Alert archive / Pennsylvania / Flash Flood Warnings in 1995

Flash Flood Warning 18, NWS State College, PA

June 25, 1995York County, Pennsylvania

NWS State College, PA issued this flash flood warning at Jun 25, 1995, 4:44 PM EDT for York County, Pennsylvania. It was in force for 61 min.

The area

The counties it named.

The facts

Issued
Jun 25, 1995, 4:44 PM EDT (20:44 UTC)
Expired
Jun 25, 1995, 5:45 PM EDT
In force
61 min
Issued by
NWS State College, PA
Area
Whole counties

County York County, PA

The radar

The Sterling radar (KLWX), 124 km from the middle of the area, began a volume at 20:43 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.7 hours before the alert went out and 249 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, Wallops Is Stn, VA at 12:00Z on 1995-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 335 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, Wallops Is Stn, VA at 12:00Z on 1995-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 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
335 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
527 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
8 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jun 25, 1:06 PM EDT, 3 hours 38 minutes earlier.

Area forecast discussion, Jun 25, 1:06 PM EDT, 3 hours 38 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
105 PM EDT SUN JUN 25 1995

SOME RW/TRW ON RADAR...BASED ON POSITION OF UA LOW AND WK TROUGH
ALONG LAKE...WORSE WILL BE LAKE SHORE AREA AND WEST OF MTS.
STILL A FEW RW/TRW EAST OF MTS...LWR SUSQ...GIVEN SOME HEATING
AND HI DEWPTS DOWN THERE.

EXPECT ACTIVITY TO DIE DOWN AFTER SUNSET.

THINK MODELS OVERDO SIT. MON AFT/NIGHT...AS BEST DYNAMICS LOOK TO
BE FOCUS ON S. APP. MTNS AGAIN.  HARD TO SEE A QPF MAX.

NGM MAY OVERDO COLD AIR WEDGE TUE AM AGAIN.  AIR MASS WILL NOT BE
VERY DEEP.

MARTIN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 3:22 PM EDTFlash Flood WarningCTPWarren68 min
Jun 25, 3:22 PM EDTSevere Thunderstorm WarningCTPWarren68 min
Jun 25, 5:40 PM EDTFlash Flood WarningCTPAdams2 hr
Jun 25, 6:45 PM EDTFlash Flood WarningCTPFranklin2 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1995Every flash flood warning in 1995

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.