Snow in the Rockies; Showers and Thunderstorms Along the Gulf Coast; Potential Winter Storm for Northern Mid-Atlantic and Interior New England

A winter-like pattern will continue over much of the Lower 48 over the next few days, with snow stretching from the Rockies today into the Middle Mississippi Valley on Monday. Showers and thunderstorms will develop along the Gulf Coast and Southeast on Monday. As the storm moves northward late Monday into Tuesday, winter weather is possible from the Central Appalachians to Interior New England. Read More >

Overview

A strong low pressure system and its associated cold front brought multiple lines of thunderstorms to central Indiana during the late afternoon and evening of October 11. Some of the storms caused tree damage and property damage in the western half of central Indiana.

Radar
Storm Reports
Environment

Radar


Radar/Base Velocity Image at 5:11 PM EDT	Radar/Base Velocity at 5:47 PM EDT	Radar/Base Velocity at 9:37 PM EDT

Radar Loop from 5:00 PM EDT to 11:00 PM EDT

Storm Reports

Below are reports received by NWS Indianapolis

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
121 PM EDT TUE OCT 12 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0438 PM     TSTM WND GST     3 S TERRE HAUTE         39.43N 87.38W
10/11/2021  U50 MPH          VIGO               IN   BROADCAST MEDIA



0448 PM     TSTM WND DMG     3 WSW SHEPARDSVILLE     39.58N 87.46W
10/11/2021                   VIGO               IN   PUBLIC

            A REPORT OF A 50 TO 60 FOOT TREE BLOWN DOWN
            FROM THUNDERSTORM WINDS WAS RECEIVED.
            LOCATION AND TIME IS APPROXIMATE.

0503 PM     TSTM WND GST     5 SW VEEDERSBURG        40.07N 87.33W
10/11/2021  M54 MPH          FOUNTAIN           IN   MESONET

            PERSONAL WEATHER STATION KINCOVIN8, RELAYED
            FROM BROADCAST MEDIA.

0504 PM     TSTM WND GST     1 ESE ROCKVILLE         39.76N 87.21W
10/11/2021  M58 MPH          PARKE              IN   MESONET

            CORRECTS PREVIOUS TSTM WND GST REPORT FROM 1
            ESE ROCKVILLE. RECORDED FROM PERSONAL
            WEATHER STATION OF A SPOTTER, RELAYED BY
            BROADCAST MEDIA.

0507 PM     TSTM WND DMG     ATTICA                  40.29N 87.25W
10/11/2021                   FOUNTAIN           IN   NWS STORM SURVEY

            *** 1 INJ ***
            NWS EMPLOYEE NOTED VERY STRONG STRAIGHT LINE
            WINDS CAUSING SIGNIFICANT TREE DAMAGE ACROSS
            TOWN ALONG WITH TREES THAT FELL ONTO 3
            HOUSES. ONE MINOR INJURY AT ONE OF THE
            RESIDENCES WHERE THE TREES FELL. A FAIR
            AMOUNT OF ROT WAS NOTED IN THE TREES.

0507 PM     TSTM WND DMG     ATTICA                  40.29N 87.25W
10/11/2021                   FOUNTAIN           IN   BROADCAST MEDIA

            LARGE TREES AND LIMBS DOWN IN ATTICA. SOME
            ARE BLOCKING STREETS. TIME IS APPROXIMATED
            FROM RADAR VELOCITY COUPLET.

0507 PM     TSTM WND DMG     1 SW ATTICA             40.28N 87.25W
10/11/2021                   FOUNTAIN           IN   BROADCAST MEDIA

            REPORT OF ROOF DAMAGE TO ATTICA HIGH SCHOOL
            FROM STORM WIND. WATER DAMAGE TO PRINCIPLES
            OFFICE.

0507 PM     TSTM WND DMG     ATTICA                  40.29N 87.25W
10/11/2021                   FOUNTAIN           IN   PUBLIC

            THERE ARE AT LEAST TWO HOMES DAMAGED WITH
            TREES DOWN.

0521 PM     HAIL             3 W NEW MARKET          39.95N 86.98W
10/11/2021  E1.00 INCH       MONTGOMERY         IN   NWS EMPLOYEE

            HAIL SLIGHTLY LARGER THAN THE SIZE OF
            QUARTERS WERE FALLING AT 400 WEST AND 600
            SOUTH.

