Alert archive / New Hampshire / Tornado Warnings in 1999

Tornado Warning 1, NWS Gray, ME

July 24, 1999Rockingham County, New Hampshire

NWS Gray, ME issued this tornado warning at Jul 24, 1999, 3:50 PM EDT for Rockingham County, New Hampshire. It was in force for 30 min. 4 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
Jul 24, 1999, 3:50 PM EDT (19:50 UTC)
Expired
Jul 24, 1999, 4:20 PM EDT
In force
30 min
Issued by
NWS Gray, ME
Area
Whole counties

County Rockingham County, NH

What was reported inside it

TimeReportWhereRemark
Jul 24, 3:54 PM EDTThunderstorm Wind 55Candia, NH
Jul 24, 3:54 PM EDTThunderstorm Wind 55Deerfield, NH
Jul 24, 4:20 PM EDTHail 1Sandown, NH
Jul 24, 4:20 PM EDTThunderstorm Wind 70Sandown, 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.

IssuedProductOfficeLasted
Jul 24, 3:15 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 7.8 hours before the alert went out and 173 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, Chatham, MA at 12:00Z on 1999-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 169 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 1999-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
169 J/kg
Mixed-layer CIN
-158 J/kg
Mixed-layer LCL
1403 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
86 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 3:15 PM EDTSevere Thunderstorm WarningGYXMerrimack50 min
Jul 24, 3:32 PM EDTSevere Thunderstorm WarningGYXRockingham48 min
Jul 24, 4:16 PM EDTSevere Thunderstorm WarningGYXRockingham24 min

Nearby

Tornado Warnings in New Hampshire, 1999Every tornado warning in 1999Tornadoes in 1999

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.