Drought conditions persisted across eastern Utah.
Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GJT wrote it up.
Drought conditions persisted across eastern Utah.
The local office's own words before the first event, 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 the first event at Apr 30, 1:45 PM MST, 10 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 245 PM MDT MON APR 30 2007 .SHORT TERM (TONIGHT THROUGH WEDNESDAY)... WESTERLIES TO THE NORTH AND AN UPPER LOW OVER THE TEXAS PANHANDLE ARE RESULTING IN A WEAK DEFORMATION AREA OVER EASTERN UTAH AND WESTERN COLORADO THIS AFTERNOON. SURFACE HEATING AND CONVERGENCE OVER THE HIGH TERRAIN IS PRODUCING SOME THUNDERSTORMS ACROSS THE AREA. WEAK FLOW WILL YIELD SLOW MOVING AND SHORT LIVED STORMS WITH A DOWNWARD TREND THIS EVENING AS THE BOUNDARY LAYER COOLS AND THE ATMOSPHERE STABILIZES. A SHORTWAVE RIDGE WILL MOVE ACROSS THE FORECAST AREA TONIGHT AND TUESDAY MORNING WITH MAINLY CLEAR CONDITIONS. A CLOSED LOW CURRENTLY OFFSHORE SOUTHWEST OF LOS ANGELES WILL MOVE INLAND AND OVER THE LOWER COLORADO RIVER BY TUESDAY AFTERNOON AND THEN SWEEP ACROSS THE FOUR CORNERS AREA TUESDAY NIGHT AND EARLY WEDNESDAY. SOUTHERLY FLOW AHEAD OF THE SYSTEM WILL ADVECT ADDITIONAL MOISTURE OVER THE FORECAST AREA. DYNAMIC FORCING LOOKS SUFFICIENT ENOUGH FOR SCATTERED SHOWERS AND THUNDERSTORMS OVERNIGHT TUESDAY NIGHT AND CONTINUING INTO WEDNESDAY MORNING. AS THE UPPER LOW SHIFT EAST WEDNESDAY AFTERNOON THE CONVECTION WILL BECOME MORE TAILORED TO THE HIGH TERRAIN BUT STEERING WINDS WILL BE STRONG ENOUGH TO PUSH STORMS OFF THE MOUNTAINS AND OVER THE LOWER VALLEYS. POTENTIAL FOR SOME MODERATE TO LOCALLY HEAVY RAIN TUESDAY NIGHT AND EARLY WEDNESDAY...MAINLY OVER WESTERN COLORADO SOUTH OF INTERSTATE 70. WELL ABOVE NORMAL TEMPERATURES TO CONTINUE TUESDAY. SEVERAL DEGREES COOLER ON WEDNESDAY AS HEIGHTS FALL AHEAD OF A LONGWAVE TROUGH ALONG THE WEST COAST. LINDQUIST .LONG TERM (THURSDAY THROUGH MONDAY)... HAVE A GOOD DEGREE OF CONFIDENCE IN MEDIUM RANGE MODELS THAT ARE STILL IN RELATIVELY GOOD AGREEMENT THROUGH THE PERIOD. MODELS INDICATE NEGATIVE TILT TROF EXTENDING FROM GULF OF ALASKA LOW TO CENTRAL ROCKIES ON THURSDAY. THEN AN UPPER LOW LIKELY DEVELOPING OVER PACIFIC NORTHWEST ON FRIDAY...AS WOULD BE EXPECTED FROM NEGATIVE TILT DIFLUENT TROF. UPPER LOW MIGRATES TO OUR CWA BY SATURDAY AND SHOULD REMAIN OVER THE AREA THROUGH AT LEAST SUNDAY. GFS MAY BE A BIT TOO FAST AT FILLING UPPER LOW AND MOVING OUT THE TROUGH SUNDAY NIGHT...SINCE ALL MODELS INDICATE...ESPECIALLY EC...THAT THE HIGH AMPLITUDE UPPER RIDGE OVER EASTERN STATES IS NOT LIKELY TO BUDGE QUITE THAT SOON. THURSDAY-FRIDAY... PACIFIC TROUGH MOVING INTO THE WESTERN STATES LOOKS LIKE IT SHOULD PUSH COOL FRONT INTO OUR CWA...WITH SIGNIFICANT PREFRONTAL WINDS LIKELY ON THURSDAY. A LITTLE HIGH BASED CONVECTION POSSIBLE ON THURSDAY FOR SOME FIRE WX CONCERNS. THEN COOLER FRIDAY IN POST FRONTAL SITUATION...WITH MAX TEMPS BACK DOWN TO NEAR NORMAL. SATURDAY-SUNDAY... CLOSED UPPER LOW OVER OUR CWA SHOULD PRODUCE WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY...AS