Alert archive / Minnesota / Tornado Warnings in 2009

Tornado Warning 30, NWS Twin Cities, MN

August 8, 2009Anoka County, Ramsey County, Washington County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 8, 2009, 9:13 PM CDT for Anoka County, Ramsey County, Washington County, Minnesota. It was in force for 32 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 8, 2009, 9:13 PM CDT (02:13 UTC)
Expired
Aug 8, 2009, 9:45 PM CDT
In force
32 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Anoka County, MN, Ramsey County, MN, Washington County, MN

The radar

The Minneapolis radar (KMPX), 52 km from the middle of the area, began a volume at 02:16 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.

What was reported inside it

TimeReportWhereRemark
Aug 8, 9:16 PM CDTTSTM WND DMG1 N New Brighton, MNTREE DOWN ACROSS PATH IN LONG LAKE PARK.
Aug 8, 9:16 PM CDTTSTM WND DMG3 Se Blaine, MNTWO TREES DOWN IN THE CITY OF LEXINGTON AT RESTWOOD ROAD AND SYNDICATE AVENUE.
Aug 8, 9:45 PM CDTTSTM WND DMG1 Sse Hugo, MNTREE DOWN ACROSS ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 8, 3:46 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.2 hours before the alert went out and 54 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, Minneapolis, MN at 00:00Z on 2009-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3715 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2009-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 190 square meters per square second.19395878Sfc1 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
3715 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
841 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
190 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
3.8
Supercell composite
16.8

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KMPX 090213
TORMPX
MNC003-123-163-090245-
/O.NEW.KMPX.TO.W.0030.090809T0213Z-090809T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
913 PM CDT SAT AUG 8 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 945 PM CDT

* AT 911 PM CDT...RADAR WAS TRACKING A SEVERE STORM WITH STRONG
  ROTATION. THE MOST DANGEROUS PART OF THE STORM WAS NEAR FRIDLEY...
  AND MOVING EAST AT 35 MPH. THIS STORM HAS A HISTORY OF TORNADOES.

* LOCATIONS IN THE WARNING INCLUDE...
  FRIDLEY...
  MOUNDSVIEW...
  ARDEN HILLS...
  LEXINGTON...
  SHOREVIEW...
  CIRCLE PINES...
  VADNAIS HEIGHTS...
  NORTH OAKS...
  LINO LAKES...
  CENTERVILLE...
  WHITE BEAR LAKE...
  MAHTOMEDI...
  WILLERNIE...
  HUGO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY
BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

&&

LAT...LON 4520 9289 4505 9283 4504 9327 4513 9327
TIME...MOT...LOC 0212Z 257DEG 32KT 4509 9320

$$
1 follow-up statement
000 
WWUS53 KMPX 090231
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
931 PM CDT SAT AUG 8 2009

MNC003-123-163-090245-
/O.CON.KMPX.TO.W.0030.000000T0000Z-090809T0245Z/
ANOKA MN-WASHINGTON MN-RAMSEY MN-
931 PM CDT SAT AUG 8 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR 
NORTHEASTERN RAMSEY...NORTHERN WASHINGTON AND SOUTHEASTERN ANOKA 
COUNTIES...

AT 928 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG 
ROTATION.  THE MOST DANGEROUS PART OF THE STORM WAS NEAR NORTH 
OAKS...AND MOVING EAST AT 35 MPH. 

DO NOT GO OUTSIDE TO TRY TO SEE THE TORNADO. IT IS TOO DARK TO SEE 
THIS LATE AFTER SUNSET.

LOCATIONS IN THE WARNING INCLUDE...
WHITE BEAR LAKE...MAHTOMEDI...WILLERNIE...LINO LAKES...CENTERVILLE 
AND HUGO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OR PRODUCING TORNADOES AND LARGE DAMAGING
HAIL.

&&

LAT...LON 4504 9315 4516 9313 4520 9289 4505 9283
TIME...MOT...LOC 0229Z 257DEG 32KT 4513 9303

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 8, 8:31 PM CDTTornado WarningMPXHennepin29 min
Aug 8, 8:49 PM CDTTornado WarningMPXAnoka, Hennepin, Ramsey26 min
Aug 8, 9:43 PM CDTTornado WarningMPXWashington32 min
Aug 8, 10:01 PM CDTTornado WarningMPXWashington29 min
Aug 8, 10:14 PM CDTTornado WarningMPXWashington31 min

Nearby

Tornado Warnings in Minnesota, 2009Every tornado warning in 2009Tornadoes in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.