Alert archive / Delaware / Areal Flood Advisories in 2018

Areal Flood Advisory 267, NWS Philadelphia/Mount Holly

August 31, 2018Kent County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Aug 31, 2018, 10:57 AM EDT for Kent County, Delaware. It was in force for 107 min.

The area

The counties it named.

The facts

Issued: Aug 31, 2018, 10:57 AM EDT (14:57 UTC)
Expired: Aug 31, 2018, 12:44 PM EDT
In force: 107 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Kent County, DE

The radar

The Dover AFB radar (KDOX), 31 km from the middle of the area, began a volume at 14:59 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, 3.0 hours before the alert went out and 130 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: 72 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1245 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this areal flood advisory went out at Aug 31, 9:53 AM EDT, 1 hour 4 minutes earlier.

Area forecast discussion, Aug 31, 9:53 AM EDT, 1 hour 4 minutes before

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Hazardous weather outlook, Aug 31, 5:20 AM EDT, 5 hours 37 minutes before

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
520 AM EDT Fri Aug 31 2018

NJZ001-007>010-012-PAZ054-055-061-062-010930-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Carbon-Monroe-
Lehigh-Northampton-
520 AM EDT Fri Aug 31 2018

This Hazardous Weather Outlook is for northern New Jersey,
northwest New Jersey, east central Pennsylvania and northeast
Pennsylvania.

.DAY ONE...Today and Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ001>003-MDZ008-012-015-019-020-NJZ013-015>023-027-PAZ060-070-071-
101>106-010930-
New Castle-Kent-Inland Sussex-Cecil-Kent MD-Queen Annes-Talbot-
Caroline-Western Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Southeastern Burlington-Berks-Delaware-Philadelphia-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
520 AM EDT Fri Aug 31 2018

This Hazardous Weather Outlook is for central Delaware, northern
Delaware, southern Delaware, northeast Maryland, central New
Jersey, southern New Jersey, east central Pennsylvania and
southeast Pennsylvania.

.DAY ONE...Today and Tonight.

Some showers and thunderstorms today will be capable of very heavy
downpours leading to localized flooding especially in poor drainage
areas.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

DEZ004-NJZ014-024>026-010930-
Delaware Beaches-Eastern Monmouth-Atlantic Coastal Cape May-
Coastal Atlantic-Coastal Ocean-
520 AM EDT Fri Aug 31 2018

This Hazardous Weather Outlook is for southern Delaware, central
New Jersey and southern New Jersey.

.DAY ONE...Today and Tonight.

There is a moderate risk for the formation of dangerous rip currents
along the New Jersey shore and the Delaware Beaches through this
evening.

Some showers and thunderstorms today will be capable of very heavy
downpours leading to localized flooding especially in poor drainage
areas.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ450>455-010930-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
520 AM EDT Fri Aug 31 2018

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...Today and Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

ANZ430-431-010930-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
520 AM EDT Fri Aug 31 2018

This Hazardous Weather Outlook is for Delaware Bay Waters.

.DAY ONE...Today and Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

In the hours before

Local storm report, Aug 31, 7:34 AM EDT, 3 hours 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
734 AM EDT FRI AUG 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0719 AM     HEAVY RAIN       SOUTHAMPTON TWP         39.91N  74.73W
08/31/2018  M3.58 INCH       BURLINGTON         NJ   TRAINED SPOTTER

&&

EVENT NUMBER PHI1801457

DAVIS

Local storm report, Aug 31, 8:57 AM EDT, 2 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
857 AM EDT FRI AUG 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0850 AM     HEAVY RAIN       1 ESE THORNBURY TWP     39.91N  75.54W
08/31/2018  M2.00 INCH       DELAWARE           PA   TRAINED SPOTTER

            RAINFALL IN THORNTON IN 45 MINUTES.

&&

EVENT NUMBER PHI1801458

GORSE

Local storm report, Aug 31, 10:08 AM EDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1008 AM EDT FRI AUG 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 AM     FLASH FLOOD      THORNBURY TWP           39.93N  75.50W
08/31/2018                   DELAWARE           PA   TRAINED SPOTTER

            NUMEROUS ROADS IMPASSABLE DUE TO FLASH FLOODING IN
            THORNBURY TOWNSHIP WEST OF CHENEY ROAD. PICTURE ON
            SOCIAL MEDIA SHOWED FLOOD WATERS FLOWING ACROSS A
            ROADWAY. 2 INCHES OF RAIN FELL WITHIN 45 MINUTES.

&&

EVENT NUMBER PHI1801459

GORSE

Local storm report, Aug 31, 10:15 AM EDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1015 AM EDT FRI AUG 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0714 AM     HEAVY RAIN       EASTAMPTON TWP          39.99N  74.75W
08/31/2018  M4.99 INCH       BURLINGTON         NJ   MESONET

            4 INCHES OF RAIN FELL IN 90-MINUTE PERIOD ENDING 624
            AM.

0739 AM     HEAVY RAIN       2 SSE EASTAMPTON TWP    39.98N  74.73W
08/31/2018  M5.58 INCH       BURLINGTON         NJ   MESONET

            5.06 INCHES OF RAIN FELL IN 2-HR PERIOD ENDING 7 AM.

0742 AM     HEAVY RAIN       LUMBERTON               39.96N  74.79W
08/31/2018  M2.32 INCH       BURLINGTON         NJ   MESONET

            6-HOUR RAINFALL.

