Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 10, NWS Pittsburgh, PA

April 9, 2001Armstrong County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Apr 9, 2001, 3:32 PM EDT for Armstrong County, Pennsylvania. It was in force for 58 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: Apr 9, 2001, 3:32 PM EDT (19:32 UTC)
Expired: Apr 9, 2001, 4:30 PM EDT
In force: 58 min
Issued by: NWS Pittsburgh, PA
Area: Whole counties

County Armstrong County, PA

The radar

The Pittsburgh radar (KPBZ), 71 km from the middle of the area, began a volume at 19:35 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.

What was reported inside it

Time	Report	Where	Remark
Apr 9, 4:15 PM EDT	Thunderstorm Wind	Kittanning, PA	Thunderstorm winds downed a large tree.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 9, 11:00 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 7.5 hours before the alert went out and 70 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: 841 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1013 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KPBZ 091932
SVRPIT
PAC005-092030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
332 PM EDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ARMSTRONG COUNTY IN PENNSYLVANIA

* UNTIL 430 PM EDT

* AT 332 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES NORTHWEST OF WEST HILLS...MOVING EAST
  AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  4 MILES NORTH OF KITTANNING AT 340 PM...

<<CALL TO ACTION>>SEVERE THUNDERSTORMS CAN SOMETIMES PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING. SEEK SHLETER IN A
BASEMENT OR INTERIOR ROOM IF A TORNADO IS SPOTTED.

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 Apr 9, 11:50 AM EDT, 3 hours 42 minutes earlier.

Area forecast discussion, Apr 9, 11:50 AM EDT, 3 hours 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
1150 AM EDT MON APR 9 2001

UPDATED ZONE FORECASTS TO INCLUDE SEVERE THUNDERSTORM WATCH AND SOME
TIMING OF WORST STORMS. LINE OF POTENTIALLY SEVERE STORMS CONTINUES
TO MOVE EAST AT 40 MPH ACROSS OHIO. WILL ARRIVE IN EAST CENTRAL OHIO
AND NORTHERN WEST VIRGINIA PANHANDLE EARLY THIS AFTERNOON. SOUTHWEST
PENNSYLVANIA INTO MID AFTERNOON...NORTHERN WEST VIRGINIA AND WESTERN
MARYLAND MID TO LATE AFTERNOON. DAMAGING WIND AND LARGE HAIL ARE
MAIN CONCERN. WILL MONITOR RAINFALL AMOUNTS AS MUCH RAIN LAST NIGHT
OVER NORTHERN SECTIONS OF EAST CENTRAL OHIO AND ALSO FOOTHILLS OF
LAUREL MOUNTAINS IN SOUTHWEST PENNSYLVANIA. ...GIORDANO

.PBZ...
MD...NONE.
OH...SEVERE THUNDERSTORM WATCH UNTIL 500 PM EDT MONDAY FOR ZONES
OHZ039>041...OHZ048>050...OHZ057>059...OHZ068>069.

PA...SEVERE THUNDERSTORM WATCH UNTIL 500 PM EDT MONDAY FOR ZONES
PAZ007>009...PAZ013>016...PAZ020>023...PAZ029>032.

WV...SEVERE THUNDERSTORM WATCH UNTIL 500 PM EDT MONDAY FOR ZONES
WVZ001>004.

In the hours before

Special weather statement, Apr 9, 10:56 AM EDT, 4 hours 36 minutes before

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-
029>032-WVZ001>004-092100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1056 AM EDT MON APR 9 2001

...SEVERE THUNDERSTORM WATCH IN EFFECT
   UNTIL 500 PM EDT MONDAY AFTERNOON...

IN PENNSYLVANIA THIS WATCH INCLUDES 15 COUNTIES...
  ALLEGHENY       ARMSTRONG       BEAVER          BUTLER
  CLARION         FAYETTE         FOREST          GREENE
  INDIANA         JEFFERSON       LAWRENCE        MERCER
  VENANGO         WASHINGTON      WESTMORELAND

IN OHIO THIS WATCH INCLUDES 11 COUNTIES...
  BELMONT         CARROLL         COLUMBIANA      COSHOCTON
  GUERNSEY        HARRISON        JEFF,ERSON       MONROE
  MUSKINGUM       NOBLE           TUSCARAWAS

IN WEST VIRGINIA THIS WATCH INCLUDES 4 COUNTIES...
  BROOKE          HANCOCK         MARSHALL        OHIO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 2:58 AM EDT	Severe Thunderstorm Warning	PBZ	Washington	47 min
Apr 9, 12:57 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	63 min
Apr 9, 1:45 PM EDT	Severe Thunderstorm Warning	PBZ	Venango	60 min
Apr 9, 1:52 PM EDT	Severe Thunderstorm Warning	PBZ	Forest	53 min
Apr 9, 2:30 PM EDT	Severe Thunderstorm Warning	PBZ	Lawrence	60 min
Apr 9, 2:45 PM EDT	Tornado Warning	PBZ	Lawrence	45 min
Apr 9, 3:02 PM EDT	Tornado Warning	PBZ	Butler	43 min
Apr 9, 4:01 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	59 min
Apr 9, 4:04 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	56 min
Apr 9, 4:07 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	53 min
Apr 9, 4:10 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	65 min
Apr 9, 4:18 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	57 min
Apr 9, 4:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Westmoreland	60 min
Apr 9, 4:55 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	65 min
Apr 9, 5:52 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	53 min
Apr 9, 6:03 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	57 min
Apr 9, 6:15 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	60 min
Apr 9, 7:17 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	58 min

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; radar from the NEXRAD Level II archive.