Alert archive / Delaware / Frost Advisories in 2021
Frost Advisory 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this frost advisory at Nov 5, 2021, 2:36 PM EDT for Sussex County, Delaware. It took effect at Nov 6, 2021, 12:00 AM EDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Nov 5, 2021, 2:36 PM EDT (18:36 UTC)
- In effect from
- Nov 6, 2021, 12:00 AM EDT
- Expired
- Nov 6, 2021, 9:00 AM EDT
- In force
- 9 hr
- Issued by
- NWS Philadelphia/Mount Holly
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 18 km from the middle of the area, began a volume at 18:33 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.6 hours before the alert went out and 84 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
- 1472 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
581 WWUS71 KPHI 051836 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 236 PM EDT Fri Nov 5 2021 DEZ003-060900- /O.NEW.KPHI.FR.Y.0004.211106T0400Z-211106T1300Z/ Inland Sussex- Including the city of Georgetown 236 PM EDT Fri Nov 5 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM EDT SATURDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Inland Sussex. * WHEN...From midnight tonight to 9 AM EDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
2 follow-up statements
719 WWUS71 KPHI 060716 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 316 AM EDT Sat Nov 6 2021 DEZ003-061300- /O.CON.KPHI.FR.Y.0004.000000T0000Z-211106T1300Z/ Inland Sussex- Including the city of Georgetown 316 AM EDT Sat Nov 6 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING... * WHAT...Temperatures as low as 29 will result in frost formation. * WHERE...Inland Sussex. * WHEN...Until 9 AM EDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ MPS
021 WWUS71 KPHI 061254 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 854 AM EDT Sat Nov 6 2021 DEZ003-061400- /O.EXP.KPHI.FR.Y.0004.000000T0000Z-211106T1300Z/ Inland Sussex- Including the city of Georgetown 854 AM EDT Sat Nov 6 2021 ...FROST ADVISORY WILL EXPIRE AT 9 AM EDT THIS MORNING... Temperatures will continue to rise through the morning. Therefore, the frost advisory will be allowed to expire. $$ Johnson
Nearby
Frost Advisories in Delaware, 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.