Alert archive / Pennsylvania / Flash Flood Warnings in 1998

Flash Flood Warning 73, NWS State College, PA

May 6, 1998Lancaster County, Pennsylvania

NWS State College, PA issued this flash flood warning at May 6, 1998, 4:15 PM EDT for Lancaster County, Pennsylvania. It was in force for 3 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
May 6, 1998, 4:15 PM EDT (20:15 UTC)
Expired
May 6, 1998, 7:15 PM EDT
In force
3 hr
Issued by
NWS State College, PA
Area
Whole counties

County Lancaster County, PA

The radar

The Dover AFB radar (KDOX), 152 km from the middle of the area, began a volume at 20:19 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.3 hours before the alert went out and 65 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, Phillips Aaf/Abe, MD at 12:00Z on 1998-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 230 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, Phillips Aaf/Abe, MD at 12:00Z on 1998-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
230 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
463 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCTP 062015
FFWCTP
PAC071-062315-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
415 PM EDT WED MAY 6 1998

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LANCASTER COUNTY IN SOUTHEASTERN PENNSYLVANIA

* UNTIL 715 PM EDT

* AT 410 PM STATE COLLEGE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  FALLING OVER MUCH OF LANCASTER COUNTY. THE RAIN WILL TAPER OFF TO
  SCATTERED SHOWERS BEFORE 6PM...BUT RUNOFF FROM THE EARLIER
  THUNDERSTORMS WILL CONTINUE TO CAUSE PROBLEMS INTO THE EVENING
  HOURS.

* EMERGENCY MANAGEMENT OFFICIALS REPORT MANY ROADS FLOODED IN AND
  AROUND LITITZ.

DON'T DRIVE ACROSS FLOODED ROADS! MOST FLASH FLOOD DEATHS OCCUR IN
AUTOMOBILES.

LA CORTE

IF FLASH FLOODING IS OBSERVED...ACT QUICKLY.  MOVE 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.

NWS State College, PA wrote its last area forecast discussion before this flash flood warning went out at May 6, 3:10 PM EDT, 1 hour 5 minutes earlier.

Area forecast discussion, May 6, 3:10 PM EDT, 1 hour 5 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
310 PM EDT WED MAY 6 1998

...WORKZONES SENT TO NWSFO/S PIT AND PHL VIA PHLADMCTP...

...DISCUSSION...
SHOWERS TRAINING ACROSS THE AREA JUST EAST OF THE SUSQUEHANNA RIVER
LATE THIS AFTERNOON AS THE UPPER LOW DRIFTS SLOWLY EAST ACROSS
SOUTHERN PA. 88-D INDICATES 3 HOUR TOTALS LOCALIZED TOTALS OF OVER 2
INCHES IN A FEW SPOTS...FFG GUIDANCE RANGES FROM 2 TO 3 INCHES IN
THAT AREA. CONSIDERED A SHORT-FUSED WATCH BUT UPPER LOW APPEARS TO
BE MOVING A BIT FASTER THAN YESTERDAY AND SHOWERS WILL BE OUT OF THE
AREA BY EARLY EVENING. WEST OF THE SUSQUEHANNA ENOUGH DRY AIR
APPEARS TO BE IN PLACE SO THAT NOTHING WILL DEVELOP THIS EVENING.
SKIES WILL CLEAR ACROSS THE ENTIRE CWA LATER TONIGHT.

NEXT SYSTEM APPROACHES THE FA ON THURSDAY. MODELS INDICATE THAT RAIN
WILL SPREAD ACROSS THE SW THIRD OF THE CWA THURSDAY AFTERNOON...
THEN ACROSS THE REST OF THE CWA THURSDAY NIGHT. ENOUGH INSTABILITY
IS INDICATED FOR A MENTION OF THUNDER WEST OF THE ALLEGHENY MTNS
THURSDAY NIGHT...THEN ANYWHERE FRIDAY. MODELS INDICATE A GOOD SE
FLOW DEVELOPING THURSDAY NIGHT INTO FRIDAY WITH THE ETA FORECASTING
40 TO 50 KTS AT 850 MB WITH A PRONOUNCED THETA-E AXIS ORIENTED SE TO
NW FROM THE DELMARVA AREA. THE NGM SHOWS MORE OF A SOUTHERLY
ORIENTATION WITH THE MAX ORIGINATING OVER ERN TN. DETAILS ARE
UNCERTAIN AT THIS TIME BUT THERE CERTAINLY APPEARS TO BE THE
POTENTIAL FOR A MODERATE TO HEAVY RAIN EVENT. THE EVENT COULD ALSO
BE OF PARTICULARLY LONG DURATION AS THE 60/72 HR AVN INDICATES THAT
THE UPPER SYSTEM WILL CONTINUE SLOWLY ESE TOWARD THE CENTRAL
APPALACHIANS INTO SATURDAY. WILL ISSUE AN ESF TO ALERT THE AREA THAT
A POTENTIALLY SIGNIFICANT RAIN EVENT IS POSSIBLE FRIDAY INTO THE
WEEKEND.

MSE

The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 8:21 PM EDTFlash Flood WarningCTPBedford6 hr
May 5, 10:13 PM EDTFlash Flood WarningCTPCambria, Somerset4 hr
May 6, 3:02 PM EDTSevere Thunderstorm WarningCTPLancaster63 min
May 6, 3:06 PM EDTSevere Thunderstorm WarningCTPLancaster64 min

Nearby

Flash Flood Warnings in Pennsylvania, 1998Every flash flood warning in 1998

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.