Severe Storms Slam Northern Colorado with Heavy Rainfall and Large Hail

A round of severe storms developed over northern Colorado during the evening and overnight on Monday 6/18 into the early am hours on Tuesday.  Storms initiated over northern Jefferson County and Boulder County spreading out to the NE over the plains.  Hail and accumulating hail up to 3″ in Diameter pounded the NE plains with the worst hit areas being Weld and Morgan Counties.  Heavy rainfall also spawned Flash Flood Warnings from the NWS at 2-5″ or more of rain was reported.  There was heavy damage from flooding and the hail under the stronger storms some of which impacted the northern Denver Metro area and Boulder County but to a lesser degree than Weld and Morgan Counties.  Above is a hail map of some of the reports and below is is the text version of the storm reports.  This information and more can be found on the NWS Boulder page at:  https://www.weather.gov/bou/HailJune18th    

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
534 AM MDT TUE JUN 19 2018

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

1135 PM     FLASH FLOOD      2 W KEENESBURG          40.11N 104.57W
06/18/2018                   WELD               CO   EMERGENCY MNGR

            FRONTAGE ROAD AT I-76 AND WELD COUNTY RD 53
            HAS WATER FLOWING OVER ROAD AND PART OF ROAD
            IS COMPLETELY WASHED OUT. IMPASSABLE
            ROADWAYS AT WELD COUNTY RD 8 AND 45, WELD
            COUNTY RD 16 AND 63, AND HIGHWAY 52 AND WELD
            COUNTY RD 49. PARTIAL FLOODING AT I-76 AND
            WELD COUNTY RD 55.

1100 PM     HEAVY RAIN       1 ENE KEENESBURG        40.11N 104.50W
06/18/2018  M2.47 INCH       WELD               CO   COCORAHS

            2.47 INCHES OF RAIN IN PAST 40 MINUTES.

1054 PM     HAIL             4 NW BURDETT            40.40N 103.03W
06/18/2018  M1.75 INCH       WASHINGTON         CO   TRAINED SPOTTER



1033 PM     HAIL             12 S ATWOOD             40.38N 103.27W
06/18/2018  M1.75 INCH       WASHINGTON         CO   TRAINED SPOTTER

            HAIL DEPTH OF 2 INCHES ON THE HIGHWAY.

1033 PM     TSTM WND GST     12 S ATWOOD             40.38N 103.27W
06/18/2018  E60 MPH          WASHINGTON         CO   TRAINED SPOTTER



1013 PM     HAIL             WELDONA                 40.35N 103.97W
06/18/2018  M1.00 INCH       MORGAN             CO   TRAINED SPOTTER

            1.5 INCHES OF RAIN.

0957 PM     HAIL             3 ENE HILLROSE          40.34N 103.47W
06/18/2018  M1.75 INCH       WASHINGTON         CO   TRAINED SPOTTER



0939 PM     HAIL             3 NW SNYDER             40.35N 103.62W
06/18/2018  M1.50 INCH       MORGAN             CO   TRAINED SPOTTER

            HOUSE WINDOWS BROKEN.

0921 PM     HAIL             LOCHBUIE                40.01N 104.72W
06/18/2018  M1.75 INCH       WELD               CO   PUBLIC

            REPORT VIA TWITTER.

0915 PM     TSTM WND GST     FORT MORGAN AIRPORT     40.33N 103.80W
06/18/2018  M71 MPH          MORGAN             CO   AWOS



0905 PM     HAIL             1 W BRIGHTON            39.99N 104.82W
06/18/2018  M2.75 INCH       ADAMS              CO   PUBLIC

            REPORT VIA TWITTER.

0849 PM     HAIL             3 NW HENDERSON          39.95N 104.92W
06/18/2018  M2.50 INCH       ADAMS              CO   NWS EMPLOYEE



0848 PM     HAIL             3 NE NORTHGLENN         39.94N 104.93W
06/18/2018  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER



0847 PM     HAIL             3 NNE NORTHGLENN        39.94N 104.95W
06/18/2018  M2.00 INCH       ADAMS              CO   NWS EMPLOYEE



0846 PM     HAIL             1 SSW NORTHGLENN        39.89N 104.99W
06/18/2018  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER



0835 PM     HAIL             1 ENE WESTMINSTER       39.89N 105.03W
06/18/2018  M1.00 INCH       ADAMS              CO   NWS EMPLOYEE



0834 PM     HAIL             1 NW BROOMFIELD         39.93N 105.08W
06/18/2018  M1.50 INCH       BROOMFIELD         CO   NWS EMPLOYEE



0831 PM     HAIL             1 W BROOMFIELD          39.92N 105.09W
06/18/2018  M1.00 INCH       BROOMFIELD         CO   NWS EMPLOYEE



0827 PM     HAIL             2 W WESTMINSTER         39.88N 105.10W
06/18/2018  M1.00 INCH       JEFFERSON          CO   NWS EMPLOYEE



0823 PM     HAIL             2 S ROCKY FLATS         39.87N 105.20W
06/18/2018  M1.75 INCH       JEFFERSON          CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

0800 PM     HAIL             1 N ERIE                40.04N 105.04W
06/18/2018  M1.00 INCH       WELD               CO   PUBLIC

            REPORT VIA TWITTER.

