Alert archive / Maryland / Frost Advisories in 2008

Frost Advisory 11, NWS Philadelphia/Mount Holly

October 30, 2008Kent County, Sussex County, Delaware; 4 counties in Maryland

NWS Philadelphia/Mount Holly issued this frost advisory at Oct 30, 2008, 3:00 PM EDT for Kent County, Sussex County, Delaware; 4 counties in Maryland. It took effect at Oct 31, 2008, 3:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Oct 30, 2008, 3:00 PM EDT (19:00 UTC)
In effect from: Oct 31, 2008, 3:00 AM EDT
Expired: Oct 31, 2008, 9:00 AM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 37 km from the middle of the area, began a volume at 19:03 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.0 hours before the alert went out and 62 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1371 m above ground
0-6 km bulk shear: 84 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 93 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 301900
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
300 PM EDT THU OCT 30 2008

...AREAS OF FROST EXPECTED OVERNIGHT AND EARLY FRIDAY MORNING...

DEZ002>004-MDZ012-015-019-020-310900-
/O.NEW.KPHI.FR.Y.0011.081031T0700Z-081031T1300Z/
KENT-INLAND SUSSEX-DELAWARE BEACHES-KENT MD-QUEEN ANNES-TALBOT-
CAROLINE-
INCLUDING THE CITIES OF...DOVER...GEORGETOWN...REHOBOTH BEACH...
CHESTERTOWN...CENTREVILLE...EASTON...DENTON
300 PM EDT THU OCT 30 2008

...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM EDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FROST
ADVISORY, WHICH IS IN EFFECT FROM 3 AM TO 9 AM EDT FRIDAY.

HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE AREA TONIGHT, ALLOWING 
FOR A CLEAR SKY AND LIGHT WINDS. THIS IN COMBINATION WITH A DRY 
AIRMASS WILL ALLOW TEMPERATURES TO DROP TO THE MID 30S BY DAYBREAK 
ON FRIDAY. SOME INLAND LOCATIONS MAY HAVE TEMPERATURES DROP TO
NEAR FREEZING OVERNIGHT. SINCE MUCH LIGHTER WINDS ARE EXPECTED, A
GREATER POTENTIAL TO FORM A WIDESPREAD FROST WILL EXIST OVERNIGHT
AND EARLY FRIDAY MORNING.

TO PROLONG ANY PLANTS IN THIS REMAINING GROWING SEASON, TAKE
PROTECTIVE MEASURES TO DO SO BY BRINGING IN ANY OUTDOOR PLANTS IF
POSSIBLE. THOSE PLANTS THAT ARE STILL GOING AND CANNOT BE BROUGHT
INDOORS, COVER THEM UP TO PROTECT THEM FROM THE EXPECTED COLD
CONDITIONS. THIS ROUND OF COLD WEATHER MAY END THE REMAINING
GROWING SEASON ACROSS THE REGION.

A FROST ADVISORY MEANS THAT AREAS OF FROST IS EXPECTED.

$$

GORSE

2 follow-up statements

000 
WWUS71 KPHI 310731
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
331 AM EDT FRI OCT 31 2008

...AREAS OF FROST ARE EXPECTED EARLY THIS MORNING...

DEZ002>004-MDZ012-015-019-020-311300-
/O.CON.KPHI.FR.Y.0011.000000T0000Z-081031T1300Z/
KENT-INLAND SUSSEX-DELAWARE BEACHES-KENT MD-QUEEN ANNES-TALBOT-
CAROLINE-
INCLUDING THE CITIES OF...DOVER...GEORGETOWN...REHOBOTH BEACH...
CHESTERTOWN...CENTREVILLE...EASTON...DENTON
331 AM EDT FRI OCT 31 2008

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...

A FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING. 

HIGH PRESSURE WAS CAUSING CLEAR SKIES AND LIGHT WINDS EARLY THIS
MORNING, WHICH ALLOWED HEAT TO RADIATE AWAY FROM THE EARTHS
SURFACE. TEMPERATURES EARLY THIS MORNING AT MANY LOCATIONS WERE
IN THE LOWER AND MID 30S...AND SOME INLAND LOCATIONS WERE NEAR
FREEZING. AREAS OF FROST ARE LIKELY TO OCCUR EARLY THIS MORNING.

PROTECTIVE MEASURES...SUCH AS COVERING VULNERABLE VEGETATION OR
BRINGING PLANTS INDOORS...SHOULD ALREADY HAVE BEEN TAKEN.

THIS ROUND OF COLD TEMPERATURES IS LIKELY TO END THE GROWING
SEASON ACROSS THE REGION.

A FROST ADVISORY MEANS THAT AREAS OF FROST ARE EXPECTED.

$$

000 
WWUS71 KPHI 311252
NPWPHI

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
852 AM EDT FRI OCT 31 2008

DEZ002>004-MDZ012-015-019-020-311400-
/O.EXP.KPHI.FR.Y.0011.000000T0000Z-081031T1300Z/
KENT-INLAND SUSSEX-DELAWARE BEACHES-KENT MD-QUEEN ANNES-TALBOT-
CAROLINE-
INCLUDING THE CITIES OF...DOVER...GEORGETOWN...REHOBOTH BEACH...
CHESTERTOWN...CENTREVILLE...EASTON...DENTON
852 AM EDT FRI OCT 31 2008

...FROST ADVISORY WILL EXPIRE AT 9 AM EDT THIS MORNING...

THE FROST ADVISORY WILL EXPIRE AT 9 AM EDT THIS MORNING. 

TEMPERATURES DIPPED INTO THE UPPER 20S IN MANY LOCATIONS ON 
THE DELMARVA EARLY THIS MORNING. HOWEVER, THESE TEMPERATURES ARE NOW 
REBOUNDING AS THE MORNING SUN CONTINUES TO SHINE. WITH TEMPERATURES 
NOW ABOVE FREEZING IN MOST LOCATIONS, THE FROST ADVISORY WILL BE 
ALLOWED TO EXPIRE AT 9AM.

SINCE A HARD FREEZE HAS NOW OCCURRED OVER THE DELMARVA, THIS WILL BE 
THE LAST FROST ADVISORY/FREEZE WARNING STATEMENT THIS SEASON.

$$

Nearby

Frost Advisories in Maryland, 2008 Frost Advisories in Delaware, 2008 Every frost advisory in 2008

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.