Alert archive / Colorado / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 24, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Sep 10, 2003, 4:36 AM MDT for Mesa County, Colorado. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 10, 2003, 4:36 AM MDT (10:36 UTC)
- Expired
- Sep 10, 2003, 5:15 AM MDT
- In force
- 39 min
- Issued by
- NWS Grand Junction, CO
- Area
- Counties, with a storm outline in the text
County Mesa County, CO
The nearest sounding before it
Grand Junction, CO (KGJT), launched 00:00Z, 10.6 hours before the alert went out and 13 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1203 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 10, 3:30 AM MDT, 1 hour 6 minutes earlier.
Area forecast discussion, Sep 10, 3:30 AM MDT, 1 hour 6 minutes before
WESTERN COLORADO & EASTERN UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 330 AM MDT WED SEP 10 2003 SHORT TERM (TODAY THROUGH TONIGHT)... ACTIVE WEATHER AGAIN ON THE UPSWING. WILL BE SHIFTING EMPHASIS OF THIS SHIFT INTO SEVERE WEATHER MODE ASAP SO WILL ATTEMPT TO BE BRIEF. DEEP WINTER-LIKE STORM SYSTEM MOVING EASTWARD ACROSS THE GREAT BASING OVERNIGHT. STRONG JET ALIGNED ALONG SOUTHERN CO WITH IMPULSE BACK IN CENTRAL UTAH BEGINNING TO DRIVE COLD FRONT INTO NORTHWEST CO AND EAST-CENTRAL UTAH. STRONG THUNDERSTORMS DEVELOPING ALONG THIS FRONT INDICATIVE OF GOOD LOW LEVEL CONVERGENCE/UPPER LEVEL DIVERGENCE COUPLET. STORMS MOVING RAPIDLY EASTWARD SO NOT AS CONCERNED ABOUT FLOODING AS POSSIBLE SEVERE WEATHER AT THIS POINT. DYNAMICS AND WIND FLOW NOT AS FAVORABLE SOUTH...SO WILL END FLASH FLOOD WATCH AND SNOW ADVISORIES IN THAT REGION. AS THE FRONT PUSHES EAST EXPECT NUMEROUS SHOWERS AND THUNDERSTORMS ACROSS MUCH OF THE REGION. THICKNESSES...DYNAMICS AND EXPERIENCE IN SAN JUAN MOUNTAINS YESTERDAY POINTS TO SIGNIFICANT SNOW ACCUMULATIONS FOR THE CENTRAL MOUNTAINS FROM LATE THIS MORNING INTO THE EVENING HOURS. GIVEN FIRST SNOW EVENT WILL GO AHEAD WITH SNOW ADVISORY FROM MID-MORNING THROUGH EARLY EVENING FOR THE FLAT TOPS...GORE...ELKHEAD AND PARK MOUNTAINS AS WELL AS THE REMAINING CENTRAL MOUNTAINS FOR ELEVATIONS ABOVE 9500 FEET. LATER SHIFTS WILL NEED TO EVALUATE ANY ADDITIONS. TEMPERATURES MUCH COOLER BEHIND THE FRONT. TROF AXIS SLIDES EAST OF THE DIVIDE THIS EVENING WITH NORTHWEST FLOW SETTLING IN. THIS SHOULD KEEP SNOW GOING FOR A LITTLE WHILE IN THE NORTHERN MOUNTAINS. ELSEWHERE...SHOWERS WILL BECOME MORE SCATTERED AS DYNAMICS WANE AND COLD CORE MOVES OVERHEAD. NL THURSDAY AND THURSDAY NIGHT...TROF MOVES SLOWLY EAST TO HIGH PLAINS BY