Alert archive / Nebraska / Mesoscale Discussions in 2021

Mesoscale Discussion 1243

July 10, 2021Fremont County, Page County, Iowa; Atchison County, Holt County, Missouri; 5 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2021, 3:44 PM CDT for Fremont County, Page County, Iowa; Atchison County, Holt County, Missouri; 5 counties in Nebraska. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Jul 10, 2021, 3:44 PM CDT (20:44 UTC)
Expired
Jul 10, 2021, 5:15 PM CDT
In force
91 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 366

Counties Fremont County, IA, Page County, IA, Atchison County, MO, Holt County, MO, Gage County, NE, Johnson County, NE, Nemaha County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Omaha radar (KOAX), 111 km from the middle of the area, began a volume at 20:46 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

Omaha, NE (KOAX), launched 12:00Z, 8.7 hours before the alert went out and 111 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, Omaha, NE at 12:00Z on 2021-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Omaha, NE at 12:00Z on 2021-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
976 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
53 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

181 
ACUS11 KWNS 102044
SWOMCD
SPC MCD 102044 
IAZ000-MOZ000-NEZ000-KSZ000-102215-

Mesoscale Discussion 1243
NWS Storm Prediction Center Norman OK
0344 PM CDT Sat Jul 10 2021

Areas affected...Southeastern Nebraska...Southwestern Iowa...Far
Northwestern Missouri...and Far Northeastern Kansas

Concerning...Severe Thunderstorm Watch 366...

Valid 102044Z - 102215Z

The severe weather threat for Severe Thunderstorm Watch 366
continues.

SUMMARY...The severe weather threat continues across portions of
Severe Thunderstorm Watch 366.

DISCUSSION...The merging of outflows from numerous storms across the
watch has led to upscale growth across southeastern Nebraska and
southwestern Iowa.  Thus, the greatest short-term severe weather
threat is likely damaging winds from the portion of the line surging
to the southeast.  As this thunderstorm complex continues to push
southeastward, it will encounter a more favorable thermodynamic and
kinematic environment, supporting the continued severe weather
threat.

..Jirak/Bunting.. 07/10/2021

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

ATTN...WFO...DMX...EAX...OAX...TOP...

LAT...LON   40379684 40679594 40889563 41019537 40979506 40659481
            40209502 39949548 39879606 39859658 39979694 40379684

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 9, 7:08 PM CDTSevere Thunderstorm WatchSPCDes Moines, Henry, Iowa, Jefferson, Johnson, Keokuk and 4 more3 hr
Jul 9, 9:12 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Fremont, Harrison, Mills and 7 more2 hr
Jul 9, 9:58 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Carroll, Cass, Clarke and 16 more7 hr
Jul 10, 1:20 PM CDTMesoscale DiscussionSPCFremont, Mills, Montgomery, Page115 min
Jul 10, 2:18 PM CDTSevere Thunderstorm WatchSPCAdams, Audubon, Cass, Fremont, Harrison, Mills and 5 more7 hr
Jul 9, 7:54 PM CDTMesoscale DiscussionSPCAdair, Audrain, Chariton, Clark, Grundy, Knox and 18 more36 min
Jul 9, 8:18 PM CDTTornado WatchSPCAdair, Audrain, Boone, Callaway, Carroll, Chariton and 32 more6 hr
Jul 9, 10:26 PM CDTMesoscale DiscussionSPCAdair, Audrain, Boone, Callaway, Chariton, Cole and 21 more64 min
Jul 10, 1:01 AM CDTMesoscale DiscussionSPCBollinger, Boone, Callaway, Cape Girardeau, Chariton, Cole and 23 more59 min
Jul 10, 1:21 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 11 more84 min
Jul 10, 1:36 AM CDTSevere Thunderstorm WatchSPCBollinger, Butler, Cape Girardeau, Carter, Perry, Ripley and 3 more4 hr
Jul 10, 2:57 AM CDTMesoscale DiscussionSPCBates, Caldwell, Carroll, Cass, Chariton, Clay and 20 more93 min
Jul 10, 3:09 AM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Perry, Ripley and 3 more2 hr
Jul 10, 5:04 AM CDTMesoscale DiscussionSPCButler, Carter, Ripley, Stoddard56 min
Jul 10, 11:37 AM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Howell, Laclede, McDonald and 9 more83 min
Jul 10, 1:25 PM CDTMesoscale DiscussionSPCBollinger, Butler, Camden, Cape Girardeau, Carter, Cedar and 34 more2 hr
Jul 10, 2:01 PM CDTSevere Thunderstorm WatchSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Franklin and 16 more8 hr
Jul 10, 2:17 PM CDTMesoscale DiscussionSPCBarry, Barton, Jasper, McDonald, Newton, Vernon118 min
Jul 10, 3:02 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 26 more8 hr
Jul 10, 5:27 PM CDTMesoscale DiscussionSPCAndrew, Buchanan, Caldwell, Carroll, Clay, Clinton and 13 more2 hr
Jul 9, 8:21 PM CDTMesoscale DiscussionSPCAdams, Antelope, Arthur, Blaine, Boone, Boyd and 44 more114 min
Jul 9, 8:45 PM CDTSevere Thunderstorm WatchSPCAdams, Antelope, Boone, Buffalo, Cedar, Clay and 28 more8 hr
Jul 9, 9:06 PM CDTSevere Thunderstorm WatchSPCArthur, Blaine, Boyd, Brown, Cherry, Custer and 15 more6 hr
Jul 9, 10:20 PM CDTMesoscale DiscussionSPCButler, Clay, Fillmore, Gage, Hamilton, Jefferson and 7 more115 min
Jul 9, 10:44 PM CDTMesoscale DiscussionSPCBox Butte, Garden, Grant, Sheridan91 min
Jul 10, 1:37 AM CDTMesoscale DiscussionSPCCuster, Dawson, Lincoln, Logan, Thomas53 min
Jul 10, 1:45 AM CDTMesoscale DiscussionSPCCuster, Dawson, Lincoln, Logan, Thomas60 min

Nearby

Mesoscale Discussions in Nebraska, 2021Mesoscale Discussions in Iowa, 2021Mesoscale Discussions in Missouri, 2021Every mesoscale discussion in 2021

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.