Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 35, NWS Tucson, AZ
NWS Tucson, AZ issued this severe thunderstorm warning at Aug 10, 2001, 5:43 PM MST for Graham County, Arizona. It was in force for 47 min. No storm report in the archive falls 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.
The facts
- Issued
- Aug 10, 2001, 5:43 PM MST (00:43 UTC)
- Expired
- Aug 10, 2001, 6:30 PM MST
- In force
- 47 min
- Issued by
- NWS Tucson, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Graham County, AZ
The radar
The Tucson radar (KEMX), 119 km from the middle of the area, began a volume at 00:45 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.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 0.7 hours before the alert went out and 115 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
- 1274 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1715 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 36 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.
016 WUUS55 KTWC 110042 SVRTUS AZC009-110130- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TUCSON AZ 543 PM MST FRI AUG 10 2001 THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN GRAHAM COUNTY IN ARIZONA THIS INCLUDES SAFFORD * UNTIL 630 PM MST * AT 540 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS 11 MILES SOUTH AND 10 MILES WEST OF SAFFORD. STORMS HAVE A HISTORY OF PRODUCING TORRENTIAL RAIN AND WIND GUSTS TO NEAR 80 MPH. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND HEAVY RAIN. LAT...LON 3287 11011 3254 11012 3256 10955 3293 10952
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 Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 10, 2:20 PM MST, 3 hours 23 minutes earlier.
Area forecast discussion, Aug 10, 2:20 PM MST, 3 hours 23 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TUCSON AZ 220 PM MST FRI AUG 10 2001 .SYNOPSIS...AMPLE MOISTURE AND AN UPPER LEVEL DISTURBANCE MOVING ACROSS NORTHERN ARIZONA WILL PROVIDE SCATTERED SHOWERS AND THUNDERSTORMS TO MUCH OF SOUTHEAST ARIZONA TONIGHT. LIGHT WINDS ALOFT IN COMBINATION WITH THE AMPLE MOISTURE WILL LEAD TO LOCALLY HEAVY RAINFALL. HIGH PRESSURE ALOFT WILL BECOME CENTERED NEAR THE FOUR CORNERS DURING THE WEEKEND. THIS FEATURE WILL BRING A NORTHEAST TO EAST UPPER LEVEL WIND FLOW TO SOUTHEAST ARIZONA. THIS FLOW WILL LEAD TO AN INCREASING CHANCE OF MAINLY AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS INTO EARLY NEXT WEEK. .DISCUSSION...SHOWERS AND THUNDERSTORMS CONTINUE TO DEVELOP AT THIS TIME ACROSS MAINLY THE CENTRAL CWA...EAST OF A DUDLEYVILLE...TO TUCSON...TO NOGALES LINE. SOUNDINGS FROM THIS MORNING INDICATE AN EXTREMELY MOIST BUT MARGINALLY UNSTABLE ATMOSPHERE WITH PRECIPITABLE WATER VALUES NEAR 2 INCHES. THE MAIN CONCERN THIS EVENING/TONIGHT IS FOR HEAVY RAIN AND FLASH FLOODING. A SHORT WAVE TROUGH OVER NRN AZ IS EXPECTED TO INCREASE ATMOSPHERIC LIFT TONIGHT. AM CONCERNED ABOUT DEVELOPMENT ON THE RIM AND MOUNTAINS EAST OF TUCSON. ORGANIZATION APPEARS LOOSE AT THIS TIME...HOWEVER EVENING SHIFT WILL NEED TO MONITOR FOR CONSOLIDATION AND ADDITIONAL DEVELOPMENT. WILL MENTION LOCALLY HEAVY RAINS IN ALL EXCEPT WRN ZONES WHERE ISOLATED THUNDERSTORMS SHOULD PREVAIL. APPEARS SATURDAY WILL BE A DOWN-DAY AS HIGH PRESSURE OVER NWRN AZ REPOSITIONS TOWARD THE FOUR CORNERS. GENERIC LOW-GRADE MONSOON POPS TO RULE. ELY FLOW PROGGED TO INCREASE SUN. THIS SCENARIO WILL PROVIDE AN INCREASED CHANCE OF SHOWERS AND THUNDERSTORMS INTO EARLY NEXT WEEK. NO CHANGES TO THE EXTENDED PERIOD. BF .TWC...NONE.
