Alert archive / Minnesota / Heat Advisories in 2020

Heat Advisory 5, NWS Twin Cities, MN

July 7, 202035 counties in Minnesota; 6 counties in Wisconsin

NWS Twin Cities, MN issued this heat advisory at Jul 7, 2020, 3:05 PM CDT for 35 counties in Minnesota; 6 counties in Wisconsin. It took effect at Jul 8, 2020, 11:00 AM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jul 7, 2020, 3:05 PM CDT (20:05 UTC)
In effect from
Jul 8, 2020, 11:00 AM CDT
Expired
Jul 8, 2020, 8:00 PM CDT
In force
9 hr
Issued by
NWS Twin Cities, MN
All 41 counties

Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Swift County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 21 km from the middle of the area, began a volume at 20:06 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 12:00Z, 8.1 hours before the alert went out and 19 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 2020-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 239 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 2020-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
239 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
1216 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

515 
WWUS73 KMPX 072005
NPWMPX

URGENT - WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
305 PM CDT Tue Jul 7 2020

MNZ060>063-068>070-080600-
/O.NEW.KMPX.HT.Y.0005.200708T1700Z-200709T0000Z/
Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota-
Including the cities of Minneapolis, Blaine, St Paul, Stillwater,
Chanhassen, Chaska, Victoria, Shakopee, and Hastings
305 PM CDT Tue Jul 7 2020

...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM CDT WEDNESDAY...

* WHAT...Heat index values between 95 and 100 degrees expected.

* WHERE...Hennepin, Anoka, Ramsey, Washington, Carver, Scott and 
  Dakota Counties.

* WHEN...From noon to 7 PM CDT Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

MNZ059-066-067-075>078-083>085-092-093-WIZ023>028-080600-
/O.NEW.KMPX.HT.Y.0005.200708T1700Z-200709T0000Z/
Wright-McLeod-Sibley-Nicollet-Le Sueur-Rice-Goodhue-Blue Earth-
Waseca-Steele-Faribault-Freeborn-St. Croix-Pierce-Dunn-Pepin-
Chippewa-Eau Claire-
Including the cities of Monticello, Hutchinson, Gaylord, 
St Peter, Le Sueur, Faribault, Red Wing, Mankato, Waseca, 
Owatonna, Blue Earth, Albert Lea, Hudson, River Falls, Menomonie,
Durand, Chippewa Falls, and Eau Claire
305 PM CDT Tue Jul 7 2020

...HEAT ADVISORY IN EFFECT FROM NOON TO 7 PM CDT WEDNESDAY...

* WHAT...Heat index values around 100 degrees expected.

* WHERE...Portions of west central Wisconsin and central, south 
  central and southeast Minnesota.

* WHEN...From noon to 7 PM CDT Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$
5 follow-up statements
647 
WWUS73 KMPX 080400
NPWMPX

URGENT - WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
1100 PM CDT Tue Jul 7 2020

MNZ060>063-068>070-081200-
/O.CON.KMPX.HT.Y.0005.200708T1700Z-200709T0000Z/
Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota-
Including the cities of Minneapolis, Blaine, St Paul, Stillwater,
Chanhassen, Chaska, Victoria, Shakopee, and Hastings
1100 PM CDT Tue Jul 7 2020

...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TO 7 PM CDT
WEDNESDAY...

* WHAT...Heat index values between 95 and 100 degrees expected.

* WHERE...Hennepin, Anoka, Ramsey, Washington, Carver, Scott and 
  Dakota Counties.

* WHEN...From noon to 7 PM CDT Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

MNZ059-066-067-075>078-083>085-092-093-WIZ023>028-081200-
/O.CON.KMPX.HT.Y.0005.200708T1700Z-200709T0000Z/
Wright-McLeod-Sibley-Nicollet-Le Sueur-Rice-Goodhue-Blue Earth-
Waseca-Steele-Faribault-Freeborn-St. Croix-Pierce-Dunn-Pepin-
Chippewa-Eau Claire-
Including the cities of Monticello, Hutchinson, Gaylord, 
St Peter, Le Sueur, Faribault, Red Wing, Mankato, Waseca, 
Owatonna, Blue Earth, Albert Lea, Hudson, River Falls, Menomonie,
Durand, Chippewa Falls, and Eau Claire
1100 PM CDT Tue Jul 7 2020

...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TO 7 PM CDT
WEDNESDAY...

* WHAT...Heat index values around 100 degrees expected.

* WHERE...Portions of west central Wisconsin and central, south 
  central and southeast Minnesota.

