Alert archive / Pennsylvania / Tornado Warnings in 1990

Tornado Warning 5, NWS Pittsburgh, PA

July 22, 1990Butler County, Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Jul 22, 1990, 5:58 PM EDT for Butler County, Pennsylvania. It was in force for 62 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: Jul 22, 1990, 5:58 PM EDT (21:58 UTC)
Expired: Jul 22, 1990, 7:00 PM EDT
In force: 62 min
Issued by: NWS Pittsburgh, PA
Area: Whole counties

County Butler County, PA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 22, 6:03 PM EDT	Tornado F0	Butler, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 10.0 hours before the alert went out and 58 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: 6 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 609 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPIT 222158
TORPIT
PAC019-222300-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
558 PM EDT SUN JUL 22 1990
 
THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  700 PM EDT
FOR THE FOLLOWING LOCATION...
 
IN WEST PENNSYLVANIA
 
   ...BUTLER COUNTY
 
NUMEROUS REPORTS OF FUNNEL CLOUDS AND DAMAGING WINDS HAVE BEEN
RECEIVED IN BEAVER COUNTY. THE THUNDERSTORMS PRODUCING THIS DANGEROUS
WEATHER WILL MOVE INTO BUTLER COUNTY. TAKE COVER.
 
THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE
IN THE PATH OF THIS TORNADO MOVE TO A SHELTER BELOW GROUND IF
AVAILABLE.  OTHERWISE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST
FLOHOR POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES
FOR A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 8:48 PM EDT	Flash Flood Warning	PBZ	Fayette, Greene	2 hr
Jul 22, 4:18 PM EDT	Flash Flood Warning	PBZ	Allegheny, Butler	102 min
Jul 22, 5:31 PM EDT	Tornado Warning	PBZ	Beaver	59 min
Jul 22, 6:38 PM EDT	Flash Flood Warning	PBZ	Clearfield	67 min
Jul 22, 6:57 PM EDT	Tornado Warning	PBZ	Butler	63 min
Jul 22, 7:24 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion	66 min

Nearby

Tornado Warnings in Pennsylvania, 1990 Every tornado warning in 1990 Tornadoes in 1990

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.