Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 19, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 11, 2001, 3:44 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 31 min. 1 report 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
- Aug 11, 2001, 3:44 PM MST (22:44 UTC)
- Expired
- Aug 11, 2001, 4:15 PM MST
- In force
- 31 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Maricopa County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 16 km from the middle of the area, began a volume at 22:47 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 |
|---|---|---|---|
| Aug 11, 4:10 PM MST | Thunderstorm Wind 60 E | Mesa, AZ | Severe thunderstorm wind gusts damage trees, tree limbs torn off trees. |
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 nearest sounding before it
Phoenix, AZ (KPSR), launched 12:00Z, 10.7 hours before the alert went out and 30 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
- 558 J/kg
- Mixed-layer CIN
- -162 J/kg
- Mixed-layer LCL
- 1840 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
288 WUUS55 KPSR 112246 SVRPHX AZC013-021-112315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 344 PM MST SAT AUG 11 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA EXTREME NORTH CENTRAL PINAL COUNTY IN SOUTH CENTRAL ARIZONA THIS INCLUDES EAST MESA. * UNTIL 415 PM MST * AT 315 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM ABOUT 2 MILES NORTH OF APACHE JUNCTION...MOVING WEST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MESA AT 415 PM MST DAMAGING MICROBURST WINDS ARE LIKELY WITH THIS STORM. VERY HEAVY RAIN IS ALSO POSSIBLE. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM PASSES. INTENSE LIGHTNING IS OCCURRING WITH THIS STORM...MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS. IF TELEPHONE USE IS REQUIRED...USE A CELL PHONE. UNPLUG ANY UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE STORM ARRIVES. IF OUTDOORS...AVOID ISOLATED TALL OBJECTS SUCH AS TREES. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN PHOENIX. LAT...LON 3334 11153 3352 11150 3358 11182 3336 11185
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 Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 2:45 PM MST, 59 minutes earlier.
Area forecast discussion, Aug 11, 2:45 PM MST, 59 minutes before
AZZ020>028-CAZ030>033-120545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST SAT AUG 11 2001 .SYNOPSIS... A VERY MOIST AIRMASS WILL CONTINUE ACROSS SOUTH-CENTRAL ARIZONA THIS WEEKEND AND INTO EARLY NEXT WEEK...WITH LESSER AMOUNTS OF MOISTURE EXPECTED OVER FAR SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA. THIS MEANS THAT THERE WILL BE A CHANCE OF THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA...MAINLY DURING THE AFTERNOON AND EARLY NIGHTTIME HOURS. HIGH PRESSURE WILL BECOME ESTABLISHED NEAR THE FOUR CORNERS EARLY NEXT WEEK. THIS WILL GIVE A MORE EASTERLY FLOW ALOFT WHICH WILL SERVE TO PUSH DEEPER MOISTURE FURTHER WEST...FOR BETTER CHANCES OF STORMS ALONG AND WEST OF THE COLORADO RIVER AFTER SUNDAY. .DISCUSSION... MODELS REMAIN IN AGREEMENT. UPPER HIGH OVER SOUTHERN CA HAS BEEN MOVING NORTH TOWARD SOUTHERN NV TODAY AND WILL CONTINUE INTO 4 CORNERS REGION ON SUNDAY. UPPER FLOW TO SHIFT FROM NORTH TO NORTHEASTERLY TONIGHT AS UPPER HIGH MOVES INTO SOUTHERN NV. AIRMASS OVER SOUTH CENTRAL AZ REMAINS MOIST WITH MORNING PHX RAOB SHOWING A LITTLE UNDER 2 INCHES OF P WATER...ONLY SLIGHT LESS THAN FRI. THUS THERE WILL BE A CHANCE OF THUNDERSTORMS TONIGHT IN SOUTH CENTRAL AZ AS ACTIVITY NOW OVER AND IN VICINITY OF THE RIM REGION MAY MOVE DOWN INTO SOUTH CENTRAL AZ THIS EVENING AND TONIGHT AS THE FLOW BECOMES NORTHEASTERLY. IN ADDITION...THERE IS A VORTMAX IN VICINITY OF WHITE MOUNTAINS TONIGHT TO ENHANCE THUNDERSTORMS TOWARD SOUTH CENTRAL AZ. PLUS A WAVE IN NORTHERN MEXICO INTO SE AZ. WITH THE DEEP MOISTURE OVER SOUTHERN GILA COUNTY SOME STORMS MAY PRODUCE LOCALLY HEAVY RAINFALL. DRIER WESTERLY FLOW OVER SE CA TO KEEP THAT AREA MOSTLY CLEAR TONIGHT AND SUNDAY. FLOW TO BECOME MORE EAST TO SOUTHEASTERLY SUNDAY AS UPPER HIGH REACHES 4 CORNERS AREA. WITH MOIST AIRMASS OVER NM...THE EAST FLOW WILL KEEP SOUTH CENTRAL AZ MOIST ALONG WITH CHANCE OF THUNDERSTORMS. THIS MOIST EAST FLOW EXPECTED TO REACH SE CA BY LATE SUNDAY/MONDAY FOR PARTLY CLOUDY SKIES AND CHANCE OF THUNDERSTORMS BY MONDAY AND THEREAFTER. IN ADDITION AVN MOVES NORTHERN MEXICAN WAVE WESTWARD ALONG AZ SOUTHERN BORDER INTO THE NORTHERN GULF BY SUNDAY NIGHT / MONDAY. THIS ALONG WITH THE WESTWARD PUSH OF MOISTURE WILL BRING A CHANCE FOR THUNDERSTORMS INTO FAR SW AZ AND SE CA. EXTENDED MRF SHOWS LITTLE CHANGE AS MOIST FLOW TO REMAIN THROUGH EXTENDED PERIOD FOR PARTLY CLOUDY SKIES AND CHANCE OF THUNDERSTORMS OVER REGION. DKS
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.