Severe Thunderstorm Watch 21

Issued

Mar 9, 2002, 8:30 PM EST (01:30 UTC)

Expired

Mar 10, 2002, 1:00 AM EST

In force

5 hr

Issued by

the Storm Prediction Center

The Binghamton radar (KBGM), 101 km from the middle of the area, began a volume at 01:33 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.

000 
WWUS20 KWNS 100059
SEL1  
SPC WW 100049
NYZ000-PAZ000-LOZ000-100600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 21
STORM PREDICTION CENTER NORMAN OK
749 PM EST SAT MAR 9 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   MUCH OF UPSTATE NEW YORK                           
   CENTRAL AND EASTERN PENNSYLVANIA                       
   LAKE ONTARIO                       

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 830 PM UNTIL
100 AM EST.

HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF HARRISBURG
PENNSYLVANIA TO 30 MILES EAST NORTHEAST OF WATERTOWN NEW YORK.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 20...

DISCUSSION...LINE OF LOW TOPPED CONVECTION WILL CONTINUE TO MOVE
ENEWD AT 50 KT AS STRONG NEGATIVELY TILTED SHORTWAVE MOVES NEWD
INTO THE AREA. STRONG PRESSURE FALL/RISE COUPLET AND SUBSIDENCE
INDICATED ON WATER VAPOR IMAGERY SUGGESTS THAT WIDESPREAD SEVERE
WINDS WILL CONTINUE DURING THE NEXT SEVERAL HOURS. 

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 0.5 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 300.  MEAN STORM MOTION
VECTOR 25050.

...IMY

440,0735 394,0753 394,0783 440,0770

WWUS20 KWNS 100059
SEL1  
SPC WW 100049
NYZ000-PAZ000-LOZ000-100600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 21
STORM PREDICTION CENTER NORMAN OK
749 PM EST SAT MAR 9 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   MUCH OF UPSTATE NEW YORK                           
   CENTRAL AND EASTERN PENNSYLVANIA                       
   LAKE ONTARIO                       

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 830 PM UNTIL
100 AM EST.

HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF HARRISBURG
PENNSYLVANIA TO 30 MILES EAST NORTHEAST OF WATERTOWN NEW YORK.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 20...

DISCUSSION...LINE OF LOW TOPPED CONVECTION WILL CONTINUE TO MOVE
ENEWD AT 50 KT AS STRONG NEGATIVELY TILTED SHORTWAVE MOVES NEWD
INTO THE AREA. STRONG PRESSURE FALL/RISE COUPLET AND SUBSIDENCE
INDICATED ON WATER VAPOR IMAGERY SUGGESTS THAT WIDESPREAD SEVERE
WINDS WILL CONTINUE DURING THE NEXT SEVERAL HOURS. 

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 0.5 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 300.  MEAN STORM MOTION
VECTOR 25050.

...IMY

440,0735 394,0753 394,0783 440,0770

Severe Thunderstorm Watches in Pennsylvania, 2002Severe Thunderstorm Watches in New York, 2002Every severe thunderstorm watch in 2002

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.