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  Wednesday June 17, 2026

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SPC Tornado Watch 342

WW 342 TORNADO IL MO 171915Z - 180300Z
      
WW 0342 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 342
NWS Storm Prediction Center Norman OK
215 PM CDT Wed Jun 17 2026

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Central Illinois
  Eastern Missouri

* Effective this Wednesday afternoon and evening from 215 PM
  until 1000 PM CDT.

* Primary threats include...
  Several tornadoes and a couple intense tornadoes likely
  Scattered damaging winds and isolated significant gusts to 75
    mph likely
  Scattered large hail and isolated very large hail events to 3
    inches in diameter likely

SUMMARY...Intense thunderstorms are expected to develop this
afternoon over eastern Missouri and western Illinois, tracking
across the watch through the evening.  Supercells capable of
tornadoes, large hail, and damaging winds are all possible with
these storms.

The tornado watch area is approximately along and 75 statute miles
north and south of a line from 30 miles north northwest of Columbia
MO to 35 miles east northeast of Mattoon IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).

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...CONTINUE...WW 340...WW 341...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 28035.

...Hart

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SPC Severe Thunderstorm Watch 341

WW 341 SEVERE TSTM IA MN WI 171820Z - 180100Z
      
WW 0341 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 341
NWS Storm Prediction Center Norman OK
120 PM CDT Wed Jun 17 2026

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast Iowa
  Southeast Minnesota
  Southwest Wisconsin

* Effective this Wednesday afternoon and evening from 120 PM
  until 800 PM 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
  A tornado or two possible

SUMMARY...Thunderstorms are expected to intensify this afternoon
near a surface low over southeast MN.  These storms will track
eastward toward the Mississippi River by early evening. The
strongest storms will be capable of large hail, damaging winds, and
perhaps a brief tornado.

The severe thunderstorm watch area is approximately along and 50
statute miles north and south of a line from 65 miles west northwest
of Rochester MN to 30 miles southeast of La Crosse WI. 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 340...

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
27030.

...Hart

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SPC Tornado Watch 342 Status Reports

WW 0342 Status Updates
      
WW 0342 Status Image

STATUS FOR WATCH 0342 HAS NOT BEEN ISSUED YET
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SPC Severe Thunderstorm Watch 341 Status Reports

WW 0341 Status Updates
      
WW 0341 Status Image

STATUS FOR WATCH 0341 HAS NOT BEEN ISSUED YET
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SPC Tornado Watch 340 Status Reports

WW 0340 Status Updates
      
WW 0340 Status Image

STATUS REPORT ON WW 340

SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 E IRK TO
25 SW PIA TO 25 WNW MMO.

..THORNTON..06/17/26

ATTN...WFO...LSX...DVN...ILX...LOT...


STATUS REPORT FOR WT 340 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

ILC001-009-013-017-019-021-023-029-035-039-041-045-053-061-063-
075-083-099-105-107-113-115-117-123-125-129-135-137-139-143-147-
149-155-167-169-171-173-179-183-203-171740-

IL 
.    ILLINOIS COUNTIES INCLUDED ARE

ADAMS                BROWN               CALHOUN             
CASS                 CHAMPAIGN           CHRISTIAN           
CLARK                COLES               CUMBERLAND          
DE WITT              DOUGLAS             EDGAR               
FORD                 GREENE              GRUNDY              
IROQUOIS             JERSEY              LA SALLE            
LIVINGSTON           LOGAN               MCLEAN              
MACON                MACOUPIN            MARSHALL            
MASON                MENARD              MONTGOMERY          
MORGAN               MOULTRIE            PEORIA              
PIATT                PIKE                PUTNAM              
SANGAMON             SCHUYLER            SCOTT               
SHELBY               TAZEWELL            VERMILION           
WOODFORD             


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
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SPC Severe Thunderstorm Watch 339 Status Reports

WW 0339 Status Updates
      
WW 0339 Status Image

STATUS REPORT ON WW 339

SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 ESE LWD
TO 30 NNE DBQ.

..THORNTON..06/17/26

ATTN...WFO...DMX...DVN...FSD...ARX...


STATUS REPORT FOR WS 339 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

ILC015-071-073-085-131-161-187-195-171540-

IL 
.    ILLINOIS COUNTIES INCLUDED ARE

CARROLL              HENDERSON           HENRY               
JO DAVIESS           MERCER              ROCK ISLAND         
WARREN               WHITESIDE           


IAC031-045-051-057-061-087-097-101-103-105-111-115-139-163-177-
179-183-171540-

IA 
.    IOWA COUNTIES INCLUDED ARE

CEDAR                CLINTON             DAVIS               
DES MOINES           DUBUQUE             HENRY               
JACKSON              JEFFERSON           JOHNSON             
JONES                LEE                 LOUISA              
MUSCATINE            SCOTT               VAN BUREN           
WAPELLO              WASHINGTON          


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
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SPC MD 1166

MD 1166 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR PORTIONS OF SOUTHEASTERN ARIZONA AND SOUTHWESTERN NEW MEXICO
MD 1166 Image


Mesoscale Discussion 1166
NWS Storm Prediction Center Norman OK
0216 PM CDT Wed Jun 17 2026

Areas affected...portions of southeastern Arizona and southwestern
New Mexico

Concerning...Severe potential...Watch unlikely 

Valid 171916Z - 172115Z

Probability of Watch Issuance...5 percent

SUMMARY...Scattered thunderstorm development is expected this
afternoon, with an associated risk for isolated damaging/severe wind
gusts. Watch issuance is not anticipated.

