Alert archive / New York / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 57, NWS New York, NY

July 1, 2008Rockland County, Westchester County, New York

NWS New York, NY issued this severe thunderstorm warning at Jul 1, 2008, 6:22 PM EDT for Rockland County, Westchester County, New York. It was in force for 23 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 1, 2008, 6:22 PM EDT (22:22 UTC)
Expired
Jul 1, 2008, 6:45 PM EDT
In force
23 min
Issued by
NWS New York, NY
Area
Storm-based polygon

Counties Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 92 km from the middle of the area, began a volume at 22:24 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 nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.4 hours before the alert went out and 92 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, Brookhaven, NY at 12:00Z on 2008-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 72 joules per kilogram.LCLLFCEL10008507005003002001001 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, Brookhaven, NY at 12:00Z on 2008-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939587897117Sfc1 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
72 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
1335 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
60 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 New York, NY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 3:26 PM EDT, 2 hours 56 minutes earlier.

Area forecast discussion, Jul 1, 3:26 PM EDT, 2 hours 56 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE UPTON NY
326 PM EDT TUE JUL 1 2008

.SYNOPSIS...
A WEAK FRONT DISSIPATES ACROSS THE AREA TONIGHT. HIGH PRESSURE THEN
BUILDS TO THE SOUTH. NEXT FRONT APPROACHES LATER THURSDAY FROM THE
NORTH...AND REMAINS PERCHED OVER THE LOCAL AREA THROUGH THE
WEEKEND.

&&

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
ANY CONVECTION DUE TO AFTERNOON INSTABILITY WILL DISSIPATE THIS
EVENING. MID AND UPPER TROUGH WILL GRADUALLY WEAKEN AS IT LIFTS TO
THE NORTHEAST THROUGH THE NIGHT. COULD OBSERVE AN ISOLATED
SHRA...BUT THIS WOULD BE ISOLATED AND THUS NOT INCLUDED IN
DATABASE.

OTHERWISE...DEBRIS CLOUDINESS INTO THE EVENING...OTHERWISE PARTLY
CLOUDY TO MOSTLY CLEAR. TEMPS SEASONABLE...AND BLEND USED.

&&

.SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY NIGHT/...
THE WEAKENING UPPER TROUGH AXIS LIFTS NORTHEAST QUICKLY WEDNESDAY
MORNING. NAM SOUNDINGS SEEM TOO MOIST IN BOUNDARY LAYER...WHICH
TRANSLATES TO HIGHER FCST INSTABILITY. MARGINALLY UNSTABLE CAPE VALUES
NOTED.

GFS BOUNDARY LAYER DRIER...AND THUS MORE STABLE. LOOKING AT MOS DEW
POINT FORECASTS...FEEL DRIER BOUNDARY LAYER WILL PREVAIL...AND THUS
LESS COVERAGE THROUGH THE MORNING HOURS. GOING AGAINST CLIMATOLOGY
FOR WESTERN SECTIONS. THESE LOCALES MAY BE SHRA/TSTM FREE DURING THE
AFTERNOON HOURS AS MUCH DRIER AIR FILTERS IN THROUGH THE COLUMN IN
WEST/NW FLOW KEEPS AREA CAPPED. FURTHER EAST...BETTER CHANCE AS
TROUGH AXIS HAS NOT QUITE CLEARED THE AREA.

DRY WEDNESDAY NIGHT AS THIS SHORTWAVE PIVOTS TO THE NORTHEAST.
THEN...BROAD TROUGH AND LOWERING HEIGHTS WILL BE THE RULE ACROSS
MUCH OF THE NORTHEAST THROUGH THE REMAINDER OF THE PERIOD. AT THE
SURFACE...COLD FRONT SLIDES SOUTHEASTWARD TOWARD THE AREA LATE IN
THE DAY THURSDAY AND THURSDAY NIGHT...THEN REMAINS STATIONARY OVER THE
AREA FRIDAY AND FRIDAY NIGHT. AS SUCH...SHRA/TSTMS POSSIBLE LATE
THURSDAY...AND THIS CHANCE CONTINUES THROUGH FRIDAY. MORE THAN
LIKELY...CONVECTION COVERAGE DIMINISHES LATER THU NIGHT AND FRIDAY
MORNING...THEN PICKS UP WITH DAYTIME HEATING.

AS FOR TEMPS...ABOVE NORMAL TEMPS EXPECTED THROUGH THURSDAY.
AGAIN...MOS BLEND FOLLOWED. EXPECTED CLOUD COVER FRIDAY WILL KEEP
READINGS DOWN A BIT...CLOSER TO NORMAL.

