Alert archive / Colorado / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 57, NWS Denver/Boulder, CO

June 16, 2004Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 16, 2004, 5:34 PM MDT for Washington County, Colorado. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 16, 2004, 5:34 PM MDT (23:34 UTC)
Expired: Jun 16, 2004, 6:15 PM MDT
In force: 41 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Washington County, CO

The radar

The Denver radar (KFTG), 100 km from the middle of the area, began a volume at 23:36 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.6 hours before the alert went out and 22 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: 55 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KBOU 162334
SVRBOU
COC121-170015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
533 PM MDT WED JUN 16 2004

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO
  THIS INCLUDES THE CITY OF AKRON

* UNTIL 615 PM MDT

* AT 533 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 21 MILES WEST OF ELBA...OR ABOUT 25 MILES
  SOUTHWEST OF AKRON...MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...AKRON AND
ELBA.

HAIL UP TO DIME SIZE WAS BEEN REPORTED AT SHAMROCK IN EASTERN ADAMS 
COUNTY AT 515 PM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR 
IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

THIS WARNING REPLACES THE EARLIER WARNING FOR EASTERN ADAMS AND WEST 
CENTRAL WASHINGTON COUNTY.

LAT...LON 4001 10359 3989 10355 3988 10306 4021 10309
          4007 10348 4001 10348

$$

GIMMESTAD

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 16, 2:10 PM MDT, 3 hours 24 minutes earlier.

Area forecast discussion, Jun 16, 2:10 PM MDT, 3 hours 24 minutes before

AREA FORECAST DISCUSSION...CORRECTION
NATIONAL WEATHER SERVICE DENVER CO
210 PM MDT WED JUN 16 2004

CORRECTED WORDING

.SHORT TERM...LOTS OF CONVECTION HAS DEVELOPED IN THE MOUNTAINS THIS
AFTERNOON AND IS NOW SPREADING EASTWARD ACROSS THE PLAINS.
VIRTUALLY NO SURFACE BASED CAPE ACROSS THE CWA EXCEPT IN THE FAR
SOUTHERN SECTIONS FROM PARK COUNTY TOWARD SOUTHERN LINCOLN COUNTY.
HOWEVER...THE CONVECTION SHOULD LAST AS IT SPREADS ACROSS THE PLAINS
WITH A FEW HUNDRED J/KG OF ELEVATED CAPE ABOVE THE STABLE LAYER AND
UPPER LEVEL FORCING UNDER RIGHT REAR ENTRANCE REGION OF UPPER JET.
WILL MAINTAIN THE LIKELY POPS THIS EVENING. SOME THREAT OF SEVERE
WEATHER REMAINS IN AREAS FROM PARK COUNTY EASTWARD THROUGH SOUTHERN
LINCOLN COUNTY WHERE THERE IS A GREATER THREAT OF STORMS ADVECTING
IN FROM HIGHER CAPE AREAS TO THE SOUTH.  WHILE STRATUS MAY ATTEMPT
TO BREAK UP FROM MIXING ASSOCIATED WITH SHOWERS/STORMS...EXPECT IT
TO FILL BACK IN QUITE EFFICIENTLY AS LOWS LEVEL EAST/SOUTHEAST FLOW
REMAINS IN PLACE AND DENVER CYCLONE DEVELOPS.  WILL CARRY SOME FOG
AND DRIZZLE IN THE OVERNIGHT AND EARLY MORNING HOURS THURSDAY.  BY
THURSDAY AFTERNOON...EXPECT TO SEE ANOTHER ROUND OF CONVECTION
DEVELOP OVER THE MOUNTAINS AND SPREAD EAST ACROSS THE PLAINS.
THREAT OF SEVERE DEPENDS ON WHETHER LOW LEVEL STRATUS BREAKS UP.  AT
THIS TIME...FLOW REGIME SUGGESTS HIGHEST THREAT AREA WILL BE FROM
DENVER SOUTHWARD THROUGH THE PALMER DIVIDE AREA.

.LONG TERM DISCUSSION...MODELS CONTINUE TO OSCILLATE FROM RUN TO RUN
WITH THE TIMING THE PASSAGE OF SHORTWAVES AND SFC FRONTAL SYSTEMS
CONTINUING TO BE A CHALLENGE. POTENTIAL FOR SEVERE T-STORMS FRIDAY
NOT LOOKING AS GOOD NOW WITH ATMOSPHERE EAST OF THE MTNS LOOKING
DRIER AND LESS UNSTABLE. WILL ADJUST ZONES ACCORDINGLY. OTHERWISE...
WILL MAKE ONLY MINOR ADJUSTMENTS TO THE GFE FIELDS SINCE CONFIDENCE
STEADILY DECREASES IN THE MODELS OUT BEYOND FRIDAY.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...NONE.

BARJENBRUCH/BAKER

Hazardous weather outlook, Jun 16, 10:47 AM MDT, 6 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
1047 AM MDT WED JUN 16 2004

