE SUFFICIENT TO SUPPORT ONE   OR TWO SUBSTANTIVE STORM CLUSTERS.  GIVEN THIS DEVELOPMENT...BASED   ABOVE A FAIRLY HOT AND DEEPLY MIXED BOUNDARY LAYER...THE RISK FOR   SEVERE WIND GUSTS APPEARS TO EXIST...PERHAPS AIDED BY THE DOWNWARD   TRANSPORT OF MOMENTUM ASSOCIATED WITH A 30+ KT LOWER/MID   TROPOSPHERIC SPEED MAXIMUM.   ..KERR.. 08/11/2014   CLICK TO GET WUUS02 PTSDY2 PRODUCT   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0600Z   CURRENT UTC TIME: 0205Z (10:05PM), RELOAD THIS PAGE TO UPDATE THE TIME
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mcd1548.gif

 

MESOSCALE DISCUSSION 1548
NWS STORM PREDICTION CENTER NORMAN OK
1126 AM CDT TUE AUG 12 2014

AREAS AFFECTED...ERN OH...WV...WRN PA AND FAR WRN NY

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 121626Z - 121830Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...STORMS ARE EXPECTED TO GRADUALLY INCREASE IN COVERAGE AND
INTENSITY WITH A THREAT OF LOCALIZED SEVERE WIND GUSTS AND/OR
MARGINAL HAIL.

DISCUSSION...A BROKEN LINE OF STORMS IS SLOWLY INCREASING ACROSS OH
ALONG THE COLD FRONT AND LEADING EDGE OF SOME COOLING ALOFT. THESE
STORMS WILL CONTINUE TO BE AIDED BY HEATING WITH SOME BREAKING OF
THE CLOUDS SPREADING EWD INTO WRN PA AND WV. INCREASING DEEP-LAYER
SHEAR WILL FAVOR FORWARD PROPAGATING STORMS AND HELP TO AND MAXIMIZE
LONGEVITY. INCREASING 700 MB FLOW TO AROUND 30 KT AND AMPLE MOISTURE
SHOULD HELP A FEW STORMS PRODUCE SEVERE WINDS...WITH MODEST MIDLEVEL
LAPSE RATES SUPPORTING MARGINALLY SEVERE HAIL.

A FEW CELLS MAY ACQUIRE BRIEF ROTATION AT TIMES...BUT OVERALL THE
BEST LOW-LEVEL SHEAR LOOKS TO BE DISPLACED TOO FAR E FROM THE
INSTABILITY AXIS.

..JEWELL/THOMPSON.. 08/12/2014

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Bu3U0tKCMAAsxgU.png

 

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
418 PM EDT TUE AUG 12 2014

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL ALLEGHENY COUNTY IN SOUTHWEST PENNSYLVANIA...
NORTHWESTERN WESTMORELAND COUNTY IN SOUTHWEST PENNSYLVANIA...

* UNTIL 500 PM EDT

* AT 412 PM EDT...SEVERE THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM FOX CHAPEL TO DOWNTOWN PITTSBURGH TO BALDWIN...MOVING EAST
AT 30 MPH.

HAZARD...60 TO 70 MPH GUSTS.

SOURCE...RADAR.

IMPACT...TREE DAMAGE.

* LOCATIONS IMPACTED INCLUDE...
FOX CHAPEL... EAST LIBERTY... BRENTWOOD...
BALDWIN... OAKLAND... ETNA...
SOUTH SIDE PITTSBURGH... MILLVALE...
DOWNTOWN PITTSBURGH... MOUNT WASHINGTON...
NORTH SIDE PITTSBURGH... BETHEL PARK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF STORMS IS NOT PRODUCING MUCH LIGHTNING. PREPARE FOR
DAMAGING WIND GUSTS. MOVE INTO A STURDY BUILDING AND AVOID WINDOWS.

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

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  • 2 weeks later...

mcd0340.gif

 

MESOSCALE PRECIPITATION DISCUSSION 0340
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
137 PM EDT TUE SEP 02 2014

AREAS AFFECTED...PORTIONS OF THE OH VALLEY

CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE

VALID 021736Z - 022336Z

SUMMARY...AN OUTFLOW BOUNDARY IS EXPECTED TO BE THE FOCUS FOR
RENEWED THUNDERSTORM ACTIVITY OVER THE NEXT SEVERAL HOURS.
RAINFALL RATES UP TO 2" COULD CAUSE FLASH FLOODING.

DISCUSSION...AN OUTFLOW BOUNDARY FROM OVERNIGHT THUNDERSTORM
ACTIVITY UPSTREAM ACROSS THE OHIO VALLEY HAS BEGUN TO LIE
DOWN/STALL ACROSS EASTERN KY, WITH SOME SCATTERED THUNDERSTORMS
STILL EXISTING IN ITS VICINITY ACROSS WV. OTHER THUNDERSTORMS ARE
MOVING TOWARDS THE WESTERN EDGE OF THIS REGION FROM SOUTHERN IN.
PRECIPITABLE WATER VALUES OF ~1.75" ARE EXPECTED ACROSS THE REGION
THIS AFTERNOON AND EVENING, WHILE 850-700 HPA INFLOW REMAINS CLOSE
TO 30 KTS, SIMILAR TO THE MAGNITUDE OF THE 850-400 HPA MEAN
LAYERED WIND. REGIONAL SOUNDINGS SHOW SATURATED LOW-LEVELS AND
REVEAL UNIDIRECTIONAL FLOW WITH HEIGHT WITHIN THE TROPOSPHERE.
MIXED LAYER CAPES ARE IN THE 1000-2000 J/KG RANGE, AND SHOULD
BUILD FURTHER BEFORE CONVECTION BREAKS OUT ACROSS THE REGION. THE
THRESHOLD FOR THE WET MULTICELL ENVIRONMENT HAS BEEN REACHED.

