Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 133, NWS Pittsburgh, PA

August 16, 2001Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 16, 2001, 8:12 PM EDT for Jefferson County, Pennsylvania. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 16, 2001, 8:12 PM EDT (00:12 UTC)
Expired: Aug 16, 2001, 9:15 PM EDT
In force: 63 min
Issued by: NWS Pittsburgh, PA
Area: Whole counties

County Jefferson County, PA

What was reported inside it

Time	Report	Where	Remark
Aug 16, 8:30 PM EDT	Thunderstorm Wind	Brookville, PA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 0.2 hours before the alert went out and 122 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: 357 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1283 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 16, 3:00 PM EDT, 5 hours 12 minutes earlier.

Area forecast discussion, Aug 16, 3:00 PM EDT, 5 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
300 PM EDT THU AUG 16 2001

THE LINE OF SHOWERS AND THUNDERSTORMS WHICH MOVED THRU THE SW PA
EARLIER THIS MORNING HAS RAPIDLY MOVED OFF TO THE EAST.  WIND GUSTS
OF 35 TO 40 MPH WERE REPORTED WITH THIS LINE.  HEAVY CLOUDCOVER OFF
TO THE WEST SHOULD LIMIT THE DAYTIME HEATING NEEDED TO FUEL
CONVECTION AND STEEPENING LAPSE RATES IN THE SHORT TERM.  SHOWERS
AND THUNDERSTORMS WILL FIRE UP AGAIN LATER THIS EVENING AS THE COLD
FRONT PUSHES INTO THE AREA. UPPER LEVEL SUPPORT IS IN PLACE WITH THE
LEFT REAR JET QUAD AND WITH A STRONG LOW LEVEL JET MOVING IN, GUSTY
WINDS WILL BE A PRIMARY THREAT. HEAVY RAINS WILL ALSO BE PREVALENT
WITH THE PRECIPITABLE WATER RUNNING AROUND 1.50 INCHES. A 5H VORT
MAX AND STRONG OMEGA WILL ALLOW SUFFICIENT LIFT ALONG THE FRONT TO
SUPPORT CONVECTION AS WELL THIS EVENING.

THE NEXT CHANCE OF RAIN LOOKS TO BE SUNDAY, AS ANOTHER SHORTWAVE
RIPPLES THRU THE UPPER LEVEL TROUGH.  SHOWERS AND THUNDERSTORMS WILL
BE LIKELY AGAIN WITH THIS SYSTEM.  OTHERWISE THE WEEK LOOKS GREAT
WITH SEASONABLE TEMPS LOCKING IN ON THE AREA.

PALKO/HRINDA

.PBZ...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.

In the hours before

Local storm report, Aug 16, 7:11 PM EDT, 1 hour 1 minute before

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Special weather statement, Aug 16, 7:27 PM EDT, 45 minutes before

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Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2001 Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.