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Wednesday June 17, 2026

Current Conditions iPhone Weather Data Current Monthly Data Hourly Obs Yesterday's Hourly Summary Daily Climate Maps Monthly Averages Monthly Data and Records Graphs 1 Minute Graphs Daily Graphs Forecasts Westford Area Forecast Discussion Webcam Current image Time Lapse Webcam Gallery About This Cam Radar KCXX Composite Refl Loop Northeast Refl Loop National Refl Loop Severe Weather Public Information Statements Special Weather Statements Local Storm Reports SPC Severe Wx Summary Tropical Advisories Satellite Visible Enhanced IR Water Vapor Sun & Moon About Station Links Hailstorm 7/16/09 WxUnderground		RSS Mesoscale Discussions from Storm Prediction Center SPC Tornado Watch 342 WW 342 TORNADO IL MO 171915Z - 180300Z 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 Read more SPC Severe Thunderstorm Watch 341 WW 341 SEVERE TSTM IA MN WI 171820Z - 180100Z 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 Read more SPC Tornado Watch 342 Status Reports WW 0342 Status Updates STATUS FOR WATCH 0342 HAS NOT BEEN ISSUED YET Read more SPC Severe Thunderstorm Watch 341 Status Reports WW 0341 Status Updates STATUS FOR WATCH 0341 HAS NOT BEEN ISSUED YET Read more SPC Tornado Watch 340 Status Reports WW 0340 Status Updates 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 Read more SPC Severe Thunderstorm Watch 339 Status Reports WW 0339 Status Updates 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 Read more SPC MD 1166 MD 1166 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR PORTIONS OF SOUTHEASTERN ARIZONA AND SOUTHWESTERN NEW MEXICO 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 Read more 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...