Alert archive / Pennsylvania / Flash Flood Warnings in 1993

Flash Flood Warning 1, NWS State College, PA

March 4, 1993Lancaster County, Pennsylvania

NWS State College, PA issued this flash flood warning at Mar 4, 1993, 5:00 PM EST for Lancaster County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Mar 4, 1993, 5:00 PM EST (22:00 UTC)
Expired
Mar 4, 1993, 9:00 PM EST
In force
4 hr
Issued by
NWS State College, PA
Area
Whole counties

County Lancaster County, PA

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 10.0 hours before the alert went out and 163 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, Atlantic City In, NJ at 12:00Z on 1993-03-04Temperature 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, Atlantic City In, NJ at 12:00Z on 1993-03-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 243 square meters per square second.1939587897Sfc1 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
533 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
243 m²/s²
0-3 km storm-relative helicity
395 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 042158
FFWHAR
PAC071-050200-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE HARRISBURG PA
500 PM EST THU MAR 4 1993
 
THE NATIONAL WEATHER SERVICE IN HARRISBURG HAS ISSUED A
SMALL STREAM AND URBAN FLOOD WARNING EFFECTIVE UNTIL  900 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTH CENTRAL PENNSYLVANIA
 
   ...SOUTHERN LANCASTER COUNTY
 
AMATUER RADIO OPERATORS IN SOUTHERN LANCASTER COUNTY REPORT THAT THE
PEQUEA CREEK HAS GONE OVER ITS BANKS NEAR THE TOWN OF PARADISE. THE
PARKING LOT OF THE REVERE TAVERN HAS NEEN FLOODED.
 
ADDITIONAL LIGHT TO MODERATE RAIN CAN BE EXPECTED OVER THE REGION INTO
THE EVENING...THEREFORE FLOODING WILL CONTINUE.
 
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.
 
BF

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

Special weather statement, Mar 4, 1:29 PM EST, 3 hours 31 minutes before
PAZ009-013-008-006-042100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HARRISBURG PA.
120 PM EST THU MAR 04 1993

...HIGH WINDS...FALLEN TREES...AND FLOODED ROADS...

DURING THE PAST HOUR THE FOLLOWING REPORTS HAVE BEEN RECEIVED:

ADAMS COUNTY...GETTYSBURG...WIND GUST TO 58 MPH. POWER LINES DOWNED
   AND SOME ROADS CLOSED DUE TO FALLEN TREES.

YORK COUNTY...DILLSBURG AREA...TREES AND WIRES DOWN AND STREET FLOODING.

CUMBERLAND COUNTY...DOWN TREES AND POWER LINES DUE TO ICE AND WINDS.
   ROOFS BLOWN OFF HOUSES.

STRONG WINDS ARE LIKELY FOR THE REMAINDER OF THE AFTERNOON.  DRIVING
CONDITIONS WILL BE ESPECIALLY HAZARDOUS DUE TO THE WINDS AND FROZEN
ROADWAYS...ESPECIALLY AT HIGHER ELEVATIONS.

IF YOU MUST VENTURE OUT THIS AFTERNOON...SLOW DOWN AND STAY
ALERT FOR STRONG WINDS.

PRA
Special weather statement, Mar 4, 1:29 PM EST, 3 hours 31 minutes before
PAZ007-008-014-042100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILLIAMSPORT PA
130 PM EST THU FEB 4 1993

...WINTER WEATHER ADVISORY CONTINUES IN EFFECT THIS AFTERNOON AND
TONIGHT OVER PORTIONS OF NORTHCENTRAL PENNSYLVANIA...
...SLEET CAUSING SOME SLIPPERY ROAD CONDITIONS ACROSS THE REGION...

...ADVISORY INFORMATION...
A WINTER WEATHER ADVISORY REMAINS IN EFFECT THIS AFTERNOON AND TONIGHT
FOR 2 TO 4 INCHES OF SNOW ACROSS THE NORTHERN TIER COUNTIES OF
NORTHCENTRAL PENNSYLVANIA.  THIS ADVISORY INCLUDES BRADFORD...NORTHERN
LYCOMING...TIOGA AND SULLIVAN COUNTIES.  THIS ADVISORY DOES NOT
INCLUDE LOCK HAVEN...WILLIAMSPORT OR CITIES IN THE MIDDLE SUSQUEHANNA
VALLEY.