&&

.LONG TERM /SATURDAY THROUGH TUESDAY/...
MODELS ARE IN GENERAL AGREEMENT THAT A STALLED BOUNDARY WILL RESULT
IN UNSETTLED WEATHER THROUGH THE HOLIDAY WEEKEND.
HOWEVER...CONSIDERABLE DISAGREEMENT REMAINS CONCERNING THE TIMING
AND COVERAGE OF CONVECTION. HAVE OPTED FOR CHANCE POPS THROUGH
SUNDAY...WITH THE NEARBY FRONT SERVING AS A FOCUSING MECHANISM FOR
SEVERAL ROUNDS OF SHOWERS AND THUNDERSTORMS. THE FRONT WASHES OUT
AFTER SUNDAY...BUT SOUTHERLY FLOW WILL KEEP LOW LEVEL MOISTURE IN
PLACE. WARM AND HUMID CONDITIONS ARE EXPECTED FOR MONDAY AND
TUESDAY...WITH DIURNALLY DRIVEN CONVECTION A POSSIBILITY.

&&

.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
SHOWERS AND THUNDERSTORMS HAVE BEGUN TO DEVELOP ACROSS THE TRI-STATE
AREA. CONVECTION THIS AFTERNOON WILL PRODUCE MVFR TO POSSIBLE IFR
CONDITIONS IN STRONGER CELLS AS THEY MOVE ACROSS THE TERMINALS. THE
BEST CHANCE FOR ANY CONVECTION WILL BE NORTH AND WEST OF THE CITY.
HAVE HANDED THE CONVECTION WITH A TEMPO GROUP STARTING BETWEEN 19Z
AND 20Z.

WINDS WILL GENERALLY BE SOUTHWEST TO WEST....HOWEVER SHOULD BECOME
MORE WESTERLY OVERNIGHT. WINDS ARE FORECASTED TO GO BACK TO A MORE
SOUTHERLY FLOW TOMORROW.

OUTLOOK FOR 18Z WEDNESDAY THROUGH SUNDAY...
SHOWERS AND THUNDERSTORMS THURSDAY THROUGH SUNDAY WILL PROVIDE
MULTIPLE CHANCES FOR SUB VFR AS A FRONTAL SYSTEM BECOMES STALLED
NEAR THE REGION.

&&

.MARINE...
A PERSISTENT S/SW FLOW...COMBINED WITH SLOWLY SUBSIDING SWELLS WILL
KEEP SEAS RIGHT AROUND 5 FT. WILL GO AHEAD AND CONTINUE THE SCA
TONIGHT ON OCEAN. WINDS ARE EXPECTED TO REMAIN BELOW SCA CRITERIA
OVER THE NEXT SEVERAL DAYS. TOMORROW SEEMS TRICKY AS FAR AS SEAS ARE
CONCERNED. THE LATEST OBS SHOWING SEAS RIGHT AROUND 5 FT. IT IS
POSSIBLE THAT ALL OCEAN WATERS FALL BELOW SCA TOMORROW. DUE TO
UNCERTAINTY...WILL NOT EXTEND THE SCA INTO TOMORROW. THE
EVENING/OVERNIGHT SHIFT WILL HAVE TO TAKE A LOOK AT THIS.

GRADIENT TIGHTENS THURSDAY AHEAD OF APPROACHING COLD FRONT...WITH
WINDS INCREASING TO 20 TO 25 KT RANGE. COMBINED SEAS SHOULD ONCE
AGAIN BUILD TO THE 6 TO 7 FOOT RANGE IN RESPONSE. SCA WILL LIKELY BE
NEEDED FOR OCEAN SEAS...AND POSSIBLY FOR WIND GUSTS ACROSS ALL
WATERS THURS INTO THURS EVENING. WINDS AND SEAS SUBSIDE AS A COLD
FRONT PUSHES INTO THE AREA AND STALLS ACROSS OUR AREA FOR FRIDAY
INTO THE HOLIDAY WEEKEND WITH A WEAK GRADIENT.

&&

.HYDROLOGY...
ISOLATED TO SCT CONVECTION INTO THIS EVENING. LOCALLY HEAVY
DOWNPOURS POSSIBLE...BUT BASIN AVERAGE QPF WILL BE LESS THAN A
QUARTER INCH. MAINLY DRY THROUGH THURSDAY MORNING. UNSETTLED
WEATHER LATER IN THE WEEK.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
NY...NONE.
NJ...NONE.
MARINE...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 10 PM EDT THIS
     EVENING FOR ANZ355.
     SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 6 AM EDT
     WEDNESDAY FOR ANZ350-353.

&&

SYNOPSIS...PW
NEAR TERM...PW
SHORT TERM...PW
LONG TERM...MAS
AVIATION...BC
MARINE...BC
HYDROLOGY...PW
Hazardous weather outlook, Jul 1, 4:51 AM EDT, 13 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE UPTON NY
451 AM EDT TUE JUL 1 2008

NYZ075>077-080-081-020900-
KINGS (BROOKLYN)-QUEENS-NASSAU-SOUTHWESTERN SUFFOLK-
SOUTHEASTERN SUFFOLK-
451 AM EDT TUE JUL 1 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST NEW YORK.

