Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS State College, PA

June 9, 2021Chester County, Pennsylvania

NWS State College, PA issued this special weather statement at Jun 9, 2021, 8:54 PM EDT for Chester County, Pennsylvania. It was in force for 21 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
Jun 9, 2021, 8:54 PM EDT (00:54 UTC)
Expired
Jun 9, 2021, 9:15 PM EDT
In force
21 min
Issued by
NWS State College, PA

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 00:55 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 00:00Z, 0.9 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, Washington/Dulle, VA at 00:00Z on 2021-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 186 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2021-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
186 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
1395 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Jun 9, 2:45 PM EDT, 6 hours 9 minutes earlier.

Area forecast discussion, Jun 9, 2:45 PM EDT, 6 hours 9 minutes before
Area Forecast Discussion
National Weather Service State College PA
245 PM EDT Wed Jun 9 2021

.SYNOPSIS...
Muggy conditions will continue to support isolated to scattered
drenching downpours through late week. Cooler and more seasonable
temperatures are expected Friday into next week with a lingering
chance of showers and thunderstorms.

&&

.NEAR TERM /THROUGH TONIGHT/...
Early afternoon analysis indicates 850 mb theta-e axis still draped
across south central PA, which is the focus for showers and
thunderstorms with heavy rainfall from southwest Centre County
through Clearfield and Jefferson Counties. The area continues to
slowly settle south, but will need to be watched for stalling
and training through the late afternoon.

Elsewhere tropical-like air mass spawning numerous narrow
updrafts throughout, with brief moderate-heavy downpours and
isolated thunder accompanying each. Some cells along the NY
border have been borderline severe with isold tree damage
reported in Tioga County and some tall storms currently over
Potter. Abundant moisture (PW 1-2") and 65-70F Td remains in
place, while low level inflow and the mean 850-300mb wind are
weak, maintaining localized heavy rainfall threat through early
evening...with WPC ERO MRGL having been nudged northward to
include all but east central/north central and northeast
sections. Diurnal heating/instability should allow convection
to concentrate mainly in the afternoon and evening hours.
Convective coverage gradually fizzles and fades into tonight
with lingering activity confined primarily to the southwest 1/2
of the CWA as aforementioned theta-e axis settles slowly WSW.

Another mild and muggy night across most of the area with fcst
minTs +10-15F above normal in the 60-70F range NW to SE.

&&

.SHORT TERM /THURSDAY/...
Another day of boundary focused showers and thunderstorms is
expected for the Laurel Highlands and southern tier as
quasistationary boundary lies across that area. Improving and
drying conditions seen from north to south across northern and
central areas with a noticeable difference in Td and cooler max
temps, along with good decrease in shower coverage. Lower highs
fcst on Thursday with 24hrMaxTChange trending 3-6F lower across
the southeast 2/3 of the CWA.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
We will see a marked cooldown by Friday, as a backdoor cold
front slips just south of the area. However, the front will
remain close enough to keep a chc of showers in the forecast
across southern PA.

Heading into the weekend and early next week, expect
temperatures to turn milder again. The weather will remain
unsettled, although no single day looks like a washout, as a
series of shortwaves drop southeastward across the northeastern
United States. Scattered showers and storms are possible with
each shortwave, but models differ on the exact timing and
strength of the shortwaves. Have maintained at least a slight
chc of showers and aftn thunder through the period.

A more significant cold front is projected to cross the area by
the middle of next week, ushering in cooler and drier
conditions for the second half of next week.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
At 18z, numerous showers and storms are popping up over the
higher terrain of northern and western PA, and a few showers are
beginning to develop over the Susq Valley as well.

Expect SHRA/TSRA activity to continue to through the remainder
of the day, and have VCTS at all TAF sites into this evening.
Localized, brief restrictions are expected in any
showers/storms and brief gusty winds are possible in the
vicinity of any storms.

Lingering SHRA/TSRA should diminish tonight. Patchy fog is
possible tonight, especially in areas that receive rainfall
today.

Outlook...

Thu-Mon...Predominantly VFR, although scattered showers/storms
may cause brief restrictions, esp during the aftn/eve hours.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
None.

&&

SYNOPSIS...DeVoir/Steinbugl
NEAR TERM...DeVoir/Steinbugl
SHORT TERM...DeVoir/Steinbugl
LONG TERM...Evanego
AVIATION...Evanego
Hazardous weather outlook, Jun 9, 7:52 PM EDT, 1 hour 2 minutes before
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In the hours before

Special weather statement, Jun 9, 7:05 PM EDT, 1 hour 49 minutes before
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Special weather statement, Jun 9, 7:54 PM EDT, 1 hour before
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Special weather statement, Jun 9, 8:00 PM EDT, 54 minutes before
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Local storm report, Jun 9, 8:03 PM EDT, 51 minutes before
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Local storm report, Jun 9, 8:47 PM EDT, 7 minutes before
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Special weather statement, Jun 9, 8:54 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 8:00 PM EDTSpecial Weather StatementCTPLancaster15 min
Jun 9, 8:03 PM EDTSevere Thunderstorm WarningCTPLancaster27 min
Jun 9, 8:20 PM EDTAreal Flood AdvisoryCTPLancaster85 min
Jun 10, 6:19 AM EDTAreal Flood AdvisoryCTPBlair, Cambria86 min
Jun 10, 11:47 AM EDTFlash Flood WatchCTPAdams, Bedford, Blair, Cambria, Cumberland, Franklin and 5 more9 hr
Jun 10, 3:05 PM EDTSpecial Weather StatementCTPYork40 min
Jun 10, 3:56 PM EDTAreal Flood AdvisoryCTPAdams, Franklin, York3 hr

Nearby

Special Weather Statements in Pennsylvania, 2021Every special weather statement in 2021

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.