Alert archive / Maryland / Frost Advisories in 2011
Frost Advisory 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this frost advisory at Apr 5, 2011, 3:05 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland; Kent County, Sussex County, Delaware. It took effect at Apr 6, 2011, 3:00 AM EDT. It was in force for 65 min.
The area
The counties it named.
The facts
- Issued
- Apr 5, 2011, 3:05 PM EDT (19:05 UTC)
- In effect from
- Apr 6, 2011, 3:00 AM EDT
- Expired
- Apr 6, 2011, 4:05 AM EDT
- In force
- 65 min
- Issued by
- NWS Philadelphia/Mount Holly
Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Queen Anne's County, MD, Talbot County, MD
The radar
The Dover AFB radar (KDOX), 31 km from the middle of the area, began a volume at 19:04 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, 7.1 hours before the alert went out and 70 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 79 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
744 WWUS71 KPHI 051905 NPWPHI URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 305 PM EDT TUE APR 5 2011 ...THE GROWING SEASON HAS STARTED FOR PORTIONS OF SOUTHERN DELAWARE AND THE ADJACENT EASTERN SHORE OF MARYLAND... .TEMPERATURES HAVE CHILLED CONSIDERABLY FROM THIS MORNINGS VERY WINDY WARM CONDITIONS. READINGS AT 3 PM WERE IN THE 30S FROM WESTERN PENNSYLVANIA INTO WEST VIRGINIA. THIS COLD POOL OF AIR IS HEADING TOWARD THE MID ATLANTIC COAST. THE COMBINATION OF THE VERY CHILLY INCOMING AIR MASS AND THE START OF THE GROWING SEASON HAS PROMPTED THE ISSUANCE OF A FROST ADVISORY. DEZ002-003-MDZ015-019-020-060830- /O.NEW.KPHI.FR.Y.0001.110406T0700Z-110406T1000Z/ KENT-INLAND SUSSEX-QUEEN ANNES-TALBOT-CAROLINE- INCLUDING THE CITIES OF...DOVER...GEORGETOWN...CENTREVILLE... EASTON...DENTON 305 PM EDT TUE APR 5 2011 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 6 AM EDT WEDNESDAY... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 3 AM TO 6 AM EDT WEDNESDAY. * LOCATIONS...THE SOUTHERN TWO THIRDS OF DELAWARE AND ADJACENT PORTIONS OF EASTERN MARYLAND BUT NOT ALONG THE COASTAL WATERS. * HAZARDS...FROST. * TEMPERATURES...WILL DROP INTO THE 30S LATE TONIGHT WITH DIMINISHING WIND. * TIMING...THE BEST CHANCE FOR FROST FORMATION IS BETWEEN 3 AM AND 6 AM WHEN THE MERCURY BOTTOMS OUT BETWEEN 31 AND 36 DEGREES IN THE ADVISORY AREA. * IMPACTS...COULD DAMAGE EARLY SEASON BLOSSOMS AND TENDER VEGETATION. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$ DRAG
1 follow-up statement
124 WWUS71 KPHI 060805 NPWPHI URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 405 AM EDT WED APR 6 2011 DEZ002-003-MDZ015-019-020-060915- /O.CAN.KPHI.FR.Y.0001.000000T0000Z-110406T1000Z/ KENT-INLAND SUSSEX-QUEEN ANNES-TALBOT-CAROLINE- INCLUDING THE CITIES OF...DOVER...GEORGETOWN...CENTREVILLE... EASTON...DENTON 405 AM EDT WED APR 6 2011 ...FROST ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS CANCELLED THE FROST ADVISORY. A LITTLE WIND HANGING ON IN MANY SPOTS AND SOME HIGH CLOUDS MOVING ACROSS THE AREA EARLY THIS MORNING SHOULD LIMIT ANY FROST. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 5:01 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 74 min |
| Apr 5, 5:28 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 62 min |
| Apr 5, 8:55 AM EDT | Special Weather Statement | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 65 min |
| Apr 5, 9:37 AM EDT | Special Weather Statement | PHI | Caroline, Cecil, Kent, Queen Anne's | 53 min |
| Apr 5, 10:20 AM EDT | Severe Thunderstorm Warning | PHI | Caroline, Talbot | 40 min |
| Apr 5, 10:16 AM EDT | Severe Thunderstorm Warning | PHI | New Castle | 44 min |
Nearby
Frost Advisories in Maryland, 2011Frost Advisories in Delaware, 2011Every frost advisory in 2011
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.