Alert archive / Pennsylvania / Flash Flood Warnings in 2000

Flash Flood Warning 30, NWS Pittsburgh, PA

July 28, 2000Allegheny County, Washington County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Jul 28, 2000, 5:21 PM EDT for Allegheny County, Washington County, Pennsylvania. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 28, 2000, 5:21 PM EDT (21:21 UTC)
Expired: Jul 28, 2000, 7:45 PM EDT
In force: 2 hr
Issued by: NWS Pittsburgh, PA
Area: Whole counties

Counties Allegheny County, PA, Washington County, PA

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.4 hours before the alert went out and 9 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1099 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 128 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 
WGUS51 KPBZ 282123
FFWPBZ
PAC003-125-282345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
521 PM EDT FRI JUL 28 2000

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ALLEGHENY COUNTY IN PENNSYLVANIA
  NORTHWESTERN WASHINGTON COUNTY IN PENNSYLVANIA

* UNTIL 745 PM EDT

* AT 521 PM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED VERY
  HEAVY RAIN FALLING OVER LOCATIONS IN NORTHERN WASHINGTON COUNTY
  AND WESTERN ALLEGHENY COUNTY. THIS RAIN WAS FALLING OVER AREAS
  WHICH HAD FLOODED EARLIER THIS AFTERNOON. THESE STORMS ARE MOVING
  TO THE EAST AT AROUND 10 MPH.

<<CALL TO ACTION>>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. VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Jul 28, 3:03 PM EDT, 2 hours 18 minutes earlier.

Area forecast discussion, Jul 28, 3:03 PM EDT, 2 hours 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
303 PM EDT FRI JUL 28 2000

LOTS OF LOW LEVEL MOISTURE PRODUCING TORRENTIAL DOWNPOURS AND
ISOLATED SEVERE THUNDERSTORMS.  POSTED A FLASH FLOOD WATCH TIL 10 PM
FOR ALL OF CWA.

UPPER LOW TO THE WEST DIGS A LITTLE TO THE SOUTHWEST OVER THE NEXT
SEVERAL DAYS WITH VORT LOBES WRAPPING AROUND.  WILL REMAIN IN
SOUTHWEST FLOW WITH CHANCE THUNDERSTORMS EACH DAY THROUGH
EXTENDED.

.PBZ...
MD...FLASH FLOOD WATCH UNTIL 1000 PM EDT FRIDAY FOR ZONE MDZ001.

OH...FLASH FLOOD WATCH UNTIL 1000 PM EDT FRIDAY FOR ZONES
OHZ039>041...OHZ048>050...OHZ057>059...OHZ068>069.

PA...FLASH FLOOD WATCH UNTIL 1000 PM EDT FRIDAY FOR ZONES
PAZ007>009...PAZ013>016...PAZ020>023...PAZ029>032.

WV...FLASH FLOOD WATCH UNTIL 1000 PM EDT FRIDAY FOR ZONES
WVZ001>004...WVZ012...WVZ021>023...WVZ041.

In the hours before

Local storm report, Jul 28, 3:42 PM EDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
342 PM EDT FRI JUL 28 2000

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....m

0310 PM    LOWER BURRELL             PA   FLOODING
07/28/00   WESTMORELAND                   ROAD FLOODING.  PEOPLE
                                          TRAPPED IN CARS.

Local storm report, Jul 28, 3:47 PM EDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
347 PM EDT FRI JUL 28 2000

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....L

0330 PM    IMPERIAL                  PA   FLOODING
07/28/00   ALLEGHENY                      ROAD FLOODING

Local storm report, Jul 28, 3:52 PM EDT, 1 hour 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
352 PM EDT FRI JUL 28 2000

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....3

0345 PM    BURGETTSTOWN              PA   FLOODING
07/28/00   WASHINGTON                     ROAD FLOODING

Local storm report, Jul 28, 4:16 PM EDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
416 PM EDT FRI JUL 28 2000

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....[

0330 PM    AMBRIDGE                  PA   FLOODING
07/28/00   BEAVER                         ROAD FLOODING

Local storm report, Jul 28, 4:47 PM EDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
447 PM EDT FRI JUL 28 2000

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0410 PM    DRESDEN                   OH   .75 INCH HAIL
07/28/00   MUSKINGUM

0410 PM    DRESDEN                   OH   WIND DAMAGE
07/28/00   MUSKINGUM                      TREES DOWN

0430 PM    MINERVA                   OH   .75 INCH HAIL
07/28/00   CARROLL

Local storm report, Jul 28, 5:16 PM EDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
516 PM EDT FRI JUL 28 2000

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0430 PM    COSHOCTON                 OH   WIND DAMAGE
07/28/00   COSHOCTON                      WIRES AND LARGE LIMBS DOWN
                                          E OF COSHOCTON ON COUNTY
                                          ROAD 16.

NNNN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 2:14 PM EDT	Flash Flood Warning	PBZ	Allegheny, Beaver	3 hr
Jul 28, 2:23 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	67 min
Jul 28, 2:35 PM EDT	Severe Thunderstorm Warning	PBZ	Westmoreland	55 min
Jul 28, 2:52 PM EDT	Flash Flood Warning	PBZ	Westmoreland	3 hr
Jul 28, 3:05 PM EDT	Flash Flood Warning	PBZ	Washington	3 hr
Jul 28, 3:09 PM EDT	Flash Flood Warning	PBZ	Armstrong	3 hr
Jul 28, 3:21 PM EDT	Flash Flood Warning	PBZ	Indiana	3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2000 Every flash flood warning in 2000

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.