Alert archive / Colorado / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 130, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 7, 2003, 7:38 PM MDT for Phillips County, Sedgwick County, Colorado. It was in force for 52 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
- Jul 7, 2003, 7:38 PM MDT (01:38 UTC)
- Expired
- Jul 7, 2003, 8:30 PM MDT
- In force
- 52 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Counties, with a storm outline in the text
Counties Phillips County, CO, Sedgwick County, CO
The radar
The Goodland radar (KGLD), 164 km from the middle of the area, began a volume at 01:39 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 7, 5:00 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 1.6 hours before the alert went out and 130 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
- 797 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 2692 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KBOU 080138 SVRBOU COC095-115-080230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 736 PM MDT MON JUL 7 2003 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN PHILLIPS COUNTY IN NORTHEAST COLORADO THIS INCLUDES THE CITY OF HOLYOKE EASTERN SEDGWICK COUNTY IN NORTHEAST COLORADO THIS INCLUDES THE CITY OF JULESBURG * UNTIL 830 PM MDT * AT 736 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS OVER WESTERN SEDGWICK AND WESTERN PHILLIPS COUNTIES MOVING EAST AT 30 MPH. LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO... AMHERST...HOLYOKE...JULESBURG...PLEASANT VALLEY AND SIXTEEN-MILE CORNER. WIND GUSTS TO 70 MPH ALONG WITH HAIL TO ONE IN DIAMETER CAN BE EXPECTED WITH THE STORMS. 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 4099 10238 4045 10239 4046 10207 4100 10207 $$ RPK
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 Jul 7, 2:40 PM MDT, 4 hours 58 minutes earlier.
Area forecast discussion, Jul 7, 2:40 PM MDT, 4 hours 58 minutes before
NORTHEAST AND NORTH CENTRAL COLORADO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER CO 240 PM MDT MON JUL 7 2003 SHORT TERM DISCUSSION...TIMING OF SHORT WAVE ACROSS THE CWA STILL LOOKS TO BE FM 21Z-06Z. INTERACTIVE SOUNDINGS SHOW CAPES TO 3000 J/KG WITH VALUES OF 91/52 FOR T/TD. PLENTY OF MSTR WITH THETA-E RIDGE STRETCHING FM ROUGHLY BURLINGTON TO CHEYENNE. SOME CIN AS WELL BUT LIFT FM THE SHORT WAVE ALF OR COLLIDING OUTFLOW BOUNDARIES MAY BE ENUF TO OVERCOME THIS BARRIER. IN ADDITION...PRECIPITABLE WATER VALUES ARE ALSO PROGGED TO BE AROUND AN INCH AS MSTR INCREASE FM THE WEST ALF AND FM THE E AT THE LOWER LVLS. ENOUGH DIRECTIONAL SHEAR TO SUPPORT A FEW SVR STORMS LATE THIS AFTN AND EVENING. MESOETA DOES NOT MOVE 250 MB POTENTIAL VORTICITY LOBE (ASSOCIATED WITH THE SHORT WAVE) OUT OF ERN CO UNTIL 06Z SO THUNDERSTORMS NEAR THE ERN BORDER WILL LIKELY NOT DIMINISH UNTIL EARLY TUESDAY MORNING. ON TUESDAY...A DRIER WNWLY FLOW WILL BE OVER CO AS RIDGE OVER THE FOUR CORNERS AMPLIFIES. MSTR IN PROGGED TO DCRS AT ALL LEVELS SO THE POTENTIAL FOR THUNDERSTORMS WILL BE MUCH LOWER. WL MAINTAIN A SLGT CHC IN THE HIGHER TERRAIN AREAS. THERE MAY ALSO BE ENUF MSTR ALG THE ERN BORDER TO SPARK ISOLD THUNDERSTORMS LATE TUESDAY AFTN SO WL ADD SOME POPS IN THOSE AREAS. H7 TEMPERATURES AROUND 17C TUESDAY AFTN WILL ALLOW FOR TEMPERATURES IN THE M90S...SO WILL ADJUST THOSE GRIDS AS WELL. COOPER LONG TERM DISCUSSION...TROF AND CDFNT WILL MOVE THRU AREA ON NW FLOW TUE NIGHT...SO MORE TSTMS POSSIBLE...MAINLY NERN CORNER. THEN IT LOOKS LIKE A DAY OR TWO OF DRY SUBSIDENT FLOW. WILL REDUCE POPS ON THU...ONLY IN HIEST ELEVS. THEN PVS FCST LOOKS GOOD FOR FRI-MON. GENERALLY DRY NW FLOW FRIDAY...CHANCE OF TSTMS SAT WITH ANOTHER WEAK TROF...TRANSITIONING TO MOSTLY DRY SWLY FLOW EARLY NEXT WEEK. MAY GET SOME TRAPPED LOW LVL MSTR UNDER UPPER RIDGE THAT WILL BUBBLE UP FOR AFTN CNVTN...PROBABLY HOLDING OFF TIL NEXT WEEK. RTG .DEN...NONE.