0525 PM     TSTM WND GST     2 SW PURDUE UNIVERSITY  40.41N 86.94W
10/11/2021  M54 MPH          TIPPECANOE         IN   ASOS



0525 PM     TSTM WND DMG     3 WSW PURDUE UNIVERSITY 40.41N 86.96W
10/11/2021                   TIPPECANOE         IN   PUBLIC

            REPORTS OF NUMEROUS TREE LIMBS BLOWN DOWN BY
            THUNDERSTORM WINDS ALONG SOUTH NEWMAN ROAD
            WERE RECEIVED. TIME ESTIMATED VIA ASOS MAX
            WIND GUST REPORT.

0526 PM     TSTM WND GST     1 NW WEST LAFAYETTE     40.46N 86.93W
10/11/2021  M60 MPH          TIPPECANOE         IN   BROADCAST MEDIA

            AT WLFI.

0528 PM     TSTM WND DMG     9 ENE PINE VILLAGE      40.48N 87.09W
10/11/2021                   TIPPECANOE         IN   EMERGENCY MNGR

            LATE REPORT OF A 24 FOOT BY 20 FOOT
            STRUCTURE FLATTENED ON SOUTH KERKHOFF
            AVENUE. TIME ESTIMATED FROM RADAR.

0534 PM     TSTM WND DMG     DAYTON                  40.38N 86.77W
10/11/2021                   TIPPECANOE         IN   EMERGENCY MNGR

            TREES DOWNED ACROSS DAYTON.

0536 PM     TSTM WND GST     4 S LAFAYETTE           40.35N 86.87W
10/11/2021  M52 MPH          TIPPECANOE         IN   TRAINED SPOTTER

            REPORT RECEIVED VIA SPOTTERNETWORK.ORG.

0549 PM     TSTM WND DMG     2 SE BATTLE GROUND      40.49N 86.82W
10/11/2021                   TIPPECANOE         IN   PUBLIC

            LATE REPORT OF APPROXIMATE 10 INCH DIAMETER
            LIMB BROKEN FROM TREE AT INTERSECTION OF OLD
            STATE ROAD 25 AND COUNTY ROAD 500 NORTH.

0608 PM     TSTM WND DMG     3 WSW YEOMAN            40.65N 86.77W
10/11/2021                   CARROLL            IN   TRAINED SPOTTER

            TREE DAMAGE ALONG THE WHITE AND CARROLL
            COUNTY LINE. THERE WAS SOME ADDITIONAL TREE
            DAMAGE SLIGHTLY TO THE EAST. DELAYED REPORT
            FROM YESTERDAY WITH TIME ESTIMATED FROM
            RADAR.

0924 PM     TSTM WND DMG     FRANKFORT               40.28N 86.51W
10/11/2021                   CLINTON            IN   911 CALL CENTER

            1 TREE DOWNED WITH SEVERAL LARGE TREE LIMBS
            ALSO DOWNED WITHIN THE CITY LIMITS. DELAYED
            REPORT AND TIME ESTIMATED FROM RADAR.

0940 PM     TSTM WND DMG     3 E CUTLER              40.49N 86.46W
10/11/2021                   CARROLL            IN   911 CALL CENTER

            10 TREES DOWNED ACROSS THE EASTERN PORTIONS
            OF THE COUNTY WITH NO SPECIFIC LOCATION
            NOTED. DELAYED REPORT WITH TIME AND LOCATION
            ESTIMATED FROM RADAR.

Environment

Surface low pressure and its associated cold front, along with support from the upper levels, triggered the multiple lines of thunderstorms.


Figure 1: Surface Pressure and Wind at 5:00 PM EDT	Figure 2: 850mb at 5:00 PM EDT	Figure 3: 500mb at 5:00 PM EDT

CAPE and Shear


Figure 4: Mixed Layer CAPE (MLCAPE) at 5:00 PM EDT	Figure 5: 0-1km Shear at 5:00 PM EDT

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Snow in the Rockies; Showers and Thunderstorms Along the Gulf Coast; Potential Winter Storm for Northern Mid-Atlantic and Interior New England

Brief Review of the October 11 Severe Storms