Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 25, NWS Tucson, AZ

August 2, 2001Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 2, 2001, 10:00 PM MST for Pinal County, Arizona. It was in force for 30 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 2, 2001, 10:00 PM MST (05:00 UTC)
Expired: Aug 2, 2001, 10:30 PM MST
In force: 30 min
Issued by: NWS Tucson, AZ
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 59 km from the middle of the area, began a volume at 05:03 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, 5.0 hours before the alert went out and 91 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1041 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 2634 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KTWC 030502
SVRTUS

AZC021-030530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1000 PM MST THU AUG 2 2001

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL PINAL COUNTY IN ARIZONA
  THIS INCLUDES THE AREAS AROUND ELOY

* UNTIL 1030 PM MST

* AT 955 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM OVER ELOY..:.MOVING NORTHWEST AROUND 15 MPH.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING 
WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND HEAVY RAIN.

LAT...LON 3279 11171 3265 11145 3272 11135 3288 11159

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 2, 8:17 PM MST, 1 hour 43 minutes earlier.

Area forecast discussion, Aug 2, 8:17 PM MST, 1 hour 43 minutes before

SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
815 PM MST WED AUG 1 2001

.SYNOPSIS...A RIDGE OF HIGH PRESSURE WILL SLOWLY SHIFT WESTWARD
TOWARDS THE CENTRAL ROCKIES OVER THE WEEKEND...CONTINUING THE CHANCE
OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS INTO THE MIDDLE
OF NEXT WEEK.

.DISCUSSION...SENDING THIS OUT EARLY AS I EXPECT ACTIVITY TO PICK UP
IN THE NEXT HOUR IN TUCSON. HAS BEEN VERY ACTIVE EAST OF TUCSON WITH
MANY HEAVY RAINERS. SEVERAL THUNDERSTORMS SOUTH OF SAN SIMON EARLIER
THIS EVENING DROPPED BETWEEN THREE AND FIVE INCHES OF RAIN IN LESS
THAN TWO HOURS. MAIN THREAT OF STORMS TONIGHT WILL BE HEAVY RAIN
THAT MAY PRODUCE SOME FLASH FLOODING.

.TWC...NONE.

In the hours before

Local storm report, Aug 2, 9:49 PM MST, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
0949 PM MST THU AUG 2 2001

TIME (MST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0930 PM    RED ROCK                  AZ   WIND DAMAGE
08/02/01   PINAL                          TWO PALO VERDE TREES UPROOTED AND
                                          FENCE KNOCKED OVER AT PINAL AIR
                                          PARK

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 2, 5:55 PM MST	Flash Flood Warning	TWC	Cochise	65 min
Aug 3, 3:04 PM MST	Severe Thunderstorm Warning	TWC	Pima	71 min
Aug 3, 4:15 PM MST	Flash Flood Warning	TWC	Pima	15 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2001 Every 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.