Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 49, NWS Pittsburgh, PA

July 29, 1986Fayette County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 29, 1986, 2:30 AM EDT for Fayette County, Westmoreland County, Pennsylvania. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 29, 1986, 2:30 AM EDT (06:30 UTC)
Expired
Jul 29, 1986, 3:30 AM EDT
In force
60 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Fayette County, PA, Westmoreland County, PA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jul 29, 3:00 AM EDTThunderstorm Wind 0Fayette, PA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 6.5 hours before the alert went out and 226 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 1986-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 1986-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
37 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
2218 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPIT 290631
SVRPIT
PAC051-129-290730-

BULLETIN  BROADCAST IMMEDIATELY
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
230 AM EDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A SEVERE
THUNDERSTORM WARNING UNTIL 330 AM THIS MORNING FOR THESE COUNTIES IN

SOUTHWESTERN PENNSYLVANIA...FAYETTE AND WESTMORELAND.

AT 230 AM THIS MORNING WEATHER RADAR SHOWED A SEVERE THUNDERSTORM
NEAR CHARLEROI. THIS STORM IS MOVING EAST AT 10 MPH AND WILL MOVE
ALONG THE BORDER BETWEEN FAYETTE AND WESTMORELAND COUNTIES. THIS
STORM WILL HAVE DAMAGING HIGH WINDS AND DANGEROUS LIGHTNING PLUS
LARGE HAIL AND POSSIBLY RAIN HEAVY ENOUGH TO CAUSE FLOODING.
A SEVERE THUNDERSTORM WARNING MEANS SEVE4RE THUNDERSTORMS ARE IMMINENT
OR IN PROGRESS. THESE STORMS WILL PRODUCE DAMAGING WIND..HAIL..HEAVY
RAIN..AND DANGEROUS LIGHTNING.

IF THREATENING WEATHER APPROACHES..GO TO A SAFE PLACE IMMEDIATELY.

END/COMEAUX/GIORDANO

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 28, 10:20 PM EDT, 4 hours 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
1020 PM EDT TUE JUL 28 1986

STRONG THUNDERSTORMS WILL BE MOVING ACROSS WESTERN PENNSYLVANIA
OVERNIGHT. SOME COULD HAVE WIND GUSTS STRONG ENOUGH TO CAUSE DAMAGE
OR ENOUGH RAIN TO CAUSE FLOODING.

MOST BUILDINGS OFFER ADEQUATE PROTECTION FROM LIGHTNING AND
THUNDERSTORM WIND GUSTS. MOBILE HOMES THAT ARE NOT ANCHORED ARE NOT.
CAMPERS...IF A BAD THUNDERSTORM IS APPROACHING..YOU WOULD BE WISE TO
SEEK SHELTER INDOORS. FALLING TREES ARE NO MATCH FOR A TENT.

RAINFALL EXCEEDING 3 INCHES OVERNIGHT COULD CAUSE FLOODING. IF YOU
LIVE IN A FLOOD PRONE AREA..BE ON THE LOOKOUT FOR REPEATED HEAVY
RAIN OR WATER LEVELS RAPIDLY RISING. NEVER GO THROUGH FLOODING TO
GET HIGHER GROUND. THE WATER MAY BE DEEPER THAN YOU THINK AND THE
FAST CURRENT COULD SWEEP YOU AWAY.

THE THUNDERSTORMS WILL BE MOVING THROUGH NORTHWESTERN PENNSYLVANIA
UNTIL SHORTLY AFTER MIDNIGHT. THEN THE STRONG STORMS WILL YMOVE THROUGH
SOUTHWESTERN PENNSYLVANIA AND THE CENTRAL PENNSYLVANIA MOUNTAINS
IN THE HOURS BETWEEN MIDNIGHT AND DAWN.

THE NATIONAL WEATHER SERVICE IS CLOSELY MONITORING THESE STORMS.
TUNE IN FOR LATER ADVISORIES.

GIORDANO
Special weather statement, Jul 28, 11:47 PM EDT, 2 hours 43 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
1150 PM EDT MON JUL 28 1986

AT 1145 PM RADAR SHOWED A SEVERE THUNDERSTORM JUST EAST OF
EAST LIVERPOOL OHIO..ENTERING BEAVER COUNTY PENNSYLVANIA.
FREQUENT..DANGEROUS LIGHTNING HAS BEEN REPORTED WITH THIS STORM.
THE STORM WILL MOVE INTO ALLEGHENY COUNTY BETWEEN MIDNIGHT AND 130AM.

OTHER STRONG THUNDERSTORMS WERE LOCATED IN TRUMBULL AND MAHONING
COUNTIES IN OHIO..AND IN MERCER..LAWRENCE..BUTLER COUNTIES IN
PENNSYLVANIA.

THE THUNDERSTORMS ARE MOVING SOUTHEAST AT 15 MPH.

