Severe Thunderstorm Warning 46, NWS Denver/Boulder, CO

Issued

Aug 4, 2002, 7:11 PM MDT (01:11 UTC)

Expired

Aug 4, 2002, 8:05 PM MDT

In force

54 min

Issued by

NWS Denver/Boulder, CO

Area

Counties, with a storm outline in the text

County Logan County, CO

The Cheyenne radar (KCYS), 157 km from the middle of the area, began a volume at 01:10 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.

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.

953 
WUUS55 KBOU 050111
SVRDEN
COC075-050205-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
706 PM MDT SUN AUG 4 2002

THE NATIONAL WEATHER SERVICE IN DENVER HAS EXTENDED THE 

* SEVERE THUNDERSTORM WARNING FOR...
  LOGAN COUNTY IN NORTHEAST COLORADO
  THIS INCLUDES THE CITY OF STERLING

* UNTIL 805 PM MDT

* AT 704 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES SOUTHEAST OF ATWOOD...OR ABOUT 11 MILES
  SOUTH OF STERLING...MOVING NORTH AT 10 MPH.

* A SECOND SEVERE THUNDERSTORM WAS INDICATED ON DOPPLER RADAR 7      
  MILES NORTH OF CROOK...OR 22 MILES NORTHEAST OF STERLING.  

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
STERLING...ATWOOD...CROOK...FLEMING...ILIFF...LOGAN CORNERS...NORTH
STERLING RESERVOIR...PADRONI...PROCTOR...ST PETERSBURG AND TWIN
BUTTES.

HAIL UP TO AN INCH IN DIAMETER..VERY HEAVY RAINFALL UP TO AN INCH IN 
UNDER 20 MINUTES AND DAMAGING WINDS ARE POSSIBLE WITH THESE SEVERE 
THUNDERSTORMS.  

THE HEAVY RAINFALL 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.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER 
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM MAY ALSO PRODUCE A TORNADO WITH LITTLE OR NO WARNING. 

LAT...LON 4044 10331 4044 10311 4045 10269 4100 10265
          4099 10280 4101 10296 4079 10344
BAKER

NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 4, 3:01 PM MDT, 4 hours 10 minutes earlier.

NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER COLORADO
301 PM MDT SUN AUG 4 2002

TONIGHT:  CURRENT RADAR PICTURES ARE INDICATING SCATTERED SHOWERS
AND ISOLATED THUNDERSTORMS GOING OVER THE FOOTHILLS...PARK
COUNTY...AND THE PALMER RIDGE.  THIS AFTERNOON HAS A BIT MORE LOW
LEVEL MOISTURE IN PLACE THEN SATURDAY AFTERNOON AND THE ACARS
SOUNDINGS SHOW THE MID/UPPER LEVEL CAP A BIT WEAKER.  THE REAL
SOUNDINGS KEEP SHOWING PRECIPITABLE WATER VALUES OVER AN INCH.
SCATTERED TO ISOLATED POPS WILL SUFFICE THIS EVENING.

MONDAY THROUGH WEDNESDAY:  THE WATER VAPOR SATELLITE PICTURES ARE
SHOWING A BIT OF A MID/UPPER LEVEL DRY INTRUSION COMING OUR WAY.
HOWEVER THE MOISTURE SHOULD NOT BE PINCHED OFF COMPLETELY.  MODELS
SHOW THE UPPER RIDGE CENTER TO REMAIN EAST OF THE FORECAST OFFICE
THROUGH THE PERIOD.  SO WE SHOULD STAY IN THE FAVORABLE FETCH FOR
MID AND UPPER LEVEL MOISTURE.  IN THE LOW LEVELS...THE GRIDS KEEP
SOME FORM OF EASTERLY FLOW UP INTO THE FOOTHILLS THROUGH WEDNESDAY
ALONG WITH A DECENT THETA-E AXIS BELOW 600 MB...ESPECIALLY OVER THE
FOOTHILLS AND ADJACENT PLAINS.  CROSS SECTION LAPSE RATES SHOW A
PRETTY GOOD CAP CONTINUING BETWEEN 500-400 MB.  THE DIV-Q GRIDS SHOW
LITTLE SYNOPTIC SCALE FORCING ON MONDAY...BUT SOME WEAK ASCENT IN
PROGGED FOR TUESDAY AND WEDNESDAY.  PRECIPITATION GRIDS SHOW
MEASURABLE PRECIPITATION OVER THE WESTERN TWO-THIRDS OF THE FORECAST
AREA FROM ABOUT MID AFTERNOON THROUGH JUST AFTER MIDNIGHT ALL THREE
DAYS...MONDAY THROUGH WEDNESDAY.  SINCE IT ACTUALLY HAS STARTED TO
RAIN NOW WITH THE GREAT PONTOON UPON UP...PERSISTENCE SHOULD BE
THE BEST ROUTE TO GO WITH AS FAR AS POPS GO.  SCATTEREDS LOOK GOOD
FOR THE MOUNTAIN...FOOTHILLS...PALMER RIDGE...AND URBAN CORRIDOR
THROUGH THE PERIOD.  FOR TEMPERATURES...GRIDS SHOW MINOR FLUCTUATION
THROUGH THE PERIOD...BUT PERSISTENCE WILL BE GOOD... WHICH BY THE
WAY KEEPS THE READINGS NEAR NORMALS.  FOR THE EXTENDED PERIOD THE
UPPER RIDGE CENTER REMAINS EAST OF THE FORECAST AREA THROUGH ABOUT
FRIDAY.  AN UPPER TOUGH NORTH OF COLORADO PUSHES EAST LATE FRIDAY
INTO SATURDAY...WITH THE UPPER RIDGE PUSHING BACK TO OUR SOUTHWEST
BY SUNDAY. WILL START TO DRY OUT THE FORECAST FOR NEXT WEEKEND.  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.