Alert archive / New Hampshire / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 2, NWS Gray, ME

May 17, 1991Merrimack County, Rockingham County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at May 17, 1991, 5:35 PM EDT for Merrimack County, Rockingham County, New Hampshire. It was in force for 55 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 17, 1991, 5:35 PM EDT (21:35 UTC)
Expired
May 17, 1991, 6:30 PM EDT
In force
55 min
Issued by
NWS Gray, ME
Area
Whole counties

Counties Merrimack County, NH, Rockingham County, NH

What was reported inside it

TimeReportWhereRemark
May 17, 5:45 PM EDTThunderstorm Wind 0Merrimack, NH

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Albany, NY (KALB), launched 12:00Z, 9.6 hours before the alert went out and 205 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 1991-05-17Temperature 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 1991-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1472 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 6:05 PM EDTSevere Thunderstorm WarningGYXYork55 min
May 17, 5:25 PM EDTSevere Thunderstorm WarningGYXCheshire, Hillsborough65 min
May 17, 6:14 PM EDTSevere Thunderstorm WarningGYXStrafford46 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 1991Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.