What a tornado outbreak looked like on Doppler radar…in 1965

May 6th, 1965 is a day that will live in weather infamy for long time Twin Cities residents.

On this date 50 years ago, a swarm of thunderstorms spawned a half-dozen tornadoes that danced across the Land of 10,000 Lakes.  6 tornadoes touched down that night, including a F4 that tore across the heavily populated cities of Minneapolis, Fridley and Mounds View. 13 people perished, another 683 were injured.

For the National Weather Service Twin Cities, it was one of their first exercises in issuing tornado warnings using Doppler radar. The above video shows you exactly what meteorologists were seeing as the twisters touched down that evening. Compare that to the Doppler radar image below of a tornadic storm near Oklahoma City 50 years later.

Tornado05062015OKC

The 1965 radar images seem primitive, don’t they?

There is a common thread with the old WSR-57 Doppler radar technology and today’s NEXRAD imagery. In the video above, you can depict several hook echos from that night. This is a classic signature indicating a severe thunderstorm has rotation, thus the potential for producing a tornado. 50 years later, meteorologists like yours truly continue to look for that familiar hook echo.

Click here to read the outstanding recap of the 1965 Twin Cities tornado outbreak, compiled by the National Weather Service Twin Cities.

Advertisements

Wednesday’s Tucson Forecast: Spring breezes return to the Sonoran Desert

TODAY’S BLOGCAST

THE CLIFF NOTES

7DayForecast050615

Today – Partly cloudy, breezy. 85°, west-southwest wind 15-30 MPH.

Tonight – Mostly clear. 58°, southeast wind 5 MPH.

Tomorrow – Mostly sunny, breezy. 83°, west wind 15-30 MPH.

TODAY’S FORECAST DISCUSSION

10410187_427958610662518_4765059938164797104_n

The Sonoran Wind Machine is back.

A cold front digging down the West Coast develops 15-30 MPH west-southwest winds today. Under partly cloudy skies, daytime highs reach the mid 80s in Tucson. Gusty winds up to 30 MPH remain in the forecast through Friday, as high temps drop to the upper 70s heading into the weekend.

Thanks to recent rainfall, the blowing dust and wildfire threat are marginal the next few days.

High pressure builds in early next week, supplying warmer temperatures. Mother’s Day peaks in the low 80s under mostly sunny skies, with the 90s returning Monday and Tuesday.

Tuesday’s Tucson Forecast: Showers cease, breezes making a comeback

TODAY’S BLOGCAST

THE CLIFF NOTES

7DayForecast050515

Today – Partly cloudy. 82°, west wind 10-15 MPH.

Tonight – Mostly clear. 60°, southeast wind 5-10 MPH.

Tomorrow – Partly cloudy, breezy. 85°, southwest wind 15-25 MPH.

TODAY’S WEATHER STORY

hrrr_ref_phoenix_7_050515

The rain wraps up, but much of the week looks cool for May standards.

Highs this afternoon run 5-7° below average. Metro Tucson reaches the low 80s under partly cloudy skies. A stray shower can’t be ruled out for Mt. Lemmon, Graham and Greenlee Counties through late this afternoon.

Mid to late week features a return of the Sonoran Wind Machine, as a cold front approaches from the Pacific Northwest. Southwest winds up to 25 MPH are possible tomorrow and Thursday, increasing to 30 MPH Friday. Daytime highs range from the mid 80s Wednesday to the mid 70s Saturday afternoon. Mountains stand a slight chance of showers for the first half of the weekend as the front departs.

High pressure builds in early next week, returning ample sunshine and 80s just in time for Mother’s Day.

TODAY’S WEATHER HEADLINES

Courtesy: Greg McCown
Monday Night Lights – Courtesy: Greg McCown

How much rain fell in your backyard last night? Metro Tucson rain totals here.

While you were sleeping, a magnitude 3.2 quake rumbled north of Sedona. (USGS)

Hello Ana? Chance of subtropical development off the Florida coast the next few days. (Weather.com)

Monday’s rainfall totals across Metro Tucson

RAIN050415

The calendar said May 4th, but it certainly felt more like August 4th.

Officially 0.03″ rain was recorded Monday at Tucson International Airport. For the first time in recorded history, rainfall of at least a trace was registered on May 2nd, 3rd and 4th.

