Alert archive / Maine / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 56, NWS Gray, ME

September 4, 2019Franklin County, Oxford County, Maine; Coos County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Sep 4, 2019, 5:01 PM EDT for Franklin County, Oxford County, Maine; Coos County, New Hampshire. It was in force for 59 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
Sep 4, 2019, 5:01 PM EDT (21:01 UTC)
Expired
Sep 4, 2019, 6:00 PM EDT
In force
59 min
Issued by
NWS Gray, ME
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Franklin County, ME, Oxford County, ME, Coos County, NH

The radar

The Portland,ME radar (KGYX), 103 km from the middle of the area, began a volume at 21:02 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

Albany, NY (KALY), launched 12:00Z, 9.0 hours before the alert went out and 330 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, Albany, NY at 12:00Z on 2019-09-04Temperature 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, Albany, NY at 12:00Z on 2019-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 340 square meters per square second.19395878Sfc1 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
1083 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
340 m²/s²
0-3 km storm-relative helicity
378 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 4, 2:37 AM EDTSmall Craft AdvisoryGYX24 hr
Sep 4, 7:33 PM EDTSpecial Weather StatementGYXKennebec42 min
Sep 4, 10:56 AM EDTSpecial Weather StatementGYXCoos34 min
Sep 4, 12:37 PM EDTSpecial Weather StatementGYXSullivan23 min
Sep 4, 12:41 PM EDTSpecial Weather StatementGYXCarroll34 min
Sep 4, 12:58 PM EDTSpecial Weather StatementGYXBelknap, Merrimack32 min
Sep 4, 1:26 PM EDTSpecial Weather StatementGYXBelknap34 min
Sep 4, 2:40 PM EDTSpecial Weather StatementGYXCheshire35 min
Sep 4, 3:07 PM EDTSpecial Weather StatementGYXMerrimack23 min
Sep 4, 4:54 PM EDTSpecial Weather StatementGYXCoos51 min
Sep 4, 10:30 AM EDTSpecial Weather StatementGYXCaledonia30 min
Sep 4, 1:46 PM EDTSpecial Weather StatementGYXWindsor29 min

Nearby

Severe Thunderstorm Warnings in Maine, 2019Severe Thunderstorm Warnings in New Hampshire, 2019Every severe thunderstorm warning in 2019

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.