Alert archive / Pennsylvania / Frost Advisories in 2021

Frost Advisory 4, NWS State College, PA

May 30, 20214 counties in Pennsylvania

NWS State College, PA issued this frost advisory at May 30, 2021, 5:29 PM EDT for 4 counties in Pennsylvania. It took effect at May 31, 2021, 2:00 AM EDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
May 30, 2021, 5:29 PM EDT (21:29 UTC)
In effect from
May 31, 2021, 2:00 AM EDT
Expired
May 31, 2021, 7:01 AM EDT
In force
5 hr
Issued by
NWS State College, PA

Counties Elk County, PA, McKean County, PA, Potter County, PA, Warren County, PA

The radar

The State College radar (KCCX), 99 km from the middle of the area, began a volume at 21:31 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 9.5 hours before the alert went out and 137 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, Buffalo Intl Airport, NY at 12:00Z on 2021-05-30Temperature 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, Buffalo Intl Airport, NY at 12:00Z on 2021-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -49 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1771 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-49 m²/s²
0-3 km storm-relative helicity
-37 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

215 
WWUS71 KCTP 302129
NPWCTP

URGENT - WEATHER MESSAGE
National Weather Service State College PA
529 PM EDT Sun May 30 2021

PAZ004>006-010-311200-
/O.NEW.KCTP.FR.Y.0004.210531T0600Z-210531T1200Z/
Warren-McKean-Potter-Elk-
Including the cities of Warren, Bradford, Coudersport, St. Marys,
and Ridgway
529 PM EDT Sun May 30 2021

...FROST ADVISORY IN EFFECT FROM 2 AM TO 8 AM EDT MONDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...Warren, McKean, Potter and Elk Counties.

* WHEN...From 2 AM to 8 AM EDT Monday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants and vegetation from the
cold. Potted plants should be brought inside.

The latest forecast information can be found on the
NWS State College Facebook page and Twitter @NWSStateCollege,
or on the web at weather.gov/ctp.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/ctp
1 follow-up statement
855 
WWUS71 KCTP 311101
NPWCTP

URGENT - WEATHER MESSAGE
National Weather Service State College PA
701 AM EDT Mon May 31 2021

PAZ004>006-010-311215-
/O.CAN.KCTP.FR.Y.0004.000000T0000Z-210531T1200Z/
Warren-McKean-Potter-Elk-
Including the cities of Warren, Bradford, Coudersport, St. Marys,
and Ridgway
701 AM EDT Mon May 31 2021

...FROST ADVISORY IS CANCELLED...

Temperatures will rise quickly through the 40s early this morning
and end the frost threat. 

$$

MRS

Nearby

Frost Advisories in Pennsylvania, 2021Every frost advisory 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.