Alert archive / Pennsylvania / Lake Effect Snow Warnings in 2007

Lake Effect Snow Warning 5, NWS State College, PA

April 7, 2007Warren County, Pennsylvania

NWS State College, PA issued this lake effect snow warning at Apr 7, 2007, 4:11 AM EDT for Warren County, Pennsylvania. It was in force for 32 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 7, 2007, 4:11 AM EDT (08:11 UTC)
Expired
Apr 8, 2007, 11:57 AM EDT
In force
32 hr
Issued by
NWS State College, PA

County Warren County, PA

The radar

The Buffalo radar (KBUF), 134 km from the middle of the area, began a volume at 08:13 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, 8.2 hours before the alert went out and 171 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, Pittsburgh, PA at 00:00Z on 2007-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Pittsburgh, PA at 00:00Z on 2007-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
877 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this lake effect snow warning 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 lake effect snow warning went out at Apr 7, 2:11 AM EDT, 2 hours earlier.

Area forecast discussion, Apr 7, 2:11 AM EDT, 2 hours before
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Hazardous weather outlook, Apr 6, 2:29 PM EDT, 13 hours 42 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
229 PM EDT FRI APR 6 2007

PAZ006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-071830-
POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-NORTHERN CENTRE-
SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-JUNIATA-SOMERSET-
BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING-SULLIVAN-
SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-
ADAMS-YORK-LANCASTER-
229 PM EDT FRI APR 6 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A STORM SYSTEM WILL MOVE TOWARD PENNSYLVANIA AND ARRIVE DURING
THE MIDDLE OF THE UPCOMING WEEK. THIS STORM HAS THE POTENTIAL TO
PRODUCE EITHER RAIN OR SNOW OVER THE REGION DEPENDING ON THE
ACTUAL TRACK. THE AREAS THAT ARE MORE LIKELY TO SEE SNOWFALL WOULD
BE THE HIGHER ELEVATIONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ004-005-071830-
WARREN-MCKEAN-
229 PM EDT FRI APR 6 2007

...LAKE EFFECT SNOW ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO
11 AM EDT SATURDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   LAKE EFFECT SNOW ADVISORY

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   LAKE EFFECT SNOW ADVISORY

ALSO...A STORM SYSTEM WILL MOVE TOWARD PENNSYLVANIA AND ARRIVE
DURING THE MIDDLE OF THE UPCOMING WEEK. THIS STORM HAS THE
POTENTIAL TO PRODUCE EITHER RAIN OR SNOW OVER THE REGION DEPENDING
ON THE ACTUAL TRACK. THE AREAS THAT ARE MORE LIKELY TO SEE
SNOWFALL WOULD BE THE HIGHER ELEVATIONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS...PLEASE REPORT SNOWFALL.

DANGELO

In the hours before

Special weather statement, Apr 7, 12:15 AM EDT, 3 hours 56 minutes before
SPECIAL WEATHER STATEMENT...UPDATED
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1215 AM EDT SAT APR 7 2007

PAZ017>019-080445-
CLEARFIELD-NORTHERN CENTRE-SOUTHERN CENTRE-
1215 AM EDT SAT APR 7 2007

...INTENSE SNOW SQUALLS AFFECTING PORTIONS OF CLEARFIELD AND CENTRE
COUNTIES...

AT 1213 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE AN INTENSE...PERSISTENT SNOW BAND LOCATED ALONG OR JUST
SOUTH OF A LINE EXTENDING FROM CURWENSVILLE...PHILLIPSBURG TO STATE
COLLEGE AND POTTERS MILLS. LOCALLY HEAVY SNOW SQUALLS EMBEDDED WITH
THE INTENSE SNOW BAND WILL REMAIN NEARLY STATIONARY THROUGH 1245 AM.

THE SNOW WILL RAPIDLY DROP VISIBILITIES IN THE SQUALL TO LESS THAN A
HALF OF A MILE. IN ADDITION...A QUICK ONE TO THREE INCHES OF SNOW
MAY QUICKLY ACCUMULATE ON UNTREATED ROADS...BRIDGES AND OVERPASSES.

THE SNOW WILL FALL ONTO WARM ROAD SURFACES...WHICH WILL CAUSE IT TO
QUICKLY MELT AND THEN RE-FREEZE. THIS COULD CREATE VERY ICY
CONDITIONS IF THE ROAD SURFACE IS UNTREATED.

USE EXTREME CAUTION IF YOU MUST TRAVEL INTO OR THROUGH THIS
POTENTIALLY DANGEROUS SNOW SQUALL. CONSIDER DELAYING TRAVEL UNTIL THE
SQUALL PASSES YOUR LOCATION.

FORECASTER:KF/STEINBUGL

Nearby

Lake Effect Snow Warnings in Pennsylvania, 2007Every lake effect snow warning in 2007

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.