Alert archive / Maryland / Flash Flood Warnings in 2017

Flash Flood Warning 15, NWS Philadelphia/Mount Holly

July 14, 2017Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 14, 2017, 3:52 PM EDT for Talbot County, Maryland. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 14, 2017, 3:52 PM EDT (19:52 UTC)
Expired
Jul 14, 2017, 4:45 PM EDT
In force
53 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Talbot County, MD

The radar

The Dover AFB radar (KDOX), 66 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.9 hours before the alert went out and 104 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, Washington/Dulle, VA at 12:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 403 joules per kilogram.LCLLFCEL10008507005003002001001 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, Washington/Dulle, VA at 12:00Z on 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.193958Sfc1 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
403 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
1367 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

277 
WGUS51 KPHI 141952
FFWPHI
MDC041-142045-
/O.NEW.KPHI.FF.W.0015.170714T1952Z-170714T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
352 PM EDT FRI JUL 14 2017

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northwestern Talbot County in eastern Maryland...

* Until 445 PM EDT

* At 351 PM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is expected due 
  to rainfall rates up to 2 inches per hour.

* Some locations that will experience flooding include...
  Easton, Talbot, St. Michaels, Skipton, Copperville and Cordova. 

LAT...LON 3882 7631 3885 7627 3880 7621 3879 7622
      3879 7620 3886 7620 3888 7615 3888 7610
      3892 7612 3894 7610 3893 7601 3874 7602
      3876 7630 3878 7629 3876 7632 3876 7634

$$

jjm
1 follow-up statement
167 
WGUS71 KPHI 142035
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
435 PM EDT FRI JUL 14 2017

MDC041-142045-
/O.EXP.KPHI.FF.W.0015.000000T0000Z-170714T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Talbot MD-
435 PM EDT FRI JUL 14 2017

...THE FLASH FLOOD WARNING FOR NORTHWESTERN TALBOT COUNTY WILL EXPIRE
AT 445 PM EDT...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 3882 7631 3885 7627 3880 7621 3879 7622
      3879 7620 3886 7620 3888 7615 3888 7610
      3892 7612 3894 7610 3893 7601 3874 7602
      3876 7630 3878 7629 3876 7632 3876 7634

$$

jjm

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 10:03 PM EDTSpecial Weather StatementPHICaroline27 min
Jul 13, 10:15 PM EDTAreal Flood AdvisoryPHICaroline, Talbot4 hr
Jul 14, 9:23 AM EDTSpecial Weather StatementPHICecil37 min
Jul 14, 11:40 AM EDTFlash Flood WatchPHICecil, Kent, Queen Anne's11 hr
Jul 14, 12:06 PM EDTHeat AdvisoryPHICaroline, Kent, Queen Anne's, Talbot7 hr
Jul 14, 2:31 PM EDTSevere Thunderstorm WarningPHICecil59 min
Jul 14, 2:46 PM EDTAreal Flood AdvisoryPHICecil3 hr
Jul 14, 3:10 PM EDTFlash Flood WarningPHICecil2 hr
Jul 14, 3:18 PM EDTSevere Thunderstorm WarningPHICecil12 min
Jul 14, 3:23 PM EDTSevere Thunderstorm WarningPHICecil67 min
Jul 14, 3:57 PM EDTFlash Flood WarningPHICecil, Kent2 hr
Jul 14, 4:00 PM EDTSpecial Weather StatementPHICaroline45 min
Jul 14, 4:05 PM EDTSpecial Weather StatementPHIKent40 min
Jul 14, 4:48 PM EDTSpecial Weather StatementPHIQueen Anne's27 min
Jul 14, 4:59 PM EDTFlash Flood WarningPHIQueen Anne's4 hr
Jul 14, 5:27 PM EDTSpecial Weather StatementPHIQueen Anne's63 min
Jul 14, 5:40 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot65 min
Jul 14, 5:54 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot51 min
Jul 14, 5:58 PM EDTFlash Flood WarningPHITalbot3 hr
Jul 14, 6:10 PM EDTFlash Flood WarningPHICaroline3 hr
Jul 14, 6:20 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot40 min

Nearby

Flash Flood Warnings in Maryland, 2017Every flash flood warning in 2017

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.