National Weather Service United States Department of Commerce

Excessive Heat to Continue for Washington State; Flooding Impacts Expected in the Southwest U.S.

Excessive heat will continue over portions of central Washington Friday with afternoon temperatures into the 100s. In the Desert Southwest, monsoon activity will continue to generate localized flash flooding impacts in arroyos, slot canyons, and urban areas, as well as rapid rises on rivers, through this weekend. Flood Watches are widespread across Arizona, and New Mexico into far west Texas. Read More >

Overview

A potent cold front combined with energy crossing the region aloft to allow a widespread area of showers and thunderstorms to develop late Sunday night through early Monday morning. Some wind damage and minor flooding occurred, along with two EF1 tornadoes.

Image
EF1 Tornado Damage at a Mobile Home Park in Stamping Ground, KY

Radar

Several waves of thunderstorms affected the region last night, bringing moderate to occasionally heavy rainfall as well as plenty of lightning.  Winds generally topped out in the 40-50 mph range, but a few spots saw higher amounts, with several reports of trees down across the region.  In addition, an EF1 tornado quickly developed over Stamping Ground, KY.  Radar imagery below did not show the typical pattern of a tornado across the region. 

Radar Image Radar Image Radar Image Radar Image
Radar Loop Through the Event Reflectivity at 522 AM EST, Approx time of tornado touchdown Storm minus Relative Motion not showing a big signal for a tornado Correlation Coefficient, also not showing signs of tornadic debris

Storm Reports


PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE LOUISVILLE KY
248 PM EST MON DEC 6 2021

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

0100 AM     TSTM WND DMG     1 N LEBANON             37.58N 85.25W
12/06/2021                   MARION             KY   911 CALL CENTER  

            TREES AND WIRES DOWN ACROSS BOLDRICK AVE 
            NEAR WOODLAWN AVE. TIME APPROXIMATED FROM 
            RADAR. 

0105 AM     TSTM WND DMG     3 ENE LEBANON           37.58N 85.21W
12/06/2021                   MARION             KY   911 CALL CENTER  

            TREE PARTIALLY BLOCKING ROAD AT SHORT LINE 
            PIKE NEAR 68E. TIME ESTIMATED FROM RADAR. 
            ALSO REPORTED A TREE ACROSS THE ROAD AT HOOD 
            LANE OFF FAIRGROUNDS ROAD...SIMILAR TIME. 

0127 AM     TSTM WND DMG     1 W PARKSVILLE          37.60N 84.91W
12/06/2021                   BOYLE              KY   911 CALL CENTER  

            TREES DOWN ON TANK POND ROAD. TIME 
            APPROXIMATED FROM RADAR. 

0136 AM     TSTM WND DMG     1 NNW DANVILLE          37.65N 84.78W
12/06/2021                   BOYLE              KY   911 CALL CENTER  

            TREE DOWN NEAR INTERSECTION OF HIGH STREET 
            AND FIFTH STREET. TIME ESTIMATED FROM RADAR. 

0139 AM     TSTM WND DMG     2 WNW JUNCTION CITY     37.60N 84.82W
12/06/2021                   BOYLE              KY   911 CALL CENTER  

            TREES DOWN ON YATES ROAD OFF HWY 300. TIME 
            ESTIMATED FROM RADAR. DISPATCHER ALSO 
            REPORTED HIGH WATER THERE. 

0139 AM     TSTM WND DMG     4 ENE DANVILLE          37.67N 84.71W
12/06/2021                   BOYLE              KY   911 CALL CENTER  

            TREES DOWN. TIME ESTIMATED FROM RADAR. 

0312 AM     TSTM WND GST     LOUISVILLE BOWMAN FIELD 38.22N 85.67W
12/06/2021  M46 MPH          JEFFERSON          KY   ASOS             

            A PEAK WIND GUST OF 46MPH WAS MEASURED AT 
            THE LOUISVILLE BOWMAN FIELD ASOS STATION. 

0415 AM     TSTM WND GST     2 WSW FRANKFORT         38.18N 84.90W
12/06/2021  M49 MPH          FRANKLIN           KY   ASOS             

            THE FRANKFORT ASOS STATION MEASURED 49MPH AS 
            A PEAK WIND GUST. 

0422 AM     TORNADO          STAMPING GROUND         38.27N 84.68W
12/06/2021                   SCOTT              KY   NWS STORM SURVEY 

            *** 2 INJ *** 
            AN EF1 TORNADO WITH PEAK WINDS AROUND 95 MPH 
            BRIEFLY TOUCHED IN STAMPING GROUND. IT WAS 
            ON THE GROUND FOR A QUARTER OF A MILE WITH A 
            MAXIMUM WIDTH OF 60 YARDS. IT CAUSED DAMAGE 
            TO MULTIPLE MOBILE HOMES AND TREES AS WELL 
            AS OUTBUILDINGS. 