0757 PM     HAIL             1 S LAFAYETTE           39.99N 105.10W
06/18/2018  M1.50 INCH       BOULDER            CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

0752 PM     HAIL             1 N LAFAYETTE           40.01N 105.10W
06/18/2018  M2.50 INCH       BOULDER            CO   TRAINED SPOTTER

            SHATTERED VEHICLE WINDSHIELDS.

0746 PM     HAIL             1 NNW LOUISVILLE        39.99N 105.15W
06/18/2018  M2.00 INCH       BOULDER            CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

0746 PM     HAIL             1 NW LAFAYETTE          40.00N 105.11W
06/18/2018  E2.00 INCH       BOULDER            CO   TRAINED SPOTTER



0745 PM     HAIL             2 WNW LAFAYETTE         40.00N 105.13W
06/18/2018  M1.00 INCH       BOULDER            CO   NWS EMPLOYEE



0743 PM     HAIL             1 NNW LOUISVILLE        39.99N 105.15W
06/18/2018  M1.75 INCH       BOULDER            CO   TRAINED SPOTTER



0740 PM     HAIL             1 NNW LOUISVILLE        39.99N 105.15W
06/18/2018  E1.25 INCH       BOULDER            CO   TRAINED SPOTTER



0739 PM     HAIL             1 NNW LOUISVILLE        39.99N 105.15W
06/18/2018  M1.00 INCH       BOULDER            CO   TRAINED SPOTTER



0731 PM     HAIL             SUPERIOR                39.93N 105.15W
06/18/2018  M3.00 INCH       BOULDER            CO   TRAINED SPOTTER



0730 PM     HAIL             1 ESE FREDERICK         40.10N 104.93W
06/18/2018  M1.50 INCH       WELD               CO   TRAINED SPOTTER



0728 PM     HAIL             2 N MARSHALL            39.98N 105.24W
06/18/2018  M1.00 INCH       BOULDER            CO   TRAINED SPOTTER



0720 PM     HAIL             3 NW MARSHALL           39.98N 105.26W
06/18/2018  M1.00 INCH       BOULDER            CO   NWS EMPLOYEE



0718 PM     HAIL             3 NNW FIRESTONE         40.16N 104.96W
06/18/2018  E1.75 INCH       WELD               CO   TRAINED SPOTTER



0711 PM     HAIL             5 NE MILTON RESERVOIR   40.29N 104.56W
06/18/2018  E1.00 INCH       WELD               CO   TRAINED SPOTTER



0700 PM     HAIL             1 NE DACONO             40.09N 104.92W
06/18/2018  M2.50 INCH       WELD               CO   NWS EMPLOYEE



0655 PM     HAIL             1 NE DACONO             40.09N 104.92W
06/18/2018  M1.75 INCH       WELD               CO   NWS EMPLOYEE



0651 PM     HAIL             FREDERICK               40.10N 104.94W
06/18/2018  M1.75 INCH       WELD               CO   TRAINED SPOTTER



0648 PM     HAIL             1 NW DACONO             40.09N 104.96W
06/18/2018  M1.00 INCH       WELD               CO   TRAINED SPOTTER



0643 PM     HAIL             1 W MEAD                40.24N 105.00W
06/18/2018  M1.75 INCH       WELD               CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

0635 PM     HAIL             4 N ERIE                40.09N 105.06W
06/18/2018  M1.00 INCH       BOULDER            CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

0632 PM     HAIL             1 NNW PLATTEVILLE       40.23N 104.83W
06/18/2018  M1.00 INCH       WELD               CO   TRAINED SPOTTER



0625 PM     HAIL             2 N LONGMONT            40.20N 105.11W
06/18/2018  M1.75 INCH       BOULDER            CO   TRAINED SPOTTER



0619 PM     HAIL             3 SSW MEAD              40.20N 105.01W
06/18/2018  M1.25 INCH       WELD               CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

0610 PM     HAIL             1 NE BOULDER            40.04N 105.24W
06/18/2018  E1.75 INCH       BOULDER            CO   PUBLIC

            REPORTED AT 3450 MITCHELL LANE, BOULDER, CO.

0610 PM     HAIL             1 NE BOULDER            40.04N 105.24W
06/18/2018  E1.75 INCH       BOULDER            CO   PUBLIC

            REPORTED AT NCAR FOOTHILLS LAB, BOULDER, CO.

0610 PM     HAIL             1 ENE BOULDER           40.00N 105.26W
06/18/2018  E1.25 INCH       BOULDER            CO   TRAINED SPOTTER



0608 PM     HAIL             2 SSW BOULDER           40.00N 105.27W
06/18/2018  M1.50 INCH       BOULDER            CO   TRAINED SPOTTER



0600 PM     HAIL             2 SSW BOULDER           40.00N 105.26W
06/18/2018  M1.00 INCH       BOULDER            CO   EMERGENCY MNGR



0558 PM     HAIL             4 WNW BOULDER           40.04N 105.32W
06/18/2018  M1.00 INCH       BOULDER            CO   PUBLIC

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