Alert archive / Maryland / Flash Flood Warnings in 2022

Flash Flood Warning 73, NWS Baltimore/Washington

August 22, 2022Baltimore County, Harford County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Aug 22, 2022, 5:54 PM EDT for Baltimore County, Harford County, Maryland. It was in force for 102 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 22, 2022, 5:54 PM EDT (21:54 UTC)
Expired: Aug 22, 2022, 7:36 PM EDT
In force: 102 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

Counties Baltimore County, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 105 km from the middle of the area, began a volume at 21:58 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 12:00Z, 9.9 hours before the alert went out and 196 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: 569 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 745 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 Aug 22, 2:21 PM EDT, 3 hours 33 minutes earlier.

Area forecast discussion, Aug 22, 2:21 PM EDT, 3 hours 33 minutes before

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Hazardous weather outlook, Aug 22, 4:48 PM EDT, 1 hour 6 minutes before

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In the hours before

Local storm report, Aug 22, 12:18 PM EDT, 5 hours 36 minutes before

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Local storm report, Aug 22, 5:34 PM EDT, 20 minutes before

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Local storm report, Aug 22, 5:45 PM EDT, 9 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
Aug 21, 9:18 PM EDT	Small Craft Advisory	LWX		4 hr
Aug 22, 6:16 AM EDT	Dense Fog Advisory	LWX	Greene, Madison, Page, Rappahannock, Rockingham, Shenandoah and 2 more	3 hr
Aug 22, 4:49 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, City of Winchester	26 min
Aug 22, 4:57 PM EDT	Special Marine Warning	LWX		93 min
Aug 22, 5:21 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Madison, Orange	39 min
Aug 21, 8:51 PM EDT	Areal Flood Warning	LWX	Harford	5 hr
Aug 21, 9:12 PM EDT	Areal Flood Warning	LWX	Saint Mary's	3 hr
Aug 21, 9:59 PM EDT	Areal Flood Warning	LWX	Calvert, Saint Mary's	6 hr
Aug 21, 10:53 PM EDT	Flash Flood Warning	LWX	Baltimore, Harford	2 hr
Aug 22, 12:55 AM EDT	Areal Flood Warning	LWX	Baltimore, Harford	47 min
Aug 22, 9:22 AM EDT	Areal Flood Warning	LWX	Baltimore, Harford	3 hr
Aug 22, 5:05 PM EDT	Flash Flood Warning	LWX	Baltimore, Harford	2 hr
Aug 22, 7:29 PM EDT	Areal Flood Warning	LWX	Harford	115 min

Nearby

Flash Flood Warnings in Maryland, 2022 Every flash flood warning in 2022

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.