Alert archive / Pennsylvania / Flash Flood Warnings in 1998

Flash Flood Warning 36, NWS Pittsburgh, PA

April 10, 1998Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Apr 10, 1998, 6:25 AM EDT for Westmoreland County, Pennsylvania. It was in force for 4 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: Apr 10, 1998, 6:25 AM EDT (10:25 UTC)
Expired: Apr 10, 1998, 10:00 AM EDT
In force: 4 hr
Issued by: NWS Pittsburgh, PA
Area: Whole counties

County Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 68 km from the middle of the area, began a volume at 10:24 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

Pittsburgh, PA (KPIT), launched 00:00Z, 10.4 hours before the alert went out and 55 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 750 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -58 m²/s²
0-3 km storm-relative helicity: 9 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.

In the hours before

Local storm report, Apr 10, 4:49 AM EDT, 1 hour 36 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 1:31 AM EDT	Flash Flood Warning	PBZ	Westmoreland	3 hr
Apr 10, 4:31 AM EDT	Flash Flood Warning	PBZ	Westmoreland	2 hr
Apr 10, 4:33 AM EDT	Flash Flood Warning	PBZ	Westmoreland	2 hr

Nearby

Flash Flood Warnings in Pennsylvania, 1998 Every 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.