Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 6, NWS Gray, ME

June 20, 2001Merrimack County, Rockingham County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jun 20, 2001, 3:36 PM EDT for Merrimack County, Rockingham County, New Hampshire. It was in force for 54 min. 5 reports 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: Jun 20, 2001, 3:36 PM EDT (19:36 UTC)
Expired: Jun 20, 2001, 4:30 PM EDT
In force: 54 min
Issued by: NWS Gray, ME
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Merrimack County, NH, Rockingham County, NH

The radar

The Portland,ME radar (KGYX), 123 km from the middle of the area, began a volume at 19:36 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.

What was reported inside it

Time	Report	Where
Jun 20, 3:51 PM EDT	Hail 1.4	Henniker, NH
Jun 20, 4:06 PM EDT	Hail 1	Bow Center, NH
Jun 20, 4:16 PM EDT	Hail 1	Hooksett, NH
Jun 20, 4:20 PM EDT	Hail 1	Suncook, NH
Jun 20, 4:24 PM EDT	Hail 1	Allenstown, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 20, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 7.6 hours before the alert went out and 123 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 425 J/kg
Mixed-layer CIN: -223 J/kg
Mixed-layer LCL: 1502 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -84 m²/s²
0-3 km storm-relative helicity: -36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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.

NWS Gray, ME wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 2:29 PM EDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jun 20, 2:29 PM EDT, 1 hour 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
229 PM EDT WED JUN 20 2001

DISC...BEST CHC FOR SIGNIF CONVECTION SHIFTING S ACRS SWRNMST
ME/NH.  N OF THS RGN...WNDS HV SHIFTED TO THE NW...STABILIZING ATMOS
SOMEWHAT AND LOWERING SHEAR PROFILES.  CAPES AOA 1500 J/KG ACRS
SRNMST PTN OF THE RGN W/ TDS IN THE 60S.  ADDED LOW LVL ASCENT FM
SLO MOVG COLD FNTL BNDRY WL AID ON DVLPMNT OF CONVECTION.  AS PER
SPC DISC...ISOLD GUSTY WNDS/HAIL PSBL LT THS AFTN.  SPC ABT TO ISSUE
BOX FOR ISOLD SVR STMS.  WL ALSO ADD PSBL GUSTY WNDS AND HAIL TO
SRNMST ZNS.

MDLS DRIVING CDFNT THS EVE SLGTLY FURTHER S ON THE RUN.  THS HAS BN
THE GENERAL TREND OVR THE LAST FEW DAYS.  XPCT TREND OF MDLS
ATTEMPTING TO DRIVE SFC RIDGE TO OUR NE INTO MUCH OF FA TO CONT.  WL
BE OPTIMISTIC AND LV MEASURABLE PCPN OUT OF ZNS AFT MDNGT TNGT...EVN
SRN ZNS.  PSBL SPRINKLES THU S AS MOISTR STALLS ACRS SRNMST NH
SRNMST ME.  WL DO SPLITS ACCORDINGLY.

CHC TYPE POPS ALL THE WAY THRU EARLY MON AS SRLY...MOIST FLO CONTS.
LKLY POPS XPCTD FRI.

MARINE...WNDS MAY PICK UP FRI IN PERSISTENT SRLY FLO.

FCSTID = 13

.GYX...ME...SVR TSTM WATCH TIL 01Z MEZ-018/019/023/024 &
       ADJCNT CSTL WATERS.
       NH...SVR TSTM WATCH TIL 01Z NHZ-007>010/013/014 &
       ADJCNT CSTL WATERS.

JC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 3:42 PM EDT	Severe Thunderstorm Warning	GYX	Lincoln	63 min
Jun 20, 4:57 PM EDT	Severe Thunderstorm Warning	GYX	York	63 min
Jun 20, 4:12 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	48 min
Jun 20, 4:35 PM EDT	Severe Thunderstorm Warning	GYX	Strafford	55 min
Jun 20, 5:08 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	37 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2001 Every severe thunderstorm warning in 2001

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; radar from the NEXRAD Level II archive.