Alert archive / Maryland / Areal Flood Advisories in 2014

Areal Flood Advisory 264, NWS Philadelphia/Mount Holly

May 16, 20145 counties in Maryland

NWS Philadelphia/Mount Holly issued this areal flood advisory at May 16, 2014, 9:41 AM EDT for 5 counties in Maryland. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: May 16, 2014, 9:41 AM EDT (13:41 UTC)
Expired: May 16, 2014, 3:30 PM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 59 km from the middle of the area, began a volume at 13:43 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, 1.7 hours before the alert went out and 120 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: 800 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: -164 m²/s²
0-3 km storm-relative helicity: 66 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 May 16, 8:59 AM EDT, 42 minutes earlier.

Area forecast discussion, May 16, 8:59 AM EDT, 42 minutes before

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Hazardous weather outlook, May 16, 8:04 AM EDT, 1 hour 37 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 8:03 AM EDT	Coastal Flood Advisory	PHI	Burlington, Camden, Gloucester, Salem	10 hr
May 16, 9:56 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	7 hr
May 16, 10:01 AM EDT	Areal Flood Advisory	PHI	Camden, Cumberland, Gloucester, Salem	7 hr
May 16, 2:51 PM EDT	Areal Flood Warning	PHI	Hunterdon, Warren	6 hr
May 16, 12:47 PM EDT	Areal Flood Warning	PHI	Chester, Delaware	6 hr
May 16, 3:12 PM EDT	River Flood Warning	PHI	Chester	4 hr
May 16, 3:18 PM EDT	River Flood Warning	PHI	Delaware	2 hr
May 16, 3:23 PM EDT	Areal Flood Warning	PHI	Bucks, Montgomery, Philadelphia	11 hr
May 16, 3:58 PM EDT	Areal Flood Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	8 hr
May 16, 10:15 AM EDT	Flash Flood Warning	PHI	Queen Anne's, Talbot	4 hr

Nearby

Areal Flood Advisories in Maryland, 2014 Every areal flood advisory in 2014

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.