Alert archive / Minnesota / Special Weather Statements in 2021

Special Weather Statement, NWS Twin Cities, MN

July 14, 2021Hennepin County, Minnesota

NWS Twin Cities, MN issued this special weather statement at Jul 14, 2021, 2:46 PM CDT for Hennepin County, Minnesota. It was in force for 89 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 14, 2021, 2:46 PM CDT (19:46 UTC)
Expired
Jul 14, 2021, 4:15 PM CDT
In force
89 min
Issued by
NWS Twin Cities, MN

County Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 23 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 23 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 2021-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2820 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 2021-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939587897117Sfc1 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
2820 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
1084 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

Open this sounding in Storm Lab

The text

As transmitted.

405 
WWUS83 KMPX 141946
SPSMPX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Twin Cities/Chanhassen MN
246 PM CDT Wed Jul 14 2021
 
MNC053-142115-
Hennepin-
246 PM CDT Wed Jul 14 2021

...URBAN AND SMALL STREAM FLOODING EXPECTED...

Heavy rain will cause minor flooding in the following counties... 

Hennepin...

* Until 415 PM CDT.

* At 245 PM CDT, Doppler radar indicated heavy rain that will cause
  urban and small stream flooding in the area. Up to two inches of
  rain have already fallen.

* Some locations that will experience flooding include...
  Brooklyn Park, Plymouth, Maple Grove, Mound, Orono, Minnetrista,
  Delano, Corcoran, Medina, Wayzata, Independence and Maple Plain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 4510 9332 4499 9351 4495 9360 4494 9377
      4505 9377 4513 9362 4516 9353

$$

TDH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 8:11 AM CDTSevere Thunderstorm WarningMPXFaribault, Martin64 min
Jul 14, 8:42 AM CDTSevere Thunderstorm WarningMPXFreeborn33 min
Jul 14, 9:08 AM CDTSpecial Weather StatementMPXFreeborn, Steele, Waseca52 min

Nearby

Special Weather Statements in Minnesota, 2021Every special weather statement in 2021

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.