DISCUSSION...Latest surface observations indicate temperatures have
warmed into the mid/upper 90s F with dewpoints ranging from the
mid-40s to low-50s across portions of the Southwest (as of 19 UTC).
Modifying the 18z EPZ observed sounding for these conditions, a
deep, increasingly well-mixed boundary layer extending to near 500
mb is evident, with low- and mid-level lapse rates exceeding 9-9.5
C/km and LCLs of 3.5+ km. As continued insolation results in
convective temperatures being breached, scattered, high-based
thunderstorms development will occur over the next 1-3 hours. While
weak mid-level flow and effective shear will limit storm
organization, inverted-v thermodynamic profiles will support
efficient evaporative cooling and a risk for isolated
damaging/severe wind gusts through this evening. Watch issuance is
not expected at this time owing to the isolated nature of the severe
threat.

..Chalmers/Hart.. 06/17/2026

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...ABQ...EPZ...TWC...PSR...

LAT...LON   31270807 31230915 31261080 31481100 32181132 32501139
            33121133 33361124 33531102 33551039 33430960 33290899
            33120851 32850816 32520788 32000769 31810767 31680779
            31690808 31270807 

MOST PROBABLE PEAK WIND GUST...55-70 MPH

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XML error: Invalid document end at line 354: expected this afternoon, with an associated risk for isolated damaging/severe wind gusts. Watch issuance is not anticipated. DISCUSSION...Latest surface observations indicate temperatures have warmed into the mid/upper 90s F with dewpoints ranging from the mid-40s to low-50s across portions of the Southwest (as of 19 UTC). Modifying the 18z EPZ observed sounding for these conditions, a deep, increasingly well-mixed boundary layer extending to near 500 mb is evident, with low- and mid-level lapse rates exceeding 9-9.5 C/km and LCLs of 3.5+ km. As continued insolation results in convective temperatures being breached, scattered, high-based thunderstorms development will occur over the next 1-3 hours. While weak mid-level flow and effective shear will limit storm organization, inverted-v thermodynamic profiles will support efficient evaporative cooling and a risk for isolated damaging/severe wind gusts through this evening. Watch issuance is not expected at this time owing to the isolated nature of the severe threat. ..Chalmers/Hart.. 06/17/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...ABQ...EPZ...TWC...PSR... LAT...LON 31270807 31230915 31261080 31481100 32181132 32501139 33121133 33361124 33531102 33551039 33430960 33290899 33120851 32850816 32520788 32000769 31810767 31680779 31690808 31270807 MOST PROBABLE PEAK WIND GUST...55-70 MPH </pre> <a href="https://www.spc.noaa.gov/products/md/md1166.html">Read more</a> ]]> </description> <pubDate>Wed, 17 Jun 2026 19:33:02 +0000</pubDate> <guid isPermaLink="false">https://www.spc.noaa.gov/products/md/md1166.html/20260617</guid> </item> <item> <link>https://www.spc.noaa.gov/products/md/md1165.html</link> <title>SPC MD 1165</title> <description>MD 1165 CONCERNING SEVERE POTENTIAL...WATCH LIKELY FOR PORTIONS OF NORTHERN/CENTRAL MISSOURI...WESTERN ILLINOIS <![CDATA[<br /><a href="https://www.spc.noaa.gov/products/md/md1165.html"><img src="https://www.spc.noaa.gov/products/md/mcd1165.png" border="1" alt="MD 1165 Image" hspace="1" vspace="1" width="815" height="611" align="center" /></a><pre> Mesoscale Discussion 1165 NWS Storm Prediction Center Norman OK 0103 PM CDT Wed Jun 17 2026 Areas affected...portions of northern/central Missouri...western Illinois Concerning...Severe potential...Watch likely Valid 171803Z - 172000Z Probability of Watch Issuance...95 percent SUMMARY...Thunderstorm development likely by the afternoon with potential for all hazards including damaging wind, large hail, and strong tornadoes. DISCUSSION...Morning convection has moved into central/eastern Illinois, with trailing outflow and a zone of differential heating extending across northern Missouri into south-central Illinois. This zone will be the focus of redevelopment of thunderstorm activity this afternoon. Strong daytime heating is ongoing across central/northern Missouri into far western Illinois in the cloud free zone south of the outflow. SPC Mesoanalysis indicates that MLCIN is eroding in this region, with temperatures climbing into the mid 80s F. This is further confirmed by visible satellite trends with the cumulus near the vicinity of the outflow also becoming increasingly agitated. Strong deep layer shear around 50-55 kts is analyzed across this region, with STP around 2-3 across northern Missouri into far western Illinois. This in combination with strong to moderate instability edging northward will likely support initial supercells capable of large hail, damaging wind, and tornadoes (perhaps strong). A 40-50 kt low level jet axis extends from the southern/central Plains into Missouri/western Illinois. This is progged to shift north and eastward through the afternoon, which may shift the higher STP and more favorable tornado potential into portions of western/central Illinois. One or more watches will likely be needed to cover this potential this afternoon. ..Thornton/Hart.. 06/17/2026 ...Please see www.spc.noaa.gov for graphic product... ATTN...