Alert archive / Colorado / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 12, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 24, 2000, 3:07 PM MDT for Logan County, Weld County, Colorado. It was in force for 23 min. 2 reports came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Apr 24, 2000, 3:07 PM MDT (21:07 UTC)
- Expired
- Apr 24, 2000, 3:30 PM MDT
- In force
- 23 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Logan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 98 km from the middle of the area, began a volume at 21:06 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 24, 3:08 PM MDT | Hail 0.75 | Buckingham, CO | |
| Apr 24, 3:12 PM MDT | Hail 0.75 | New Raymer, CO |
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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 24, 12:30 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.1 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.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- -167 J/kg
- Mixed-layer LCL
- 1578 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KBOU 242108 SVRDEN COC075-123-242130- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 307 PM MDT MON APR 24 2000 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME WEST CENTRAL LOGAN COUNTY IN NORTHEAST COLORADO EAST CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 330 PM MDT * AT 307 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 9 MILES SOUTHEAST OF KEOTA...OR ABOUT 25 MILES NORTHWEST OF FORT MORGAN...MOVING EAST AT 45 MPH. LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO... WILLARD...STONEHAM...PAWNEE PASS...NEW RAYMER AND KEOTA VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. LAT...LON 4073 10409 4052 10407 4052 10346 4076 10349
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 Apr 24, 2:42 PM MDT, 25 minutes earlier.
Area forecast discussion, Apr 24, 2:42 PM MDT, 25 minutes before
NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER COLORADO 230 PM MDT MON APRIL 24 2000 SHORT TERM DISCUSSION: STRONG UPPER LEVEL TROUGH WORKING ITS WAY ACROSS WESTERN PORTIONS OF CWA WHILE STRONG TO SEVERE CONVECTION ONGOING OVER FAR EASTERN CO. LINE OF CONVECTION ACROSS LINCOLN...AND THE FAR NERN CORNER WILL RAPIDLY MOVE OUT OF CWA LATER THIS AFTERNOON. SOME ADDITIONAL CONVECTION HAS ALSO DEVELOPED NEAR THE TROF AXIS ACROSS NRN WELD COUNTY. OVER THE URBAN COORIDOR...SFC MOISTURE HAS DECREASED RAPIDLY WITH DEWPOINTS DROPPING INTO THE 20S. ONLY EXPECT SOME SHOWERS...BUT GUSTY WINDS TO 50 MPH WITH TROF PASSAGE AND INCREASING W-NW FLOW SURFACING DOWN FOR A TIME. THINGS WILL REALLY QUITE DOWN THIS EVENING AS AMS DRIES AND STABILIZES FROM WEST TO EAST. LOWS TNT A LITTLE COOLER AS SKIES CLR WITH AMS A LITTLE COLDER. ENTREKIN LONG TERM DISCUSSION: DRY AND SUBSIDENT AIRMASS SHOULD BE IN PLACE ACROSS THE CWA ON TUESDAY AS UPPER RIDGING TAKES HOLD BEHIND TODAYS SHORT WAVE. WILL THEREFORE REMOVE ALL POPS AND GO WITH MOSTLY SUNNY. MODEL GRIDS AND FORECAST SOUNDINGS SUGGEST HIGHS OF 70 TO 75 ON THE PLAINS...AND SEE NO REASON TO ARGUE. UPPER LEVEL JET THEN BENDS NORTHWARD INTO WYOMING FOR WEDNESDAY NIGHT AND THURSDAY...SO A CONTINUATION OF DRY BUT EVEN WARMER WEATHER WILL PREVAIL AS MID LEVEL THERMAL RIDGE BUILDS INTO STATE. UPPER RIDGE CENTERS ITSELF OVER THE STATE FOR THURSDAY AND FRIDAY WITH TEMPS REACHING THE MID 80S ON THE PLAINS BY FRIDAY. THEN NEXT UPPER LOW MAY DRIFT INTO THE STATE LATE SATURDAY SO WILL INCLUDE A CHANCE OF SHOWERS AND THUNDERSTORMS AND SLIGHTLY COOLER TEMPS AT THAT TIME. BARJENBRUCH .DEN...NONE.
