Alert archive / Alaska / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 21, NWS Anchorage, AK

July 20, 2005

NWS Anchorage, AK issued this severe thunderstorm warning at Jul 20, 2005, 11:07 AM AKDT. It took effect at Jul 20, 2005, 4:07 PM AKDT. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2005, 11:07 AM AKDT (19:07 UTC)
In effect from: Jul 20, 2005, 4:07 PM AKDT
Expired: Jul 20, 2005, 4:30 PM AKDT
In force: 23 min
Issued by: NWS Anchorage, AK
Area: Counties, with a storm outline in the text

The nearest sounding before it

Anchorage Iap/Pt. Campbe, (PANC), launched 12:00Z, 7.1 hours before the alert went out and 55 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: 6 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 80 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
WUAK58 PAFC 210008
SVRAFC
AKZ111-210030-
/O.NEW.PAFC.SV.W.0021.050721T0007Z-050721T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ANCHORAGE AK
407 PM ADT WED JUL 20 2005

THE NATIONAL WEATHER SERVICE IN ANCHORAGE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MATANUSKA VALLEY AREA OF ALASKA
  THIS INCLUDES THE CITY OF WASILLA

* UNTIL 430 PM ADT

* AT 400 PM ADT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR WASILLA...AND MOVING SOUTH AT 5 MPH.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. 
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG 
BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 6162 14910 6169 14946 6144 14969 6136 14925

$$

SEB

1 follow-up statement

000
WWAK58 PAFC 210025
SVSAFC
AKZ111-210030-
/O.CON.PAFC.SV.W.0021.000000T0000Z-050721T0030Z/

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ANCHORAGE AK
423 PM ADT WED JUL 20 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 430 PM ADT FOR
MATANUSKA VALLEY ...

AT 418 PM ADT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL. THIS STORM WAS LOCATED OVER THE NORTHERN PART OF 
WASILLA...MOVING SOUTH AT 5 MPH ACROSS DOWNTOWN WASILLA AND TOWARD 
THE PALMER HAY FLATS.

LAT...LON 6162 14908 6142 14918 6146 14923 6148 14918       6151 
14923 6148 14928 6149 14942 6151 14947
      6149 14961 6169 14941

$$

SEB

The office that day

Everything else NWS Anchorage, AK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 11:00 PM AKDT	Small Craft Advisory	AFC		12 hr

Nearby

Severe Thunderstorm Warnings in Alaska, 2005 Every severe thunderstorm warning in 2005

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.