Hazardous weather outlook, Jul 7, 11:15 AM MDT, 8 hours 23 minutes before
COZ030>051-081200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT MON JUL 07 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP BY 1 PM IN THE MOUNTAINS...FRONT FOOTHILLS AND HIGHER TERRAIN OF THE PALMER DIVIDE...THEN SPREAD EAST INTO THE REMAINDER OF NORTHEASTERN COLORADO THROUGH THE REST OF THE AFTERNOON AND EVENING. AN UPPER LEVEL DISTURBANCE OVER SOUTHWESTERN WYOMING WILL MOVE ACROSS NORTHERN COLORADO THIS AFTERNOON AND EVENING. THIS SYSTEM WHICH WILL ENHANCE THUNDERSTORM ACTIVITY ALONG WITH THE HIGHER MOISTURE LEVELS IN THE ATMOSPHERE. THE ATMOSPHERE WILL BECOME VERY UNSTABLE THIS AFTERNOON ALONG WITH ADEQUATE SHEAR OVER THE PLAINS LEADING TO A HIGHER THREAT OF SEVERE STORMS THAN IN PREVIOUS DAYS. THE MAIN THREAT WITH THE STORMS WILL BE LARGE HAIL...UP TO 2 INCHES IN DIAMETER...VERY HEAVY RAINFALL AND DAMAGING WINDS. THE STORMS WILL END FROM WEST TO EAST BY LATE THIS EVENING WITH CLEARING SKIES EXPECTED AFTER MIDNIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED THUNDERSTORMS ARE POSSIBLE OVER THE MOUNTAINS TUESDAY AFTERNOON AND THE FAR NORTHEAST PLAINS TUESDAY NIGHT WITH A SLIGHT RISK OF SEVERE THUNDERSTORMS EAST OF STERLING TUESDAY EVENING. THE THEME FOR MOST OF THE WEEK WILL BE MOSTLY DRY AND HOT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED AFTER 2 PM. COOPER/GLANCY
In the hours before
Local storm report, Jul 7, 5:08 PM MDT, 2 hours 30 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
508 PM MDT MON JUL 07 2003
...PRELIMINARY STORM REPORT FOR JULY 07 2003...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0425 PM 6 N MASONVILLE CO 0.75 INCH HAIL
07/07/03 LARIMER
JKLocal storm report, Jul 7, 5:40 PM MDT, 1 hour 58 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
540 PM MDT MON JUL 07 2003
...PRELIMINARY STORM REPORT FOR JULY 07 2003...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0425 PM 6 N MASONVILLE CO 0.75 INCH HAIL
07/07/03 LARIMER
0532 PM EVANS CO 0.75 INCH HAIL
07/07/03 WELD
JKLocal storm report, Jul 7, 5:45 PM MDT, 1 hour 53 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
545 PM MDT MON JUL 07 2003
...PRELIMINARY STORM REPORT FOR JULY 07 2003...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0425 PM 6 N MASONVILLE CO 0.75 INCH HAIL
07/07/03 LARIMER
0532 PM EVANS CO 0.75 INCH HAIL
07/07/03 WELD
0540 PM GREELEY CO 0.75 INCH HAIL
07/07/03 WELD
JKLocal storm report, Jul 7, 6:27 PM MDT, 1 hour 11 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
627 PM MDT MON JUL 07 2003
...PRELIMINARY STORM REPORT FOR JULY 07 2003...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0425 PM 6 N MASONVILLE CO 0.75 INCH HAIL
07/07/03 LARIMER
0532 PM EVANS CO 0.75 INCH HAIL
07/07/03 WELD
0540 PM GREELEY CO 0.75 INCH HAIL
07/07/03 WELD
0615 PM 6 W FORT MORGAN CO 2.00 INCH HAIL
07/07/03 MORGAN
JKLocal storm report, Jul 7, 6:54 PM MDT, 44 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
654 PM MDT MON JUL 07 2003
...PRELIMINARY STORM REPORT FOR JULY 07 2003...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0425 PM 6 N MASONVILLE CO 0.75 INCH HAIL
07/07/03 LARIMER
0532 PM EVANS CO 0.75 INCH HAIL
07/07/03 WELD
0540 PM GREELEY CO 0.75 INCH HAIL
07/07/03 WELD
0615 PM 6 W FORT MORGAN CO 2.00 INCH HAIL
07/07/03 MORGAN
0627 PM 2 S MERINO CO 65 MPH TSTM WIND GUST
07/07/03 LOGAN MEASURED BY SPOTTER
0640 PM STERLING CO 60 MPH TSTM WIND GUST
07/07/03 LOGAN ESTIMATED BY SPOTTER
10 INCH DIAMETER TREE SNAPPED
JKLocal storm report, Jul 7, 7:37 PM MDT, 1 minute before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO3
737 PM MDT MON JUL 07 2003
...PRELIMINARY STORM REPORT FOR JULY 07 2003...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0425 PM 6 N MASONVILLE CO 0.75 INCH HAIL
07/07/03 LARIMER
0532 PM EVANS CO 0.75 INCH HAIL
07/07/03 WELD
0540 PM GREELEY CO 0.75 INCH HAIL
07/07/03 WELD
0615 PM 6 W FORT MORGAN CO 2.00 INCH HAIL
07/07/03 MORGAN
0627 PM 2 S MERINO CO 65 MPH TSTM WIND GUST
07/07/03 LOGAN MEASURED BY SPOTTER
0640 PM STERLING CO 60 MPH TSTM WIND GUST
07/07/03 LOGAN ESTIMATED BY SPOTTER
10 INCH DIAMETER TREE SNAPPED
0710 PM WAGES CO 70 MPH TSTM WIND GUST
07/07/03 PHILLIPS ESTIMATED BY SPOTTER
0734 PM 4 E HAXTUN CO 73 MPH TSTM WIND GUST
07/07/03 PHILLIPS MEASURED BY SPOTTER
JKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 6:12 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 63 min |
| Jul 7, 6:41 PM MDT | Tornado Warning | BOU | Logan | 49 min |
| Jul 7, 7:04 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 41 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2003Every severe thunderstorm warning in 2003
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.