Alert archive / Pennsylvania / Flash Flood Warnings in 1991

Flash Flood Warning 7, NWS Pittsburgh, PA

May 13, 1991Clearfield County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at May 13, 1991, 4:28 PM EDT for Clearfield County, Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
May 13, 1991, 4:28 PM EDT (20:28 UTC)
Expired
May 13, 1991, 7:00 PM EDT
In force
3 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Clearfield County, PA

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 8.5 hours before the alert went out and 152 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 12:00Z on 1991-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 944 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, Pittsburgh, PA at 12:00Z on 1991-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
944 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1106 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 2:35 PM EDTFlash Flood WarningPBZClearfield115 min
May 13, 3:35 PM EDTFlash Flood WarningPBZAllegheny115 min
May 13, 4:59 PM EDTSevere Thunderstorm WarningPBZClarion, Jefferson61 min
May 13, 5:43 PM EDTFlash Flood WarningPBZClarion, Jefferson2 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1991Every flash flood warning in 1991

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.