LATE THURSDAY. COOL NORTHWEST UNSTABLE FLOW WILL ALLOW SLIGHT CHANCE SHOWERS OVER LOWER ELEVATIONS WITH CHANCE SHOWERS OVER HIGHER TERRAIN. DRIER AIR MOVES INTO THE REGION BY THURSDAY NIGHT WITH ONLY SLIGHT CHANCE POPS EXPECTED ACROSS THE NORTH. WITH SLIGHTLY WARMER AIR ON THURSDAY...EXPECT SNOW LEVELS AROUND 8500 FEET. FRIDAY AND SATURDAY...EXPECT FRIDAY TO BE AN IN BETWEEN DAY AS NEXT SYSTEM APPROACHES FROM THE WEST. CLOUDS WILL INCREASE FROM THE NORTH ON FRIDAY WITH SLIGHT CHANCE OF SHOWERS ACROSS NORTHERN SECTIONS. MODELS CONTINUE TO INCREASE STRENGTH OF THE SYSTEM WITH EACH SUCCESSIVE RUN. WITH GOOD DYNAMICS AND MOISTURE EXPECT SYSTEM TO BRING CHANCE OF SHOWERS MOUNTAINS AND NORTH ON SATURDAY. SYSTEM APPEARS TO BE QUITE COLD AND EXPECT SNOW TO BE A CONCERN OVER MOUNTAIN LOCATIONS. MPM SUNDAY THROUGH TUESDAY... TROF SLOWLY MOVES OUT OF THE AREA ON SUNDAY BRINGING DRIER AND SLIGHTLY WARMER CONDITIONS. MAIN STORM TRACK FOR PACIFIC DISTURBANCES WILL REMAIN NORTH OF THE CWA MONDAY IN MODERATE WNW FLOW ALOFT. ON TUESDAY IT APPEARS THE WINDS ALOFT BECOME MORE NORTHWESTERLY ACCORDING TO THE MRF. THIS BRINGS A SHORTWAVE TROUGH AND COLD FRONT INTO THE NORTHERN HALF OF THE CWA ON TUESDAY. HAVE INCREASED POPS A NOTCH IN THE NRN HALF OF THE CWA...DROPPED TEMPS A BIT AND INCREASED RH AND SFC WINDS FOR TUE. WEDNESDAY...COLD FRONT PASSES THROUGH ERN UT AND WRN CO AFFECTING NORTHERN HALF OF AREA MOST. FLOW ALOFT BECOMES NW AND DRIES FROM NW TO SE THROUGH THE DAY. TEMPS COOLS WITH THICKNESS DECREASES. CJC .GJT...WINTER WEATHER ADVISORY FROM 900 AM TO 900 PM FOR CENTRAL AND NORTHERN COLORADO MOUNTAINS.
Hazardous weather outlook, Sep 9, 4:53 PM MDT, 11 hours 43 minutes before
COZ001>014-017>023-UTZ022>025-027>029-101200- HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE GRAND JUNCTION CO 453 PM MDT TUE SEP 9 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN COLORADO AND FOR EASTERN UTAH .DAY ONE...TODAY AND TONIGHT... ...FLASH FLOOD WATCH IN EFFECT THROUGH 9:00 AM MDT WEDNESDAY FOR SOUTHEAST UTAH...AND WESTERN COLORADO... ...WINTER WEATHER EXPECTED ACROSS THE HIGH ELEVATIONS... THUNDERSTORMS PRODUCING HEAVY RAIN...SOME RECURRING OVER THE SAME LOCATION...WILL AFFECT EASTERN UTAH AND WESTERN COLORADO THROUGH TONIGHT. THE HEAVIEST RAINFALL IS EXPECTED TO OCCUR ACROSS SOUTHEAST UTAH AND SOUTHWEST COLORADO. THUNDERSTORMS WILL ALSO PRODUCE DANGEROUS CLOUD TO GROUND LIGHTNING...GUSTY WINDS...AND POSSIBLY SMALL HAIL. IN ADDITION...COOLER AIR FILTERING INTO THE AREA WILL RESULT IN SNOW ACCUMULATIONS OVER THE MOUNTAINS PEAKS AND HIGH ELEVATION PASSES. A STRONG FALL-LIKE STORM SYSTEM WILL MOVE ACROSS THE GREAT BASIN TONIGHT WITH MUCH OF ITS ENERGY FOCUSING ON EASTERN UTAH AND WESTERN COLORADO. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY... SNOWFALL IS EXPECTED TO CONTINUE IN THE HIGH MOUNTAIN AREAS WEDNESDAY WITH SOME LOWERING OF SNOW LEVELS ACROSS THE NORTH. SNOW WILL BE ACCOMPANIED BY THUNDER AT TIMES WHICH WILL LIKELY ENHANCE ACCUMULATIONS. THE LOWER ELEVATIONS WILL CONTINUE TO SEE THUNDERSTORM ACTIVITY WITH LOCALLY HEAVY RAIN...SMALL HAIL AND WIND GUSTS TO 30 MPH. A MOIST AND UNSTABLE AIRMASS WILL REMAIN IN PLACE ACROSS THE REGION AS THE STORM CENTER MOVES OVERHEAD ON WEDNESDAY. DRIER CONDITIONS ARE EXPECTED IN THE WAKE OF THE STORM ON THURSDAY AND FRIDAY...THOUGH ISOLATED THUNDERSTORMS ARE EXPECTED SATURDAY... SUNDAY AND MONDAY...THOUGH MAINLY OVER HIGHER TERRAIN. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS WILL NOT BE NEEDED TODAY OR TONIGHT. HOWEVER... SPOTTERS ARE ENCOURAGED TO PHONE IN REPORTS OF STRONG WINDS...HAIL AND HEAVY RAIN AS SOON AS POSSIBLE. NL/TAL
In the hours before
Local storm report, Sep 9, 11:04 PM MDT, 5 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1104 PM MDT TUE SEP 09 2003
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1130 AM 23 S CORTEZ CO FLASH FLOOD
09/09/03 MONTEZUMA WATER AND DEBRIS FLOWS
OVER HIGHWAY 491. 2 CARS
STUCK.
1215 PM 9 N DURANGO CO FLASH FLOOD
09/09/03 LA PLATA COUNTY ROAD 250 CLOSED DUE
TO MUD AND DEBRIS FLOWS.
1215 PM 7 N BAYFIELD CO FLASH FLOOD
09/09/03 LA PLATA COUNTY ROAD 501 CLOSED DUE
TO MUD AND DEBRIS FLOWS.
0220 PM 17 S BLUFF UT FLASH FLOOD
09/09/03 SAN JUAN HIGHWAY 191 CLOSED BETWEEN
MILE MARKER 3 AND 4 DUE TO
DEBRIS FLOWS.
0600 PM 10 N DURANGO CO FLASH FLOOD
09/09/03 LA PLATA FLASH FLOODING - 9 FOOT
DEEP WATER AND DEBRIS OVER
COUNTY ROAD 250.
0600 PM 27 N DURANGO CO 0.00 IN HEAVY SNOW
09/09/03 SAN JUAN 4 INCHES OF SNOW AT
DURANGO MOUNTAIN SKI RESORT
0800 PM 10 SE DURANGO CO 0.00 IN HEAVY RAIN
09/09/03 LA PLATA 3.58 INCHES OF RAIN - 12
HOUR TOTAL
0730 PM 16 NE BLUFF UT FLASH FLOOD
09/09/03 SAN JUAN FLASH FLOODING WASHED AWAY
VEHICLE ON COUNTY ROAD NEAR
HATCH.
0730 PM 15 SE BLUFF UT FLASH FLOOD
09/09/03 SAN JUAN FLASH FLOODING AT WHITE
MESA VILLAGE.
0800 PM CORTEZ CO FLASH FLOOD
09/09/03 MONTEZUMA 1 FOOT DEEP WATER FLOWING
DOWN CITY STREETS.
0805 PM 8 W CORTEZ CO AVALANCHE
09/09/03 MONTEZUMA FLASH FLOODING IN MCELMO
CANYON. SEVERAL ROADS
WASHED OUT.
0830 PM SILVERTON CO 0.00 IN HEAVY SNOW
09/09/03 SAN JUAN 4 INCHES OF SNOW. 10
INCHES AT MOLAS PASS.