Biggest rainfall winners resided northwest and southeast of Tucson city limits. A rather impressive 1.03″ rain was reported by a storm spotter in Corona de Tucson. Casa de Beamish in Oro Valley had a cool 0.25″ rain.

How much fell in your backyard? Below is a complete list of rainfall totals compiled by the National Weather Service.

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
520 AM MST TUE MAY 5 2015

…RAINFALL REPORTS PAST 24 HOURS …

LOCATION AMOUNT TIME/DATE LAT/LON

…COCHISE COUNTY…
4 NW HUACHUCA CITY 0.46 IN 0516 AM 05/05 31.68N/110.39W
BONITA CANYON NEAR CHIRICAHU 0.41 IN 0445 AM 05/05 32.02N/109.35W
HEADQUARTERS 0.18 IN 0437 AM 05/05 32.01N/109.36W
23 N BENSON 0.17 IN 0510 AM 05/05 32.29N/110.37W
6 E SAINT DAVID 0.16 IN 0451 AM 05/05 31.89N/110.13W
9 ESE SAINT DAVID 0.15 IN 0448 AM 05/05 31.86N/110.08W
21 WNW RODEO 0.12 IN 0454 AM 05/05 32.02N/109.32W
MULESHOE RANCH 0.10 IN 0503 AM 05/05 32.40N/110.27W
21 WNW RODEO 0.05 IN 0447 AM 05/05 32.00N/109.34W
14 NW WILLCOX 0.05 IN 0508 AM 05/05 32.42N/109.98W
6 SE SIERRA VISTA 0.04 IN 0507 AM 05/05 31.50N/110.26W
3 WSW BENSON 0.04 IN 0512 AM 05/05 31.94N/110.35W
14 SSW WILLCOX 0.04 IN 0512 AM 05/05 32.06N/109.95W
2 NW RODEO 0.02 IN 0453 AM 05/05 31.86N/109.06W
RUCKER 0.02 IN 0357 AM 05/05 31.76N/109.35W
24 ESE WILLCOX 0.01 IN 0506 AM 05/05 32.15N/109.44W
23 WNW RODEO 0.01 IN 0514 AM 05/05 32.04N/109.35W
8 ENE HUACHUCA CITY 0.01 IN 0415 AM 05/05 31.70N/110.23W
10 E TOMBSTONE 0.01 IN 0508 AM 05/05 31.72N/109.88W
1 SSW SAINT DAVID 0.01 IN 0506 AM 05/05 31.88N/110.24W

…GRAHAM COUNTY…
16 ENE MAMMOTH 0.88 IN 1248 AM 05/05 32.86N/110.40W
COLUMBINE 0.52 IN 0402 AM 05/05 32.70N/109.91W
DRY LAKE 0.39 IN 0427 AM 05/05 33.36N/109.83W
16 NNE BYLAS 0.34 IN 0430 AM 05/05 33.36N/110.03W
7 SW THATCHER 0.26 IN 0415 AM 05/05 32.74N/109.84W
24 SSE EAST FORK 0.18 IN 0430 AM 05/05 33.48N/109.76W
BLACK HILLS 0.14 IN 0353 AM 05/05 33.08N/109.95W
NOON CREEK 0.11 IN 0401 AM 05/05 32.67N/109.79W
12 NE SAFFORD 0.09 IN 0430 AM 05/05 32.96N/109.53W
SAFFORD MUNI AP 0.02 IN 0451 AM 05/05 32.85N/109.63W

…GREENLEE COUNTY…
15 S THREE FORKS 0.58 IN 0500 AM 05/05 33.63N/109.33W
HANNAGAN MEADOWS 0.50 IN 0400 AM 05/05 33.65N/109.31W
BEAVER HEAD 0.40 IN 0400 AM 05/05 33.69N/109.22W
TRAIL CABIN 0.32 IN 0435 AM 05/05 33.26N/109.37W
STRAY HORSE 0.30 IN 0419 AM 05/05 33.55N/109.32W
17 WSW ALMA 0.26 IN 0500 AM 05/05 33.29N/109.20W
12 SSE THREE FORKS 0.26 IN 0430 AM 05/05 33.68N/109.27W
EAGLE CK ABV PUMPING PLT 0.09 IN 0400 AM 05/05 33.06N/109.44W
GUTHRIE 0.08 IN 0503 AM 05/05 32.88N/109.31W
1 NNE DUNCAN 0.04 IN 0511 AM 05/05 32.75N/109.08W

