Alert archive / Delaware / Areal Flood Advisories in 2013

Areal Flood Advisory 104, NWS Philadelphia/Mount Holly

July 12, 2013Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 12, 2013, 12:15 PM EDT for Kent County, New Castle County, Delaware. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jul 12, 2013, 12:15 PM EDT (16:15 UTC)
Expired: Jul 13, 2013, 1:53 AM EDT
In force: 14 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 16:17 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 4.3 hours before the alert went out and 163 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 892 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -59 m²/s²
0-3 km storm-relative helicity: 194 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 Jul 12, 9:34 AM EDT, 2 hours 41 minutes earlier.

Area forecast discussion, Jul 12, 9:34 AM EDT, 2 hours 41 minutes before

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Hazardous weather outlook, Jul 12, 11:04 AM EDT, 1 hour 11 minutes before

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In the hours before

Local storm report, Jul 12, 6:57 AM EDT, 5 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
657 AM EDT FRI JUL 12 2013

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

0545 AM     FLASH FLOOD      STEVENSVILLE            38.98N  76.31W
07/12/2013                   QUEEN ANNE'S       MD   911 CALL CENTER

            FLOODING ALONG ROUTE 8 JUST SOUTH OF STEVENSVILLE...
            FROM BATTS NECK ROAD SOUTHWARD... WITH ABOUT 4 INCHES OF
            WATER COVERING THE ROAD.

&&

EVENT NUMBER PHI1300262

KLINE

Special weather statement, Jul 12, 8:17 AM EDT, 3 hours 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
817 AM EDT FRI JUL 12 2013

MDZ012-015-019-121300-
KENT MD-QUEEN ANNE'S MD-TALBOT MD-
817 AM EDT FRI JUL 12 2013

...STRONG THUNDERSTORMS WILL AFFECT NORTHERN TALBOT...SOUTHWESTERN
KENT AND WESTERN QUEEN ANNE'S COUNTIES...

AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF KENT...QUEEN
ANNE'S AND TALBOT COUNTIES AT 815 AM EDT. THE STRONG THUNDERSTORMS
WERE GENERALLY MOVING WEST AT 30 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS.
VERY HEAVY RAIN WILL FALL FROM THESE STRONG THUNDERSTORMS...AND WILL
CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN
CAN CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS.

LAT...LON 3887 7626 3881 7621 3882 7620 3894 7624
      3890 7624 3893 7628 3889 7627 3891 7632
      3883 7638 3904 7632 3905 7631 3899 7627
      3900 7618 3903 7625 3918 7628 3924 7612
      3895 7594 3888 7594 3874 7637 3876 7639

MEOLA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:45 AM EDT	Small Craft Advisory	PHI		25 hr
Jul 12, 4:08 AM EDT	Flash Flood Watch	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	17 hr
Jul 12, 2:29 PM EDT	Areal Flood Advisory	PHI	Cape May	6 hr
Jul 12, 4:00 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland, Salem	7 hr
Jul 12, 4:04 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 2 more	4 hr
Jul 12, 4:23 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Somerset	4 hr
Jul 12, 4:47 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	4 hr
Jul 12, 5:54 PM EDT	Special Weather Statement	PHI	Atlantic, Camden	66 min
Jul 12, 6:54 PM EDT	Special Weather Statement	PHI	Atlantic, Camden	66 min
Jul 12, 7:57 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Ocean	63 min
Jul 12, 9:13 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery	4 hr
Jul 12, 10:01 AM EDT	Flash Flood Warning	PHI	Delaware	4 hr
Jul 12, 10:49 AM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Jul 12, 7:21 AM EDT	Areal Flood Advisory	PHI	Sussex	10 hr
Jul 12, 9:20 AM EDT	Areal Flood Advisory	PHI	Kent, Sussex	8 hr
Jul 12, 1:18 PM EDT	Flash Flood Warning	PHI	Kent	4 hr
Jul 12, 1:24 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Jul 12, 1:33 PM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Jul 12, 5:18 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr

Nearby

Areal Flood Advisories in Delaware, 2013 Every areal flood advisory in 2013

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.