Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 336
NWS STORM PREDICTION CENTER NORMAN OK
1235 AM CDT SAT JUN 6 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEASTERN NEBRASKA
EFFECTIVE THIS SATURDAY MORNING FROM 1235 AM UNTIL 700 AM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST
OF COLUMBUS NEBRASKA TO 45 MILES EAST OF LINCOLN NEBRASKA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).
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 335...
DISCUSSION...MCS IS EXPECTED TO EVOLVE FROM INTENSE STORMS OVER
CENTRAL NEB LATE TONIGHT AND SHIFT EWD ACROSS SERN NEB ALONG NOSE OF
INTENSE LLJ. APPEARS SUFFICIENT DEEP LAYER SHEAR AND INSTABILITY
WILL BE PRESENT FOR ISOLATED SUPERCELLS AND POSSIBLE EVOLUTION INTO
A BOWING MCS. LARGE HAIL AND DAMAGING WINDS SHOULD ACCOMPANY THE
MORE INTENSE STORMS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27030.
...EVANS
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 336 SEVERE TSTM NE 060535Z - 061200Z
AXIS..55 STATUTE MILES NORTH AND SOUTH OF LINE..
45SW OLU/COLUMBUS NE/ - 45E LNK/LINCOLN NE/
..AVIATION COORDS.. 50NM N/S /29SE OBH - 21SSW OVR/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27030.
LAT...LON 41779795 41639591 40049591 40189795
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 336 Status Report Messages:
STATUS REPORT #2 ON WW 336
VALID 060840Z - 060940Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 WSW BIE
TO 5 SSW OLU TO 15 WSW OLU TO 30 WSW OFK.
..PETERS..06/06/09
ATTN...WFO...OAX...
&&
STATUS REPORT FOR WS 336
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC023-025-037-053-055-067-095-097-109-127-131-133-141-147-151-
153-155-159-177-060940-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BUTLER CASS COLFAX
DODGE DOUGLAS GAGE
JEFFERSON JOHNSON LANCASTER
NEMAHA OTOE PAWNEE
PLATTE RICHARDSON SALINE
SARPY SAUNDERS SEWARD
WASHINGTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 336
VALID 060740Z - 060840Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 957.
..PETERS..06/06/09
ATTN...WFO...OAX...
&&
STATUS REPORT FOR WS 336
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC011-023-025-037-053-055-067-095-097-109-127-131-133-141-147-
151-153-155-159-177-060840-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BOONE BUTLER CASS
COLFAX DODGE DOUGLAS
GAGE JEFFERSON JOHNSON
LANCASTER NEMAHA OTOE
PAWNEE PLATTE RICHARDSON
SALINE SARPY SAUNDERS
SEWARD WASHINGTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (40%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (80%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.