…PIMA COUNTY…
SAMANIEGO PEAK 0.99 IN 1214 AM 05/05 32.47N/110.82W
CATALINA STATE PARK 0.95 IN 0111 AM 05/05 32.45N/110.88W
8 WNW TUCSON 0.74 IN 0513 AM 05/05 32.25N/111.03W
15 ENE GREEN VALLEY 0.72 IN 0515 AM 05/05 31.95N/110.77W
11 W TUCSON 0.63 IN 0501 AM 05/05 32.20N/111.09W
PARK TANK 0.63 IN 1144 PM 05/04 32.26N/110.55W
SAGUARO NATIONAL PARK 0.52 IN 0349 AM 05/05 32.18N/110.74W
RINCON 0.49 IN 0437 AM 05/05 32.21N/110.55W
9 NE TUCSON 0.48 IN 0415 AM 05/05 32.32N/110.81W
5 WSW ORO VALLEY 0.43 IN 0445 AM 05/05 32.40N/111.06W
8 NNE GREEN VALLEY 0.42 IN 0508 AM 05/05 31.96N/110.98W
5 SSW ORO VALLEY 0.39 IN 0515 AM 05/05 32.36N/111.01W
CATALINA 0.39 IN 0509 AM 05/05 32.48N/110.91W
MT LEMMON ALERT 0.39 IN 0101 AM 05/05 32.44N/110.79W
8 E TUCSON 0.37 IN 0513 AM 05/05 32.19N/110.74W
9 NNE TUCSON 0.36 IN 0516 AM 05/05 32.33N/110.84W
11 ESE GREEN VALLEY 0.36 IN 0505 AM 05/05 31.76N/110.85W
FLORIDA CANYON 0.36 IN 1133 PM 05/04 31.76N/110.85W
5 SE MARANA 0.35 IN 0246 AM 05/05 32.36N/111.11W
10 E TUCSON 0.32 IN 0512 AM 05/05 32.22N/110.72W
6 ENE TUCSON 0.32 IN 0512 AM 05/05 32.24N/110.78W
6 ESE MARANA 0.31 IN 0509 AM 05/05 32.37N/111.07W
4 S ORO VALLEY 0.30 IN 0501 AM 05/05 32.35N/110.96W
8 SE TUCSON 0.30 IN 0504 AM 05/05 32.10N/110.80W
GOLDER RANCH BRIDGE 0.27 IN 1127 PM 05/04 32.48N/110.90W
HILLTOP RD. NEAR THREE POINT 0.27 IN 0247 AM 05/05 32.04N/111.24W
SAGUARO 0.26 IN 0508 AM 05/05 32.31N/110.82W
1 SW ORO VALLEY 0.25 IN 0513 AM 05/05 32.41N/110.99W
AJO 0.24 IN 0502 AM 05/05 32.38N/112.86W
GREEN MOUNTAIN 0.24 IN 0152 AM 05/05 32.39N/110.69W
PICTURE ROCK COMMUNITY CENTE 0.24 IN 0303 AM 05/05 32.31N/111.24W
SCOUT CAMP 0.24 IN 0501 AM 05/05 32.40N/110.72W
DEQ RUTHRAUFF RD. AT LA CHOL 0.24 IN 1234 AM 05/05 32.29N/111.01W
6 E TUCSON 0.23 IN 0209 AM 05/05 32.21N/110.78W
4 W ORO VALLEY 0.22 IN 0515 AM 05/05 32.43N/111.04W
7 ENE TUCSON 0.22 IN 0507 AM 05/05 32.25N/110.79W
12 ENE TUCSON 0.21 IN 0512 AM 05/05 32.29N/110.73W
6 ESE MARANA 0.20 IN 0503 AM 05/05 32.38N/111.07W
