Storm Prediction Center Severe Thunderstorm Watch 420
4 min read
2 months ago
Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended. Note: Click for Watch Status Reports.
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 420
NWS Storm Prediction Center Norman OK
445 PM MDT Sun Jun 15 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Colorado
Northwest Kansas
Western and West-Central Nebraska
* Effective this Sunday afternoon and evening from 445 PM until
1100 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Isolated very large hail events to 2 inches in diameter possible
SUMMARY...Widely scattered to scattered thunderstorms are forecast
to pose a risk for large hail and severe gusts through much of the
evening. A cluster of thunderstorms may evolve by the early to mid
evening, and the threat for severe gusts may persist into the late
evening.
The severe thunderstorm watch area is approximately along and 90
statute miles east and west of a line from 60 miles north northeast
of Alliance NE to 35 miles west of Goodland KS. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU0).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 418...WW 419...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27020.
...Smith
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 420
NWS Storm Prediction Center Norman OK
445 PM MDT Sun Jun 15 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Colorado
Northwest Kansas
Western and West-Central Nebraska
* Effective this Sunday afternoon and evening from 445 PM until
1100 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Isolated very large hail events to 2 inches in diameter possible
SUMMARY...Widely scattered to scattered thunderstorms are forecast
to pose a risk for large hail and severe gusts through much of the
evening. A cluster of thunderstorms may evolve by the early to mid
evening, and the threat for severe gusts may persist into the late
evening.
The severe thunderstorm watch area is approximately along and 90
statute miles east and west of a line from 60 miles north northeast
of Alliance NE to 35 miles west of Goodland KS. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU0).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 418...WW 419...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27020.
...Smith
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW0
WW 420 SEVERE TSTM CO KS NE 152245Z - 160500Z
AXIS..90 STATUTE MILES EAST AND WEST OF LINE..
60NNE AIA/ALLIANCE NE/ - 35W GLD/GOODLAND KS/
..AVIATION COORDS.. 80NM E/W /74SSE RAP - 31W GLD/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27020.
LAT...LON 42840057 39340067 39340404 42840412
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU0.
Watch 420 Status Report Messages:
STATUS REPORT #1 ON WW 420
VALID 160240Z - 160340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE ITR TO
45 NE AIA TO 30 E CDR.
..MARSH..06/16/25
ATTN...WFO...GLD...BOU...LBF...CYS...
&&
STATUS REPORT FOR WS 420
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
COC063-125-160340-
CO
. COLORADO COUNTIES INCLUDED ARE
KIT CARSON YUMA
$$
KSC023-153-181-160340-
KS
. KANSAS COUNTIES INCLUDED ARE
CHEYENNE RAWLINS SHERMAN
$$
NEC005-029-031-049-057-069-075-085-087-091-101-111-113-117-135-
161-171-160340-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ARTHUR CHASE CHERRY
DEUEL DUNDY GARDEN
GRANT HAYES HITCHCOCK
HOOKER KEITH LINCOLN
LOGAN MCPHERSON PERKINS
SHERIDAN THOMAS
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Probability of 1 or more strong (EF2-EF5) tornadoes
Low (<2%)
Wind
Probability of 10 or more severe wind events
Mod (50%)
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
Mod (30%)
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% (EF2-EF5 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.