&&

EVENT NUMBER PHI1801460
EVENT NUMBER PHI1801461
EVENT NUMBER PHI1801462

JRK

Local storm report, Aug 31, 10:55 AM EDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1055 AM EDT FRI AUG 31 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0714 AM     HEAVY RAIN       EASTAMPTON TWP          39.99N  74.75W
08/31/2018  M4.99 INCH       BURLINGTON         NJ   MESONET

            4 INCHES OF RAIN FELL IN 90-MINUTE PERIOD ENDING 624
            AM.

0719 AM     HEAVY RAIN       SOUTHAMPTON TWP         39.91N  74.73W
08/31/2018  M3.58 INCH       BURLINGTON         NJ   TRAINED SPOTTER

0739 AM     HEAVY RAIN       2 SSE EASTAMPTON TWP    39.98N  74.73W
08/31/2018  M5.58 INCH       BURLINGTON         NJ   MESONET

            5.06 INCHES OF RAIN FELL IN 2-HR PERIOD ENDING 7 AM.

0742 AM     HEAVY RAIN       LUMBERTON               39.96N  74.79W
08/31/2018  M2.32 INCH       BURLINGTON         NJ   MESONET

            6-HOUR RAINFALL.

0845 AM     FLASH FLOOD      THORNBURY TWP           39.93N  75.50W
08/31/2018                   DELAWARE           PA   TRAINED SPOTTER

            NUMEROUS ROADS IMPASSABLE DUE TO FLASH FLOODING IN
            THORNBURY TOWNSHIP WEST OF CHENEY ROAD. PICTURE ON
            SOCIAL MEDIA SHOWED FLOOD WATERS FLOWING ACROSS A
            ROADWAY. 2 INCHES OF RAIN FELL WITHIN 45 MINUTES.

0850 AM     HEAVY RAIN       1 ESE THORNBURY TWP     39.91N  75.54W
08/31/2018  M2.00 INCH       DELAWARE           PA   TRAINED SPOTTER

            RAINFALL IN THORNTON IN 45 MINUTES.

&&

EVENT NUMBER PHI1801460 PHI1801457 PHI1801461 PHI1801462 PHI1801459
PHI1801458

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 5:17 AM EDT	Areal Flood Advisory	PHI	Burlington	3 hr
Aug 31, 5:36 AM EDT	Flash Flood Warning	PHI	Burlington	3 hr
Aug 31, 6:27 AM EDT	Flash Flood Warning	PHI	Burlington	3 hr
Aug 31, 6:37 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	53 min
Aug 31, 7:34 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden	2 hr
Aug 31, 9:29 AM EDT	Areal Flood Advisory	PHI	Burlington	119 min
Aug 31, 12:47 PM EDT	Special Marine Warning	PHI		118 min
Aug 31, 1:22 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	4 hr
Aug 31, 4:30 PM EDT	Special Marine Warning	PHI		90 min
Aug 31, 6:52 AM EDT	Areal Flood Advisory	PHI	Philadelphia	4 hr
Aug 31, 7:55 AM EDT	Areal Flood Advisory	PHI	Delaware	3 hr
Aug 31, 10:09 AM EDT	Flash Flood Warning	PHI	Berks	7 hr
Aug 31, 10:14 AM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Aug 31, 1:54 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Lehigh, Montgomery	4 hr
Aug 31, 3:59 PM EDT	Flash Flood Warning	PHI	Berks, Chester	4 hr
Aug 31, 5:13 PM EDT	Areal Flood Warning	PHI	Berks	7 hr
Aug 31, 1:37 AM EDT	Special Weather Statement	PHI	Sussex	53 min
Aug 31, 11:31 AM EDT	Flash Flood Warning	PHI	Kent	11 hr
Aug 31, 11:53 AM EDT	Special Weather Statement	PHI	Kent	37 min
Aug 31, 12:00 PM EDT	Severe Thunderstorm Warning	PHI	Kent	15 min
Aug 31, 12:15 PM EDT	Flash Flood Warning	PHI	Kent, Sussex	7 hr
Aug 31, 12:28 PM EDT	Special Weather Statement	PHI	Kent	32 min
Aug 31, 12:35 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	40 min
Aug 31, 12:54 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 31, 1:09 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	51 min
Aug 31, 1:58 PM EDT	Special Weather Statement	PHI	Sussex	32 min
Aug 31, 4:27 PM EDT	Special Weather Statement	PHI	Sussex	18 min
Aug 31, 4:32 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Aug 31, 4:41 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	4 hr
Aug 31, 4:42 PM EDT	Special Weather Statement	PHI	Sussex	33 min
Aug 31, 5:00 PM EDT	Flash Flood Warning	PHI	New Castle	4 hr
Aug 31, 5:14 PM EDT	Special Weather Statement	PHI	Sussex	46 min
Aug 31, 5:38 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	4 hr
Aug 31, 5:48 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Aug 31, 7:11 PM EDT	Areal Flood Warning	PHI	Kent, Sussex	4 hr
Aug 31, 7:37 PM EDT	Flash Flood Warning	PHI	Kent, New Castle	4 hr

Nearby

Areal Flood Advisories in Delaware, 2018 Every areal flood advisory in 2018

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.