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The expiration time in the watch graphic is amended if the watch is
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Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 541
NWS STORM PREDICTION CENTER NORMAN OK
250 PM MDT FRI JUL 3 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST COLORADO
WESTERN NEBRASKA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 250 PM UNTIL 900
PM MDT.
HAIL TO 1.5 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH
NORTHWEST OF MULLEN NEBRASKA TO 30 MILES WEST OF AKRON COLORADO.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).
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 540...
DISCUSSION...STORMS WILL CONTINUE TO INCREASE FROM SERN WY ACROSS
NERN CO AND INTO THE NEB PANHANDLE THROUGH THE EVENING HOURS. THIS
ACTIVITY WAS DEVELOPING WITHIN A MODESTLY UNSTABLE AIRMASS WHERE
EFFECTIVE DEEP-LAYER SHEAR AROUND 40KT WILL SUPPORT SUPERCELLS. LIFT
ACROSS THE REGION WILL BE ENHANCED/SUSTAINED BY SHORT WAVE TROUGH
DEVELOPING EAST FROM THE ROCKIES AND SHOULD CONTRIBUTE TO AN
INCREASING THREAT FOR LARGE HAIL AND HIGH WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28020.
...CARBIN
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 541 SEVERE TSTM CO NE 032050Z - 040300Z
AXIS..65 STATUTE MILES EAST AND WEST OF LINE..
60NNW MHN/MULLEN NE/ - 30W AKO/AKRON CO/
..AVIATION COORDS.. 55NM E/W /70WNW ANW - 28W AKO/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28020.
LAT...LON 42840023 40160255 40160501 42840280
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 541 Status Report Messages:
STATUS REPORT #5 ON WW 541
VALID 040245Z - 040300Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ESE CYS
TO 35 NNW IML.
WW 541 WILL BE ALLOWED TO EXPIRE AT 040300Z.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1423.
..PETERS..07/04/09
ATTN...WFO...BOU...GLD...LBF...CYS...
&&
STATUS REPORT FOR WS 541
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC073-075-087-095-115-121-123-125-040300-
CO
. COLORADO COUNTIES INCLUDED ARE
LINCOLN LOGAN MORGAN
PHILLIPS SEDGWICK WASHINGTON
WELD YUMA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #4 ON WW 541
VALID 040150Z - 040240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ESE CYS
TO 35 NNW IML.
..PETERS..07/04/09
ATTN...WFO...BOU...GLD...LBF...CYS...
&&
STATUS REPORT FOR WS 541
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC073-075-087-095-115-121-123-125-040240-
CO
. COLORADO COUNTIES INCLUDED ARE
LINCOLN LOGAN MORGAN
PHILLIPS SEDGWICK WASHINGTON
WELD YUMA
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 541
VALID 040035Z - 040140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ESE FCL
TO 40 W SNY TO 35 SW BFF TO 10 NE BFF TO 5 E AIA TO 35 WNW MHN TO
50 W VTN.
..PETERS..07/04/09
ATTN...WFO...BOU...GLD...LBF...CYS...
&&
STATUS REPORT FOR WS 541
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC073-075-087-095-115-121-123-125-040140-
CO
. COLORADO COUNTIES INCLUDED ARE
LINCOLN LOGAN MORGAN
PHILLIPS SEDGWICK WASHINGTON
WELD YUMA
$$
NEC005-007-031-033-049-069-075-091-101-105-117-123-135-157-
040140-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ARTHUR BANNER CHERRY
CHEYENNE DEUEL GARDEN
GRANT HOOKER KEITH
KIMBALL MCPHERSON MORRILL
PERKINS SCOTTS BLUFF
$$
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.
$$
STATUS REPORT #2 ON WW 541
VALID 032335Z - 040040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NNE BFF
TO 10 E AIA TO 35 ENE CDR.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1420.
..PETERS..07/03/09
ATTN...WFO...BOU...GLD...LBF...CYS...
&&
STATUS REPORT FOR WS 541
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC073-075-087-095-115-121-123-125-040040-
CO
. COLORADO COUNTIES INCLUDED ARE
LINCOLN LOGAN MORGAN
PHILLIPS SEDGWICK WASHINGTON
WELD YUMA
$$
NEC005-007-031-033-049-069-075-091-101-105-117-123-135-157-161-
040040-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ARTHUR BANNER CHERRY
CHEYENNE DEUEL GARDEN
GRANT HOOKER KEITH
KIMBALL MCPHERSON MORRILL
PERKINS SCOTTS BLUFF SHERIDAN
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 541
VALID 032250Z - 032340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..PETERS..07/03/09
ATTN...WFO...BOU...GLD...LBF...CYS...
&&
STATUS REPORT FOR WS 541
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC073-075-087-095-115-121-123-125-032340-
CO
. COLORADO COUNTIES INCLUDED ARE
LINCOLN LOGAN MORGAN
PHILLIPS SEDGWICK WASHINGTON
WELD YUMA
$$
NEC005-007-013-031-033-045-049-069-075-091-101-105-117-123-135-
157-161-032340-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ARTHUR BANNER BOX BUTTE
CHERRY CHEYENNE DAWES
DEUEL GARDEN GRANT
HOOKER KEITH KIMBALL
MCPHERSON MORRILL PERKINS
SCOTTS BLUFF SHERIDAN
$$
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 (20%)
|
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 (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (20%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
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.
weather.gov 