0645 PM 2 SE PLACERVILLE CO AVALANCHE
09/09/03 SAN MIGUEL MUD FLOW 10 INCHES DEEP
AND 30 FEET LONG ACROSS
HIGHWAY 145 AT MILE MARKER
82.
1103 PM DURANGO CO FLASH FLOOD
09/09/03 LA PLATA
DJNLocal storm report, Sep 9, 11:04 PM MDT, 5 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1104 PM MDT TUE SEP 09 2003
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1130 AM 23 S CORTEZ CO FLASH FLOOD
09/09/03 MONTEZUMA WATER AND DEBRIS FLOWS
OVER HIGHWAY 491. 2 CARS
STUCK.
1215 PM 9 N DURANGO CO FLASH FLOOD
09/09/03 LA PLATA COUNTY ROAD 250 CLOSED DUE
TO MUD AND DEBRIS FLOWS.
1215 PM 7 N BAYFIELD CO FLASH FLOOD
09/09/03 LA PLATA COUNTY ROAD 501 CLOSED DUE
TO MUD AND DEBRIS FLOWS.
0220 PM 17 S BLUFF UT FLASH FLOOD
09/09/03 SAN JUAN HIGHWAY 191 CLOSED BETWEEN
MILE MARKER 3 AND 4 DUE TO
DEBRIS FLOWS.
0600 PM 10 N DURANGO CO FLASH FLOOD
09/09/03 LA PLATA FLASH FLOODING - 9 FOOT
DEEP WATER AND DEBRIS OVER
COUNTY ROAD 250.
0600 PM 27 N DURANGO CO SNOW
09/09/03 SAN JUAN 4 INCHES OF SNOW AT
DURANGO MOUNTAIN SKI RESORT
0800 PM 10 SE DURANGO CO 3.58 INCHES OF RAIN -
09/09/03 LA PLATA 12 HOUR TOTAL
0730 PM 16 NE BLUFF UT FLASH FLOOD
09/09/03 SAN JUAN FLASH FLOODING WASHED AWAY
VEHICLE ON COUNTY ROAD
NEAR HATCH.
0730 PM 15 SE BLUFF UT FLASH FLOOD
09/09/03 SAN JUAN FLASH FLOODING AT WHITE
MESA VILLAGE.
0800 PM CORTEZ CO FLASH FLOOD
09/09/03 MONTEZUMA 1 FOOT DEEP WATER FLOWING
DOWN CITY STREETS.
0805 PM 8 W CORTEZ CO FLASH FLOOD
09/09/03 MONTEZUMA FLASH FLOODING IN
MCELMO CANYON. SEVERAL
ROADS WASHED OUT.
0830 PM SILVERTON CO SNOW
09/09/03 SAN JUAN 4 INCHES OF SNOW.
10 INCHES AT MOLAS PASS.
0645 PM 2 SE PLACERVILLE CO FLASH FLOOD
09/09/03 SAN MIGUEL MUD FLOW 10 INCHES DEEP
AND 30 FEET LONG ACROSS
HIGHWAY 145 AT MILE MARKER
82.
0200 PM 9 W DURANGO CO FLASH FLOOD.
09/09/03 LA PLATA STREET FLOODING
0900 PM CORTEZ CO FLASH FLOOD.
09/09/03 MONTEZUMA MUNICPAL AIRPORT ROAD
WASHED OUT.
DJNThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 6:23 PM MDT | Flash Flood Warning | GJT | Dolores, Ouray, San Miguel | 6 hr |
| Sep 9, 6:25 PM MDT | Flash Flood Warning | GJT | Montezuma | 6 hr |
| Sep 9, 8:24 PM MDT | Flash Flood Warning | GJT | La Plata | 4 hr |
| Sep 10, 7:44 AM MDT | Flash Flood Warning | GJT | Garfield | 3 hr |
| Sep 10, 1:45 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 45 min |
| Sep 10, 2:28 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 47 min |
| Sep 10, 2:41 PM MDT | Flash Flood Warning | GJT | Mesa | 2 hr |
| Sep 9, 6:40 PM MDT | Flash Flood Warning | GJT | San Juan | 6 hr |
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.