PANTANO HOUGHTON 0.20 IN 0155 AM 05/05 32.17N/110.77W
MILEWIDE 0.19 IN 1138 PM 05/04 32.25N/111.24W
15 ESE TUCSON 0.18 IN 0501 AM 05/05 32.06N/110.68W
8 ENE TUCSON 0.18 IN 0512 AM 05/05 32.27N/110.77W
ORO VALLEY 0.18 IN 0505 AM 05/05 32.42N/110.98W
9 N GREEN VALLEY 0.17 IN 0515 AM 05/05 31.99N/110.98W
4 W ORO VALLEY 0.17 IN 0512 AM 05/05 32.43N/111.04W
7 ENE TUCSON 0.16 IN 0508 AM 05/05 32.25N/110.79W
SALCIDO PLACE 0.16 IN 1238 AM 05/05 32.04N/110.49W
VENTANA SUNRISE 0.16 IN 1235 AM 05/05 32.31N/110.84W
ALDER CANYON NEAR MT. LEMMON 0.15 IN 0135 AM 05/05 32.48N/110.65W
7 SSE ORO VALLEY 0.15 IN 0515 AM 05/05 32.33N/110.91W
CATALINA BOOSTER 0.15 IN 1228 AM 05/05 32.28N/110.77W
13 ESE AJO 0.15 IN 0354 AM 05/05 32.32N/112.66W
8 ESE CATALINA 0.14 IN 0510 AM 05/05 32.44N/110.76W
5 ENE TUCSON 0.14 IN 0501 AM 05/05 32.22N/110.80W
16 E TUCSON 0.13 IN 0511 AM 05/05 32.15N/110.61W
RANCH ROAD 0.12 IN 0112 AM 05/05 32.31N/110.61W
WELL D-37 0.12 IN 1214 AM 05/05 32.23N/110.79W
WHITE TANK 0.12 IN 1209 AM 05/05 32.30N/110.57W
AC PARK 0.11 IN 0134 AM 05/05 32.28N/110.73W
8 SSE PICTURE ROCKS 0.11 IN 0504 AM 05/05 32.24N/111.19W
RANDOLPH GOLF COURSE 0.11 IN 1237 AM 05/05 32.21N/110.92W
20 SSE SAN MANUEL 0.11 IN 0418 AM 05/05 32.33N/110.54W
10 NE TUCSON 0.09 IN 0512 AM 05/05 32.30N/110.76W
TUCSON 3.1 ENE 0.08 IN 0400 AM 05/05 32.24N/110.88W
CRAYCROFT AT GOLF LINKS 0.08 IN 0301 AM 05/05 32.19N/110.88W
7 ESE TUCSON 0.07 IN 0505 AM 05/05 32.16N/110.77W
CIENEGA CREEK 0.06 IN 0500 AM 05/05 31.87N/110.57W
3 ENE TUCSON 0.06 IN 0516 AM 05/05 32.23N/110.84W
ARROYO CHICO AT CHERRY 0.04 IN 1229 AM 05/05 32.22N/110.95W
ANAMAX 0.04 IN 1121 PM 05/04 31.88N/111.05W
ALAMO WASH 0.04 IN 1248 AM 05/05 32.26N/110.88W
FINGER ROCK WASH AT SKYLINE 0.04 IN 1210 AM 05/05 32.32N/111.90W
4 SW TUCSON 0.03 IN 0454 AM 05/05 32.14N/110.94W
TUCSON INTERNATIONAL AIRPORT 0.03 IN 0453 AM 05/05 32.13N/110.96W
3 ESE TUCSON 0.01 IN 0508 AM 05/05 32.17N/110.84W
DAVIS MONTHAN AFB 0.01 IN 0458 AM 05/05 32.33N/111.00W
EMPIRE 0.01 IN 0453 AM 05/05 31.78N/110.64W

