Alert archive / Virginia / Flash Flood Warnings in 2018

Flash Flood Warning 28, NWS Baltimore/Washington

May 31, 2018Augusta County, City of Waynesboro, Virginia

NWS Baltimore/Washington issued this flash flood warning at May 31, 2018, 2:35 AM EDT for Augusta County, City of Waynesboro, Virginia. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 31, 2018, 2:35 AM EDT (06:35 UTC)
Expired: May 31, 2018, 5:30 AM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

Counties Augusta County, VA, City of Waynesboro, VA

The radar

The Sterling radar (KLWX), 163 km from the middle of the area, began a volume at 06:38 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

Roanoke, VA (KRNK), launched 00:00Z, 6.6 hours before the alert went out and 111 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: 323 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 75 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 flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this flash flood warning went out at May 30, 10:04 PM EDT, 4 hours 31 minutes earlier.

Area forecast discussion, May 30, 10:04 PM EDT, 4 hours 31 minutes before

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Hazardous weather outlook, May 30, 10:54 PM EDT, 3 hours 41 minutes before

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In the hours before

Local storm report, May 31, 2:13 AM EDT, 22 minutes before

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Local storm report, May 31, 2:17 AM EDT, 18 minutes before

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Local storm report, May 31, 2:20 AM EDT, 15 minutes before

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Local storm report, May 31, 2:23 AM EDT, 12 minutes before

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Local storm report, May 31, 2:28 AM EDT, 7 minutes before

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Local storm report, May 31, 2:30 AM EDT, 5 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 8:35 PM EDT	Flash Flood Warning	LWX	Albemarle	3 hr
May 30, 10:55 PM EDT	Flash Flood Warning	LWX	Albemarle, Greene, Madison	9 hr
May 30, 10:58 PM EDT	Areal Flood Warning	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	6 hr
May 31, 3:22 AM EDT	Flash Flood Warning	LWX	Culpeper, Madison, Orange	6 hr
May 31, 4:06 AM EDT	Flash Flood Watch	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 13 more	17 hr
May 31, 4:43 AM EDT	Areal Flood Warning	LWX	Culpeper, Greene, Madison, Orange	15 hr
May 31, 5:05 AM EDT	Areal Flood Warning	LWX	Augusta, Rockingham, City of Waynesboro	6 hr
May 31, 7:38 AM EDT	River Flood Warning	LWX	Culpeper, Orange, Spotsylvania	26 hr
May 31, 9:37 AM EDT	Areal Flood Warning	LWX	Culpeper	4 hr
May 31, 11:00 AM EDT	Areal Flood Warning	LWX	Augusta, Rockingham	2 hr
May 31, 4:44 PM EDT	Areal Flood Warning	LWX	Clarke, Fauquier, Loudoun, Prince William, Warren	2 hr
May 31, 5:16 PM EDT	Flash Flood Warning	LWX	Fauquier, Loudoun	92 min
May 31, 5:28 PM EDT	Special Marine Warning	LWX		92 min
May 31, 5:51 PM EDT	Special Marine Warning	LWX		84 min
May 31, 6:08 PM EDT	Special Marine Warning	LWX		112 min
May 31, 6:20 PM EDT	Areal Flood Warning	LWX	Fairfax, City of Fairfax	115 min
May 31, 6:42 PM EDT	Flash Flood Warning	LWX	Rockingham, City of Harrisonburg	3 hr
May 31, 6:52 PM EDT	Flash Flood Warning	LWX	Nelson	30 min
May 31, 6:52 PM EDT	Flash Flood Warning	LWX	Albemarle, Greene	92 min
May 31, 7:01 PM EDT	Flash Flood Warning	LWX	Greene, Madison	90 min
May 31, 7:12 PM EDT	Special Marine Warning	LWX		48 min
May 31, 7:39 PM EDT	Special Marine Warning	LWX		51 min
May 31, 7:45 PM EDT	Areal Flood Warning	LWX	Culpeper, Greene, Madison, Orange	7 hr
May 31, 7:50 PM EDT	Areal Flood Warning	LWX	Fairfax, Prince William	115 min
May 31, 7:58 PM EDT	Special Marine Warning	LWX		2 hr
May 31, 4:10 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Washington	50 min
May 31, 5:12 PM EDT	Flash Flood Warning	LWX	Frederick, Washington	97 min
May 31, 6:15 PM EDT	Special Weather Statement	LWX	Howard	75 min
May 31, 6:37 PM EDT	Flash Flood Warning	LWX	Baltimore, Howard, City of Baltimore	2 hr
May 31, 7:29 PM EDT	Areal Flood Warning	LWX	Howard	2 hr

Nearby

Flash Flood Warnings in Virginia, 2018 Every flash flood warning 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.