* WHEN...From noon to 7 PM CDT Wednesday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

jrb
135 
WWUS73 KMPX 080739
NPWMPX

URGENT - WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
239 AM CDT Wed Jul 8 2020

MNZ060>063-068>070-081545-
/O.UPG.KMPX.HT.Y.0005.200708T1700Z-200709T0000Z/
/O.NEW.KMPX.EH.W.0001.200708T1600Z-200709T0100Z/
Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota-
Including the cities of Minneapolis, Blaine, St Paul, Stillwater,
Chanhassen, Chaska, Victoria, Shakopee, and Hastings
239 AM CDT Wed Jul 8 2020

...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM THIS MORNING TO
8 PM CDT THIS EVENING...

* WHAT...Dangerously hot conditions with heat index values up to
  103 expected.

* WHERE...Hennepin, Anoka, Ramsey, Washington, Carver, Scott and 
  Dakota Counties.

* WHEN...From 11 AM this morning to 8 PM CDT this evening.

* IMPACTS...Extreme heat and humidity will significantly 
  increase the potential for heat related illnesses, 
  particularly for those working or participating in outdoor 
  activities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

MNZ049>058-064-065-073-074-082-091-081545-
/O.EXB.KMPX.HT.Y.0005.200708T1600Z-200709T0100Z/
Stearns-Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-
Chippewa-Kandiyohi-Meeker-Yellow Medicine-Renville-Redwood-Brown-
Watonwan-Martin-
Including the cities of St Cloud, Sauk Rapids, Elk River, 
Cambridge, Center City, Madison, Benson, Montevideo, Willmar, 
Litchfield, Granite Falls, Olivia, Redwood Falls, New Ulm, 
St James, and Fairmont
239 AM CDT Wed Jul 8 2020

...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 8 PM CDT
THIS EVENING...

* WHAT...Heat index values up to 102 expected.

* WHERE...Portions of central, east central, south central, 
  southwest and west central Minnesota.

* WHEN...From 11 AM this morning to 8 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

MNZ059-066-067-075>078-083>085-092-093-WIZ023>028-081545-
/O.EXT.KMPX.HT.Y.0005.200708T1600Z-200709T0100Z/
Wright-McLeod-Sibley-Nicollet-Le Sueur-Rice-Goodhue-Blue Earth-
Waseca-Steele-Faribault-Freeborn-St. Croix-Pierce-Dunn-Pepin-
Chippewa-Eau Claire-
Including the cities of Monticello, Hutchinson, Gaylord, 
St Peter, Le Sueur, Faribault, Red Wing, Mankato, Waseca, 
Owatonna, Blue Earth, Albert Lea, Hudson, River Falls, Menomonie,
Durand, Chippewa Falls, and Eau Claire
239 AM CDT Wed Jul 8 2020

...HEAT ADVISORY NOW IN EFFECT FROM 11 AM THIS MORNING TO 8 PM
CDT THIS EVENING...

* WHAT...Heat index values up to 102 expected.

* WHERE...Portions of west central Wisconsin and central, south 
  central and southeast Minnesota.

* WHEN...From 11 AM this morning to 8 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

Borghoff
487 
WWUS73 KMPX 080921
NPWMPX

URGENT - WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
421 AM CDT Wed Jul 8 2020

MNZ060>063-068>070-081730-
/O.CON.KMPX.EH.W.0001.200708T1600Z-200709T0100Z/
Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota-
Including the cities of Minneapolis, Blaine, St Paul, Stillwater,
Chanhassen, Chaska, Victoria, Shakopee, and Hastings
421 AM CDT Wed Jul 8 2020

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 11 AM THIS
MORNING TO 8 PM CDT THIS EVENING...

* WHAT...Dangerously hot conditions with heat index values up to
  103 expected.

* WHERE...Scott, Carver, Washington, Ramsey, Anoka, Hennepin and 
  Dakota Counties.

* WHEN...From 11 AM this morning to 8 PM CDT this evening.

* IMPACTS...Extreme heat and humidity will significantly 
  increase the potential for heat related illnesses, 
  particularly for those working or participating in outdoor 
  activities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take extra precautions...if you work or spend time outside. When
possible...reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when possible
and drink plenty of water.

To reduce risk during outdoor work...the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an 
emergency...call 9 1 1.

An Excessive Heat Warning means that a prolonged period of
dangerously hot temperatures will occur. The combination of hot
temperatures and high humidity will combine to create a dangerous
situation in which heat illnesses are likely. Drink plenty of
fluids...stay in an air-conditioned room...stay out of the
sun...and check up on relatives and neighbors.

