Severe Thunderstorm Warning 23, NWS Denver/Boulder, CO

Issued

Jun 21, 2002, 5:22 PM MDT (23:22 UTC)

Expired

Jun 21, 2002, 6:00 PM MDT

In force

38 min

Issued by

NWS Denver/Boulder, CO

Area

Counties, with a storm outline in the text

Counties Adams County, CO, Weld County, CO

The Denver radar (KFTG), 33 km from the middle of the area, began a volume at 23:21 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.

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.

000 
WUUS55 KBOU 212322
SVRDEN
COC001-123-220000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
521 PM MDT FRI JUN 21 2002

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL ADAMS COUNTY IN NORTHEAST COLORADO
  SOUTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 600 PM MDT

* AT 521 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR KEENESBURG...OR ABOUT 24 MILES            
  SOUTHEAST OF GREELEY...MOVING NORTH AT 15 MPH.  THIS STORM COULD   
  PRODUCE WIND GUSTS TO 70 MPH AND HAIL TO ONE INCH IN DIAMETER.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...HUDSON...
KEENESBURG...MILTON RESERVOIR...PROSPECT VALLEY AND ROGGEN.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3993 10470 3992 10436 4032 10429 4032 10469

KLEYLA

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 2:45 PM MDT, 2 hours 37 minutes earlier.

NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER COLORADO
245 PM MDT FRI JUN 21 2002

SHORT TERM DISCUSSION:  CURRENT RADAR PICTURES ARE INDICATING
ISOLATED SHOWERS COVERAGE OVER THE MOUNTAIN AND FOOTHILLS
AREAS...INCLUDING THE HAYMAN FIRE.   THE RADAR IS INDICATING A
BOUNDARY ACROSS THE PLAINS JUST EAST OF THE DENVER METRO AREA
PUSHING NORTHWESTWARD.  SOME CONVECTION IS DEVELOPING ALONG THIS
BOUNDARY.   WILL KEEP WITH 10-20% ON THE POPS IN ALL AREAS.
OVERNIGHT...GRIDS SHOW SKIES TO BE PARTLY CLOUDY TONIGHT AND THE
SATELLITE PICTURES CONCUR SOMEWHAT.  WILL MAKE SURE TEMPERATURES ARE
WARM ENOUGH.  THE SOUTHWESTERLY FLOW ALOFT INCREASES A BIT OVERNIGHT
INTO MID DAY SATURDAY AS THE UPPER TROUGH OVER THE GREAT BASIN
WEAKENS AND PUSHES NORTHEASTWARD TO THE NORTH OF THE FORECAST AREA.
THE DIV-Q GRIDS SHOW WEAK SYNOPTIC SCALE ASCENT FROM THIS EVENING
INTO SATURDAY ABOUT EARLY AFTERNOON.  SOME MID LEVEL MOISTURE WILL
BE AROUND BUT THERE IS LITTLE LOW LEVEL MOISTURE TO DEAL WITH...NO
POPS OVER THE PLAINS FOR SATURDAY...BUT WILL KEEP ISOLATED GOING
IN THE MOUNTAINS.

LONG TERM DISCUSSION:  BY SATURDAY NIGHT...THE UPPER TROUGH/CLOSED
LOW PUSHES EASTWARD WELL NORTH OF THE FORECAST AREA WITH WEAK ZONAL
FLOW PROGGED FOR THE FORECAST AREA BY SUNDAY.  BY LATE SUNDAY INTO
MONDAY AN UPPER RIDGE BUILDS UP INTO THE FORECAST AREA FROM THE
SOUTH.  LOW LEVEL PRESSURE AND WINDS FIELDS SHOW A BIT OF COLD FRONT
AND UPSLOPE FOR MONDAY.  THE MOISTURE GRIDS SHOW VERY LITTLE
MOISTURE BY EARLY SUNDAY MORNING.  THIS CONTINUES INTO MONDAY...WITH
A BIT OF INCREASE BY MONDAY AFTERNOON.  THE MAIN THING IS THAT THE
LOW LEVELS ARE VERY DRY AND EVEN LIMITED POPS WILL BE HARD TO COME
BY.  NO POPS FOR SUNDAY.  WILL PUT ISOLATED IN FOR MONDAY
AFTERNOON.  TEMPERATURES ARE PROGGED TO CONTINUE VERY WARM...WITH A
BIT OF COOLER ON MONDAY.  IN THE EXTENDED PERIOD...MODELS INDICATE A
LARGE UPPER LEVEL RIDGE CENTERED JUST WEST OF THE FORECAST AREA FOR
TUESDAY THROUGH FRIDAY.  SOME LOW AND MIDDLE LEVEL MOISTURE IS
INDICATED OVER THE FORECAST SO WILL KEEP SLIGHT CHANCE GOING.
TUESDAY LOOKS COOLER THEN THE REST OF THE EXTENDED DAYS.   RJK

.DEN...NONE.

Severe Thunderstorm Warnings in Colorado, 2002Every severe thunderstorm warning in 2002

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.