Alert archive / New Jersey / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 14, NWS New York, NY
NWS New York, NY issued this severe thunderstorm warning at Jul 10, 1999, 12:24 AM EDT for Rockland County, New York; Bergen County, Passaic County, New Jersey. It was in force for 66 min. 2 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 10, 1999, 12:24 AM EDT (04:24 UTC)
- Expired
- Jul 10, 1999, 1:30 AM EDT
- In force
- 66 min
- Issued by
- NWS New York, NY
- Area
- Whole counties
Counties Bergen County, NJ, Passaic County, NJ, Rockland County, NY
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 10, 1:00 AM EDT | Thunderstorm Wind 50 | Bear Mtn, NY | |
| Jul 10, 1:10 AM EDT | Thunderstorm Wind 50 | Mahwah, NJ |
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 nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 4.4 hours before the alert went out and 108 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1694 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 314 m²/s²
- 0-3 km storm-relative helicity
- 509 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 New York, NY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 9, 8:10 PM EDT, 4 hours 14 minutes earlier.
Area forecast discussion, Jul 9, 8:10 PM EDT, 4 hours 14 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW YORK NY 810 PM EDT FRI JUL 9 1999 SFC ANAL SHOWED WRMFNT MOVG ACRS THE FCST AREA THIS EVE. AIR MASS BCMG MORE UNSTBL AS DEWPTS RISE IN THE WRMR AIR. MEANWHILE A LN OF STG CNVCTN WELL OUT AHD OF THE SFC CDFNT...XTDG FM WRN NY THRU WRN PA INTO OH...WAS MOVG RPDLY EWD WITH THE H7 FLO. SOME OF THIS CNVCTN SHUD HOLD TOGETHER IN ITS TREK ACRS PA AND INTO THE FCST AREA. EXTRAPOLATION OF CURRENT MVMNT WUD BRING THE PCPN HERE ARND OR SHRTLY AFT MIDN. AIR MASS SHUD STABLIZE SOMEWHAT BHD THIS LN...LESSENING THE CHC OF CNVCTN ON SAT WITH THE APCH OF THE CDFNT. WITH THE ABV THINKING IN MIND WL MAKE THE FLWG CHGS TO THE CURRENT FCSTS. WL HIT THE POPS HARDER TNGT THAN SAT. WL INCL A CHC OF TSTMS OVRNGT...THEN TONE DOWN THE CHC OF TSTMS TMRW AND LIMIT THEM TO THE AFTN HRS JUST AHD OF THE CDFNT. REST OF FCST PDS LOOK FINE. .NYC/OKX...NONE EY
The office that day
Everything else NWS New York, NY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 11:52 PM EDT | Severe Thunderstorm Warning | OKX | Orange | 53 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 1999Severe Thunderstorm Warnings in New York, 1999Every severe thunderstorm warning 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.