Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 175
NWS STORM PREDICTION CENTER NORMAN OK
925 PM CDT SAT MAY 18 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN IOWA
EASTERN NEBRASKA
SOUTHEAST SOUTH DAKOTA
* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 925 PM
UNTIL 400 AM CDT.
* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF
YANKTON SOUTH DAKOTA TO 10 MILES EAST SOUTHEAST OF FALLS CITY
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 170...WW 171...WW
172...WW 173...WW 174...
DISCUSSION...E CNTRL/SE NEB SQLN EXPECTED TO CONTINUE MAINLY
NEWD...WITH A CONTINUING THREAT FOR DMGG WIND...MARGINALLY SVR
HAIL... AND POSSIBLY A TORNADO AS MID TROPOSPHERIC SPEED MAX MOVES
NEWD WITH IT. MOIST...LOW-LVL SSELY FLOW AHEAD OF SQLN WILL MAINTAIN
POTENTIAL FOR LOW-LVL MESO CIRCULATIONS AND PERHAPS A BRIEF
TORNADO...BUT GRADUALLY STRENGTHENING CIN SHOULD LIMIT OVERALL
UPDRAFT STRENGTH/LONGEVITY...AND THE POTENTIAL FOR TORNADOES.
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 22030.
...CORFIDI
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW5
WW 175 SEVERE TSTM IA NE SD 190225Z - 190900Z
AXIS..70 STATUTE MILES EAST AND WEST OF LINE..
55NW YKN/YANKTON SD/ - 10ESE FNB/FALLS CITY NE/
..AVIATION COORDS.. 60NM E/W /61W FSD - 38ESE PWE/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 22030.
LAT...LON 43479676 40009409 40009675 43479955
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU5.
Watch 175 Status Report Messages:
STATUS REPORT #2 ON WW 175
VALID 190545Z - 190640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 SSW FNB
TO 10 SW LNK TO 25 NNW TQE TO 25 NW SUX TO 20 SSE MHE.
..PETERS..05/19/13
ATTN...WFO...OAX...FSD...
&&
STATUS REPORT FOR WS 175
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC071-085-119-129-133-137-145-149-155-165-167-193-190640-
IA
. IOWA COUNTIES INCLUDED ARE
FREMONT HARRISON LYON
MILLS MONONA MONTGOMERY
PAGE PLYMOUTH POTTAWATTAMIE
SHELBY SIOUX WOODBURY
$$
NEC021-025-043-053-055-097-109-127-131-147-153-155-173-177-
190640-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BURT CASS DAKOTA
DODGE DOUGLAS JOHNSON
LANCASTER NEMAHA OTOE
RICHARDSON SARPY SAUNDERS
THURSTON WASHINGTON
$$
SDC027-067-083-125-127-135-190640-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CLAY HUTCHINSON LINCOLN
TURNER UNION YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 175
VALID 190405Z - 190540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NW BIE TO
30 ENE OLU TO 45 NNW ONL.
..SMITH..05/19/13
ATTN...WFO...OAX...FSD...
&&
STATUS REPORT FOR WS 175
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC071-085-119-129-133-137-145-149-155-165-167-193-190540-
IA
. IOWA COUNTIES INCLUDED ARE
FREMONT HARRISON LYON
MILLS MONONA MONTGOMERY
PAGE PLYMOUTH POTTAWATTAMIE
SHELBY SIOUX WOODBURY
$$
NEC021-025-027-039-043-051-053-055-097-107-109-127-131-133-139-
147-153-155-173-177-179-190540-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BURT CASS CEDAR
CUMING DAKOTA DIXON
DODGE DOUGLAS JOHNSON
KNOX LANCASTER NEMAHA
OTOE PAWNEE PIERCE
RICHARDSON SARPY SAUNDERS
THURSTON WASHINGTON WAYNE
$$
SDC009-023-027-043-053-067-083-125-127-135-190540-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BON HOMME CHARLES MIX CLAY
DOUGLAS GREGORY HUTCHINSON
LINCOLN TURNER UNION
YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (<5%)
|
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.
weather.gov 
@NWSSPC
