Alert archive / Illinois / Mesoscale Discussions in 2005

Mesoscale Discussion 921

May 19, 20055 states

The Storm Prediction Center issued this mesoscale discussion at May 19, 2005, 6:30 PM CDT for 5 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
May 19, 2005, 6:30 PM CDT (23:30 UTC)
Expired
May 19, 2005, 8:00 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 83 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Fulton County, IN, Howard County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, White County, IN, Clark County, MO, Columbia County, WI, Dane County, WI, Dodge County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Marquette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 110 km from the middle of the area, began a volume at 23:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.5 hours before the alert went out and 114 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 12:00Z on 2005-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2005-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -44 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
4 J/kg
Mixed-layer CIN
-149 J/kg
Mixed-layer LCL
996 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
-44 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 192330
SWOMCD
SPC MCD 192330 
INZ000-ILZ000-WIZ000-IAZ000-MOZ000-200100-

MESOSCALE DISCUSSION 0921
NWS STORM PREDICTION CENTER NORMAN OK
0630 PM CDT THU MAY 19 2005

AREAS AFFECTED...FAR ERN IA/FAR SRN WI/NRN IL INTO NW IN

CONCERNING...SEVERE THUNDERSTORM WATCH 290...293...

VALID 192330Z - 200100Z

SEVERE THREAT CONTINUES ACROSS WW 290 -- ESPECIALLY ACROSS NE IL --
AND WW 293 ACROSS NW IND THROUGH 02Z.

ONGOING WELL ORGANIZED TSTM CLUSTERS/ISOLD SUPERCELLS TO CONTINUE TO
SPREAD SEWD AROUND 35 KTS ACROSS NRN IL SOUTH OF I-80...WITH
CONTINUATION OF SEVERE THREAT OVER THE NEXT FEW HOURS. AIRMASS
REMAINS MODERATELY UNSTABLE ACROSS WW 290/WW 293...ESPECIALLY FROM
NE IL INTO NW IND. ENVIRONMENT APPEARS FAVORABLE FOR INTENSE CELL --
WITH HISTORY OF VERY LARGE HAIL AND DAMAGING WINDS -- OVER IROQUOIS
AND KANKAKEE COUNTIES TO CONTINUE TO SPREAD INTO
NEWTON/BENTON/WARREN COUNTIES OF NW IND GIVEN STRONG WLY/MODERATE
INSTABILITY FEED AND WELL MIXED BOUNDARY LAYER.

ELSEWHERE...SEVERE THREAT SHOULD CONTINUE TO DIMINISH ACROSS FAR ERN
IA/FAR SRN WI/NW IL IN THE SHORT TERM GIVEN LOSS OF DAYTIME HEATING.

..GUYER.. 05/19/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...IWX...IND...GRB...LOT...ILX...MKX...DVN...ARX...

41969203 42309085 42539015 43139031 43709070 43978963
43918879 43278833 42838781 41898760 41528586 40278589
40538691 40469043 40289188

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 6:58 AM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 34 more92 min
May 19, 10:44 AM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Crawford, Edwards, Effingham and 26 more3 hr
May 19, 11:15 AM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Clark, Clay, Clinton, Coles and 32 more8 hr
May 19, 12:41 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Henry and 16 more2 hr
May 19, 1:25 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 25 more8 hr
May 19, 3:36 PM CDTMesoscale DiscussionSPCAlexander, Clark, Clay, Clinton, Coles, Crawford and 27 more84 min
May 19, 3:50 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more85 min
May 19, 5:59 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clark, Clay, Clinton, Coles and 30 more91 min
May 19, 6:20 PM CDTSevere Thunderstorm WatchSPCBond, Cass, Champaign, Christian, Clay, Clinton and 40 more6 hr
May 19, 12:50 PM CDTSevere Thunderstorm WatchSPCClark, Crawford, Dubois, Floyd, Harrison, Perry and 4 more8 hr
May 19, 1:15 PM CDTMesoscale DiscussionSPCBartholomew, Benton, Boone, Brown, Clay, Clinton and 38 more2 hr
May 19, 2:00 PM CDTTornado WatchSPCBartholomew, Boone, Brown, Clay, Daviess, Decatur and 26 more7 hr
May 19, 3:26 PM CDTMesoscale DiscussionSPCBartholomew, Brown, Clay, Decatur, Fayette, Franklin and 17 more94 min
May 19, 3:41 PM CDTMesoscale DiscussionSPCCrawford, Dubois, Floyd, Harrison, Perry, Pike and 3 more64 min
May 19, 4:50 PM CDTSevere Thunderstorm WatchSPCBenton, Boone, Carroll, Cass, Clinton, Fountain and 18 more4 hr
May 19, 6:13 PM CDTMesoscale DiscussionSPCCrawford, Dubois, Floyd, Harrison, Perry, Spencer and 2 more2 hr
May 19, 6:29 PM CDTMesoscale DiscussionSPCBartholomew, Brown, Clay, Daviess, Dearborn, Decatur and 12 more91 min
May 18, 7:55 PM CDTMesoscale DiscussionSPCJackson35 min

Nearby

Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Indiana, 2005Mesoscale Discussions in Wisconsin, 2005Every mesoscale discussion in 2005

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.