Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 271
NWS Storm Prediction Center Norman OK
630 PM CDT Mon May 20 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Extreme west central Iowa
South central into east central and southeast Nebraska
* Effective this Monday night from 630 PM until Midnight CDT.
* Primary threats include...
Scattered large hail likely with isolated very large hail events
to 2 inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Scattered thunderstorms are expected to form this evening,
within an environment supporting supercells. Large hail of 1-2
inches in diameter and outflow gusts of 60-70 mph will be the main
threats through early tonight.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 10 miles west northwest
of Kearney NE to 45 miles northeast of Lincoln NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).
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 268...WW 269...WW 270...
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
24020.
...Thompson
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 271
NWS Storm Prediction Center Norman OK
630 PM CDT Mon May 20 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Extreme west central Iowa
South central into east central and southeast Nebraska
* Effective this Monday night from 630 PM until Midnight CDT.
* Primary threats include...
Scattered large hail likely with isolated very large hail events
to 2 inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Scattered thunderstorms are expected to form this evening,
within an environment supporting supercells. Large hail of 1-2
inches in diameter and outflow gusts of 60-70 mph will be the main
threats through early tonight.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 10 miles west northwest
of Kearney NE to 45 miles northeast of Lincoln NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).
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 268...WW 269...WW 270...
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
24020.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 271 SEVERE TSTM IA NE 202330Z - 210500Z
AXIS..55 STATUTE MILES NORTH AND SOUTH OF LINE..
10WNW EAR/KEARNEY NE/ - 45NE LNK/LINCOLN NE/
..AVIATION COORDS.. 50NM N/S /52SW OBH - 21WNW OVR/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24020.
LAT...LON 41579918 42109616 40509616 39989918
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 271 Status Report Messages:
STATUS REPORT #3 ON WW 271
VALID 210405Z - 210540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 5 WNW EAR TO
15 W OMA.
..KERR..05/21/24
ATTN...WFO...OAX...GID...
&&
STATUS REPORT FOR WS 271
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC085-133-155-165-210540-
IA
. IOWA COUNTIES INCLUDED ARE
HARRISON MONONA POTTAWATTAMIE
SHELBY
$$
NEC001-019-025-035-055-059-061-067-079-081-083-095-097-099-109-
129-131-137-151-153-155-159-169-181-185-210540-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ADAMS BUFFALO CASS
CLAY DOUGLAS FILLMORE
FRANKLIN GAGE HALL
HAMILTON HARLAN JEFFERSON
JOHNSON KEARNEY LANCASTER
NUCKOLLS OTOE PHELPS
SALINE SARPY SAUNDERS
SEWARD THAYER WEBSTER
YORK
$$
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.
$$
STATUS REPORT #2 ON WW 271
VALID 210235Z - 210340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..KERR..05/21/24
ATTN...WFO...OAX...GID...
&&
STATUS REPORT FOR WS 271
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC085-133-210340-
IA
. IOWA COUNTIES INCLUDED ARE
HARRISON MONONA
$$
NEC001-019-021-023-025-035-037-053-055-059-061-067-079-081-083-
093-095-097-099-109-121-125-129-131-137-141-143-151-153-155-159-
169-177-181-185-210340-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ADAMS BUFFALO BURT
BUTLER CASS CLAY
COLFAX DODGE DOUGLAS
FILLMORE FRANKLIN GAGE
HALL HAMILTON HARLAN
HOWARD JEFFERSON JOHNSON
KEARNEY LANCASTER MERRICK
NANCE NUCKOLLS OTOE
PHELPS PLATTE POLK
SALINE SARPY SAUNDERS
SEWARD THAYER WASHINGTON
WEBSTER YORK
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 271
VALID 210135Z - 210240Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..KERR..05/21/24
ATTN...WFO...OAX...GID...
&&
STATUS REPORT FOR WS 271
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC085-133-210240-
IA
. IOWA COUNTIES INCLUDED ARE
HARRISON MONONA
$$
NEC001-011-019-021-023-025-035-037-039-053-055-059-061-067-077-
079-081-083-093-095-097-099-109-119-121-125-129-131-137-141-143-
151-153-155-159-163-167-169-173-175-177-181-185-210240-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ADAMS BOONE BUFFALO
BURT BUTLER CASS
CLAY COLFAX CUMING
DODGE DOUGLAS FILLMORE
FRANKLIN GAGE GREELEY
HALL HAMILTON HARLAN
HOWARD JEFFERSON JOHNSON
KEARNEY LANCASTER MADISON
MERRICK NANCE NUCKOLLS
OTOE PHELPS PLATTE
POLK SALINE SARPY
SAUNDERS SEWARD SHERMAN
STANTON THAYER THURSTON
VALLEY WASHINGTON WEBSTER
YORK
$$
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 (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (60%)
|
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 (90%)
|
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 
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