THE 06Z SSEO NEIGHBORHOOD PROBABILITIES OF EXCEEDING THREE HOURLY
FLASH FLOOD GUIDANCE VALUES ARE >50% ACROSS PORTIONS OF EASTERN
KY, WV, AND SOUTHWEST PA AND THAT THE THREAT FOR HEAVY RAINFALL
COULD PERSIST AS LATE AS 02Z. THE MOST RECENT MESOSCALE GUIDANCE
SHOWS LOCAL 2" AMOUNTS POSSIBLE IN THIS REGION. RECENT THOUGHTS
FROM SPC INDICATE THAT WV STANDS A GOOD CHANCE OF SEEING REPEAT
CONVECTION THIS AFTERNOON AND EVENING. WITH THE MOISTURE PRESENT,
HOURLY RAINFALL RATES UP TO 2" ARE POSSIBLE. CONVECTION IS
EXPECTED TO BE ON THE MOVE, BUT RANDOM CONVECTIVE CELLS/LINE
SEGMENTS COULD TRAIN GIVEN THE UNIDIRECTIONAL FLOW PRESENT. FLASH
FLOODING IS POSSIBLE, PARTICULARLY IN AREAS SATURATED BY RECENT
RAINS.

ROTH

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mcd1662.gif

 

MESOSCALE DISCUSSION 1662
NWS STORM PREDICTION CENTER NORMAN OK
0125 PM CDT TUE SEP 02 2014

AREAS AFFECTED...PORTIONS OF WRN AND CENTRAL PA/NY

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 021825Z - 022030Z

PROBABILITY OF WATCH ISSUANCE...40 PERCENT

SUMMARY...THUNDERSTORMS WILL INCREASE THROUGH THE AFTERNOON AHEAD OF
A COLD FRONT. BROKEN LINES OF STORMS WILL TRACK EWD ACROSS NY/PA
INTO THE EVENING HOURS AND MAY PRODUCE SPORADIC STRONG/LOCALLY
DAMAGING WIND GUSTS.

DISCUSSION...SHOWERS AND THUNDERSTORMS WERE INCREASING AHEAD OF THE
EWD ADVANCING SFC COLD FRONT FROM THE LAKES ERIE AND ONTARIO
VICINITY SWD INTO NW PA/ERN OHIO. AS TEMPERATURES WARM THROUGH THE
80S ACROSS NY/PA AHEAD OF THIS FEATURE...MODEST DESTABILIZATION WILL
CONTINUE WITH MLCAPE VALUES CURRENTLY AROUND 500-1000 J/KG. DEEP
LAYER EFFECTIVE SHEAR WILL BE QUITE STRONG ACROSS THE
REGION...UPWARDS OF 40 KT...AND WILL ALLOW FOR FAST MOVING LINE
SEGMENTS. WHILE POOR LAPSE RATES AND MODEST INSTABILITY WILL LIMIT
VIGOROUS UPDRAFTS...FAST STORM MOTION AND PW VALUES AOA 1.5 INCHES
MAY ALLOW FOR SPORADIC STRONG/DAMAGING WIND GUSTS...ESPECIALLY WHERE
GREATER HEATING OCCURS IN BROKEN CLOUDINESS. TRENDS WILL BE
MONITORED FOR POTENTIAL WATCH ISSUANCE LATER THIS AFTERNOON.

..LEITMAN/HART.. 09/02/2014

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  • 3 weeks later...

Had some graupel or small hail, with these showers.

I was down in NC on Topsail Island for vacation last week, great week of temps in the 78-83 range for swimming and soaking up some sun in the sand. We were driving home on I-70 around 7PM or so Saturday (4th) and I could of sworn I heard some pings on the windshield and thought to myself, no way that was graupel... or could it have been?! What a rude awakening it was too, we left Saturday morning with temps in the mid 70s and about half way home the temperature dropped from 78 to 55 in about an hour of driving. Next stop we had to put on sweatshirts and run the heater in the car lol.

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I was down in NC on Topsail Island for vacation last week, great week of temps in the 78-83 range for swimming and soaking up some sun in the sand. We were driving home on I-70 around 7PM or so Saturday (4th) and I could of sworn I heard some pings on the windshield and thought to myself, no way that was graupel... or could it have been?! What a rude awakening it was too, we left Saturday morning with temps in the mid 70s and about half way home the temperature dropped from 78 to 55 in about an hour of driving. Next stop we had to put on sweatshirts and run the heater in the car lol.

Here at home early about 1pm in one of the heavier showers, there was definetly frozen precip mixing in. (even a few very wet snowflakes).

Actually KPIT confirmed the frozen precip also.

 

Yeah, I was standing outside, and that cold wind had a different feel to it, from our chilly morning lows so far. lol

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  • 2 weeks later...

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