...THIS AFTERNOON...
A MIXTURE OF RAIN...SLEET AND SNOW CONTINUED TO FALL ACROSS ALL OF
NORTHCENTRAL PENNSYLVANIA EARLY THIS AFTERNOON.  NATIONAL WEATHER
SERVICE SPOTTERS HAVE ALSO REPORTED ISOLATED POCKETS OF FREEZING RAIN.
ANY SNOW ACCUMULATIONS HAVE BEEN MINIMAL.

HOWEVER...SLEET HAS BEEN ACCUMULATING IN MANY LOCATIONS CAUSING SOME
SLIPPERY ROAD CONDITIONS.  AS OF 1 PM...ONE HALF OF AN INCH /.5/ OF
SLEET HAD ACCUMULATED HERE AT THE WILLIAMSPORT-LYCOMING COUNTY
AIRPORT.  REPORTS FROM LOCAL POLICE AND HAM RADIO OPERATORS INDICATE
THAT ROADS ARE SLIPPERY...ESPECIALLY IN THE HIGHER ELEVATIONS.

LITTLE CHANGE IS EXPECTED FOR THE REST OF THE AFTERNOON WITH A MIXED
BAG OF WINTER WEATHER CONTINUING TO FALL ACROSS THE REGION.  ONLY
LIGHT ACCUMULATIONS OF SNOW ARE EXPECTED IN THE HIGHER ELEVATIONS BY
EVENING WITH ACCUMULATING SNOW STILL A REAL POSSIBILITY TONIGHT.

...PRECAUTIONS...
ANYONE TRAVELING THIS AFTERNOON...ESPECIALLY IN THE MOUNTAINS ACROSS
THE NORTHERN TIER...CAN EXPECT SLIPPERY ROAD CONDITIONS DUE TO SNOW
AND SLEET.  ANOTHER WEATHER CONCERN FOR THIS AFTERNOON WILL BE THE
WIND WHICH MAY GUST BETWEEN 30 AND 40 MPH AT TIMES.  THE GUSTY WINDS
MAY CREATE PROBLEMS FOR HIGH PROFILE VEHICLES.  THIS WILL BE A
CHANGING WEATHER SITUATION. LISTEN TO NOAA WEATHER RADIO OR LOCAL NEWS
MEDIA FOR THE LATEST NATIONAL WEATHER SERVICE FORECASTS AND
STATEMENTS.

...WEATHER FACTORS...
A LOW PRESSURE SYSTEM OVER KENTUCKY AND ANOTHER LOW OVER SOUTHERN
VIRGINIA WILL MOVE SLOWLY NORTH AND EAST TODAY AND FRIDAY.  THIS WILL
PULL ATLANTIC MOISTURE INTO THE STATE RESULTING IN A MIXED BAG OF
PRECIPITATION ACROSS NORTHCENTRAL PENNSYLVANIA THROUGH FRIDAY.

JSN
Special weather statement, Mar 4, 4:29 PM EST, 31 minutes before
PAZ007-008-014-050000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILLIAMSPORT PA
430 PM EST THU FEB 4 1993

...WINTER WEATHER ADVISORY IN EFFECT TONIGHT AND FRIDAY FOR ALL OF
NORTHCENTRAL PENNSYLVANIA...
...WINTER STORM WARNING FOR NORTHERN CLINTON COUNTY...
...LOCALLY STRONG WINDS EXPECTED ACROSS THE REGION THIS EVENING...

...ADVISORY INFORMATION...
A WINTER WEATHER ADVISORY IS IN EFFECT TONIGHT AND FRIDAY ACROSS THE
NORTHERN TIER COUNTIES OF NORTHCENTRAL PENNSYLVANIA.  SNOW AMOUNTS
RANGING FROM 3 TO 6 INCHES WILL FALL IN THE ADVISORY AREA.  THIS
INCLUDES...BRADFORD...NORTHERN LYCOMING...TIOGA AND SULLIVAN COUNTIES.

