Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 112, NWS Gray, ME

July 9, 2007Merrimack County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 9, 2007, 10:22 PM EDT for Merrimack County, New Hampshire. It was in force for 38 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: Jul 9, 2007, 10:22 PM EDT (02:22 UTC)
Expired: Jul 9, 2007, 11:00 PM EDT
In force: 38 min
Issued by: NWS Gray, ME
Area: Counties, with a storm outline in the text

County Merrimack County, NH

The radar

The Portland,ME radar (KGYX), 132 km from the middle of the area, began a volume at 02:24 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 9, 5:48 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 00:00Z, 2.4 hours before the alert went out and 229 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: 16 J/kg
Mixed-layer CIN: -440 J/kg
Mixed-layer LCL: 1489 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Jul 9, 9:32 PM EDT, 50 minutes earlier.

Area forecast discussion, Jul 9, 9:32 PM EDT, 50 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
932 PM EDT MON JUL 9 2007

.SYNOPSIS...
A STRONG WARM FRONT WILL MOVE TO EASTERN MAINE THIS EVENING. LOW
PRESSURE WILL TRACK ACROSS NORTHERN MAINE AND DRAG A WEAK COLD
FRONT ACROSS THE REGION TONIGHT. THAT COLD FRONT WILL LIFT BACK
NORTH ON TUESDAY...ALLOWING WARM AIR TO WORK BACK INTO THE REGION.
A COLD FRONT WILL MOVE EAST ACROSS MAINE AND NEW HAMPSHIRE
WEDNESDAY NIGHT AND EARLY THURSDAY. HIGH PRESSURE WILL BUILD OVER
THE REGION THROUGH FRIDAY. LOW PRESSURE WILL MOVE ACROSS NORTHERN
MAINE DURING THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
SEVERE THUNDERSTORM WATCH #501 CONTINUES TO BE IN EFFECT TIL 11 PM
FOR MUCH OF NEW HAMPSHIRE AND YORK COUNTY MAINE. WIDESPREAD SEVERE
WEATHER ACROSS SOUTHERN NEW HAMPSHIRE AS SIGNIFICANT SLANTWISE
CONVECTION CONTINUES. FLOOD WARNING UP AS WELL FOR MERRIMACK COUNTY.

HAVE UPPED THE PROBABILITY OF PRECIPITATION INTO THE LIKELY
CATEGORY. HAVE ADDED FOG TO THE GRIDS.
&&

.SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/...
THE FOG SHOULD LIFT TUESDAY MORNING ALLOWING FOR PARTLY SUNNY
SKIES BY MID MORNING. A WARM AND VERY UNSTABLE AIRMASS WILL BE IN
PLACE WHICH SHOULD ALLOW SCATTERED AFTERNOON THUNDERSTORMS TO
DEVELOP. STRONG THUNDERSTORMS WILL AGAIN BE POSSIBLE MAINLY OVER
THE SOUTHWEST HALF OF THE FORECAST AREA. GFS MOS MAXIMUM
TEMPERATURE GUIDANCE AGAIN WAS REASONABLE FOR THE SITUATION AND
WAS USED FOR TUESDAYS HIGH TEMPERATURE FORECAST OF 80S TO AROUND
90.

&&

.LONG TERM /TUESDAY NIGHT THROUGH MONDAY/...
THE HOT STICKY AIR CONTINUES TUESDAY NIGHT AND WEDNESDAY WITH A
LARGE LOW TO THE NORTHWEST. THE FRONTS WITH THIS LOW WILL SEND
ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS THROUGH THE AREA. HIGH
PRESSURE WILL THEN GIVE US IMPROVING WEATHER FOR THURSDAY AND
REMAINING DRY ON FRIDAY. ANOTHER LOW WILL CROSS SOUTHERN QUEBEC
AND BRING MORE SHOWERS FOR THE WEEKEND.

