Alert archive / Maryland / Heat Advisories in 2017

Heat Advisory 3, NWS Philadelphia/Mount Holly

July 14, 20174 counties in Maryland; Kent County, Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this heat advisory at Jul 14, 2017, 12:06 PM EDT for 4 counties in Maryland; Kent County, Sussex County, Delaware. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Jul 14, 2017, 12:06 PM EDT (16:06 UTC)
Expired
Jul 14, 2017, 6:42 PM EDT
In force
7 hr
Issued by
NWS Philadelphia/Mount Holly

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

The radar

The Dover AFB radar (KDOX), 37 km from the middle of the area, began a volume at 16:07 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, 4.1 hours before the alert went out and 119 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 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 908 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
908 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
959 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

752 
WWUS71 KPHI 141606
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
1206 PM EDT Fri Jul 14 2017

DEZ002-003-MDZ012-015-019-020-150000-
/O.NEW.KPHI.HT.Y.0003.170714T1606Z-170715T0000Z/
Kent-Inland Sussex-Kent MD-Queen Annes-Talbot-Caroline-
Including the cities of Dover, Georgetown, Chestertown, 
Centreville, Easton, and Denton
1206 PM EDT Fri Jul 14 2017

...HEAT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

The National Weather Service in Mount Holly has issued a Heat
Advisory, which is in effect until 8 PM EDT this evening.

* HEAT INDEX VALUES...Maximum values between 103 and 107 degrees
  due to temperatures in the lower to middle 90s and dew points 
  in the middle to upper 70s.

* TIMING...This afternoon. 

* IMPACTS...The heat and humidity may cause heat stress during 
  outdoor exertion or extended exposure.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Heat Advisory means that a period of hot temperatures is
expected. The combination of hot temperatures and high humidity
will combine to create a situation in which heat illnesses are
possible. Drink plenty of fluids...stay in an air-conditioned
room...stay out of the sun...and check up on relatives and
neighbors.

Take extra precautions...if you work or spend time outside. When 
possible...reschedule strenuous activities to early morning or 
evening. Know the signs and symptoms of heat exhaustion and heat 
stroke. Wear light weight and loose fitting clothing when possible
and drink plenty of water.

To reduce risk during outdoor work...the occupational safety and 
health administration recommends scheduling frequent rest breaks 
in shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an 
emergency...call 9 1 1.

&&

$$
JRK
2 follow-up statements
887 
WWUS71 KPHI 142149
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
549 PM EDT Fri Jul 14 2017

DEZ002-MDZ012-015-142300-
/O.CAN.KPHI.HT.Y.0003.000000T0000Z-170715T0000Z/
Kent-Kent MD-Queen Annes-
Including the cities of Dover, Chestertown, and Centreville
549 PM EDT Fri Jul 14 2017

...HEAT ADVISORY IS CANCELLED...

The National Weather Service in Mount Holly has cancelled the
Heat Advisory.

The arrival of cooler air from the storms moving into the area
late this afternoon has put an end to the excessive heat.


$$

DEZ003-MDZ019-020-150000-
/O.CON.KPHI.HT.Y.0003.000000T0000Z-170715T0000Z/
Inland Sussex-Talbot-Caroline-
Including the cities of Georgetown, Easton, and Denton
549 PM EDT Fri Jul 14 2017

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* HEAT INDEX VALUES...Maximum values between 103 and 107 degrees
  due to temperatures around 90 degrees and dew points in the upper
  70s to near 80 degrees.

* TIMING....The arrival of cooler air from the storms that are
  approaching from the north will mark the end of excessive heat
  early this evening.

* IMPACTS...The heat and humidity may cause heat stress during 
  outdoor exertion or extended exposure.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Heat Advisory means that a period of hot temperatures is
expected. The combination of hot temperatures and high humidity
will combine to create a situation in which heat illnesses are
possible. Drink plenty of fluids...stay in an air-conditioned
room...stay out of the sun...and check up on relatives and
neighbors.

Take extra precautions...if you work or spend time outside. When
possible...reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work...the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency...call 9 1 1.

&&

$$
JRK
289 
WWUS71 KPHI 142242
NPWPHI

URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
642 PM EDT Fri Jul 14 2017


DEZ003-MDZ019-020-142345-
/O.CAN.KPHI.HT.Y.0003.000000T0000Z-170715T0000Z/
Inland Sussex-Talbot-Caroline-
Including the cities of Georgetown, Easton, and Denton
642 PM EDT Fri Jul 14 2017

...HEAT ADVISORY IS CANCELLED...

The National Weather Service in Mount Holly has cancelled the
Heat Advisory.

After heat indicies topped out around 105 degrees today, rain 
cooled air has arrived. So the relief from todays earlier heat 
has started.

$$

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, 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, 3:52 PM EDTFlash Flood WarningPHITalbot53 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
Jul 13, 8:09 PM EDTSpecial Weather StatementPHIKent36 min
Jul 13, 8:29 PM EDTSpecial Weather StatementPHIKent31 min
Jul 13, 10:39 PM EDTSevere Thunderstorm WarningPHISussex51 min
Jul 14, 9:02 AM EDTSpecial Weather StatementPHINew Castle28 min
Jul 14, 2:14 PM EDTAreal Flood AdvisoryPHINew Castle3 hr
Jul 14, 2:53 PM EDTFlash Flood WarningPHINew Castle3 hr
Jul 14, 3:25 PM EDTAreal Flood AdvisoryPHINew Castle4 hr
Jul 14, 3:34 PM EDTFlash Flood WarningPHINew Castle3 hr
Jul 14, 3:54 PM EDTSevere Thunderstorm WarningPHIKent, New Castle66 min
Jul 14, 5:14 PM EDTAreal Flood AdvisoryPHIKent3 hr
Jul 14, 5:24 PM EDTSpecial Weather StatementPHISussex36 min
Jul 14, 5:30 PM EDTRiver Flood WarningPHINew Castle7 hr
Jul 14, 5:51 PM EDTSpecial Weather StatementPHISussex39 min
Jul 14, 6:32 PM EDTAreal Flood AdvisoryPHISussex4 hr
Jul 14, 6:48 PM EDTSpecial Weather StatementPHISussex42 min
Jul 14, 7:15 PM EDTSevere Thunderstorm WarningPHISussex60 min

Nearby

Heat Advisories in Maryland, 2017Heat Advisories in Delaware, 2017Every heat advisory 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.