0425 AM     TSTM WND DMG     2 E STAMPING GROUND     38.27N 84.65W
12/06/2021                   SCOTT              KY   NWS STORM SURVEY 

            NWS STORM SURVEY FOUND STRAIGHT-LINED WIND 
            DAMAGE PEAKING AT 80 MPH IN AN AREA ROUGHLY 
            A QUARTER OF A MILE BY A THIRD OF A MILE. 
            DAMAGE WAS CONCENTRATED ALONG DUVALL STATION 
            RD. SEVERAL TREES WERE DOWNED AND A WELL 
            CONSTRUCTED BARN HAD ITS ROOF PANELS RIPPED 
            OFF AND DOORS BLOWN IN. SHINGLES FROM 2 
            RESIDENCES ALSO WERE THROWN A HUNDRED YARDS. 

0446 AM     TSTM WND GST     6 W LEXINGTON           38.04N 84.61W
12/06/2021  M46 MPH          FAYETTE            KY   ASOS             

            LEX ASOS. 

0551 AM     TSTM WND DMG     2 E OLMSTEAD            36.75N 86.97W
12/06/2021                   LOGAN              KY   911 CALL CENTER  

            DISPATCH REPORTED A TREE ACROSS OLD VOLNEY 
            RD. TIME APPROXIMATED FROM RADAR. 

0621 AM     TSTM WND DMG     1 E LANCASTER           37.62N 84.56W
12/06/2021                   GARRARD            KY   911 CALL CENTER  

            TREES DOWN ON WESLEY RD. AREA HAD THREE 
            ROUNDS OF STORMS FROM 1 TO 7 AM. ESTIMATED 
            THE LAST WAVE CAUSED THIS DAMAGE. 

0627 AM     TSTM WND DMG     1 SSE CAMPBELLSVILLE    37.33N 85.34W
12/06/2021                   TAYLOR             KY   EMERGENCY MNGR   

            POWER POLE AND LINES DOWN ON LINCOLN AVE AT 
            RED LANE. TIME ESTIMATED FROM RADAR. 

0630 AM     TSTM WND DMG     3 WNW OXFORD            38.29N 84.58W
12/06/2021                   SCOTT              KY   COUNTY OFFICIAL  

            POWERLINES ARE DOWN AROUND SCOTT COUNTY, KY. 
            DUE TO THIS, THE SCOTT COUNTY SCHOOLS HAVE 
            BEEN CLOSED FOR TODAY. 

0630 AM     FLOOD            1 NNW DANVILLE          37.66N 84.78W
12/06/2021                   BOYLE              KY   911 CALL CENTER  

            DISPATCHER REPORTED HIGH WATER AT MAPLE AVE 
            AT THE RAILROAD UNDERPASS. ALSO ON E MAIN ST 
            NEAR STANFORD RD. 

0700 AM     FLOOD            GRAVEL SWITCH           37.58N 85.05W
12/06/2021                   MARION             KY   911 CALL CENTER  

            DISPATCHERS REPORTED EARLIER THAT WATER WAS 
            ACROSS A GOOD PORTION OF THE ROAD AT HIGHWAY 
            243. ALSO A REPORT OF WATER AT INTERSECTION 
            OF HARDIN AND CHANDLER AND IN HAMILTON 
            HEIGHTS IN LEBANON, NEAR HARDIN CREEK. 

0700 AM     TSTM WND DMG     3 E PREACHERSVILLE      37.54N 84.50W
12/06/2021                   GARRARD            KY   911 CALL CENTER  

            TREES DOWN AT FALL LICK RD AND DRAKES CREEK 
            RD. TIME ESTIMATED FROM RADAR. 

0715 AM     TSTM WND DMG     3 NW WINDSOR            37.16N 84.96W
12/06/2021                   CASEY              KY   TRAINED SPOTTER  

            NEARBY KY MESONET STATIONS GUSTED 40MPH 
            CAUSING MANY SNAPPED PINE TREES NEAR 
            DUNNVILLE, KY. 

0800 AM     FLOOD            1 ESE CAMPBELLSVILLE    37.35N 85.33W
12/06/2021                   TAYLOR             KY   EMERGENCY MNGR   

            ALLEN STREET NEAR BUCK HORN CREEK IS CLOSED 
            DUE TO FLOODING. OTHER ROADS IN THE COUNTY, 
            INCLUDING BEAR TRACK RD, PALESTINE RD, 
            FAIRVIEW RD, AND SALEM CHURCH RD ARE ALSO 
            CLOSED DUE TO MINOR FLOODING. MOST ARE 
            TYPICALLY FLOOD PRONE LOCATIONS. 

Rain Reports


Environment

Synoptic Overview

Environment Environment Environment

Figure 1: 500 mb upper air chart

09z December 6, 2021

Figure 2: 850 mb upper air chart

09z December 6, 2021

Figure 3: WPC's Surface Analysis Data 

09z December 6, 2021


Near-storm Environment

Environment Environment Environment

Figure 4: Effective Bulk Shear

09z December 6, 2021

Figure 5: 0-500 m Storm Relative Helicity (SRH)

09z December 6, 2021

Figure 6: Mixed Layer CAPE

09z December 6, 2021


Additional Environmental Data

Environment Environment Environment

Figure 7: Modified SHERBE

09z December 6, 2021

Figure 8: SHERBE

09z December 6, 2021

Figure 9: Low-Level Lapse Rates

08z December 6, 2021


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