Alert archive / Pennsylvania / Flash Flood Watches in 2018

Flash Flood Watch 7, NWS Pittsburgh, PA

July 5, 201814 counties in Pennsylvania; 11 counties in Ohio; 9 counties in West Virginia

NWS Pittsburgh, PA issued this flash flood watch at Jul 5, 2018, 4:10 AM EDT for 14 counties in Pennsylvania; 11 counties in Ohio; 9 counties in West Virginia. It took effect at Jul 5, 2018, 9:46 AM EDT. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued
Jul 5, 2018, 4:10 AM EDT (08:10 UTC)
In effect from
Jul 5, 2018, 9:46 AM EDT
Expired
Jul 5, 2018, 10:47 PM EDT
In force
13 hr
Issued by
NWS Pittsburgh, PA
Flood severity
None
All 34 counties

Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Muskingum County, OH, Noble County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Preston County, WV, Tucker County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 28 km from the middle of the area, began a volume at 08:10 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 (KAGC), launched 00:00Z, 8.2 hours before the alert went out and 28 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, Pittsburgh, PA at 00:00Z on 2018-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1183 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, Pittsburgh, PA at 00:00Z on 2018-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.1939Sfc1 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
1183 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1641 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Jul 5, 1:59 AM EDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jul 5, 1:59 AM EDT, 2 hours 11 minutes before
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Hazardous weather outlook, Jul 4, 7:41 PM EDT, 8 hours 29 minutes before
Hazardous Weather Outlook
National Weather Service Pittsburgh PA
741 PM EDT Wed Jul 4 2018

MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029-031-073>076-WVZ001>004-012-021-509>514-052345-
Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson-
Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest-
Lawrence-Butler-Clarion-Beaver-Allegheny-Armstrong-Indiana-
Washington-Greene-Westmoreland-Westmoreland Ridges-Fayette-
Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
741 PM EDT Wed Jul 4 2018

This Hazardous Weather Outlook is for western Maryland, east
central Ohio, northwest Pennsylvania, southwest Pennsylvania, west
central Pennsylvania, western Pennsylvania, northern West Virginia
and northern panhandle of West Virginia.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

34

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 8:31 PM EDTSpecial Weather StatementPBZAllegheny44 min
Jul 4, 8:37 PM EDTFlash Flood WarningPBZAllegheny, Westmoreland113 min
Jul 4, 9:26 PM EDTSevere Thunderstorm WarningPBZButler34 min
Jul 4, 10:43 PM EDTAreal Flood AdvisoryPBZAllegheny, Westmoreland4 hr
Jul 4, 11:08 PM EDTFlash Flood WarningPBZForest3 hr
Jul 5, 2:51 AM EDTAreal Flood AdvisoryPBZWestmoreland3 hr
Jul 5, 2:55 AM EDTAreal Flood AdvisoryPBZIndiana, Westmoreland3 hr
Jul 5, 4:18 AM EDTAreal Flood AdvisoryPBZIndiana3 hr
Jul 5, 5:32 AM EDTAreal Flood AdvisoryPBZArmstrong, Indiana3 hr
Jul 5, 5:40 AM EDTAreal Flood AdvisoryPBZAllegheny, Westmoreland94 min
Jul 5, 7:07 AM EDTFlash Flood WarningPBZAllegheny3 hr
Jul 5, 12:59 PM EDTSpecial Weather StatementPBZMercer31 min
Jul 5, 1:02 PM EDTSpecial Weather StatementPBZButler28 min
Jul 5, 1:31 PM EDTSpecial Weather StatementPBZBeaver29 min
Jul 5, 1:44 PM EDTSpecial Weather StatementPBZMercer31 min
Jul 5, 1:55 PM EDTSevere Thunderstorm WarningPBZButler, Mercer, Venango35 min
Jul 5, 2:00 PM EDTSevere Thunderstorm WarningPBZBeaver, Butler, Lawrence30 min
Jul 5, 2:39 PM EDTSevere Thunderstorm WarningPBZBeaver36 min
Jul 5, 2:44 PM EDTSevere Thunderstorm WarningPBZButler31 min
Jul 5, 2:50 PM EDTSpecial Weather StatementPBZJefferson55 min
Jul 5, 3:03 PM EDTAreal Flood AdvisoryPBZClarion73 min
Jul 5, 3:13 PM EDTSpecial Weather StatementPBZBeaver47 min
Jul 5, 3:34 PM EDTSevere Thunderstorm WarningPBZBeaver, Washington41 min
Jul 5, 3:58 PM EDTSpecial Weather StatementPBZIndiana47 min
Jul 5, 5:04 PM EDTSevere Thunderstorm WarningPBZWashington56 min
Jul 5, 5:32 PM EDTSevere Thunderstorm WarningPBZGreene, Washington58 min
Jul 5, 6:09 PM EDTSevere Thunderstorm WarningPBZGreene, Washington51 min
Jul 5, 5:37 AM EDTAreal Flood AdvisoryPBZMonroe, Noble3 hr
Jul 5, 11:49 AM EDTFlash Flood WarningPBZMonroe81 min
Jul 5, 3:28 PM EDTSpecial Weather StatementPBZCarroll, Jefferson47 min
Jul 5, 3:42 PM EDTSpecial Weather StatementPBZMuskingum48 min
Jul 5, 4:05 PM EDTSpecial Weather StatementPBZMuskingum40 min
Jul 5, 4:32 PM EDTSpecial Weather StatementPBZNoble28 min
Jul 5, 4:55 PM EDTSpecial Weather StatementPBZNoble35 min
Jul 5, 5:44 PM EDTSevere Thunderstorm WarningPBZCarroll, Harrison, Tuscarawas46 min
Jul 5, 5:58 PM EDTSpecial Weather StatementPBZColumbiana62 min
Jul 5, 6:17 PM EDTSevere Thunderstorm WarningPBZCarroll, Harrison, Jefferson, Tuscarawas43 min
Jul 5, 6:26 PM EDTFlash Flood WarningPBZBelmont2 hr
Jul 5, 3:15 PM EDTSpecial Weather StatementPBZTucker45 min
Jul 5, 4:58 PM EDTSpecial Weather StatementPBZOhio47 min
Jul 5, 6:00 PM EDTAreal Flood AdvisoryPBZOhio2 hr
Jul 5, 6:26 PM EDTSpecial Weather StatementPBZWetzel34 min

Nearby

Flash Flood Watches in Pennsylvania, 2018Flash Flood Watches in Ohio, 2018Flash Flood Watches in West Virginia, 2018Every flash flood watch in 2018

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.