COZ030>051-171200-
JACKSON COUNTY BELOW 9000 FEET-WEST JACKSON AND WEST GRAND
COUNTIES ABOVE 9000 FEET-GRAND AND SUMMIT COUNTIES BELOW 9000
FEET-SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-SOUTH AND SOUTHEAST
GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/GILPIN/CLEAR CREEK/
SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET-LARIMER AND
BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-JEFFERSON AND WEST
DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK
COUNTIES BELOW 9000 FEET-CENTRAL AND SOUTHEAST PARK COUNTY-LARIMER
COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-BOULDER AND JEFFERSON
COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY-NORTH DOUGLAS
COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/
EAST BROOMFIELD COUNTY-ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES
ABOVE 6000 FEET-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD
COUNTY-MORGAN COUNTY-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN
COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS
COUNTY-
1047 AM MDT WED JUN 16 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL BECOME MORE WIDESPREAD ACROSS
NORTHEAST AND NORTH CENTRAL COLORADO THIS AFTERNOON AND EVENING.
ALTHOUGH THE ATMOSPHERE HAS STABILIZED...A SEVERE THUNDERSTORM CANT
BE RULED OUT ACROSS THE FAR SOUTHERN PORTION OF THE FORECAST AREA.
THIS INCLUDES LOCATIONS FROM PARK AND SOUTHERN JEFFERSON COUNTIES
EASTWARD THROUGH THE PALMER DIVIDE AREA INTO SOUTHERN LINCOLN
COUNTY.  THE MAIN THREAT FROM A SEVERE STORM TODAY WOULD BE LARGE
HAIL.  MOST OTHER STORMS TODAY WILL PRODUCE MODERATE TO HEAVY RAIN
AND ONLY SMALL HAIL.

AN UPPER LEVEL DISTURBANCE MOVING ACROSS THE REGION AND UPSLOPE FLOW
EAST OF THE CONTINENTAL DIVIDE WILL PROVIDE THE BETTER CHANCE OF
SHOWERS AND THUNDERSTORMS THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A MOIST AND UNSTABLE AIRMASS...COMBINED WITH THE PASSAGE OF A WEAK
UPPER AIR DISTURBANCE WILL INCREASE THE CHANCE FOR AFTERNOON AND
EVENING THUNDERSTORMS ON THE PLAINS AND FOOTHILLS. THUNDERSTORMS ON
THE PLAINS MAY APPROACH SEVERE LIMITS LATE IN THE DAY. FRIDAY
THROUGH TUESDAY...THERE WILL BE A SLIGHT CHANCE OF AFTERNOON AND
EVENING THUNDERSTORMS EACH DAY WITH THE BEST CHANCE ON MONDAY WITH
PASSAGE OF A WEAK COLD FRONT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED IN THE PALMER DIVIDE AREA BY 1 PM.

BARJENBRUCH/BAKER

In the hours before

Local storm report, Jun 16, 3:05 PM MDT, 2 hours 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
305 PM MDT WED JUN 16 2004

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

0302 PM     HAIL             ROXBOROUGH PARK         39.44N 105.07W
06/16/2004  0.75 INCH        DOUGLAS            CO   CO-OP OBSERVER

&&

RAY

Local storm report, Jun 16, 4:24 PM MDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
424 PM MDT WED JUN 16 2004

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

0326 PM     HAIL             CASTLE PINES            39.43N 104.90W
06/16/2004  1.00 INCH        DOUGLAS            CO   AMATEUR RADIO

0302 PM     HAIL             ROXBOROUGH PARK         39.44N 105.07W
06/16/2004  0.75 INCH        DOUGLAS            CO   CO-OP OBSERVER

&&

RAY

Local storm report, Jun 16, 4:26 PM MDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT ... CORRECTION
NATIONAL WEATHER SERVICE DENVER CO
426 PM MDT WED JUN 16 2004

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

0326 PM     HAIL             CASTLE PINES            39.43N 104.90W
06/16/2004  1.00 INCH        DOUGLAS            CO   PUBLIC

0302 PM     HAIL             ROXBOROUGH PARK         39.44N 105.07W
06/16/2004  0.75 INCH        DOUGLAS            CO   CO-OP OBSERVER

&&

RAY

Local storm report, Jun 16, 4:50 PM MDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
450 PM MDT WED JUN 16 2004

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

0440 PM     HAIL             21 N ORDWAY             38.52N 103.76W
06/16/2004  1.00 INCH        LINCOLN            CO   CO-OP OBSERVER

0326 PM     HAIL             CASTLE PINES            39.43N 104.90W
06/16/2004  1.00 INCH        DOUGLAS            CO   PUBLIC

0302 PM     HAIL             ROXBOROUGH PARK         39.44N 105.07W
06/16/2004  0.75 INCH        DOUGLAS            CO   CO-OP OBSERVER

&&

RAY

Local storm report, Jun 16, 5:23 PM MDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
523 PM MDT WED JUN 16 2004

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

0516 PM     HAIL             5 E PUNKIN CENTER       38.85N 103.61W
06/16/2004  0.75 INCH        LINCOLN            CO   TRAINED SPOTTER

0515 PM     HAIL             1 SSW SHAMROCK          39.87N 103.83W
06/16/2004  0.75 INCH        ADAMS              CO   TRAINED SPOTTER

0440 PM     HAIL             21 N ORDWAY             38.52N 103.76W
06/16/2004  1.00 INCH        LINCOLN            CO   CO-OP OBSERVER

0326 PM     HAIL             CASTLE PINES            39.43N 104.90W
06/16/2004  1.00 INCH        DOUGLAS            CO   PUBLIC

0302 PM     HAIL             ROXBOROUGH PARK         39.44N 105.07W
06/16/2004  0.75 INCH        DOUGLAS            CO   CO-OP OBSERVER

&&

RAY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 6:01 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	44 min
Jun 15, 6:10 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Sedgwick	50 min
Jun 15, 6:58 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Sedgwick	62 min
Jun 15, 7:31 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Sedgwick	29 min
Jun 15, 7:59 PM MDT	Severe Thunderstorm Warning	BOU	Phillips, Sedgwick	61 min
Jun 16, 2:44 PM MDT	Severe Thunderstorm Warning	BOU	Douglas, Jefferson	46 min
Jun 16, 3:25 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas	40 min
Jun 16, 4:36 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	54 min
Jun 16, 4:55 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Washington	50 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2004 Every severe thunderstorm warning in 2004

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.