Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 10, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 17, 2001, 4:01 PM MST for Maricopa County, Arizona. It was in force for 44 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 17, 2001, 4:01 PM MST (23:01 UTC)
- Expired
- Jul 17, 2001, 4:45 PM MST
- In force
- 44 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Maricopa County, AZ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 17, 4:15 PM MST | Thunderstorm Wind 60 E | Scottsdale, AZ | Large tree downed power pole snapped by thunderstorm winds. |
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, 11.0 hours before the alert went out and 49 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
- 26 J/kg
- Mixed-layer CIN
- -228 J/kg
- Mixed-layer LCL
- 2096 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KPSR 172303 SVRPHX AZC013-172345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 401 PM MST TUE JUL 17 2001 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA * UNTIL 445 PM MST * AT 4 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER NORTH TEMPE...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... PARADISE VALLEY AT 410 PM MST FOUNTAIN HILLS AT 440 PM MST SCOTTSDALE AT 410 PM MST INTENSE RAIN AND STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM PASSES. 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 3345 11210 3334 11193 3358 11162 3374 11181
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 Jul 17, 3:35 PM MST, 26 minutes earlier.
Area forecast discussion, Jul 17, 3:35 PM MST, 26 minutes before
AZZ020>028-CAZ030>033-180545- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 335 PM MST TUE JUL 17 2001 .SYNOPSIS... ARIZONA REMAINS BETWEEN LOW PRESSURE ALONG THE WEST COAST AND A HIGH PRESSURE SYSTEM OVER THE GREAT PLAINS. A LOW PRESSURE SYSTEM FROM NORTHWEST MEXICO MOVING NORTH MEANS SCATTERED SHOWERS AND THUNDERSTORMS IN SOUTH-CENTRAL ARIZONA TONIGHT...WITH SOME CLOUDS SPREADING OVER SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA. DRIER AIR FROM THE SOUTHWEST IS EXPECTED TO DECREASE THE CHANCE OF SHOWERS AND THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA BY FRIDAY AND SATURDAY. .DISCUSSION... AN INCREASE IN SHOWERS AND THUNDERSTORMS WAS TAKING PLACE IN SOUTH-CENTRAL ARIZONA EARLIER THAN EXPECTED THIS AFTERNOON. A HAZARDOUS WEATHER OUTLOOK WAS ISSUED EARLIER THIS AFTERNOON TO COVER THE POSSIBILITY OF STRONG THUNDERSTORMS LATE THIS AFTERNOON AND TONIGHT. A WEAK LOW PRESSURE SYSTEM IN NORTHWEST MEXICO MOVING NORTH IS RESPONSIBLE FOR THIS INCREASE IN SHOWERS AND THUNDERSTORMS. HAVE WORDED THE FORECAST WITH MAINLY EVENING SHOWERS AND THUNDERSTORMS IN SOUTH-CENTRAL ARIZONA...BUT THERE IS STILL A POSSIBILITY OF SHOWERS AND THUNDERSTORMS AT LEAST OVERNIGHT AND WEDNESDAY AS THE LOW PRESSURE SYSTEM CONTINUES APPROACHING FROM THE SOUTH. DRIER AIR FROM THE SOUTHWEST IS EXPECTED TO DECREASE THE CHANCE OF SHOWERS AND THUNDERSTORMS OVER SOUTH-CENTRAL ARIZONA BY FRIDAY AND SATURDAY. BEYOND THAT...THERE COULD BE AN INCREASE IN MOISTURE AGAIN. HOWEVER ...WITH SO MUCH UNCERTAINTY IN TIMING OF DRY AIR VERSES MORE HUMID AIR...HAVE CONTINUED SAME IDEA AS PREVIOUS FORECASTER FOR THE EXTENDED FORECAST...THAT IS A BROAD BRUSH OF MOSTLY CLEAR SKIES FOR SOUTHEAST CALIFORNIA AND SOUTHWEST ARIZONA...AND PARTLY CLOUDY SKIES FOR SOUTH-CENTRAL ARIZONA WITH A CHANCE OF AFTERNOON AND EARLY EVENING SHOWERS AND THUNDERSTORMS OVER THE HIGHER TERRAIN. ELLIS
In the hours before
Special weather statement, Jul 17, 1:37 PM MST, 2 hours 24 minutes before
AZZ022>024-027-028-180700-
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
137 PM MST TUE JUL 17 2001
...ISOLATED STRONG THUNDERSTORMS ARE POSSIBLE OVER SOUTH-CENTRAL
ARIZONA LATE THIS AFTERNOON THROUGH TONIGHT...
COUNTIES IN THE RISK AREA INCLUDE:
IN ARIZONA...MARICOPA...NORTHWEST PINAL...AND SOUTHERN GILA.
THE PRIMARY HAZARDOUS WEATHER RISKS INCLUDE:
LOW VISIBILITIES DUE TO BLOWING DUST...GUSTY WINDS UP< TO 50 MPH
...BRIEF HEAVY RAIN...AND DANGEROUS CLOUD TO GROUND LIGHTNING.
STORM SPOTTER ACTIVATION MAY BE NECESSARY LATE THIS AFTERNOON
THROUGH TONIGHT.
CRAIG ELLISNearby
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.