Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS State College, PA

September 18, 2012Adams County, Pennsylvania

NWS State College, PA issued this special weather statement at Sep 18, 2012, 11:24 AM EDT for Adams County, Pennsylvania. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 18, 2012, 11:24 AM EDT (15:24 UTC)
Expired
Sep 18, 2012, 12:00 PM EDT
In force
36 min
Issued by
NWS State College, PA

County Adams County, PA

The radar

The Sterling radar (KLWX), 108 km from the middle of the area, began a volume at 15:25 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 3.4 hours before the alert went out and 110 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, Washington/Dulle, VA at 12:00Z on 2012-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 371 joules per kilogram.LCLEL10008507005003002001001 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, Washington/Dulle, VA at 12:00Z on 2012-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 322 square meters per square second.19395878Sfc1 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
371 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
454 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
322 m²/s²
0-3 km storm-relative helicity
403 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.2

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this special weather statement went out at Sep 18, 9:35 AM EDT, 1 hour 49 minutes earlier.

Area forecast discussion, Sep 18, 9:35 AM EDT, 1 hour 49 minutes before
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Hazardous weather outlook, Sep 18, 6:30 AM EDT, 4 hours 54 minutes before
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In the hours before

Special weather statement, Sep 18, 10:10 AM EDT, 1 hour 14 minutes before
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Special weather statement, Sep 18, 10:43 AM EDT, 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1043 AM EDT TUE SEP 18 2012

PAZ036-181515-
FRANKLIN PA-
1043 AM EDT TUE SEP 18 2012

...SHOWERS WITH STRONG WIND GUSTS WILL AFFECT FRANKLIN COUNTY...

AT 1040 AM EDT...SHOWERS WITH STRONG WIND GUSTS WERE LOCATED FROM ST.
THOMAS TO PECKTONVILLE...MOVING NORTHEAST AT 45 MPH.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE SHOWERS. VERY HEAVY RAIN
WILL FALL FROM THE SHOWERS...AND WILL CAUSE WATER TO POND ON ROADS
AND FILL POOR DRAINAGE AREAS. THESE SHOWERS WILL AFFECT UPPER
STRASBURG...ORRSTOWN...WAYNESBORO AND FAYETTEVILLE.

THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 1 AND 25.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE
30.

LAT...LON 4000 7785 4015 7760 4013 7757 4004 7752
      3997 7745 3995 7747 3972 7746 3972 7806

FORECASTER: RXR
Special weather statement, Sep 18, 11:24 AM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1124 AM EDT TUE SEP 18 2012

PAZ036-064-065-181600-
ADAMS PA-FRANKLIN PA-YORK PA-
1124 AM EDT TUE SEP 18 2012

...SHOWERS WITH STRONG WIND GUSTS WILL AFFECT ADAMS...SOUTHEASTERN
FRANKLIN AND SOUTHWESTERN YORK COUNTIES...

AT 1120 AM EDT...SHOWERS WITH STRONG WIND GUSTS WERE LOCATED FROM
HEIDLERSBURG TO CARROLL VALLEY TO 12 MILES SOUTHEAST OF SMITHSBURG...
MOVING NORTHEAST AT 40 MPH.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THESE SHOWERS. VERY HEAVY RAIN
WILL FALL FROM THESE SHOWERS...AND WILL CAUSE WATER TO POND ON ROADS
AND FILL POOR DRAINAGE AREAS. THESE SHOWERS WILL AFFECT LAKE
MEADE...WELLSVILLE...NEW OXFORD AND THOMASVILLE.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE
15...ROUTE 30...STATE ROAD 94...STATE ROAD 97.

LAT...LON 3972 7774 3998 7753 3999 7748 3996 7745
      3999 7740 4003 7719 4009 7711 4013 7698
      3994 7686 3971 7685

FORECASTER: RXR

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 10:10 AM EDTSpecial Weather StatementCTPFulton35 min
Sep 18, 10:43 AM EDTSpecial Weather StatementCTPFranklin32 min
Sep 18, 11:32 AM EDTSpecial Weather StatementCTPJuniata, Snyder28 min
Sep 18, 12:02 PM EDTSpecial Weather StatementCTPAdams, York43 min
Sep 18, 12:07 PM EDTSpecial Weather StatementCTPColumbia, Montour, Northumberland23 min
Sep 18, 12:32 PM EDTSevere Thunderstorm WarningCTPAdams, Lancaster, York43 min
Sep 18, 12:46 PM EDTSpecial Weather StatementCTPColumbia, Montour, Northumberland29 min
Sep 18, 12:52 PM EDTAreal Flood AdvisoryCTPAdams, Columbia, Cumberland, Dauphin, Lancaster, Lebanon and 5 more3 hr
Sep 18, 1:16 PM EDTSevere Thunderstorm WarningCTPAdams, York59 min
Sep 18, 1:22 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, Schuylkill53 min
Sep 18, 2:00 PM EDTFlash Flood WarningCTPAdams, Cumberland, Dauphin, Lancaster, Lebanon, Schuylkill and 1 more5 hr
Sep 18, 2:13 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Dauphin, Lancaster, Lebanon, Schuylkill and 1 more62 min
Sep 18, 3:11 PM EDTSevere Thunderstorm WarningCTPLancaster, York79 min
Sep 18, 3:18 PM EDTSpecial Weather StatementCTPSchuylkill57 min

Nearby

Special Weather Statements in Pennsylvania, 2012Every special weather statement in 2012

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.