Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 60, NWS Flagstaff, AZ

August 10, 2001Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 10, 2001, 9:27 PM MST for Yavapai County, Arizona. It was in force for 33 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, 9:27 PM MST (04:27 UTC)
Expired: Aug 10, 2001, 10:00 PM MST
In force: 33 min
Issued by: NWS Flagstaff, AZ
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Yavapai County, AZ

The radar

The Phoenix radar (KIWA), 99 km from the middle of the area, began a volume at 04:17 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 4.5 hours before the alert went out and 131 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: 330 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1649 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 31 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.

309 
WUUS55 KFGZ 110427
SVRFLG
AZC025-110500-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
927 PM MST FRI AUG 10 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL YAVAPAI COUNTY IN ARIZONA
  THIS INCLUDES THE CITIES OF...BLACK CANYON CITY...BUMBLE BEE...ROCK
  SPRINGS

* UNTIL 1000 PM MST

* AT 927 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF BUMBLE BEE...MOVING
  SOUTHWEST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO...
  3 MILES NORTHWEST OF BLACK CANYON CITY AT 935 PM MST
  OVER ROCK SPRINGS AT 940 PM MST

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3412 11200 3423 11217 3406 11235 3391 11214

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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 10, 9:15 PM MST, 12 minutes earlier.

Area forecast discussion, Aug 10, 9:15 PM MST, 12 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
915 PM MST FRI AUG 10 2001

.SYNOPSIS...A MOIST NORTHERLY FLOW WILL CONTINUE TO PRODUCE SHOWERS
AND THUNDERSTORMS OVER NORTHERN ARIZONA TONIGHT. SCATTERED SHOWERS
AND THUNDERSTORMS WILL CONTINUE THROUGH THE WEEKEND AND INTO EARLY
NEXT WEEK...AS VERY MOIST AIR REMAINS OVER THE AREA.

.DISCUSSION...CONVECTION STILL GOING STRONG THIS EVENING...ALTHOUGH
AREAL COVERAGE HAS DECREASED. MOST CONVECTION FIRING ALONG AN OLD
OUTFLOW BOUNDARY/CONVERGENT LINE FROM THE GRAND CANYON TO SOUTH OF
PAYSON. HAD TO EXTEND THE FLASH FLOOD WATCH FOR THE EASTERN PORTIONS
OF YAVAPAI COUNTY DUE TO THE STRONG STORMS IN THE AREA...ALL OTHER
PORTIONS HAVE EXPIRED. EXPECT CONVECTION TO PRETTY MUCH END BY
MIDNIGHT...WITH A LOT OF DEBRIS CLOUD AND LIGHT SHOWERS FLOATING
AROUND AFTER THAT. SATURDAY AND SUNDAY LOOK LIKE MORE OF THE SAME.
FLASH FLOOD WATCHES WILL PROBABLY CROP UP AGAIN OVER THE
WEEKEND...BUT WILL LEAVE THIS TO THE MID-SHIFT. FIRST PERIOD CLEAN
UP ON THE WAY...NO OTHER UPDATES TONIGHT. PETERSON.

.FGZ...FLASH FLOOD WATCH UNTIL 10 PM MST FOR THE EASTERN THIRD OF
       YAVAPAI COUNTY.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:29 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	41 min
Aug 10, 8:18 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	32 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.