.DAY ONE...TODAY AND TONIGHT

THERE IS A HIGH RISK OF RIP CURRENTS AT ATLANTIC BEACHES TODAY.
REFER TO THE LATEST SURF ZONE FORECAST AND COASTAL HAZARD MESSAGE
FOR DETAILS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME THAT WOULD MEET
NATIONAL WEATHER SERVICE WARNING CRITERIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

&&

THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL
WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING
CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN
EFFECT ARE HIGHLIGHTED.

PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS
WARNING CRITERIA.

CTZ005>012-NJZ002>006-011-NYZ067>074-078-079-020900-
NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-NORTHERN MIDDLESEX-
NORTHERN NEW LONDON-SOUTHERN FAIRFIELD-SOUTHERN NEW HAVEN-
SOUTHERN MIDDLESEX-SOUTHERN NEW LONDON-WESTERN PASSAIC-BERGEN-
EASTERN PASSAIC-ESSEX-HUDSON-UNION-ORANGE-PUTNAM-ROCKLAND-
NORTHERN WESTCHESTER-SOUTHERN WESTCHESTER-NEW YORK (MANHATTAN)-BRONX-
RICHMOND (STATEN ISLAND)-NORTHWESTERN SUFFOLK-NORTHEASTERN SUFFOLK-
451 AM EDT TUE JUL 1 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN
CONNECTICUT...NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME THAT WOULD MEET
NATIONAL WEATHER SERVICE WARNING CRITERIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

&&

THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL
WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING
CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN
EFFECT ARE HIGHLIGHTED.

PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS
WARNING CRITERIA.

ANZ330-335-338-340-345-350-353-355-020900-
LONG ISLAND SOUND EAST OF NEW HAVEN CT/PORT JEFFERSON NY-
LONG ISLAND SOUND WEST OF NEW HAVEN CT/PORT JEFFERSON NY-
NEW YORK HARBOR-PECONIC AND GARDINERS BAYS-
SOUTH SHORE BAYS FROM JONES INLET THROUGH SHINNECOCK BAY-
MORICHES INLET NY TO MONTAUK POINT NY OUT 20 NM-
FIRE ISLAND INLET NY TO MORICHES INLET NY OUT 20 NM-
SANDY HOOK NJ TO FIRE ISLAND INLET NY OUT 20 NM-
451 AM EDT TUE JUL 1 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ATLANTIC COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME THAT WOULD MEET
NATIONAL WEATHER SERVICE WARNING CRITERIA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

&&

THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL
WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING
CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN
EFFECT ARE HIGHLIGHTED.

PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS
WARNING CRITERIA.

In the hours before

Special weather statement, Jul 1, 4:32 PM EDT, 1 hour 50 minutes before
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Special weather statement, Jul 1, 4:58 PM EDT, 1 hour 24 minutes before
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Special weather statement, Jul 1, 5:08 PM EDT, 1 hour 14 minutes before
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Special weather statement, Jul 1, 5:10 PM EDT, 1 hour 12 minutes before
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Special weather statement, Jul 1, 5:52 PM EDT, 30 minutes before
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Special weather statement, Jul 1, 6:17 PM EDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE UPTON NY
617 PM EDT TUE JUL 1 2008

NJZ004-005-011-012245-
EASTERN PASSAIC-ESSEX-UNION-
617 PM EDT TUE JUL 1 2008

...STRONG THUNDERSTORM WILL IMPACT ESSEX...NORTHWESTERN UNION AND
PASSAIC COUNTIES...

AT 615 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR CHATHAM...OR NEAR MADISON...AND MOVING
NORTHEAST AT 13 MPH.

THIS STORM WILL BE...
  NEAR MILLBURN BY 625 PM.
  NEAR CALDWELL BY 645 PM.

SMALL HAIL...AND WINDS UP TO 40 MPH ARE EXPECTED WITH THIS STORM.

LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE
TO SAFE SHELTER IMMEDIATELY.

MAS

The office that day

Everything else NWS New York, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 1, 6:57 PM EDTAreal Flood AdvisoryOKXRockland, Westchester2 hr
Jul 1, 7:04 PM EDTSevere Thunderstorm WarningOKXWestchester41 min
Jul 1, 7:13 PM EDTFlash Flood WarningOKXRockland, Westchester92 min
Jul 1, 6:44 PM EDTAreal Flood AdvisoryOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region2 hr
Jul 1, 7:53 PM EDTSevere Thunderstorm WarningOKXGreater Bridgeport Planning Region, Naugatuck Valley Planning Region52 min

Nearby

Severe Thunderstorm Warnings in New York, 2008Every severe thunderstorm warning in 2008

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.