SHOWERS WERE LOCATED IN SOUTHEASTERN OHIO FROM COLUMBUS TO ZANESVILLE.
Special weather statement, Jul 29, 12:04 AM EDT, 2 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
12 MIDNIGHT EDT TUE JUL 29 1986

A SEVERE LIGHTNING STORM WILL BE MOVING THROUGH BEAVER COUNTY AND
ALLEGHENY COUNTY BETWEEN NOW AND 2 AM. INDOORS IS THE SAFEST PLACE
FOR LIGHTNING. WHEN INDOORS HOWEVER..STAY OFF THE PHONE. UNPLUG
LARGE APPLIANCES. AND GET YOUR FLASHLIGHTS AND CANDLES READY.

THE LIGHTNING FROM THIS STORM DESTOYED A BARN IN SALEM OHIO AND CAUSED
NUMEROUS POWER OUTAGES AND TELEPHONE OUTAGES IN EAST LIVERPOOL OHIO.
HEAVY LIGHTNING HAS ALSO BEEN REPORTED IN BEAVER COUNTY.

ALSO BE ON THE LOOK OUT FOR STRONG WIND..LARGE HAIL..AND RAIN HEAVY
ENOUGH TO CAUSE FLOODING. IF YOU ARE IN FLOOD PRONE AREA..BE WATCHFUL
FOR PROLONGED HEAVY RAIN AND SUDDENLY RISING WATER LEVELS.

THIS STORM WILL BE MOVING THROUGH THE WEST HILLS OF PITTSBURGH BETWEEN
MIDNIGHT AND 1 AM. BASED ON ITS PRESENT MOVEMENT TOWARD THE SOUTHEAST
AT 10 MILES AN HOUR..IT COULD BE GOING THROUGH THE DOWNTOWN PITTSBURGH
AREA BETWEEN 1 AM AND 2 AM.
.
USING BATTERY OPERATED RADIO AND TV...KEEP TUNED FOR LATER ADVISORIE.

GIORDANO/VISNESKI
Local storm report, Jul 29, 12:28 AM EDT, 2 hours 2 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH, PA
1230 AM EDT TUE JUL 29 1986

AT 1205AM EDT IN BEAVER COUNTY PENNSYLVANIA...POWER LINES WERE BLOWN
DOWN IN PLEASANTS TOWNSHIP AND MIDLAND PENNSYLVANIA.
Special weather statement, Jul 29, 1:57 AM EDT, 33 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE PITTSBURGH, PA
157 AM EDT TUE JUL 29 1986

THUNDERSTORMS WERE LIGHTING UP THE SKIES OVER WESTERN PENNSYLVANIA
..EASTERN OHIO..AND THE PAHANDLE OF NORTHERN WEST VIRGINIA.

AT 130 AM EDT...NATIONAL WEATHER SERVICE RADAR IN PITTSBURGH WAS
SHOWING SCATTERED STRONG THUNDERSTORMS ALONG THE PENNSYLVANIA AND
OHIO STATE LINE. THE THUNDERSTROMS EXTENDED FROM LAKE ERIE SOUTH ALONG
THE STATE LINES INTO THE PANHANDLE OF NORTHERN WEST VIRGINIA.

PERSONS IN THESE AREAS SHOULD BE ON THE LOOK-OUT FOR DANGEROUS
LIGHTNING. LIGHTNING HAS ALREADY CAUSED NUMEROUS POWER OUTAGES
THROUGH-OUT EASTERN OHIO..WESTERN PENNSYLVANIA AND THE WEST VIRGINIA
PANHANDLE.

THESE STORMS ARE MOVING TO THE EAST AT 15 MILES AN HOUR. BECAUSE OF THE
SOME WHAT SLOW SPEED FLOODING OF LOW LYING AREAS AND SMALL STREAMS AND
CREEKS IS POSSIBLE.
HAIL THE SIZE OF NICKLES AND WINDS OVER 50 MILES AN HOUR HAVE BEEN
RECO&RDED WITH SOME OF THESE STORMS.

STAY TUNED TO COMMERICAL RADIO AND TV..OR WEATHER RADIO FOR LATER
WEATHER BULLITINS AND BE READY TO TAKE ACTION IF THREATING WEATHER
APPROACHES YOUR AREA.

TAYLOR/WELLS

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 28, 11:05 PM EDTSevere Thunderstorm WarningPBZBeaver70 min
Jul 29, 1:00 AM EDTSevere Thunderstorm WarningPBZGreene2 hr
Jul 29, 1:00 AM EDTSevere Thunderstorm WarningPBZGreene60 min
Jul 29, 1:00 AM EDTSevere Thunderstorm WarningPBZAllegheny60 min
Jul 29, 2:00 AM EDTSevere Thunderstorm WarningPBZAllegheny, Washington, Westmoreland60 min
Jul 29, 2:00 AM EDTSevere Thunderstorm WarningPBZGreene60 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1986Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.