Alert archive / New Hampshire / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 5, NWS Boston/Norton, MA

May 20, 1998Hillsborough County, New Hampshire

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 20, 1998, 7:34 PM EDT for Hillsborough County, New Hampshire. It was in force for 46 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
May 20, 1998, 7:34 PM EDT (23:34 UTC)
Expired
May 20, 1998, 8:20 PM EDT
In force
46 min
Issued by
NWS Boston/Norton, MA
Area
Whole counties

County Hillsborough County, NH

The radar

The Boston radar (KBOX), 117 km from the middle of the area, began a volume at 23:38 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

Gray, ME (KGYX), launched 12:00Z, 11.6 hours before the alert went out and 160 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, Gray, ME at 12:00Z on 1998-05-20Temperature 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, Gray, ME at 12:00Z on 1998-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
1614 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
107 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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, May 20, 6:24 PM EDT, 1 hour 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MASSACHUSETTS
624 PM EDT WED MAY 20 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0545 PM    GREENFIELD                MA   .75 INCH HAIL
05/20/98   FRANKLIN                       SKYWARN SPOTTER
                                          COORDINATOR

0605 PM    LEVERETT                  MA   .75 INCH HAIL
05/20/98   FRANKLIN                       SKYWARN SPOTTER
Local storm report, May 20, 7:28 PM EDT, 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TAUNTON MASSACHUSETTS
728 PM EDT WED MAY 20 1998

TIME(EDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0545 PM    GREENFIELD                MA   .75 INCH HAIL
05/20/98   FRANKLIN                       SKYWARN SPOTTER
                                          COORDINATOR

0605 PM    LEVERETT                  MA   .75 INCH HAIL
05/20/98   FRANKLIN                       SKYWARN SPOTTER

0625 PM    NORTHFIELD                MA   .75 INCH HAIL
05/20/98   FRANKLIN                       SKYWARN SPOTTER

0715 PM    FITZWILLIAM               NH   .75 INCH HAIL
05/20/98   CHESHIRE                       SKYWARN SPOTTER REPORT

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 6:48 PM EDTSevere Thunderstorm WarningBOXCheshire62 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 1998Every severe thunderstorm warning in 1998

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.