AN ADVISORY FOR 2 TO 4 INCHES OF SNOW IS ALSO IN EFFECT FOR THE WEST
BRANCH AND MIDDLE SUSQUEHANNA VALLEYS.  THIS INCLUDES LOCK HAVEN...
WILLIAMSPORT...LEWISBURG AND SUNBURY.

LOCALLY...AMOUNTS OF UP TO 10 INCHES OF SNOW ARE ALSO POSSIBLE ACROSS
NORTHERN CLINTON COUNTY.

...LATE THIS AFTERNOON...
A MIXTURE OF RAIN...SLEET AND SNOW CONTINUED TO FALL ACROSS ALL OF THE
REGION LATE THIS AFTERNOON.  NATIONAL WEATHER SERVICE SPOTTERS HAVE
ALSO REPORTED ISOLATED POCKETS OF FREEZING RAIN.  ICE WAS ACCUMULATING
ON TREES AND POWER LINES ACROSS SULLIVAN COUNTY.  SNOW AMOUNTS HAVE
REMAINED LIGHT BUT SIGNIFICANT ACCUMULATIONS OF SLEET HAVE BEEN
REPORTED.

AS OF 4 PM...NEARLY ONE INCH /.8/ OF SLEET HAD ACCUMULATED HERE AT THE
WILLIAMSPORT-LYCOMING COUNTY AIRPORT.  NEARLY TWO INCHES OF SLEET WAS
REPORTED NEAR HEPBURNVILLE JUST NORTH OF WILLIAMSPORT.  REPORTS FROM
LOCAL POLICE AND HAM RADIO OPERATORS INDICATE THAT ROADS ARE
SLIPPERY...ESPECIALLY IN THE HIGHER ELEVATIONS.  STRONG AND GUSTY
WINDS HAVE BEEN REPORTED IN THE HIGHER ELEVATIONS WITH SPEEDS
ESTIMATED BETWEEN 40 AND 50 MPH BY NATIONAL WEATHER SERVICE SPOTTERS.

..TONIGHT...
THE MIXED PRECIPITATION WILL CHANGE OVER TO SNOW ACROSS THE NORTHERN
TIER COUNTIES THIS EVENING.  A CHANGE OVER TO SNOW SHOULD TAKE PLACE
IN THE WEST BRANCH AND MIDDLE SUSQUEHANNA VALLEYS NEAR MIDNIGHT.

...PRECAUTIONS...
DRIVING CONDITIONS WILL BECOME HAZARDOUS TONIGHT THROUGHOUT THE
REGION.  WHERE RAIN AND SLEET FELL DURING THE AFTERNOON...ROADS WILL
BECOME VERY SLIPPERY AS TEMPERATURES FALL BELOW FREEZING.
ANOTHER WEATHER CONCERN FOR THIS EVENING WILL BE THE WIND WHICH MAY
GUST BETWEEN 40 AND 50 MPH AT TIMES.  THE GUSTY WINDS COULD DOWN POWER
LINES AND SMALL TREE LIMBS AND WILL BE ESPECIALLY HAZARDOUS FOR HIGH
PROFILE VEHICLES.

THIS IS A RAPIDLY CHANGING WEATHER SITUATION.  LISTEN TO NOAA WEATHER
RADIO OR LOCAL NEWS MEDIA FOR THE LATEST NATIONAL WEATHER SERVICE
FORECASTS AND STATEMENTS.

...WEATHER FACTORS...
A LOW PRESSURE SYSTEM OVER SOUTHERN OHIO AND A SECOND LOW OVER EASTERN
VIRGINIA WILL MOVE SLOWLY NORTH AND EAST TONIGHT AND FRIDAY.  THIS
INTENSE STORM SYSTEM WILL PROVIDE THE WINTER WEATHER TO THE REGION.

JSN
Special weather statement, Mar 4, 5:00 PM EST, 0 minutes before
PAZ007-008-014-050100-

SPECIAL WEATHER STATEMENT...CORRECTION
NATIONAL WEATHER SERVICE WILLIAMSPORT PA
600 PM EST THU FEB 4 1993

...WINTER WEATHER ADVISORY IN EFFECT TONIGHT AND FRIDAY FOR ALL OF
NORTHCENTRAL PENNSYLVANIA...
...WINTER STORM WARNING FOR NORTHERN CLINTON COUNTY...

