Alert archive / Maryland / Flash Flood Warnings in 2015

Flash Flood Warning 27, NWS Baltimore/Washington

June 30, 2015Harford County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 30, 2015, 3:51 PM EDT for Harford County, Maryland. It was in force for 114 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: Jun 30, 2015, 3:51 PM EDT (19:51 UTC)
Expired: Jun 30, 2015, 5:45 PM EDT
In force: 114 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

County Harford County, MD

The radar

The Dover AFB radar (KDOX), 108 km from the middle of the area, began a volume at 19:52 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.9 hours before the alert went out and 19 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: 600 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.9

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 Jun 30, 3:27 PM EDT, 24 minutes earlier.

Area forecast discussion, Jun 30, 3:27 PM EDT, 24 minutes before

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Hazardous weather outlook, Jun 30, 2:37 PM EDT, 1 hour 14 minutes before

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In the hours before

Local storm report, Jun 30, 2:06 PM EDT, 1 hour 45 minutes before

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Local storm report, Jun 30, 2:53 PM EDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
253 PM EDT TUE JUN 30 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0114 PM     TSTM WND DMG     1 SE WHITEFORD          39.70N  76.33W
06/30/2015                   HARFORD            MD   TRAINED SPOTTER

            TREES DOWN NEAR RIDGE ROAD AND WHITEFORD RD

&&

EVENT NUMBER LWX1500642

MSE

Local storm report, Jun 30, 3:02 PM EDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
302 PM EDT TUE JUN 30 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0230 PM     MARINE TSTM WIND 1 E HAVRE DE GRACE      39.54N  76.08W
06/30/2015  M47 MPH          ANZ530             MD   BUOY

&&

EVENT NUMBER LWX1500643

SMZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 1:17 PM EDT	Special Marine Warning	LWX		88 min
Jun 30, 1:25 PM EDT	Special Marine Warning	LWX		95 min
Jun 30, 2:40 PM EDT	Special Marine Warning	LWX		2 hr
Jun 30, 4:15 PM EDT	Special Marine Warning	LWX		2 hr
Jun 30, 4:43 PM EDT	Special Marine Warning	LWX		92 min
Jun 30, 5:01 PM EDT	Special Marine Warning	LWX		89 min
Jun 30, 12:57 PM EDT	Severe Thunderstorm Warning	LWX	Harford	33 min
Jun 30, 2:15 PM EDT	Severe Thunderstorm Warning	LWX	Harford	34 min
Jun 30, 3:14 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Harford	46 min
Jun 30, 4:26 PM EDT	Severe Thunderstorm Warning	LWX	Calvert	19 min

Nearby

Flash Flood Warnings in Maryland, 2015 Every flash flood warning in 2015

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.