Alert archive / Maryland / Areal Flood Advisories in 2015

Areal Flood Advisory 29, NWS Philadelphia/Mount Holly

May 29, 20154 counties in Maryland

NWS Philadelphia/Mount Holly issued this areal flood advisory at May 29, 2015, 4:08 PM EDT for 4 counties in Maryland. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
May 29, 2015, 4:08 PM EDT (20:08 UTC)
Expired
May 29, 2015, 7:15 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Caroline County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 55 km from the middle of the area, began a volume at 20:11 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, 8.1 hours before the alert went out and 129 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2015-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2015-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1006 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 12:01 AM EDTAreal Flood AdvisoryPHIKent5 hr
May 29, 12:48 AM EDTAreal Flood AdvisoryPHIQueen Anne's5 hr
May 29, 1:02 AM EDTAreal Flood AdvisoryPHIQueen Anne's3 hr
May 29, 1:37 AM EDTAreal Flood AdvisoryPHIKent, Queen Anne's3 hr
May 29, 2:44 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot3 hr
May 29, 2:55 AM EDTAreal Flood AdvisoryPHIQueen Anne's, Talbot3 hr
May 29, 4:01 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot3 hr
May 29, 2:58 PM EDTAreal Flood AdvisoryPHICaroline3 hr
May 29, 3:34 PM EDTAreal Flood AdvisoryPHICaroline, Talbot3 hr

Nearby

Areal Flood Advisories in Maryland, 2015Every areal flood advisory 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.