Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 61, NWS Flagstaff, AZ

August 12, 2001Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 12, 2001, 6:03 PM MST for Yavapai County, Arizona. It was in force for 27 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 12, 2001, 6:03 PM MST (01:03 UTC)
Expired
Aug 12, 2001, 6:30 PM MST
In force
27 min
Issued by
NWS Flagstaff, AZ
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 63 km from the middle of the area, began a volume at 01:04 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, 1.1 hours before the alert went out and 81 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 00:00Z on 2001-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 339 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 00:00Z on 2001-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
339 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1354 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
-47 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.

033 
WUUS55 KFGZ 130103
SVRFLG
AZC025-130130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
603 PM MST SUN AUG 12 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL YAVAPAI COUNTY IN ARIZONA
  THIS INCLUDES THE CITY OF CAMP VERDE

* UNTIL 630 PM MST

* AT 603 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM 6 MILES SOUTH OF CAMP VERDE ALONG INTERSTATE   
  17.  THE STORM WAS   NEARLY STATIONARY.


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

LAT...LON 3454 11198 3438 11186 3445 11171 3462 11187

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 12, 2:30 PM MST, 3 hours 33 minutes earlier.

Area forecast discussion, Aug 12, 2:30 PM MST, 3 hours 33 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST SUN AUG 12 2001

.SYNOPSIS...A MOIST AND UNSTABLE AIR MASS OVER NORTHERN ARIZONA WILL
REMAIN THROUGH MONDAY. ON MONDAY...AN UPPER LEVEL WEATHER SYSTEM IN
CONJUNCTION WITH DAYTIME HEATING WILL AID IN WIDESPREAD
THUNDERSTORMS DEVELOPMENT...ROUGHLY EAST OF A PAGE TO FLAGSTAFF
LINE. DRIER AIR WILL BE PULLED ACROSS NORTHERN ARIZONA ON WESTERLY
FLOW...STARTING MONDAY NIGHT INTO TUESDAY. THE DRIER AIR ALOFT WILL
REDUCE THE HEAVY RAIN POTENTIAL. LOW LEVEL MOISTURE...HOWEVER WILL LINGER
ACROSS THE AREA THROUGH MID WEEK FOR A CHANCE OF AFTERNOON SHOWERS
AND THUNDERSTORMS EACH DAY.

.DISCUSSION...GOES SOUNDER INDICATES INCREASES IN TOTAL PRECIP WATER
MOVING INTO SOUTHERN YAVAPAI AND NORTHERN GILA COUNTIES THIS
AFTERNOON. SHOWERS AND THUNDERSTORMS DEVELOPING ALONG STRONG THETA-E
GRADIENT. MODELS FORECAST THIS BOUNDARY TO SLOWLY SHIFT NORTH THIS
EVENING...AND THEN UP INTO SOUTHERN UTAH BY MORNING. SOME WHAT OF A
WEAK CAP OVER THE EASTERN MOGOLLON RIM AND WHITE MOUNTAINS THIS
AFTERNOON...THAT WE WILL NOT EXTEND FFA INTO THE AREA THIS EVENING.
WEAK DIVERGENCE OVER THE SAME AREA TONIGHT IN CONJUNCTION WITH
INERTIAL INSTABILITY AT THE 300-200MB LEVEL. MESO-ETA FORECASTS THE
MOISTURE TO LIFT NORTHWARD OVERNIGHT. A DEFORMATION AXIS SETS UP
FROM THE NORTHEAST PLATEAUS DOWN TOWARD THE PRESCOTT AREA ON MONDAY
AS A RESULT OF THE EASTERLY CIRCULATION NOW OVER NORTHERN
MEXICO/TEXAS AREA AND A THROUGH PUSHING ACROSS CALIFORNIA. THE
DEFORMATION AXIS AND THE DEEP MOISTURE WILL INTERACT FOR WIDE SPREAD
THUNDERSTORMS AGAIN ON MONDAY. THE TROUGH IN CALIFORNIA MOVES ACROSS
THE AREA MONDAY NIGHT...PUSHING DRIER MID TO UPPER LEVEL AIR INTO
THE FORECAST AREA...REDUCING THE THREAT OF HEAVY RAIN. LOW-LEVEL
MOISTURE WILL REMAIN IN PLACE TUESDAY AND TO A LESSER EXTENT ON
WEDNESDAY...LOW LEVEL MOISTURE WILL BE SUFFICIENT FOR ISOLATED TO
SCATTERED AFTERNOON THUNDERSTORMS.

EXTENDED...MOISTURE REMAINS LIMITED AT LEAST BY MODEL FORECASTS
THROUGH FRIDAY. HIGH PRESSURE ALOFT BEGINS TO SHIFT TO THE EAST
DURING THE DAY SATURDAY ALLOW FOR SOUTHERLY FLOW AND RETURN OF
MOISTURE OVER NORTHERN ARIZONA WITH DEEPER MOISTURE BACK OVER THE
AREA BY SUNDAY.
CLEMMONS
.FGZ...FLASH FLOOD WATCH UNTIL 900 PM MST SUNDAY EVENING
       FOR YAVAPAI COUNTY...OAK CREEK AND SYCAMORE
       CANYONS...COCONINO PLATEAU AND GRAND CANYON COUNTRY.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 12:54 PM MSTSevere Thunderstorm WarningFGZApache36 min
Aug 13, 12:54 PM MSTSevere Thunderstorm WarningFGZNavajo36 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.