&&

.AVIATION /02Z TUESDAY THROUGH SATURDAY/...
SHORT TERM...MVFR CONDITIONS IN WIDESPREAD SHOWERS WITH EMBEDDED
THUNDERSTORMS MONDAY AFTERNOON SHOULD DETERIOR TO IFR CONDITIONS
IN STRATUS AND FOG. CONDITIONS SHOULD IMPROVE TO MVRF THEN VFR
AFTER SUNRISE TUESDAY. SCATTERED THUNDERSTORMS COULD AFFECT ALL
AIRPORTS TUESDAY AFTERNOON.

LONG TERM...MVFR CONDITIONS IN HAZE AND PATCHY FOG
TUESDAY NIGHT AND WEDNESDAY. MORE WIDESPREAD MVFR TO IFR
CONDITIONS IN SHOWERS AND THUNDERSTORMS LATE WEDNESDAY.

&&

.MARINE...
SHORT TERM...NO FLAGS. CONVECTION WILL CONTINUE OVER THE SOUTHERN WATERS.

LONG TERM...GUSTY WINDS AHEAD OF THE COLD FRONT LATE WEDNESDAY
COULD REQUIRE SMALL CRAFT ADVISORY.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
NH...NONE.
MARINE...NONE.

&&

Hazardous weather outlook, Jul 9, 6:14 PM EDT, 4 hours 8 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAY ME
614 PM EDT MON JUL 9 2007

ANZ150-170-MEZ007>009-012>014-018>028-NHZ001>010-013-014-102215-
STONINGTON ME TO MERRIMACK RIVER MA OUT TO 25 NM-
WATERS FROM STONINGTON (DEER ISLE) ME TO MERRIMACK RIVER MA FROM
25 TO 40 NM-NORTHERN OXFORD-NORTHERN FRANKLIN-CENTRAL SOMERSET-
SOUTHERN OXFORD-SOUTHERN FRANKLIN-SOUTHERN SOMERSET-INTERIOR YORK-
INTERIOR CUMBERLAND-ANDROSCOGGIN-KENNEBEC-INTERIOR WALDO-
COASTAL YORK-COASTAL CUMBERLAND-SAGADAHOC-LINCOLN-KNOX-
COASTAL WALDO-NORTHERN COOS-SOUTHERN COOS-NORTHERN GRAFTON-
NORTHERN CARROLL-SOUTHERN GRAFTON-SOUTHERN CARROLL-SULLIVAN-
MERRIMACK-BELKNAP-STRAFFORD-INTERIOR ROCKINGHAM-
COASTAL ROCKINGHAM-
614 PM EDT MON JUL 9 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR...WESTERN MAINE...CENTRAL
NEW HAMPSHIRE...NORTHERN NEW HAMPSHIRE...SOUTHEASTERN NEW
HAMPSHIRE AND THE COASTAL WATERS FROM STONINGTON ME TO THE
MERRIMACK RIVER MA.

.DAY ONE...TONIGHT

ISOLATED STORMS MAY CONTAIN DAMAGING WINDS OR LARGE HAIL ACROSS
MOST OF NEW HAMPSHIRE AND YORK COUNTY MAINE THROUGH LATE THIS EVENING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR THIS AREA UNTIL
11 PM.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

SEVERE THUNDERSTORMS ARE POSSIBLE TUESDAY AND WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS AND AMATEUR RADIO OPERATORS ARE ENCOURAGED TO
REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD
OPERATING PROCEDURES.