In the hours before
Special weather statement, Apr 24, 10:30 AM MDT, 4 hours 37 minutes before
COZ030-032>050-241900- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1030 AM MDT MON APR 24 2000 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: AN UPPER LEVEL LOW PRESSURE SYSTEM ACROSS NORTHWEST COLORADO AND WESTERN WYOMING WILL PUSH ACROSS EASTERN PORTIONS OF COLORADO THIS AFTERNOON. SCATTERED SHOWERS HAVE ALREADY BEEN OCCURRING AND ARE MOVING OVER HIGHER ELEVATIONS AND NORTHERN PORTIONS OF COLORADO. AN ASSOCIATED COLD FRONT IS ALSO MOVING ACROSS THE URBAN CORRIDOR AND WILL MOVE OVER THE NORTHEAST PLAINS THROUGH THE MID AFTERNOON HOURS. AHEAD OF THE FRONT...ADEQUATE LOW LEVEL MOISTURE COUPLED WITH AN UNSTABLE ATMOSPHERE WILL RESULT IN A FEW STORMS BECOMING SEVERE BY EARLY AFTERNOON OVER THE FAR EASTERN PLAINS OF COLORADO. THE BEST CHANCE FOR SEVERE WILL BE ALONG AND EAST OF A LINE FROM STERLING TO AKRON AND THEN EXTENDING INTO PHILLIPS AND SEDGWICK COUNTIES. HAIL WILL BE THE PRIMARY THREAT WITH THESE STORMS...WITH SOME ISOLATED REPORTS OF HAIL UP TO ONE INCH IN DIAMETER EXPECTED. FURTHER WEST ALONG THE URBAN CORRIDOR...LOW LEVEL MOISTURE WILL BECOME LOWER...SO BRIEF RAIN...GUSTY WINDS...AND SMALL WILL WILL BE THE PRIMARY THREAT. OUTLOOK FOR TUESDAY...A DRIER AND MORE STABLE ATMOSPHERE WILL MOVE OVER THE AREA...BUT STILL AN ISOLATED STORM IS STILL POSSIBLE.
Special weather statement, Apr 24, 10:35 AM MDT, 4 hours 32 minutes before
COZ030-032>050-241900- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1035 AM MDT MON APR 24 2000...CORRECTION TO MIDDLE PARAGRAPH... THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: AN UPPER LEVEL LOW PRESSURE SYSTEM ACROSS NORTHWEST COLORADO AND WESTERN WYOMING WILL PUSH ACROSS EASTERN PORTIONS OF COLORADO THIS AFTERNOON. SCATTERED SHOWERS HAVE ALREADY BEEN OCCURRING AND ARE MOVING OVER HIGHER ELEVATIONS AND NORTHERN PORTIONS OF COLORADO. AN ASSOCIATED COLD FRONT IS ALSO MOVING ACROSS THE URBAN CORRIDOR AND WILL MOVE OVER THE NORTHEAST PLAINS THROUGH THE MID AFTERNOON HOURS. AHEAD OF THE FRONT...ADEQUATE LOW LEVEL MOISTURE COUPLED WITH AN UNSTABLE ATMOSPHERE WILL RESULT IN A FEW STORMS BECOMING SEVERE BY EARLY AFTERNOON OVER THE FAR EASTERN PLAINS OF COLORADO. THE BEST CHANCE FOR SEVERE WILL BE ALONG AND EAST OF A LINE FROM STERLING TO AKRON AND THEN EXTENDING INTO PHILLIPS AND SEDGWICK COUNTIES. HAIL WILL BE THE PRIMARY THREAT WITH THESE STORMS...WITH SOME ISOLATED REPORTS OF HAIL UP TO ONE INCH IN DIAMETER EXPECTED. FURTHER WEST ALONG THE URBAN CORRIDOR...LOW LEVEL MOISTURE WILL BECOME LOWER...SO BRIEF RAIN...GUSTY WINDS...AND SMALL HAIL WILL BE THE PRIMARY THREAT. OUTLOOK FOR TUESDAY...A DRIER AND MORE STABLE ATMOSPHERE WILL MOVE OVER THE AREA...BUT STILL AN ISOLATED STORM IS STILL POSSIBLE.
Local storm report, Apr 24, 1:11 PM MDT, 1 hour 56 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
111 PM MDT MON APR 24 2000
...PRELIMINARY STORM REPORT FOR APRIL 24 2000...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1205 PM 5 NE WOODLIN SCHOOL CO 1.00 INCH HAIL
04/24/00 WASHINGTON
RAYLocal storm report, Apr 24, 2:55 PM MDT, 12 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
255 PM MDT MON APR 24 2000
...PRELIMINARY STORM REPORT FOR APRIL 24 2000...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1205 PM 5 NE WOODLIN SCHOOL CO 1.00 INCH HAIL
04/24/00 WASHINGTON
0250 PM 5 SE BOYERO CO 1.25 INCH HAIL
04/24/00 LINCOLN
COOPER
:The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 11:50 AM MDT | Severe Thunderstorm Warning | BOU | Washington | 40 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2000Every severe thunderstorm warning in 2000
Sources
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.