Young children and pets should never be left unattended in
vehicles under any circumstances. This is especially true during 
warm or hot weather when car interiors can reach lethal 
temperatures in a matter of minutes.

&&

$$

MNZ049>059-064>067-073>078-082>085-091>093-WIZ023>028-081730-
/O.CON.KMPX.HT.Y.0005.200708T1600Z-200709T0100Z/
Stearns-Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-
Chippewa-Kandiyohi-Meeker-Wright-Yellow Medicine-Renville-McLeod-
Sibley-Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-
Blue Earth-Waseca-Steele-Martin-Faribault-Freeborn-St. Croix-
Pierce-Dunn-Pepin-Eau Claire-
Including the cities of St Cloud, Sauk Rapids, Elk River, 
Cambridge, Center City, Madison, Benson, Montevideo, Willmar, 
Litchfield, Monticello, Granite Falls, Olivia, Hutchinson, 
Gaylord, Redwood Falls, New Ulm, St Peter, Le Sueur, Faribault, 
Red Wing, St James, Mankato, Waseca, Owatonna, Fairmont, 
Blue Earth, Albert Lea, Hudson, River Falls, Menomonie, Durand, 
Chippewa Falls, and Eau Claire
421 AM CDT Wed Jul 8 2020

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
8 PM CDT THIS EVENING...

* WHAT...Heat index values up to 102 expected.

* WHERE...Portions of west central Wisconsin and central, east 
  central, south central, southeast, southwest and west central 
  Minnesota.

* WHEN...From 11 AM this morning to 8 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

Borghoff
876 
WWUS73 KMPX 081922
NPWMPX

URGENT - WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
222 PM CDT Wed Jul 8 2020

MNZ060>063-068>070-090100-
/O.CON.KMPX.EH.W.0001.000000T0000Z-200709T0100Z/
Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota-
Including the cities of Minneapolis, Blaine, St Paul, Stillwater,
Chanhassen, Chaska, Victoria, Shakopee, and Hastings
222 PM CDT Wed Jul 8 2020

* WHAT...Dangerously hot conditions with heat index values up to
  103 expected.

* WHERE...Scott, Carver, Washington, Ramsey, Anoka, Hennepin and 
  Dakota Counties.

* WHEN...Through 8 PM CDT this evening.

* IMPACTS...Extreme heat and humidity will significantly 
  increase the potential for heat related illnesses, 
  particularly for those working or participating in outdoor 
  activities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take extra precautions...if you work or spend time outside. When
possible...reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when possible
and drink plenty of water.

To reduce risk during outdoor work...the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an 
emergency...call 9 1 1.

An Excessive Heat Warning means that a prolonged period of
dangerously hot temperatures will occur. The combination of hot
temperatures and high humidity will combine to create a dangerous
situation in which heat illnesses are likely. Drink plenty of
fluids...stay in an air-conditioned room...stay out of the
sun...and check up on relatives and neighbors.

Young children and pets should never be left unattended in
vehicles under any circumstances. This is especially true during 
warm or hot weather when car interiors can reach lethal 
temperatures in a matter of minutes.

&&

$$

MNZ049>059-064>067-073>078-082>085-091>093-WIZ023>028-090100-
/O.CON.KMPX.HT.Y.0005.000000T0000Z-200709T0100Z/
Stearns-Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-
Chippewa-Kandiyohi-Meeker-Wright-Yellow Medicine-Renville-McLeod-
Sibley-Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-
Blue Earth-Waseca-Steele-Martin-Faribault-Freeborn-St. Croix-
Pierce-Dunn-Pepin-Eau Claire-
Including the cities of St Cloud, Sauk Rapids, Elk River, 
Cambridge, Center City, Madison, Benson, Montevideo, Willmar, 
Litchfield, Monticello, Granite Falls, Olivia, Hutchinson, 
Gaylord, Redwood Falls, New Ulm, St Peter, Le Sueur, Faribault, 
Red Wing, St James, Mankato, Waseca, Owatonna, Fairmont, 
Blue Earth, Albert Lea, Hudson, River Falls, Menomonie, Durand, 
Chippewa Falls, and Eau Claire
222 PM CDT Wed Jul 8 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING...

* WHAT...Heat index values up to 102 expected.

* WHERE...Portions of west central Wisconsin and central, east 
  central, south central, southeast, southwest and west central 
  Minnesota.

