Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 287
NWS Storm Prediction Center Norman OK
350 PM CDT Sat Jun 20 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
West-central/North-central Nebraska
Southern South Dakota
* Effective this Saturday afternoon and evening from 350 PM until
1000 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Severe thunderstorms are expected to develop/increase from
the southern South Dakota/north-central Nebraska border vicinity
southward into west-central/southwest Nebraska through early
evening. A few supercells are possible aside from sustained
multicells. Large hail and severe-caliber wind gusts will be
possible as storms spread east-southeastward through
early/mid-evening.
The severe thunderstorm watch area is approximately along and 70
statute miles east and west of a line from 50 miles north northeast
of Valentine NE to 45 miles east southeast of Imperial NE. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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 286...
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 450. Mean storm motion vector
30025.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 287 SEVERE TSTM NE SD 202050Z - 210300Z
AXIS..70 STATUTE MILES EAST AND WEST OF LINE..
50NNE VTN/VALENTINE NE/ - 45ESE IML/IMPERIAL NE/
..AVIATION COORDS.. 60NM E/W /53S PIR - 12WNW MCK/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 30025.
LAT...LON 43519877 40259950 40250216 43510157
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 287 Status Report Messages:
STATUS REPORT #2 ON WW 287
VALID 210035Z - 210140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NW EAR TO
30 SW BBW TO 35 S ANW TO 15 NE BUB.
..SQUITIERI..06/21/20
ATTN...WFO...LBF...GID...UNR...
&&
STATUS REPORT FOR WS 287
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC009-041-047-071-115-163-175-183-210140-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BLAINE CUSTER DAWSON
GARFIELD LOUP SHERMAN
VALLEY WHEELER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 287
VALID 202310Z - 210040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W MCK TO
30 N LBF TO 15 S VTN TO 30 SE PHP.
..SQUITIERI..06/20/20
ATTN...WFO...LBF...GID...UNR...
&&
STATUS REPORT FOR WS 287
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC009-015-017-041-047-063-071-073-089-103-111-113-115-149-163-
171-175-183-210040-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BLAINE BOYD BROWN
CUSTER DAWSON FRONTIER
GARFIELD GOSPER HOLT
KEYA PAHA LINCOLN LOGAN
LOUP ROCK SHERMAN
THOMAS VALLEY WHEELER
$$
SDC095-121-123-210040-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
MELLETTE TODD TRIPP
$$
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 (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (40%)
|
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.
weather.gov 
@NWSSPC
