Alert archive / Pennsylvania / Frost Advisories in 2009

Frost Advisory 5, NWS Philadelphia/Mount Holly

May 31, 2009Carbon County, Monroe County, Pennsylvania; Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this frost advisory at May 31, 2009, 1:55 PM EDT for Carbon County, Monroe County, Pennsylvania; Sussex County, New Jersey. It took effect at Jun 1, 2009, 12:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
May 31, 2009, 1:55 PM EDT (17:55 UTC)
In effect from
Jun 1, 2009, 12:00 AM EDT
Expired
Jun 1, 2009, 7:00 AM EDT
In force
7 hr
Issued by
NWS Philadelphia/Mount Holly

Counties Sussex County, NJ, Carbon County, PA, Monroe County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 17:57 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

Brookhaven, NY (KOKX), launched 12:00Z, 5.9 hours before the alert went out and 201 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, Brookhaven, NY at 12:00Z on 2009-05-31Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2009-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.1939587897Sfc1 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
2390 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
118 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 
WWUS71 KPHI 311755
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
155 PM EDT SUN MAY 31 2009

...VERY COOL AIR WILL MOVE OVER THE REGION AND CAUSE SCATTERED
FROST IN THE POCONOS AND NORTHWEST NEW JERSEY TONIGHT...

NJZ001-PAZ054-055-010800-
/O.NEW.KPHI.FR.Y.0005.090601T0400Z-090601T1100Z/
SUSSEX-CARBON-MONROE-
INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG
155 PM EDT SUN MAY 31 2009

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 7 AM EDT
MONDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FROST
ADVISORY...WHICH IS IN EFFECT FROM MIDNIGHT TONIGHT TO 7 AM EDT
MONDAY. 

COOL DRY AIR WILL OVERSPREAD THE REGION TONIGHT. THIS COOL AIR
COMBINED WITH CLEAR SKIES AND WINDS THAT WILL BECOME LIGHT WILL
CAUSE TEMPERATURES TO DROP TO THE MIDDLE AND UPPER 30S AND IN TURN
WILL CAUSE SCATTERED FROST TO FORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

RNS
2 follow-up statements
000 
WWUS71 KPHI 010740
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
340 AM EDT MON JUN 1 2009

NJZ001-PAZ054-055-011100-
/O.CON.KPHI.FR.Y.0005.000000T0000Z-090601T1100Z/
SUSSEX-CARBON-MONROE-
INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG
340 AM EDT MON JUN 1 2009

...FROST ADVISORY REMAINS IN EFFECT UNTIL 7 AM EDT THIS MORNING...

A FROST ADVISORY REMAINS IN EFFECT UNTIL 700 AM.

A CLEAR SKY AND A LIGHT WIND HAVE ALLOWED TEMPERATURES TO DROP
INTO THE UPPER 30S AND LOWER 40S EARLY THIS MORNING IN PARTS OF
THE POCONO REGION OF PENNSYLVANIA AND IN SUSSEX COUNTY, NEW
JERSEY.

THE COLD TEMPERATURES COULD ALLOW PATCHY FROST TO DEVELOP.

ONCE THE SUN RISES, TEMPERATURES WILL BEGIN TO RECOVER QUICKLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE HARMED IF LEFT UNPROTECTED.

&&

$$

IOVINO
000 
WWUS71 KPHI 011054
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
654 AM EDT MON JUN 1 2009

NJZ001-PAZ054-055-011200-
/O.EXP.KPHI.FR.Y.0005.000000T0000Z-090601T1100Z/
SUSSEX-CARBON-MONROE-
INCLUDING THE CITIES OF...NEWTON...JIM THORPE...STROUDSBURG
654 AM EDT MON JUN 1 2009

...FROST ADVISORY WILL EXPIRE AT 7 AM EDT THIS MORNING...

THE FROST ADVISORY WILL EXPIRE AT 7 AM EDT THIS MORNING. 

THE FROST ADVISORY FOR CARBON AND MONROE COUNTIES IS PENNSYLVANIA
AND SUSSEX COUNTY IN NEW JERSEY WILL BE ALLOWED TO EXPIRE AT 7AM EDT.
TEMPERATURES HOVER IN THE UPPER 30S ACROSS THE REGION AT THIS TIME
BUT AS THE SUN CONTINUES TO RISE THIS MORNING, TEMPERATURES WILL
BEGIN TO REBOUND. 

$$

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 31, 8:26 AM EDTSpecial Marine WarningPHI54 min

Nearby

Frost Advisories in Pennsylvania, 2009Frost Advisories in New Jersey, 2009Every frost advisory in 2009

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.