* WHEN...Through 8 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$
304 
WWUS73 KMPX 090117
NPWMPX

URGENT - WEATHER MESSAGE
National Weather Service Twin Cities/Chanhassen MN
817 PM CDT Wed Jul 8 2020

MNZ060>063-068>070-090230-
/O.EXP.KMPX.EH.W.0001.000000T0000Z-200709T0100Z/
Hennepin-Anoka-Ramsey-Washington-Carver-Scott-Dakota-
Including the cities of Minneapolis, Blaine, St Paul, Stillwater,
Chanhassen, Chaska, Victoria, Shakopee, and Hastings
817 PM CDT Wed Jul 8 2020

...EXCESSIVE HEAT WARNING HAS EXPIRED...

Temperatures will continue to cool this evening and overnight, 
and the next few days will be cooler as well.

$$

MNZ049>059-064>067-073>078-082>085-091>093-WIZ023>028-090230-
/O.EXP.KMPX.HT.Y.0005.000000T0000Z-200709T0100Z/
Stearns-Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-
Chippewa-Kandiyohi-Meeker-Wright-Yellow Medicine-Renville-McLeod-
Sibley-Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-
Blue Earth-Waseca-Steele-Martin-Faribault-Freeborn-St. Croix-
Pierce-Dunn-Pepin-Eau Claire-
Including the cities of St Cloud, Sauk Rapids, Elk River, 
Cambridge, Center City, Madison, Benson, Montevideo, Willmar, 
Litchfield, Monticello, Granite Falls, Olivia, Hutchinson, 
Gaylord, Redwood Falls, New Ulm, St Peter, Le Sueur, Faribault, 
Red Wing, St James, Mankato, Waseca, Owatonna, Fairmont, 
Blue Earth, Albert Lea, Hudson, River Falls, Menomonie, Durand, 
Chippewa Falls, and Eau Claire
817 PM CDT Wed Jul 8 2020

...HEAT ADVISORY HAS EXPIRED...

Temperatures will continue to cool this evening and overnight, 
and the next few days will be cooler as well.

$$

jrb

What forecasters said that day

The local office's own words before this heat 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 heat advisory went out at Jul 7, 1:31 PM CDT, 1 hour 34 minutes earlier.

Area forecast discussion, Jul 7, 1:31 PM CDT, 1 hour 34 minutes before
Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
131 PM CDT Tue Jul 7 2020

.UPDATE...
Issued at 120 PM CDT Tue Jul 7 2020

Updated to include 18z aviation discussion below.

&&

.SHORT TERM...(Today through Wednesday)
Issued at 326 AM CDT Tue Jul 7 2020

A lackluster stationary front continues to cut across central MN,
with a few areas of fog lingering this morning as winds remain
extraordinarily weak and look to remain as such for most of today.
Shortwave energy is producing the weakening convection over eastern
South Dakota, with the movement looking to be east-southeast which
could clip southwestern MN this morning. Most CAMs have this
activity weakening over the next few hours but a few rumbles of
thunder and brief showers in the southwest are possible by around
sunrise.

As the morning convection wanes, we can expect a similar day overall
to the previous few days as far as how it feels, with warm and humid
weather continuing. Temperatures will peak in the mid 80s for most
with upper 80s for the metro with mainly high clouds and plenty of
sunshine. Another shortwave begins to push into MN from ND by the
evening which could spur some showers and storms, however the better
activity looks to remain confined to the 925-850mb jet which remains
west/northwest of the MPX coverage area. If the position of that jet
were to shift east/southeast just a bit, we could end up seeing the
potential for training storms and showers in west-central MN. While
the threat of flash flooding is there if that does happen, this area
also sorely needs the rainfall as it remains in abnormally dry to
even D1 moderate drought conditions. Plenty of instability combined
with decent mid level lapse rates will give us a risk for severe
storms as well, however this is relying heavily on the forcing from
the low level jet as we don't have another trigger to set off storms
until a cold front arrives later in the day tomorrow. Our best PoPs
remain in the northwest where the jet forcing is the strongest,
however there is still some wiggle room in where it will eventually
end up.

.LONG TERM...(Wednesday night through Monday)
Issued at 326 AM CDT Tue Jul 7 2020

The last half of the week we look to be under the influence of
progressive semi-zonal flow, which will mean continuance of stormy
weather and seasonably warm temps.