...ADVISORY INFORMATION...
A WINTER WEATHER ADVISORY IS IN EFFECT TONIGHT AND FRIDAY ACROSS THE
NORTHERN TIER COUNTIES OF NORTHCENTRAL PENNSYLVANIA.  SNOW AMOUNTS
RANGING FROM 3 TO 6 INCHES WILL FALL IN THE ADVISORY AREA.  THIS
INCLUDES...BRADFORD...NORTHERN LYCOMING...TIOGA AND SULLIVAN COUNTIES.

AN ADVISORY FOR 2 TO 4 INCHES OF SNOW IS ALSO IN EFFECT FOR THE WEST
BRANCH AND MIDDLE SUSQUEHANNA VALLEYS.  THIS INCLUDES LOCK HAVEN...
WILLIAMSPORT...LEWISBURG AND SUNBURY.

LOCALLY...AMOUNTS OF UP TO 10 INCHES OF SNOW ARE ALSO POSSIBLE ACROSS
NORTHERN CLINTON COUNTY.

...LATE THIS AFTERNOON...
A MIXTURE OF RAIN...SLEET AND SNOW CONTINUED TO FALL ACROSS ALL OF THE
REGION LATE THIS AFTERNOON.  NATIONAL WEATHER SERVICE SPOTTERS HAVE
ALSO REPORTED ISOLATED POCKETS OF FREEZING RAIN.  ICE WAS ACCUMULATING
ON TREES AND POWER LINES ACROSS SULLIVAN COUNTY.  SNOW AMOUNTS HAVE
REMAINED LIGHT BUT SIGNIFICANT ACCUMULATIONS OF SLEET HAVE BEEN
REPORTED.

AS OF 6 PM...THE PRECIPITATION WAS ALL SNOW ACROSS THE NORTHERN TIER
COUNTIES WHERE 2 TO 3 INCHES OF NEW SNOW HAD FALLEN.  FARTHER
SOUTH...THE PRECIPITATION WAS MAINLY A MIX OF RAIN...SLEET AND SNOW.
NEARLY ONE INCH OF SLEET HAD ACCUMULATED HERE AT THE
WILLIAMSPORT-LYCOMING COUNTY AIRPORT.  NEARLY TWO INCHES OF SLEET WAS
REPORTED NEAR HEPBURNVILLE JUST NORTH OF WILLIAMSPORT.  REPORTS FROM
LOCAL POLICE AND HAM RADIO OPERATORS INDICATE THAT ROADS ARE
SLIPPERY...ESPECIALLY IN THE HIGHER ELEVATIONS.

..TONIGHT...
THE MIXED PRECIPITATION WILL CHANGE OVER TO SNOW ACROSS THE REGION
TONIGHT.  MOST AREAS IN THE NORTHERN TIER COUNTIES HAVE ALREADY
CHANGED OVER TO SNOW...WITH HEAVY SNOW FALLING IN SOME PLACES.

...PRECAUTIONS...
DRIVING CONDITIONS WILL BECOME HAZARDOUS TONIGHT THROUGHOUT THE
REGION.  WHERE RAIN AND SLEET FELL DURING THE AFTERNOON...ROADS WILL
BECOME VERY SLIPPERY AS TEMPERATURES FALL BELOW FREEZING.

THIS IS A RAPIDLY CHANGING WEATHER SITUATION.  LISTEN TO NOAA WEATHER
RADIO OR LOCAL NEWS MEDIA FOR THE LATEST NATIONAL WEATHER SERVICE
FORECASTS AND STATEMENTS.

...WEATHER FACTORS...
A LOW PRESSURE SYSTEM OVER SOUTHERN OHIO AND A SECOND LOW OVER EASTERN
VIRGINIA WILL MOVE SLOWLY NORTH AND EAST TONIGHT AND FRIDAY.  THIS
INTENSE STORM SYSTEM WILL PROVIDE THE WINTER WEATHER TO THE REGION.

KJF

Nearby

Flash Flood Warnings in Pennsylvania, 1993Every flash flood warning in 1993

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.