May 23rd Wind Damage and Hail from Isolated Supercells

Overview

A warm front worked slowly north across the area starting late May 23rd into the early morning hours of the 24th. Isolated supercells developed across portions of N and NE Illinois and tracked towards mainly NW Indiana. The storms quickly encountered less unstable conditions east of US-31, which caused rapid weakening. Damage was confined to portions of LaPorte, St Joseph, Starke and Marshall counties in Indiana. While reports of wall clouds were received, no tornadoes were confirmed with damage being in the form of straight line winds, which in spots likely approached between 60 and 70 mph.

Damage Pictures
Radar
Storm Reports
Environment
Additional

Damage Pictures


Tree Damage in South Bend (From WSBT)	Tree Damage in South Bend (From WSBT)	Tree Damage in South Bend (From ABC57)	Tree Damage in South Bend (From ABC57)


Tree Damage in Fish Lake, IN (From Melissa Jaenicke)	Tree Damage in Fish Lake, IN (From Melissa Jaenicke)	Wall Cloud US30/35 near Hamlet (From Tony Ransbottom)	Tree Damage and Flooding in South Bend (From Heather Smith)


Tree Damage and Flooding in South Bend (From Heather Smith)	Caption (source)	Caption (source)	Caption (source)

Radar

The still radar images show the reflectivity and velocity data at times when most damage or noteable features were reported.


X marks where the spotter was that took picture of wall cloud near Hamlet. Circled area is approximate location of wall cloud	Lighter green pixels on right indicate strongest winds moving into SW side of South Bend	Caption	Caption

Storm Reports

PRELIMINARY LOCAL STORM REPORT...SUMMARY  
NATIONAL WEATHER SERVICE NORTHERN INDIANA  
134 AM EDT SUN MAY 24 2020  
   
.TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON  
   
.DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE.  
  
            ..REMARKS..  
  
0646 PM     MARINE TSTM WIND 2 WNW MICHIGAN CITY     41.73N 86.91W  
05/23/2020  M47 MPH          LMZ046             IN   C-MAN STATION      
  
            WIND GUST OF 41 KNOTS RECORDED AT THE   
            MICHIGAN CITY LIGHTHOUSE.   
  
1015 PM     TSTM WND DMG     3 N OAK GROVE           41.32N 86.49W  
05/23/2020                   STARKE             IN   911 CALL CENTER    
  
            TREE DOWN ON ROAD.   
  
1005 PM     TSTM WND DMG     1 WNW HAMLET            41.38N 86.60W  
05/23/2020                   STARKE             IN   911 CALL CENTER    
  
            TREES AND POWERLINES DOWNED.   
  
0800 PM     TSTM WND GST     2 SW MISHAWAKA          41.65N 86.20W  
05/23/2020  E60 MPH          ST. JOSEPH         IN   TRAINED SPOTTER    
  
               
  
0755 PM     TSTM WND DMG     1 W MISHAWAKA           41.67N 86.19W  
05/23/2020                   ST. JOSEPH         IN   PUBLIC             
  
            TREE DOWN ACROSS THE ROAD AT GROVE STREET   
            AND W. BENTON STREET. REPORTED VIA TWITTER.   
            TIME ESTIMATED FROM RADAR.   
  
0754 PM     TSTM WND DMG     1 SSW SOUTH BEND        41.66N 86.27W  
05/23/2020                   ST. JOSEPH         IN   TRAINED SPOTTER    
  
            3 FOOT DIAMETER TREES DOWN.   
  
0748 PM     TSTM WND DMG     3 WSW SOUTH BEND        41.66N 86.32W  
05/23/2020                   ST. JOSEPH         IN   EMERGENCY MNGR     
  
            SEVERAL LARGE TREES UPROOTED AND TRAILER   
            OVERTURNED NEAR INTERSECTION OF MAYFLOWER   
            ROAD AND SAMPLE STREET. TIME ESTIMATED FROM   
            RADAR.   
  
0748 PM     TSTM WND GST     3 E CHAIN-O-LAKES       41.71N 86.32W  
05/23/2020  M56 MPH          ST. JOSEPH         IN   ASOS               
  
               
  
1035 PM     TSTM WND DMG     2 S PLYMOUTH            41.32N 86.32W  
05/23/2020                   MARSHALL           IN   911 CALL CENTER    
  
            TWO TREES DOWNED.   
  
1031 PM     HAIL             3 NW TWIN LAKES         41.33N 86.40W  
05/23/2020  E0.75 INCH       MARSHALL           IN   PUBLIC             
  
            REPORT FROM MPING: DIME (0.75 IN.).   
  
0921 PM     HAIL             1 W WANATAH             41.44N 86.90W  
05/23/2020  E1.25 INCH       LA PORTE           IN   PUBLIC             
  
            REPORT FROM MPING: HALF DOLLAR (1.25 IN.).   
  
0720 PM     TSTM WND DMG     2 NNE FISH LAKE         41.59N 86.53W  
05/23/2020                   LA PORTE           IN   TRAINED SPOTTER    
  
            TREES BLOCKING THE ROAD ON 875E. TIME   
            ESTIMATED FROM RADAR.   
  
0720 PM     TSTM WND DMG     1 SE FISH LAKE          41.56N 86.54W  
05/23/2020                   LA PORTE           IN   PUBLIC             
  
            NUMEROUS TREES DOWN. REPORTED VIA FACEBOOK.   
            TIME ESTIMATED FROM RADAR.   
  
0707 PM     TSTM WND DMG     LA PORTE                41.61N 86.72W  
05/23/2020                   LA PORTE           IN   LAW ENFORCEMENT    
  
            TREES DOWN.

Environment

Coming Soon


Figure 1: RAP 700 mb heights analysis 5/23/20 21Z	Figure 2: RAP 850 mb heights (black) and dew points (green) 5/23/20 21Z	Figure 3: RAP 850 mb heights and moisture transport (green color-filled) 5/23/20 21Z

Near-storm environment summary.


Figure 4: RAP 850 mb moisture transport and PWAT 5/23/20 21Z	Figure 5: RAP Effective Shear 5/23/20 21Z	Figure 6: RAP Effective Helicity 5/23/20 21Z

Additional environmental data.


Figure 7: Caption	Figure 8: Caption	Figure 9: Caption

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