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 250
NWS Storm Prediction Center Norman OK
900 PM CDT Thu May 19 2022
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western and Central Iowa
Eastern Nebraska
* Effective this Thursday night and Friday morning from 900 PM
until 300 AM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Scattered strong to severe thunderstorms are expected to
develop the remainder of the evening and move east-northeastward
from eastern Nebraska across western/central Iowa. Bouts of large
hail and locally damaging winds will be possible with the most
intense storms.
The severe thunderstorm watch area is approximately along and 80
statute miles east and west of a line from 15 miles north northwest
of Mason City IA to 35 miles southwest of Omaha NE. 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 245...WW 246...WW
247...WW 248...WW 249...
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 550. Mean storm motion vector
25030.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW0
WW 250 SEVERE TSTM IA NE 200200Z - 200800Z
AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
15NNW MCW/MASON CITY IA/ - 35SW OMA/OMAHA NE/
..AVIATION COORDS.. 70NM E/W /16NNW MCW - 32WSW OVR/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 25030.
LAT...LON 43349185 40939484 40939791 43349504
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU0.
Watch 250 Status Report Messages:
STATUS REPORT #2 ON WW 250
VALID 200630Z - 200800Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 W ALO TO
10 ENE FOD TO 30 SE FRM.
REMAINING VALID PORTION OF WW 250 MAY BE ALLOWED TO EXPIRE AT
20/08Z.
..KERR..05/20/22
ATTN...WFO...DMX...FSD...OAX...
&&
STATUS REPORT FOR WS 250
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC023-025-033-069-081-189-195-197-200800-
IA
. IOWA COUNTIES INCLUDED ARE
BUTLER CALHOUN CERRO GORDO
FRANKLIN HANCOCK WINNEBAGO
WORTH WRIGHT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 250
VALID 200540Z - 200640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 ENE SDA
TO 25 S FOD TO 20 E SLB TO 20 SSW FRM.
..KERR..05/20/22
ATTN...WFO...DMX...FSD...OAX...
&&
STATUS REPORT FOR WS 250
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC001-015-023-025-033-049-069-075-077-079-081-083-091-099-109-
121-127-147-151-153-169-181-187-189-195-197-200640-
IA
. IOWA COUNTIES INCLUDED ARE
ADAIR BOONE BUTLER
CALHOUN CERRO GORDO DALLAS
FRANKLIN GRUNDY GUTHRIE
HAMILTON HANCOCK HARDIN
HUMBOLDT JASPER KOSSUTH
MADISON MARSHALL PALO ALTO
POCAHONTAS POLK STORY
WARREN WEBSTER WINNEBAGO
WORTH WRIGHT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
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 (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% (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
