Alert archive / North Carolina / Areal Flood Advisories in 2018

Areal Flood Advisory 21, NWS Raleigh, NC

May 21, 2018Harnett County, Johnston County, Sampson County, North Carolina

NWS Raleigh, NC issued this areal flood advisory at May 21, 2018, 10:49 PM EDT for Harnett County, Johnston County, Sampson County, North Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: May 21, 2018, 10:49 PM EDT (02:49 UTC)
Expired: May 22, 2018, 1:45 AM EDT
In force: 3 hr
Issued by: NWS Raleigh, NC
Area: Storm-based polygon

Counties Harnett County, NC, Johnston County, NC, Sampson County, NC

The radar

The Raleigh/Durham radar (KRAX), 42 km from the middle of the area, began a volume at 02:49 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 2.8 hours before the alert went out and 151 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: 266 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 977 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 28 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 Raleigh, NC wrote its last area forecast discussion before this areal flood advisory went out at May 21, 9:16 PM EDT, 1 hour 33 minutes earlier.

Area forecast discussion, May 21, 9:16 PM EDT, 1 hour 33 minutes before

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Hazardous weather outlook, May 21, 3:56 PM EDT, 6 hours 53 minutes before

Hazardous Weather Outlook
National Weather Service Raleigh NC
356 PM EDT Mon May 21 2018

NCZ083>086-088-222000-
Anson-Richmond-Scotland-Hoke-Cumberland-
356 PM EDT Mon May 21 2018

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ007>011-021>028-038>043-073>078-089-222000-
Person-Granville-Vance-Warren-Halifax-Forsyth-Guilford-Alamance-
Orange-Durham-Franklin-Nash-Edgecombe-Davidson-Randolph-Chatham-Wake-
Johnston-Wilson-Stanly-Montgomery-Moore-Lee-Harnett-Wayne-Sampson-
356 PM EDT Mon May 21 2018

This Hazardous Weather Outlook is for central North Carolina.

.DAY ONE...This Afternoon and Tonight.

Scattered showers and thunderstorms with heavy downpours are
possible this afternoon and evening. If the showers and storms train
across the same location, 1 to 2 inches of rain could occur in less
than a couple of hours, leading to localized flooding of streets and
swollen creeks. Small hail and brief strong wind gusts are also
possible with the stronger storms.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Isolated severe storms are possible on Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

In the hours before

Local storm report, May 21, 8:42 PM EDT, 2 hours 7 minutes before

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Special weather statement, May 21, 9:16 PM EDT, 1 hour 33 minutes before

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Local storm report, May 21, 9:27 PM EDT, 1 hour 22 minutes before

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Special weather statement, May 21, 9:58 PM EDT, 51 minutes before

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Special weather statement, May 21, 10:00 PM EDT, 49 minutes before

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Local storm report, May 21, 10:44 PM EDT, 5 minutes before

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The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 8:09 PM EDT	Areal Flood Advisory	RAH	Durham, Orange	3 hr
May 21, 8:11 PM EDT	Special Weather Statement	RAH	Moore	34 min
May 21, 8:25 PM EDT	Flash Flood Warning	RAH	Durham, Orange	3 hr
May 21, 8:40 PM EDT	Special Weather Statement	RAH	Lee	35 min
May 21, 9:16 PM EDT	Special Weather Statement	RAH	Chatham, Lee	44 min
May 21, 9:58 PM EDT	Special Weather Statement	RAH	Johnston	62 min
May 21, 10:00 PM EDT	Special Weather Statement	RAH	Chatham	60 min
May 21, 11:33 PM EDT	Special Weather Statement	RAH	Wake	57 min
May 22, 6:39 AM EDT	River Flood Warning	RAH	Halifax, Northampton	8 days
May 22, 12:15 PM EDT	River Flood Warning	RAH	Halifax, Northampton	9 days
May 22, 2:42 PM EDT	Special Weather Statement	RAH	Granville, Vance	33 min
May 22, 2:44 PM EDT	Special Weather Statement	RAH	Franklin	31 min
May 22, 3:16 PM EDT	Special Weather Statement	RAH	Warren	59 min
May 22, 3:42 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Halifax, Warren	48 min
May 22, 4:12 PM EDT	Special Weather Statement	RAH	Halifax	63 min

Nearby

Areal Flood Advisories in North Carolina, 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.