On Wednesday night the cold front looks to be passing across the
area, while shortwave energy in the base of the mid-level low over
Saskatchewan/Manitoba progresses across the area. Instability ahead
of the front is more than sufficient to support severe storms,
although deep layer shear is displaced behind the front, which could
potentially hinder storm organization. Showers and thunderstorms
look to continue along the front through much of the overnight
hours, with a quick inch+ of rain for a good portion of the forecast
area given these storms should be pretty sufficient rainfall
producers given precipitable water values in the 1.75-2.0 inch
range. The threat for flooding issues is pretty marginal however
given these storms will be transient (as compared to storms over the
last week that were nearly stationary given the lack of steering
flow under the mid-level ridge).

Showers and thunderstorms look to linger in the east and south on
Thursday near the boundary as another shortwave passes. Friday looks
to be a dry day in between shortwaves, but then another shortwave
trough tops the Four Corners mid-level ridge on Saturday. There are
still some model differences regarding placement of the forcing
sufficient for showers and thunderstorms, so at this point 40% POPS
seem about right.

Heading into next week the heat and humidity will build back up a
bit again as the southwestern CONUS ridge builds toward the Plains.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 120 PM CDT Tue Jul 7 2020

VFR conditions expected for all TAFs throughout this forecast
package. Mainly high clouds streaming across the area though there
will be some mid-level cumulus clouds near the sites from time to
time this afternoon through sunset. Same situation tomorrow though
with a little more coverage mid-to-late day as thunderstorm
coverage is expected to increase late day, but that is not
expected until after 18z tomorrow. Winds will continue out of the
SE 5-10kt through daybreak Wednesday then become more southerly
with an increase in speeds.

KMSP...No additional concerns.

/OUTLOOK FOR KMSP/
Thu...Mainly VFR with TSRA/MVFR early. Wind SW 5-10 kts.
Fri...VFR. Wind NW 5 kts.
Sat...Mainly VFR. Chance TSRA/MVFR. Wind W to NW 5 kts.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
&&

UPDATE...JPC
SHORT TERM...TDH
LONG TERM...LS
AVIATION...JPC
Hazardous weather outlook, Jul 7, 12:44 PM CDT, 2 hours 21 minutes before
Hazardous Weather Outlook
National Weather Service Twin Cities/Chanhassen MN
1244 PM CDT Tue Jul 7 2020

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
081200-
Douglas-Todd-Morrison-Mille Lacs-Kanabec-Stevens-Pope-Stearns-
Benton-Sherburne-Isanti-Chisago-Lac Qui Parle-Swift-Chippewa-
Kandiyohi-Meeker-Wright-Hennepin-Anoka-Ramsey-Washington-
Yellow Medicine-Renville-McLeod-Sibley-Carver-Scott-Dakota-
Redwood-Brown-Nicollet-Le Sueur-Rice-Goodhue-Watonwan-Blue Earth-
Waseca-Steele-Martin-Faribault-Freeborn-Polk-Barron-Rusk-
St. Croix-Pierce-Dunn-Pepin-Eau Claire-
1244 PM CDT Tue Jul 7 2020

This Hazardous Weather Outlook is for portions of central and
southern Minnesota...and west central Wisconsin.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Periodic thunderstorms are expected through much of this week.
There is a Slight Risk of severe storms across much of the
coverage area Wednesday. The main hazards are large hail and
damaging winds. In addition, some thunderstorms may contain heavy
rain and frequent lightning.

Heat indices in the mid to upper 90s are possible on Wednesday
afternoon and early evening.

.SPOTTER INFORMATION STATEMENT...

SKYWARN spotter activation will not be needed through tonight but
may be needed Wednesday afternoon and evening.

In the hours before

Special weather statement, Jul 7, 12:48 PM CDT, 2 hours 17 minutes before
Special Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1248 PM CDT Tue Jul 7 2020

MNZ093-071830-
Freeborn-
1248 PM CDT Tue Jul 7 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN FREEBORN COUNTY
THROUGH 130 PM CDT...

At 1247 PM CDT, a strong thunderstorm was located near Northwood,
moving northeast at 20 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
London and Myrtle.

This includes Interstate 90 near mile marker 173.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4368 9306 4350 9305 4350 9331
TIME...MOT...LOC 1747Z 239DEG 19KT 4350 9318

JPC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 5:50 AM CDTSpecial Weather StatementMPXRenville55 min
Jul 7, 12:48 PM CDTSpecial Weather StatementMPXFreeborn42 min

Nearby

Heat Advisories in Minnesota, 2020Heat Advisories in Wisconsin, 2020Every heat advisory in 2020

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.