JC

In the hours before

Special weather statement, Jul 9, 8:02 PM EDT, 2 hours 20 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Jul 9, 8:34 PM EDT, 1 hour 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
834 PM EDT MON JUL 09 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0756 PM     HAIL             HILL                    43.52N 71.70W
07/09/2007  E0.88 INCH       MERRIMACK          NH   PUBLIC

0809 PM     HAIL             LACONIA                 43.24N 71.47W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0805 PM     HAIL             SANBORNTON              43.49N 71.58W
07/09/2007  E0.88 INCH       BELKNAP            NH   PUBLIC

0809 PM     HAIL             LACONIA                 43.24N 71.47W
07/09/2007  E0.75 INCH       MERRIMACK          NH   PUBLIC

0809 PM     HAIL             LACONIA                 43.24N 71.47W
07/09/2007  E0.75 INCH       MERRIMACK          NH   PUBLIC

0815 PM     HAIL             GILFORD                 43.55N 71.41W
07/09/2007  E0.88 INCH       BELKNAP            NH   PUBLIC

0805 PM     HAIL             SANBORNTON              43.49N 71.58W
07/09/2007  E0.88 INCH       BELKNAP            NH   PUBLIC

0805 PM     HAIL             SANBORNTON              43.49N 71.58W
07/09/2007  E0.88 INCH       BELKNAP            NH   PUBLIC

0809 PM     HAIL             LACONIA                 43.24N 71.47W
07/09/2007  E1.25 INCH       MERRIMACK          NH   PUBLIC

&&

DAN M

Local storm report, Jul 9, 8:47 PM EDT, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
847 PM EDT MON JUL 09 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0809 PM     HAIL             LACONIA                 43.24N 71.47W
07/09/2007  E1.00 INCH       MERRIMACK          NH   EMERGENCY MNGR

0830 PM     HAIL             NEW LONDON              43.41N 71.99W
07/09/2007  E0.88 INCH       MERRIMACK          NH   PUBLIC

0830 PM     HAIL             NEW LONDON              43.41N 71.99W
07/09/2007  E0.88 INCH       MERRIMACK          NH   PUBLIC

&&

DAN M

Local storm report, Jul 9, 9:24 PM EDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
924 PM EDT MON JUL 09 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0830 PM     TSTM WND GST     LEBANON                 43.64N 72.25W
07/09/2007  M69 MPH          GRAFTON            NH   PUBLIC

            MEASURED GUSTS TO 67 AND 69 MPH. LARGE LIMBS DOWN.

0830 PM     TSTM WND DMG     SUTTON                  43.33N 71.95W
07/09/2007                   MERRIMACK          NH   LAW ENFORCEMENT

            TREES DOWN PER NEW LONDON POLICE DEPT.

0835 PM     TSTM WND DMG     WILMOT                  43.45N 71.91W
07/09/2007                   MERRIMACK          NH   LAW ENFORCEMENT

            TREES DOWN ON WIRES.

0917 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

&&

DAN M

Local storm report, Jul 9, 9:43 PM EDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
943 PM EDT MON JUL 09 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E0.88 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E0.75 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

&&

DAN M

Local storm report, Jul 9, 10:02 PM EDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAY ME
1002 PM EDT MON JUL 09 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E0.75 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E2.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0912 PM     HAIL             CONCORD                 43.21N 71.54W
07/09/2007  E1.00 INCH       MERRIMACK          NH   PUBLIC

0942 PM     HAIL             DEERFIELD               43.15N 71.22W
07/09/2007  E0.88 INCH       ROCKINGHAM         NH   PUBLIC

&&

DAN M

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 10:59 PM EDT	Special Marine Warning	GYX		61 min
Jul 9, 8:22 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack	38 min
Jul 9, 8:25 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	35 min
Jul 9, 8:49 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	26 min
Jul 9, 9:19 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack	41 min
Jul 9, 9:21 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Rockingham	39 min
Jul 9, 9:59 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Rockingham	46 min
Jul 9, 10:05 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Sullivan	25 min
Jul 9, 10:10 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	35 min
Jul 9, 10:45 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	45 min
Jul 10, 2:41 PM EDT	Severe Thunderstorm Warning	GYX	Grafton, Sullivan	64 min
Jul 10, 3:44 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	46 min
Jul 10, 6:35 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	25 min
Jul 10, 7:14 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	31 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2007 Every severe thunderstorm warning in 2007

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.