Alert archive / Delaware / Areal Flood Advisories in 2018

Areal Flood Advisory 52, NWS Philadelphia/Mount Holly

May 15, 2018Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this areal flood advisory at May 15, 2018, 8:43 PM EDT for Kent County, Sussex County, Delaware. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: May 15, 2018, 8:43 PM EDT (00:43 UTC)
Expired: May 16, 2018, 12:45 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, Sussex County, DE

The radar

The Dover AFB radar (KDOX), 7 km from the middle of the area, began a volume at 00:45 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 00:00Z, 0.7 hours before the alert went out and 107 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: 653 J/kg
Mixed-layer CIN: -189 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 148 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 15, 8:06 PM EDT, 37 minutes earlier.

Area forecast discussion, May 15, 8:06 PM EDT, 37 minutes before

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Hazardous weather outlook, May 15, 7:55 PM EDT, 48 minutes before

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In the hours before

Special weather statement, May 15, 8:13 PM EDT, 30 minutes before

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Local storm report, May 15, 8:19 PM EDT, 24 minutes before

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Local storm report, May 15, 8:22 PM EDT, 21 minutes before

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Local storm report, May 15, 8:28 PM EDT, 15 minutes before

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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, May 15, 8:33 PM EDT, 10 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, May 15, 8:39 PM EDT, 4 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 15, 8:43 PM EDT	Special Marine Warning	PHI		92 min
May 16, 3:35 PM EDT	Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more	3 days
May 15, 10:01 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
May 15, 10:54 PM EDT	Special Weather Statement	PHI	Sussex	66 min

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.