Alert archive / Pennsylvania / Flash Flood Warnings in 1988

Flash Flood Warning 4, NWS State College, PA

May 18, 1988Franklin County, Pennsylvania

NWS State College, PA issued this flash flood warning at May 18, 1988, 8:28 PM EDT for Franklin County, Pennsylvania. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
May 18, 1988, 8:28 PM EDT (00:28 UTC)
Expired
May 19, 1988, 2:15 AM EDT
In force
6 hr
Issued by
NWS State College, PA
Area
Whole counties

County Franklin County, PA

The radar

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

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 0.5 hours before the alert went out and 209 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 1988-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1988-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
587 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
146 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 KHAR 190029
FFWHAR
PAC055-190530-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HARRISBURG PA
828 PM EDT WED MAY 18 1988
 
THE NATIONAL WEATHER SERVICE IN HARRISBURG HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  130 AM EDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH CENTRAL PENNSYLVANIA
          ...SOUTH CENTRAL FRANKLIN
 
AT 825 PM PENNSYLVANIA STATE POLICE AT CHAMBERSBURG REPORTED FLOODING
ON ROUTE 11 NORTHBOUND IN GREENCASTLE BORO.
RADAR HAS INDICATED SHOWERS AND ISOLATED THUNDERSTORMS MOVING ACROSS
FRANKLIN COUNTY FOR THE PAST SEVERALS HOURS AND MAY CONTINUE TO DO SO
THROUGHOUT THE NIGHT.
 
 
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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.

In the hours before

Local storm report, May 18, 3:32 PM EDT, 4 hours 56 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE HARRISBURG PA.
ISSUED 330 PM EDT   WED  MAY 18 1988

               EVENT               DATE/TIME   COUNTY      CITY

4.5 INCHES OF RAIN IN ONE HOUR.
REPORTED BY COUNTY EOC.           5/17/155PM EDT ADAMS  CASHTOWN
PEA SIZE HAIL. DEPTH OF 6
INCHES. REPORTED BY HAMS.         5/17/320PM EDT ADAMS  NORTH OF
                                                        GETTYSBURG
PEA TO GOLFBALL SIZE HAIL.
REPORTED BY HAMS.                 5/17/348PM EDT YORK   JUST EAST OF
                                                        ABBOTTSTOWN
6-8 INCHES OF WATER ON ROUTE
116. REPORTED BY HAMS.            5/17/415PM EDT YORK   NORTHWEST OF
                                                        HANOVER.
POWER LINES DOWN. REPORTED
BY HAMS.                          5/17/440PM EDT YORK   HANOVER
PENNYSIZE HAIL. REPORTED
BY COUNTY EOC.                     5/17/424PM EDT YORK     SPRINGROVE

END
WSO HAR NEFF,

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 11:31 PM EDTFlash Flood WarningCTPAdams5 hr
May 19, 5:46 AM EDTFlash Flood WarningCTPAdams6 hr
May 19, 7:34 AM EDTFlash Flood WarningCTPLancaster6 hr
May 19, 8:45 AM EDTFlash Flood WarningCTPClinton6 hr
May 19, 1:19 PM EDTFlash Flood WarningCTPFranklin6 hr
May 19, 2:10 PM EDTFlash Flood WarningCTPLycoming6 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1988Every flash flood warning in 1988

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.