WELL AS NOTICEABLY COOLER TEMPERATURES. HAVE RAISED POPS A LITTLE AND LOWERED MAX TEMPS A LITTLE FROM PREVIOUS FORECAST...THOUGH EXPECT MUCH HIGHER POPS WILL BE NEEDED AS CONFIDENCE GROWS FOR THIS ANTICIPATED SCENARIO. LOWERED SNOW LEVELS TO BETWEEN 6000 AND 7500 FEET MSL SATURDAY NIGHT AND EARLY SUNDAY...AND SNOW ADVISORY MAY BE NEEDED FOR NORTHERN AND CENTRAL MOUNTAIN ZONES ABOVE 8000 FEET FOR SATURDAY NIGHT. MONDAY... WITH POSSIBILITY OF UPPER TROUGH PERSISTING OVER THE AREA...HAVE ALLOWED CHANCE CATEGORY POPS TO REMAIN OVER MOUNTAIN ZONES AND NORTHERN VALLEY ZONES...AND SLIGHT CHANCE POPS FOR SOUTHERN VALLEY ZONES. MAX TEMPS ON MONDAY SHOULD BE A TAD HIGHER THAN SUNDAY AS AIRMASS LIKELY TO SLOWLY MODIFY. HOWEVER...NORTHERLY GRADIENT WINDS WILL LIKELY MAKE IT FEEL QUITE CHILLY ON MONDAY. PRINGLE && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. TL/EH/JRP
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 545 AM MDT MON APR 30 2007 COZ001>014-017>023-UTZ022>025-027>029-011200- ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES- CENTRAL COLORADO RIVER BASIN- CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN- CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR- EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS- ELKHEAD AND PARK MOUNTAINS-FLAT TOPS- FOUR CORNERS/UPPER DOLORES RIVER- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS- GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN- NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER- ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH- SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU- UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY- UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS- 545 AM MDT MON APR 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED OVER THE HIGHER TERRAIN THIS AFTERNOON AND EVENING. THESE STORMS WILL PRODUCE SMALL HAIL AND WIND GUSTS TO 40 MPH WITH LITTLE RAINFALL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... THERE IS A CONTINUING CHANCE OF AFTERNOON/EVENING THUNDERSTORMS TUESDAY AND WEDNESDAY...MAINLY OVER HIGHER TERRAIN. THUNDERSTORM CHANCES WILL DIMINISH THURSDAY AND FRIDAY BEFORE RETURNING THIS WEEKEND.SOME STORMS WILL BE STRONG DURING THE PERIOD PRODUCING HAIL...GUSTY WINDS TO 40 MPH AND HEAVY RAIN OR SNOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. NL
The national radar mosaic for the moment the first event began.
7 drought. Local standard time, as filed.
Moderate drought conditions persisted across the area.
Moderate drought conditions persisted across the area.
Moderate to severe drought conditions persisted across the area.
Moderate drought conditions persisted across the area.
Moderate drought conditions persisted across the area.
Severe drought conditions prevailed across the area.
Moderate drought conditions persisted across the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2007Every state in 2007This day in weather historyWarnings in Utah, May 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 35184, 35185, 35186, 35187, 35188, 35190, 35191.