Alert archive / Colorado / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 68, NWS Denver/Boulder, CO

June 20, 2001Elbert County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 20, 2001, 9:11 PM MDT for Elbert County, Colorado. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 20, 2001, 9:11 PM MDT (03:11 UTC)
Expired: Jun 20, 2001, 9:40 PM MDT
In force: 29 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties

County Elbert County, CO

The radar

The Denver radar (KFTG), 66 km from the middle of the area, began a volume at 03:10 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

Denver, CO (KDNR), launched 00:00Z, 3.2 hours before the alert went out and 101 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 484 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1925 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -40 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KBOU 210312
SVRDEN

COC039-210340-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
911 PM MDT WED JUN 20 2001

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ELBERT COUNTY IN EAST CENTRAL COLORADO

* UNTIL 940 PM MDT

* AT 911 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 17 MILES WEST OF MATHESON...OR ABOUT 33 MILES
  WEST OF LIMON...MOVING SOUTH AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...MATHESON.

LARGE HAIL IS STILL LIKELY FROM THIS STORM UNTIL IT MOVES SOUTH OF 
ELBERT COUNTY.  


LAT...LON 3916 1044`5 3914 10403 3902 10403 3901 10374
          3924 10376 3928 10457

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 20, 3:00 PM MDT, 6 hours 11 minutes earlier.

Area forecast discussion, Jun 20, 3:00 PM MDT, 6 hours 11 minutes before

NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER COLORADO
300 PM MDT WED JUN 20 2001

SHORT TERM DISCUSSION: STORMS HV YET TO FIRE WITHIN THE DEN CWFA AS
OF 2030Z.  PLENTY OF LOW-LVL MOISTURE AROUND WITH SFC-700 THETA-E
RIDGE PUSHED UP AGAINST THE FNT RNG FTHLS AND SFC DWPTS IN THE
LOW/MID 50S.  LATEST ACARS...MM5 AND ETA SOUNDINGS SHOW AIR OVR NERN
CO CAPPED NR 700 MB LVL.  HWVR APRS JUST ANOTHER DEG OR TWO BEFORE
AIR WEST OF CHEYENNE TO LIMON LINE REACHES ITS CNVCTV TEMP
THRESHOLD.  MM5 AND ETA SHOW 0-3KM CAPES IN THE 600-1500 J/KG RANGE
FM 21Z-00Z EITHER SIDE OF THETA-E AXIS WITH GREATEST VALUES OVR
EASTERN ADAMS CTY SOUTHEASTWARD ACRS ELBERT AND LINCOLN CTYS.
HELICITY VALUES WITHIN THIS REGION ALSO LOOK PRETTY RESPECTABLE WITH
VALUES UP AROUND 225 M2/S2 ALONG I-70 CORRIDOR EAST OF DEN.  WHEREAS
IN THE FAR NORTHEAST AIR JUST STABLE FOR ANYTHING MORE THAN A FEW
LGT SHWRS WHERE SKIES MSTLY CLDY/OVERCAST FOR MOST OF THE DAY AND
AFTN TEMPS ONLY IN THE MID/UPR 60S.  REGARDING RISK FOR SVR...APRS
HAIL AND ISOLD TORNADOES MAIN CONCERN PRINCIPALLY ALONG WIND SHEAR
BOUNDARY CURRENTLY EXTENDING ACRS ARAPAHOE...SWRN WASHINGTON AND
LINCOLN CTYS.  SPC JUST ISSUED A TORNADO WATCH FOR THIS GENERAL
AREA.  LASTLY...JET MAX DARTING SEWRD ACRS S-CNTRL WY ATTM WILL BE
MECHANISM THAT SHOULD FIRE OFF STORMS ACRS ALONG THETA-E AXIS NEXT
HR OR SO.  ETA 6-HR QPF AMTS IN THE 0.20 TO .45 INCH RANGE...WITH
HIGHEST AMTS ALONG AND NEAR THE SRN FTHLS AND OVR THE MONUMENT RIDGE
S AND SE OF THE DEN METRO AREA.  ONCE STORMS DIE DOWN LATER THIS EVE
SHOULD SEE SKIES ACRS NERN PLAINS REMAINING PARTLY/MOSTLY CLOUDY
WITH PERSISTANCE OF LGT ELY LOW-LVL FLOW AS SFC HIGH SLIPS SEWRD
ACRS SD AND NE.  FOG AGAIN A GOOD BET IN NERN ZONES.

