Alert archive / Pennsylvania / Flash Flood Watches in 2011
Flash Flood Watch 6, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood watch at Aug 7, 2011, 1:55 AM EDT for Fayette County, Greene County, Pennsylvania; Marion County, West Virginia. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 7, 2011, 1:55 AM EDT (05:55 UTC)
- Expired
- Aug 7, 2011, 5:01 AM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Flood severity
- None
Counties Fayette County, PA, Greene County, PA, Marion County, WV
The radar
The Pittsburgh radar (KPBZ), 87 km from the middle of the area, began a volume at 05:57 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 00:00Z, 5.9 hours before the alert went out and 72 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.
- Mixed-layer CAPE
- 1195 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 863 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before this flash flood watch went out at Aug 6, 11:18 PM EDT, 2 hours 37 minutes earlier.
Area forecast discussion, Aug 6, 11:18 PM EDT, 2 hours 37 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1118 PM EDT SAT AUG 6 2011 .SYNOPSIS... A LOW PRESSURE SYSTEM WILL BRING SHOWERS AND SCATTERED THUNDERSTORMS OVERNIGHT. A WARM AND HUMID AIR MASS WILL ALLOW FOR THE CHANCE OF SHOWERS AND THUNDERSTORMS INTO EARLY NEXT WEEK. COOLER AND MORE SEASONABLE AIR CAN BE EXPECTED FOR THE MIDDLE OF NEXT WEEK. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... BASED ON RECENT RADAR DATA, EXPECT A LINE OF SCATTERED THUNDERSTORMS WITH HEAVY RAIN AND FREQUENT LIGHTNING TO CONTINUE MOVING EASTWARD AT 20 MPH PAST THE OHIO LINE INTO WESTERN PENNSYLVANIA AND NORTHERN WEST VIRGINIA. THE STORMS CAN WEAKEN BY 1 AM. SO ADDED MENTION OF A SHORT PERIOD OF HEAVY RAIN AND FREQUENT LIGHTNING TO THE GRID/ZONE FORECAST AND A SPECIAL WEATHER STATEMENT. WIND GUSTS TO 30 MPH ARE ALSO POSSIBLE. AFTER 1 AM, EXPECT COVERAGE OF SHOWERS AND THUNDERSTORMS TO DECREASE TO ISOLATED BY DAWN. WILL FURTHER CONSIDERATION TO COVERAGE OF FOG BY MORNING, PARTLY BASED ON HOW MUCH RAIN FALLS BY 1 AM. WITH RECENT DEW POINT TRENDS AND LAMP GUIDANCE AS SUPPORT, OVERNIGHT LOWS HAVE BEEN ADJUSTED UP A FEW DEGREES, IN THE LOWER 70S ACROSS MOST OF THE AREA. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY/... APPEARS THAT THE DOWNSCALED NAM NAMDG55 HAS BEST DEPICTION OF THE POPS FIELDS IN THIS TIME RANGE. CHANCE POPS FOR SUNDAY. SFC DEW POINTS REMAIN IN THE 70S SUNDAY THEN DROP INTO THE UPPER 60S MONDAY AND TUESDAY...WITH MINIMAL/SLIGHT CHANCE POPS. HIGHS SUNDAY A COUPLE DEGREES WARMER VS TODAY AS LESS CLOUDS LEADING T0 MORE HEATING. RIDGE STARTING TO FLATTEN OUT SO HIGHS DROPPING A FEW DEGREES BY TUESDAY. && .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/... A SHORTWAVE WILL EXIT THE AREA TUESDAY NIGHT WITH SHOWERS DECREASING. MEDIUM RANGE MODELS CONTINUE TO DEPICT ZONAL FLOW TO LOW AMPLITUDE RIDGING ALOFT FOR WEDNESDAY THROUGH THE END OF THE WEEK. ANY RIPPLES IN THE FLOW WILL BE WEAK AND DIFFICULT TO TIME...THUS WILL KEEP POPS LOW THROUGH FRIDAY. ECMWF/GFS ARE IN SOME AGREEMENT WITH A LITTLE STRONGER SYSTEM BY THE WEEKEND...THUS WILL INCLUDE CHANCE POPS SATURDAY. NEAR TO SLIGHTLY BELOW NORMAL TEMPERATURES WILL PREVAIL. && .AVIATION /03Z SUNDAY THROUGH THURSDAY/... EXPECT LINE OF SCATTERED THUNDERSTORMS WITH HEAVY RAIN MAY CAUSE BRIEF IFR CONDITIONS AS THEY PASS THROUGH THE I-79 CORRIDOR. WITH AMPLE LOW LEVEL MOISTURE, WIDESPREAD FOG AND STRATUS WILL CAUSE DETERIORATION TO IFR RESTRICTIONS BY DAWN. THE LOW CLOUDS/FOG WILL GRADUALLY LIFT BY SUNDAY MIDDAY...WITH SCT/BKN VFR MID DECK LATER SUNDAY AFTN. OUTLOOK /SUNDAY NIGHT THROUGH THURSDAY/... SCATTERED SHOWERS AND TSTMS COULD BRING AREAS OF RESTRICTIONS THROUGH EARLY IN THE WEEK. AS THE FLOW BECOMES MORE ZONAL...EXPECT CHANCES OF PRECIP TO DECREASE FOR WEDNESDAY/THURSDAY. AREAS OF OVERNIGHT/EARLY MORNING FOG AND RESTRICTIONS ARE POSSIBLE WITH CONTINUED MOIST LOW LEVEL CONDITIONS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
Hazardous weather outlook, Aug 6, 5:23 AM EDT, 20 hours 32 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 523 AM EDT SAT AUG 6 2011 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021>023-041-070930- GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON- JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO- FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY- ARMSTRONG-INDIANA-WASHINGTON-GREENE-WESTMORELAND-WESTMORELAND RIDGES- FAYETTE-FAYETTE RIDGES-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION- MONONGALIA-PRESTON-TUCKER- 523 AM EDT SAT AUG 6 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Special weather statement, Aug 6, 9:19 PM EDT, 4 hours 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 919 PM EDT SAT AUG 6 2011 OHZ039-048-049-057-058-070215- COSHOCTON OH-GUERNSEY OH-HARRISON OH-MUSKINGUM OH-TUSCARAWAS OH- 919 PM EDT SAT AUG 6 2011 ...A STRONG THUNDERSTORM WILL AFFECT EXTREME SOUTHWESTERN HARRISON... NORTHEASTERN MUSKINGUM...NORTHERN GUERNSEY...SOUTHEASTERN COSHOCTON AND SOUTHERN TUSCARAWAS COUNTIES... AT 910 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 2 MILES SOUTH OF COSHOCTON...MOVING EAST AT 10 MPH. WIND GUSTS TO 40 MPH AND HAIL UP TO DIME SIZE ARE POSSIBLE WITH THIS STORM. SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE... COSHOCTON... CONESVILLE... WEST LAFAYETTE... PLAINFIELD... BODEN... NEWCOMERSTOWN... SALT FORK STATE PARK... KIMBOLTON... GILMORE... BIRMINGHAM... PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY. LAT...LON 4030 8129 4003 8136 4017 8194 4034 8189
Special weather statement, Aug 6, 10:48 PM EDT, 3 hours 7 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1048 PM EDT SAT AUG 6 2011
OHZ039-040-048>050-058-059-068-069-WVZ003-004-012-070330-
BELMONT OH-CARROLL OH-COSHOCTON OH-GUERNSEY OH-HARRISON OH-
JEFFERSON OH-MARSHALL WV-MONROE OH-NOBLE OH-OHIO WV-TUSCARAWAS OH-
WETZEL WV-
1048 PM EDT SAT AUG 6 2011
...STRONG THUNDERSTORMS WITH HEAVY RAIN AND FREQUENT LIGHTNING WILL
AFFECT BELMONT...EASTERN MONROE...EXTREME NORTHEASTERN
NOBLE...HARRISON...NORTHEASTERN COSHOCTON...NORTHEASTERN
GUERNSEY...NORTHWESTERN WETZEL...SOUTH CENTRAL JEFFERSON...
SOUTHWESTERN CARROLL...TUSCARAWAS...WESTERN MARSHALL AND WESTERN
OHIO COUNTIES...
AT 1042 PM EDT...STRONG THUNDERSTORMS WITH HEAVY RAIN AND FREQUENT
LIGHTNING WERE ALONG A LINE FROM 11 MILES WEST OF WOOSTER TO 4 MILES
NORTHWEST OF LONDONDERRY TO 5 MILES EAST OF FLY...MOVING EAST AT 20
MPH.
WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THESE STORMS. THERE CAN ALSO
BE A SHORT PERIOD OF HEAVY RAIN THAT MAY CAUSE WATER TO POND ON
ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. THERE CAN
ALSO BE FREQUENT LIGHTNING FROM THESE STORMS. DO NOT STAY IN
THE OPEN NOR SEEK SHELTER UNDER TREES WHEN LIGHTNING
THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES.
SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
WOODSFIELD... SOMERTON... LONDONDERRY...
BIRMINGHAM... BENWOOD... BALTIC...
BAKERSVILLE... ANTIOCH... BARNESVILLE...
GILMORE... ROUND BOTTOM... STONE CREEK...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 4045 8168 4064 8166 4066 8148 4067 8146
4066 8143 4066 8124 4043 8103 4019 8070
3974 8066 3955 8081 3959 8086 3958 8090
3960 8095 3956 8100 4013 8141 4045 8184Special weather statement, Aug 7, 1:00 AM EDT, 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
100 AM EDT SUN AUG 7 2011
MDZ001-PAZ031-075-076-WVZ021>023-041-070600-
FAYETTE PA-FAYETTE RIDGES PA-GARRETT MD-GREENE PA-MARION WV-
MONONGALIA WV-PRESTON WV-TUCKER WV-
100 AM EDT SUN AUG 7 2011
...STRONG THUNDERSTORMS WITH HEAVY RAIN WILL AFFECT EASTERN
MARION...EXTREME NORTHWESTERN GARRETT...EXTREME NORTHWESTERN
TUCKER...MONONGALIA...PRESTON...SOUTHERN FAYETTE AND SOUTHERN GREENE
COUNTIES...
AT 1257 AM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 4 MILES
SOUTH OF WAYNESBURG TO EVERETTVILLE TO 5 MILES SOUTHWEST OF VALLEY
FALLS...MOVING EAST AT 15 MPH.
HEAVY RAIN WILL FALL AND CAN CAUSE WATER TO POND ON ROADS AND
QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. DO NOT DRIVE YOUR
VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER
DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO
HIGHER GROUND.
ALSO EXPECT FREQUENT LIGHTNING. DO NOT STAY IN THE OPEN NOR SEEK
SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS.
WIND GUSTS TO 30 MPH ARE POSSIBLE WITH THESE STORMS.
SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
WANA... WADESTOWN... RIVESVILLE...
MONONGAH... MCCURDYVILLE... FAIRMONT...
EVERETTVILLE... DAYBROOK... COLFAX...
BLACKSVILLE... BENTONS FERRY... BARRACKVILLE...
PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772...WHEN YOU CAN DO SO SAFELY.
LAT...LON 3924 7986 3929 7987 3930 7990 3943 7990
3945 7993 3938 8007 3940 8010 3939 8020
3941 8024 3957 8018 3973 8043 3991 8033
3989 7944 3956 7949 3924 7952The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 1:00 AM EDT | Special Weather Statement | PBZ | Greene | 60 min |
| Aug 7, 3:08 AM EDT | Flash Flood Warning | PBZ | Indiana | 3 hr |
| Aug 6, 9:19 PM EDT | Special Weather Statement | PBZ | Guernsey | 56 min |
| Aug 6, 9:49 PM EDT | Areal Flood Advisory | PBZ | Coshocton | 3 hr |
| Aug 6, 10:48 PM EDT | Special Weather Statement | PBZ | Belmont, Harrison, Monroe, Tuscarawas | 42 min |
| Aug 7, 5:59 PM EDT | Special Weather Statement | PBZ | Muskingum | 46 min |
| Aug 7, 6:24 PM EDT | Special Weather Statement | PBZ | Monroe, Noble | 66 min |
| Aug 7, 1:38 AM EDT | Flash Flood Warning | PBZ | Marion, Monongalia | 4 hr |
| Aug 7, 2:49 AM EDT | Flash Flood Warning | PBZ | Preston | 4 hr |
| Aug 7, 3:22 AM EDT | Flash Flood Warning | PBZ | Monongalia | 3 hr |
| Aug 7, 7:32 PM EDT | Special Weather Statement | PBZ | Wetzel | 28 min |
Nearby
Flash Flood Watches in Pennsylvania, 2011Flash Flood Watches in West Virginia, 2011Every flash flood watch in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.