In the hours before
Special weather statement, Aug 10, 11:45 AM MST, 5 hours 58 minutes before
AZZ019-029>035-110700- SOUTHEAST ARIZONA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TUCSON AZ 1145 AM MST FRI AUG 10 2001 .SYNOPSIS...THERE HAS BEEN LITTLE CHANGE IN THE WEATHER PATTERN SINCE YESTERDAY. UPPER LEVEL HIGH PRESSURE REMAINS OVER NORTHWEST ARIZONA...WITH A WEAKENING TROUGH OF LOW PRESSURE OVER NEW MEXICO AND AN UPPER LEVEL DISTURBANCE PASSING ALONG THE ARIZONA-UTAH BORDER. EXTENSIVE CLOUD COVER WILL KEEP INSTABILITY LIMITED...BUT THE ATMOSPHERE WILL REMAIN VERY MOIST OVER THE REGION. .DISCUSSION...A MESOSCALE CONVECTIVE SYSTEM WHICH DEVELOPED OVER THE WESTERN MOGOLLON RIM LATE LAST NIGHT MOVED SOUTH ACROSS WESTERN PINAL AND CENTRAL PIMA COUNTIES THIS MORNING. THE CLOUD COVER FROM THIS COMPLEX SPREAD ACROSS ALL BUT THE FAR WESTERN AND EASTERN PORTIONS OF THE AREA...BUT WAS THINNING OUT JUST BEFORE NOON. SOUNDINGS FROM THIS MORNING INDICATE AN EXTREMELY MOIST BUT MARGINALLY UNSTABLE ATMOSPHERE WITH PRECIPITABLE WATERS NEAR 2 INCHES. THE LACK OF INSTABILITY WILL LIMIT THE STRENGTH OF STORM UPDRAFTS AND KEEP THE RISK OF SEVERE STORMS TO A MINIMUM. THE RISK IS SLIGHTLY HIGHER OVER GRAHAM AND COCHISE COUNTIES WHERE A TEMPERATURE CONTRAST HAS DEVELOPED BETWEEN THE CLOUDY SKIES NEAR TUCSON AND CLEAR SKIES FURTHER EAST. THE RISK FOR FLASH FLOODING...HOWEVER...IS CONSIDERABLY HIGHER THAN CLIMATOLOGY ALONG THE RIM AND EAST OF TUCSON. AN UPPER LEVEL DISTURBANCE CURRENTLY CROSSING NORTHERN ARIZONA IS EXPECTED TO INCREASE ATMOSPHERIC LIFT TONIGHT. THIS DISTURBANCE HAS ALREADY BEGUN TO IGNITE THUNDERSTORMS ON THE RIM AND MOUNTAINS EAST OF TUCSON...WITH THE HELP OF A LITTLE MORE SUNSHINE. ALTHOUGH THEY SHOULD REMAIN DISORGANIZED...ANY OF THESE STORMS COULD PRODUCE 2 INCHES OF RAIN PER HOUR. WE WILL CLOSELY MONITOR THE RIM THIS AFTERNOON FOR POSSIBLE ORGANIZATION. IF STORMS UP THERE CONSOLIDATE INTO A THUNDERSTORM COMPLEX AND START TO SHIFT SOUTH...A FLASH FLOOD WATCH MAY BECOME NECESSARY. OTHER STORMS SHOULD REDEVELOP LATE THIS AFTERNOON FROM TUCSON WEST. THEIR SLOW MOVEMENT WILL INCREASE THE THREAT OF FLASH FLOODING SLIGHTLY ABOVE CLIMATOLOGY...BUT THE MORE STABLE ATMOSPHERE WILL LIMIT THEIR STRENGTH AND KEEP ADDITIONAL HEAVY RAINS ISOLATED. STORM MOTION WILL BE GENERALLY SOUTHWEST AT 5 MPH. HOWEVER...SOME CELL MERGERS AND COLLISIONS COULD OCCUR WHICH WOULD MAKE SOME STORMS APPEAR STATIONARY. PYTLAK
Local storm report, Aug 10, 5:12 PM MST, 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
0512 PM MST FRI AUG 10 2001
TIME (MST) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0503 PM SAFFORD AZ 79 MPH TSTM GUST
08/10/01 GRAHAM SAFFORD AIRPORTThe office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 5:04 PM MST | Severe Thunderstorm Warning | TWC | Graham | 41 min |
| Aug 10, 5:22 PM MST | Flash Flood Warning | TWC | Graham | |
| Aug 10, 5:22 PM MST | Flash Flood Warning | TWC | Graham | 8 min |
| Aug 11, 4:23 PM MST | Severe Thunderstorm Warning | TWC | Pima | 52 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001
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.