THURSDAY...MDLS NOT AS EAGER TO FLUSH OUT LOW LVL MOISTURE ON NERN
PLAINS WITH BNDRY LYR WINDS STAYING E-SELY FOR MOST OF THE DAY.  STG
HEATING AND WK MID-LVL FORCING SHOULD BE ENOUGH TO GENERATE ISOLD
LATE DAY T-STORMS IN THE URBAN CORRIDOR/ADJACENT PLAINS...WITH SCT
STORMS IN THE FTHLS.  MOS GUIDANCE SHOWING A 5 TO 10 DEG WARMUP ON
THE PLAINS THURSDAY...WITH LTL TEMP CHANGE IN THE MTNS.  THIS LOOKS
GOOD.

LONG TERM DISCUSSION:  AIRMASS DRIES OUT ON FRI AS PER MEDIUM RANGE
MODELS WITH UPR RIDGE BUILDING OVR THE GREAT BASIN PUTTING AREA
UNDER DRIER NWLY FLOW ALOFT.  SHOULD SEE AFTN TEMPS ON THE PLAINS
HOOVERING AROUND 90 ON SAT.  BY SUN MRF AND CANADIAN GLOBAL MODELS
SHOW RIDGE MOVG OFF TO THE EAST WITH FLOW ALOFT GOING SWLY.  BOTH
MODELS HINT AT AN INCREASE IN MID-LVL MOISTURE ORIGINATING FM THE
DESERT SOUTHWEST...POSSIBLY EARLY STAGES OF THE SUMMER MONSOON.  SEE
LTL CHANGE IN TEMP THROUGH THE PERIOD.  BAKER

.DEN...NONE.

In the hours before

Local storm report, Jun 20, 7:55 PM MDT, 1 hour 16 minutes before

LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
755 PM MDT WED JUN 20 2001

...PRELIMINARY STORM REPORT FOR JUNE 09 2001...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    3 E MEADE                 CO   1.75 INCH HAIL
06/20/01   WELD

0710 PM    25 S LIMON                CO   1.0 INCH HAIL

0716 PM    1/2 E BRIGHTON            CO   TORNADO
06/20/01   WELD

0720 PM    LOCHBUIE                  CO   2.0 INCH HAIL
06/20/01   WELD

0725 PM    4 N DENVER INTL AIRPORT   CO   TORNADO
06/20/01   ADAMS

0745 PM    WATKINS                   CO   60 MPH WIND GUST
06/20/01   ADAMS

0758 PM    WATKINS                   CO   3.0 INCH HAIL
06/20/01   ADAMS

BENTON

Local storm report, Jun 20, 8:26 PM MDT, 45 minutes before

LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
755 PM MDT WED JUN 20 2001

...PRELIMINARY STORM REPORT FOR JUNE 09 2001...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    3 E MEADE                 CO   1.75 INCH HAIL
06/20/01   WELD

0710 PM    25 S LIMON                CO   1.0 INCH HAIL

0716 PM    1/2 E BRIGHTON            CO   TORNADO
06/20/01   WELD

0720 PM    LOCHBUIE                  CO   2.0 INCH HAIL
06/20/01   WELD

0725 PM    4 N DENVER INTL AIRPORT   CO   TORNADO
06/20/01   ADAMS

0P745 PM    WATKINS                   CO   60 MPH WIND GUST
06/20/01   ADAMS

0758 PM    WATKINS                   CO   3.0 INCH HAIL
06/20/01   ADAMS

BENTON

Local storm report, Jun 20, 8:35 PM MDT, 36 minutes before

LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE DENVER CO
835 PM MDT WED JUN 20 2001

...PRELIMINARY STORM REPORT FOR JUNE 09 2001...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    3 E MEADE                 CO   1.75 INCH HAIL
06/20/01   WELD

0710 PM    25 S LIMON                CO   1.0 INCH HAIL
06/20/01   LINCOLN

0716 PM    1/2 E BRIGHTON            CO   TORNADO
06/20/01   WELD

0720 PM    LOCHBUIE                  CO   2.0 INCH HAIL
06/20/01   WELD

0725 PM    4 N DENVER INTL AIRPORT   CO   TORNADO
06/20/01   ADAMS

0745 PM    WATKINS                   CO   60 MPH WIND GUST
06/20/01   ADAMS

0750 PM    BENNETT                   CO   0.75 INCH HAIL
06/20/01   ADAMS

0758 PM    WATKINS                   CO   3.0 INCH HAIL
06/20/01   ADAMS

BENTON

Local storm report, Jun 20, 8:45 PM MDT, 26 minutes before

LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE DENVER CO
845 PM MDT WED JUN 20 2001

...PRELIMINARY STORM REPORT FOR JUNE 09 2001...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    3 E MEADE                 CO   1.75 INCH HAIL
06/20/01   WELD

