Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 73
NWS Storm Prediction Center Norman OK
840 PM CDT Sat Mar 28 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northern and central Illinois
Lake Michigan
* Effective this Saturday night and Sunday morning from 840 PM
until 200 AM CDT.
* Primary threats include...
A couple intense tornadoes possible
Scattered damaging wind gusts to 60 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Low-topped arcing line of thunderstorms will spread
rapidly east-northeast across the rest of northern and central
Illinois through at least late evening before eventually weakening
overnight.
The tornado watch area is approximately along and 65 statute miles
east and west of a line from 15 miles south of Decatur IL to 10
miles northeast of Rockford IL. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU3).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.
&&
OTHER WATCH INFORMATION...This tornado watch replaces tornado
watch number 69. Watch number 69 will not be in effect after 840
PM CDT. CONTINUE...WW 70...WW 71...WW 72...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface wind
gusts to 50 knots. A few cumulonimbi with maximum tops to 350. Mean
storm motion vector 25045.
...Grams
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 73 TORNADO IL LM 290140Z - 290700Z
AXIS..65 STATUTE MILES EAST AND WEST OF LINE..
15S DEC/DECATUR IL/ - 10NE RFD/ROCKFORD IL/
..AVIATION COORDS.. 55NM E/W /8S AXC - 51WNW ORD/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..50 KNOTS.
MAX TOPS TO 350. MEAN STORM MOTION VECTOR 25045.
REPLACES WW 69..IA IL MO
LAT...LON 39619009 42309023 42308769 39618765
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 73 Status Report Messages:
STATUS REPORT #1 ON WW 73
VALID 290250Z - 290340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SW SPI TO
15 SSE PIA TO 30 NE PIA TO 25 WNW RFD.
..SPC..03/29/20
ATTN...WFO...DVN...ILX...LOT...
&&
STATUS REPORT FOR WT 73
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC019-021-037-039-053-063-075-089-091-093-099-103-105-107-113-
115-123-141-147-155-167-179-183-197-201-203-290340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
CHAMPAIGN CHRISTIAN DE KALB
DE WITT FORD GRUNDY
IROQUOIS KANE KANKAKEE
KENDALL LA SALLE LEE
LIVINGSTON LOGAN MCLEAN
MACON MARSHALL OGLE
PIATT PUTNAM SANGAMON
TAZEWELL VERMILION WILL
WINNEBAGO WOODFORD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (40%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Mod (30%)
|
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
|
Low (20%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (20%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Mod (60%)
|
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
