Alert archive / Maryland / Flash Flood Watches in 2016

Flash Flood Watch 2, NWS Baltimore/Washington

May 29, 2016King George County, Virginia; 5 counties in Maryland

NWS Baltimore/Washington issued this flash flood watch at May 29, 2016, 5:44 PM EDT for King George County, Virginia; 5 counties in Maryland. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: May 29, 2016, 5:44 PM EDT (21:44 UTC)
Expired: May 30, 2016, 1:27 AM EDT
In force: 8 hr
Issued by: NWS Baltimore/Washington
Flood severity: None

Counties Anne Arundel County, MD, Baltimore County, MD, Charles County, MD, City of Baltimore, MD, Prince George's County, MD, King George County, VA

The radar

The Sterling radar (KLWX), 60 km from the middle of the area, began a volume at 21:43 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, 9.7 hours before the alert went out and 52 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: 1418 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 15 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 watch 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 watch went out at May 29, 2:29 PM EDT, 3 hours 15 minutes earlier.

Area forecast discussion, May 29, 2:29 PM EDT, 3 hours 15 minutes before

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Hazardous weather outlook, May 29, 5:10 AM EDT, 12 hours 34 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 29, 4:52 PM EDT	Flash Flood Warning	LWX	King George	3 hr

Nearby

Flash Flood Watches in Maryland, 2016 Flash Flood Watches in Virginia, 2016 Every flash flood watch in 2016

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.