0710 PM    25 S LIMON                CO   1.0 INCH HAIL
06/20/01   LINCOLN

0716 PM    1/2 E BRIGHTON            CO   TORNADO
06/20/01   WELD

0720 PM    LOCHBUIE                  CO   2.0 INCH HAIL
06/20/01   WELD

0725 PM    4 N DENVER INTL AIRPORT   CO   TORNADO
06/20/01   ADAMS

0745 PM    WATKINS                   CO   60 MPH WIND GUST
06/20/01   ADAMS

0750 PM    BENNETT                   CO   0.75 INCH HAIL
06/20/01   ADAMS

0758 PM    WATKINS                   CO   3.0 INCH HAIL
06/20/01   ADAMS

0832 PM    8 NE KIOWA                CO   1.75 INCH HAIL
06/20/01   ELBERT

0839 PM    14 E ELIZABETH            CO   1.00 INCH HAIL
06/20/01   ELBERT                    WIND DAMAGE TO BARN

BENTON

z

Local storm report, Jun 20, 8:56 PM MDT, 15 minutes before

LOCAL STORM REPORT...UPDATED
NATIONAL WEATHER SERVICE DENVER CO
856 PM MDT WED JUN 20 2001

...PRELIMINARY STORM REPORT FOR JUNE 09 2001...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    3 E MEADE                 CO   1.75 INCH HAIL
06/20/01   WELD

0710 PM    25 S LIMON                CO   1.0 INCH HAIL
06/20/01   LINCOLN

0716 PM    1/2 E BRIGHTON            CO   TORNADO
06/20/01   WELD

0720 PM    LOCHBUIE                  CO   2.0 INCH HAIL
06/20/01   WELD

0725 PM    4 N DENVER INTL AIRPORT   CO   TORNADO
06/20/01   ADAMS

0745 PM    WATKINS                   CO   60 MPH WIND GUST
06/20/01   ADAMS

0750 PM    BENNETT                   CO   0.75 INCH HAIL
06/20/01   ADAMS

0758 PM    WATKINS                   CO   3.0 INCH HAIL
06/20/01   ADAMS

0805 PM    9 S BENNETT               CO   0.75 INCH HAIL
06/20/01   ARAPAHOE

0829 PM    WATKINS                   CO   2.5 ICH HAIL
06/20/01   ADAMS

0832 PM    8 NE KIOWA                CO   1.75 INCH HAIL
06/20/01   ELBERT

0839 PM    14 E ELIZABETH            CO   1.0 INCH HAIL
06/20/01   ELBERT                    WIND DAMAGE TO BARN

BENTON

Local storm report, Jun 20, 9:00 PM MDT, 11 minutes before

LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
900 PM MDT WED JUN 20 2001

...PRELIMINARY STORM REPORT FOR JUNE 09 2001...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0645 PM    3 E MEADE                 CO   1.75 INCH HAIL
06/20/01   WELD

0710 PM    25 S LIMON                CO   1.0 INCH HAIL
06/20/01   LINCOLN

0716 PM    1/2 E BRIGHTON            CO   TORNADO
06/20/01   WELD

0720 PM    LOCHBUIE                  CO   2.0 INCH HAIL
06/20/01   WELD

0725 PM    4 N DENVER INTL AIRPORT   CO   TORNADO
06/20/01   ADAMS

0745 PM    WATKINS                   CO   60 MPH WIND GUST
06/20/01   ADAMS

0750 PM    BENNETT                   CO   0.75 INCH HAIL
06/20/01   ADAMS

0758 PM    WATKINS                   CO   3.0 INCH HAIL
06/20/01   ADAMS

0805 PM    9 S BENNETT               CO   0.75 INCH HAIL
06/20/01   ARAPAHOE

0829 PM    WATKINS                   CO   2.5 ICH HAIL
06/20/01   ADAMS

0832 PM    8 NE KIOWA                CO   1.75 INCH HAIL
06/20/01   ELBERT

0839 PM    14 E ELIZABETH            CO   1.0 INCH HAIL
06/20/01   ELBERT                         WIND DAMAGE TO BARN

BENTON

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 6:25 PM MDT	Tornado Warning	BOU	Lincoln	35 min
Jun 20, 6:32 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Jun 20, 7:02 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver	43 min
Jun 20, 7:02 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Jun 20, 7:11 PM MDT	Tornado Warning	BOU	Adams, Denver	34 min
Jun 20, 7:15 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	45 min
Jun 20, 7:32 PM MDT	Tornado Warning	BOU	Adams, Arapahoe, Denver	28 min
Jun 20, 7:47 PM MDT	Tornado Warning	BOU	Adams, Arapahoe, Denver	33 min
Jun 20, 8:08 PM MDT	Tornado Warning	BOU	Arapahoe, Elbert	37 min
Jun 20, 8:33 PM MDT	Tornado Warning	BOU	Elbert	37 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2001 Every severe thunderstorm warning in 2001

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.