Severe Thunderstorm Warning 51, NWS Denver/Boulder, CO

Issued

Aug 5, 2002, 5:01 PM MDT (23:01 UTC)

Expired

Aug 5, 2002, 6:00 PM MDT

In force

59 min

Issued by

NWS Denver/Boulder, CO

Area

Counties, with a storm outline in the text

County Weld County, CO

The Denver radar (KFTG), 49 km from the middle of the area, began a volume at 23:02 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.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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.

619 
WUUS55 KBOU 052301
SVRDEN
COC123-060000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
500 PM MDT MON AUG 5 2002

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN WELD COUNTY IN NORTHEAST COLORADO
  THIS INCLUDES THE CITY OF SOUTHEASTERN GREELEY

* UNTIL 600 PM MDT

* AT 458 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES NORTHEAST OF KEENESBURG...OR ABOUT 23
  MILES SOUTHEAST OF GREELEY...MOVING NORTH AT 10 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO... 
EVANS...FORT LUPTON...GILCREST...HUDSON...KEENESBURG...KERSEY...LA 
SALLE...MILTON RESERVOIR...PLATTEVILLE...PROSPECT VALLEY...RIVERSIDE 
RESERVOIR AND ROGGEN.

VERY LARGE HAIL...TORRENTIAL RAINS AND DAMAGING WINDS ARE POSSIBLE 
WITH THUNDERSTORMS INTENSIFYING OVER SOUTHERN WELD COUNTY. IF YOU 
ARE IN THE PATH OF THESE STORM...PUT YOUR CAR IN A GARAGE AND MOVE 
TO A SUBSTANTIAL SHELTER.

HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY
MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO
RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 58 
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR 
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR 
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE 
INTO AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 4021 10493 4002 10494 4002 10419 4042 10422
          4044 10477
BAKER

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 5, 2:57 PM MDT, 2 hours 4 minutes earlier.

NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER COLORADO
257 PM MDT MON AUG 5 2002

TONIGHT:  SATELLITE AND RADAR PICTURES ARE INDICATING A PRONOUNCED
BOUNDARY FROM AROUND THE DENVER AREA EASTWARD ACROSS SOUTHERN
WASHINGTON COUNTY.  THE BOUNDARY WAS PUSHING SLOWLY NORTHWARD.
SCATTERED POPS WILL SUFFICE IN MOST AREAS THIS EVENING AND WILL
MENTION SOME HEAVY RAIN.  FOR THE SOUTHEASTERN FORECAST AREA
...ISOLATED POPS LOOK GOOD.

TUESDAY THROUGH THURSDAY:  MODELS KEEP PERSISTENCE GOING THROUGH
THURSDAY.  PLENTY OF MIDDLE AND UPPER UPPER MOISTURE TO CONTINUE
WITH THE UPPER RIDGE CENTER TO REMAIN EAST OF THE FORECAST AREA.
THE WATER VAPOR PICTURES ALSO SHOW A DECENT FETCH OF MOISTURE TO
COME FOR A COUPLE DAYS ANYWAY.  THE LOW LEVEL FLOW REMAINS WITH AN
EASTERLY COMPONENT OF SOME SORTS INTO THURSDAY AS WELL.  GRIDS SHOW
GOOD LOW LEVEL MOISTURE OVER THE WESTERN HALF OF THE FORECAST AREA
THROUGH THE PERIOD...HOWEVER THE EASTERN PLAINS ARE SOMEWHAT DRIER
FOR MOST OF THE TIME.  GRIDS SHOW SOME WEAK SYNOPTIC SCALE ASCENT
AROUND AND DECENT POTENTIAL INSTABILITY.  HOWEVER...THE THE STABLE
LAPSE RATES ALSO CONTINUE BETWEEN 500-400 MB.  WELL GO WITH
SCATTEREDS FOR MOST OF THE FORECAST AREA...LESS OVER THE EASTERN
ZONES.  TEMPERATURES SHOULD REMAIN PERSISTENT AS WELL.

IN THE EXTENDED PERIOD...FRIDAY THROUGH MONDAY:  ON FRIDAY...THE
MEDIUM RANGE MODELS CONTINUING SHOWING A FAIRLY DECENT UPPER TROUGH
PUSHING THROUGH THE FORECAST AREA WITH SOME LOW LEVEL UPSLOPE FLOW
EAST OF THE DIVIDE...THEN NORTHWESTERLY FLOW ALOFT ON SATURDAY.  THE
UPPER RIDGE CENTER SHIFTS BACK INTO THE SOUTHWESTERN UNITED STATES
BY SATURDAY AND THE MIDDLE AND UPPER LEVEL MOISTURE OVER THE
FORECAST AREA DISAPPEARS.  WILL KEEP THE DRY GOING SUNDAY AND
MONDAY.  COULD THE PONTOON BE OVER?     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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.