…PINAL COUNTY…
ORACLE 0.79 IN 0515 AM 05/05 32.61N/110.78W
FLORENCE BLACK HILL 0.47 IN 0223 AM 05/05 33.01N/111.28W
10 SSW PERIDOT 0.21 IN 0415 AM 05/05 33.17N/110.53W
5 WNW KEARNY 0.13 IN 0430 AM 05/05 33.10N/110.98W
HORSE CAMP 0.13 IN 0402 AM 05/05 32.94N/110.49W
6 SE FLORENCE 0.12 IN 0455 AM 05/05 32.96N/111.32W
8 ESE DUDLEYVILLE 0.02 IN 0345 AM 05/05 32.84N/110.62W

…SANTA CRUZ COUNTY…
9 NNW RIO RICO 0.15 IN 0145 AM 05/05 31.61N/111.04W
HOPKINS 0.01 IN 0501 AM 05/05 31.68N/110.88W

OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING
EQUIPMENT AND EXPOSURE. NOT ALL DATA LISTED ARE CONSIDERED OFFICIAL.

Monday’s Tucson Forecast: Thunder threat to start the work week

TODAY’S BLOGCAST

THE CLIFF NOTES

7DayForecast050415

Today – 20% chance of storms. 82°, west-southwest wind 10-15 MPH.

Tonight – 20% chance of storms through midnight. 59°, southeast wind 5 MPH.

Tomorrow – Mostly sunny. 82°, west wind 10-15 MPH.

TODAY’S FORECAST DISCUSSION

NOAA's HRRR Model - Valid 4 PM Monday
NOAA’s HRRR Model – Valid 4 PM Monday

A low pressure trough moves toward the Colorado River Valley today. This feature interacts with enough moisture to trigger isolated storms this morning through the evening hours. Areas north of a Tucson-Willcox line stand the best chance of seeing storms, while towns south of the metro stand a slight chance.

Highs this afternoon reach the low 80s, with overnight lows dropping to the upper 50s. Storm chances decrease after midnight.

Mid to late week looks blustery as a storm system passes north of the state. Expect 20-25 MPH gusts Wednesday through Friday under mostly sunny skies. Daytime highs through the weekend remain in the 80s. High pressure is slated to arrive by Mother’s Day, supplying sunny skies and high temps in upper 80s.

SKY CANDY OF THE DAY

OV Rainbow 050315

What do you get when you capture virga, a rainbow & Pusch Ridge glowing? The honors for today’s “Sky Candy”. Thanks to viewer Lynn Sharp from Oro Valley for snapping this dandy last night.

Weekend Outlook: Upon further review…

Wknd050115

This morning, I mentioned it was unlikely Tucson would see showers this weekend. I wasn’t seeing computer model consistency (some models said yes, others no). Also, moisture values in our atmosphere didn’t look all that impressive. Then came the 12Z model runs.

A weak shortwave trough kicks through the state Saturday. Nearly all short-range computer models suggest enough moisture to fuel a few isolated showers develop along and east of an Oracle-Tucson-Nogales line. It’s far from a sure thing, but I have introduced a 10% chance of showers to your Saturday afternoon forecast. Those odds bump up to 20% for Cochise, Graham and Greenlee Counties.

Rainfall amounts should generally be under 0.10″. A few places in the higher terrain maybe see a bit more than that.

Cancel the BBQ? Absolutely not. Dig the umbrella out of the closet? Might be a good idea.

Friday’s Tucson Forecast: Warm start to May, rain chances loom

TODAY’S BEAMISH BLOGCAST

THE CLIFF NOTES

Today – Mostly sunny, warm. 95°, west-northwest wind 10-15 MPH.

Tonight – Mostly clear. 64°, southeast wind 5 MPH.

Tomorrow – Partly cloudy, maybe a sprinkle. 92°, WSW wind 10-15 MPH.

TODAY’S FORECAST DISCUSSION

GFS Model - valid 11 PM Monday
GFS Model – valid 11 PM Monday

Mid 90s on tap again, but next week looks unsettled.

High pressure over New Mexico supplies daytime highs 8-10° above average today. If Tucson reaches the forecast high of 95°, it would be the 2nd straight day with temperatures achieving that mark. Mostly sunny skies prevail across southern Arizona.

A weak trough slides across the state this weekend. This may touch off a few showers into the mountains east of Tucson Saturday and Sunday. Early next week features a stronger storm system approaching from Baja California. Isolated showers are possible for the valley floors Monday afternoon, with a better chance of rain & gusty winds early Tuesday.

Temperatures for the first week of May will take a tumble. Much of next week should see Metro Tucson peak in the low to mid 80’s.

TODAY’S WEATHER HEADLINES

11196324_10103854726843402_2396156478639452394_n
Courtesy: Kim Affolder

Why is there smoke east of Tucson? It’s a prescribed burn happening the next few days in Redington Pass. (KVOA)

ICYMI – My post on all you ever wanted to know about 100° in Tucson. May come in handy for our Ice Break contest!

Heads up, Oro Valley weather geeks. SKYWARN spotter training scheduled for tomorrow at the town library. (NWS Tucson)

Record snowfall yesterday in Washington DC…sort of. (Capital Weather Gang)

Often Imitated. None More Accurate.