Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 73, NWS Twin Cities, MN

May 19, 20126 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 19, 2012, 6:36 PM CDT for 6 counties in Minnesota. It was in force for 54 min. 4 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
May 19, 2012, 6:36 PM CDT (23:36 UTC)
Expired
May 19, 2012, 7:30 PM CDT
In force
54 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Anoka County, MN, Chisago County, MN, Dakota County, MN, Hennepin County, MN, Ramsey County, MN, Washington County, MN

The radar

The Minneapolis radar (KMPX), 61 km from the middle of the area, began a volume at 23:40 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
May 19, 7:34 PM CDTHAIL 15 Sw St Paul, MN
May 19, 7:35 PM CDTHAIL 1.75St Paul, MNWESTERN ST. PAUL
May 19, 7:38 PM CDTHAIL 0.882 Nw St Paul, MN
May 19, 7:40 PM CDTHAIL 0.751 Wsw St Paul, MN

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.6 hours before the alert went out and 63 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 12:00Z on 2012-05-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2012-05-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 square meters per square second.193958Sfc1 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
23 J/kg
Mixed-layer CIN
-352 J/kg
Mixed-layer LCL
1615 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
147 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.

519 
WUUS53 KMPX 192336
SVRMPX
MNC003-025-037-053-123-163-200030-
/O.NEW.KMPX.SV.W.0073.120519T2336Z-120520T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
636 PM CDT SAT MAY 19 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  NORTH CENTRAL DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  EAST CENTRAL HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  RAMSEY COUNTY IN EAST CENTRAL MINNESOTA...
  WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 730 PM CDT

* AT 635 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR LILYDALE...OR ABOUT OVER MINNEAPOLIS...AND
  MOVING NORTHEAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ST PAUL...
  FOREST LAKE...
  TWIN CITIES AIRPORT...
  MENDOTA HEIGHTS...
  RICHFIELD...
  INVER GROVE HEIGHTS...
  LILYDALE...
  ST PAUL PARK...
  WEST ST PAUL...
  SOUTH ST PAUL...
  LAUDERDALE...
  NEWPORT...
  FALCON HEIGHTS...
  ROSEVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4537 9268 4536 9270 4532 9271 4528 9277
      4517 9275 4485 9287 4477 9303 4490 9336
      4491 9321 4512 9322 4541 9303
TIME...MOT...LOC 2336Z 220DEG 32KT 4494 9318
WIND...HAIL 60MPH 1.00IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 8:21 PM CDTSpecial Weather StatementMPXRedwood39 min
May 18, 9:34 PM CDTSpecial Weather StatementMPXKandiyohi41 min
May 18, 9:45 PM CDTSevere Thunderstorm WarningMPXKandiyohi45 min
May 18, 10:48 PM CDTSevere Thunderstorm WarningMPXStearns27 min
May 18, 11:13 PM CDTSevere Thunderstorm WarningMPXStearns, Todd47 min
May 18, 11:46 PM CDTSevere Thunderstorm WarningMPXTodd23 min
May 19, 4:38 PM CDTSevere Thunderstorm WarningMPXRenville32 min
May 19, 5:17 PM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley58 min
May 19, 5:53 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Wright52 min
May 19, 6:17 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin43 min
May 19, 6:33 PM CDTSevere Thunderstorm WarningMPXHennepin, Sherburne27 min
May 19, 6:54 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Isanti38 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012Every severe thunderstorm warning in 2012

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.