Alert archive / Minnesota / Dense Fog Advisories in 2014

Dense Fog Advisory 4, NWS Twin Cities, MN

August 18, 201415 counties in Minnesota

NWS Twin Cities, MN issued this dense fog advisory at Aug 18, 2014, 1:32 AM CDT for 15 counties in Minnesota. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Aug 18, 2014, 1:32 AM CDT (06:32 UTC)
Expired
Aug 18, 2014, 9:00 AM CDT
In force
7 hr
Issued by
NWS Twin Cities, MN

Counties Benton County, MN, Chippewa County, MN, Douglas County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Meeker County, MN, Morrison County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Yellow Medicine County, MN

The radar

The Minneapolis radar (KMPX), 137 km from the middle of the area, began a volume at 06:34 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

Minneapolis, MN (KMPX), launched 00:00Z, 6.5 hours before the alert went out and 135 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 2014-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 748 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 00:00Z on 2014-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.1939Sfc1 km3 km6 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
748 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
658 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this dense fog advisory went out at Aug 17, 11:17 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, Aug 17, 11:17 PM CDT, 2 hours 15 minutes before
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Hazardous weather outlook, Aug 17, 10:15 PM CDT, 3 hours 17 minutes before
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In the hours before

Local storm report, Aug 17, 8:16 PM CDT, 5 hours 16 minutes before
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Local storm report, Aug 17, 9:55 PM CDT, 3 hours 37 minutes before
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Special weather statement, Aug 18, 12:36 AM CDT, 56 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1236 AM CDT MON AUG 18 2014

MNZ085-093-180630-
FREEBORN-STEELE-
1236 AM CDT MON AUG 18 2014

...STRONG THUNDERSTORMS MOVING OVER FREEBORN AND STEELE COUNTIES
THROUGH 130 AM CDT...

AT 1229 AM CDT...WEATHER SERVICE RADAR WAS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTH OF ALBERT LEA
TO 11 MILES SOUTHWEST OF NORTHWOOD. THESE STORMS WERE MOVING
NORTHEAST AT 15 MPH.

PEA SIZE HAIL...WINDS UP TO 30 MPH...FREQUENT CLOUD TO GROUND
LIGHTNING...AND HEAVY DOWNPOURS ARE EXPECTED WITH THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  ALBERT LEA.
  CLARKS GROVE.
  MYRE BIG ISLAND STATE PARK.
  GLENVILLE.
  HAYWARD.
  GENEVA.
  HOLLANDALE.
  BIXBY.
  INTERSTATE 35 FROM THE IOWA BORDER TO EXIT 22.
  INTERSTATE 90 FROM EXIT 154 TO EXIT 175.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAIN IS OCCURRING WITH THIS LINE OF STORMS. PONDING OF
WATER ON ROADS AND FILLING OF ROADSIDE DITCHES AND GULLIES ARE
LIKELY TO OCCUR. MOTORISTS SHOULD USE EXTRA CAUTION AS REDUCED
VISIBILITY AND HYDROPLANING CAN OCCUR.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

&&

LAT...LON 4379 9341 4399 9304 4399 9303 4350 9304
      4349 9305 4349 9340
TIME...MOT...LOC 0532Z 239DEG 13KT 4375 9332 4330 9330

JPC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 12:36 AM CDTSpecial Weather StatementMPXFreeborn54 min
Aug 18, 6:29 AM CDTSpecial Weather StatementMPXTodd46 min
Aug 18, 4:42 PM CDTSpecial Weather StatementMPXPope63 min
Aug 18, 6:07 PM CDTSpecial Weather StatementMPXMartin38 min
Aug 18, 6:32 PM CDTSevere Thunderstorm WarningMPXFaribault, Martin28 min
Aug 18, 6:35 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Faribault, Waseca40 min
Aug 18, 6:56 PM CDTSevere Thunderstorm WarningMPXFaribault34 min
Aug 18, 11:49 AM CDTSpecial Weather StatementMPXPolk41 min
Aug 18, 12:38 PM CDTSpecial Weather StatementMPXBarron52 min
Aug 18, 12:57 PM CDTSpecial Weather StatementMPXDunn33 min
Aug 18, 1:14 PM CDTSpecial Weather StatementMPXDunn31 min
Aug 18, 1:43 PM CDTSpecial Weather StatementMPXDunn32 min
Aug 18, 2:00 PM CDTSevere Thunderstorm WarningMPXDunn30 min
Aug 18, 2:37 PM CDTSpecial Weather StatementMPXPepin53 min

Nearby

Dense Fog Advisories in Minnesota, 2014Every dense fog advisory in 2014

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.