Frost Returns! Some Areas Will Have Frost Tuesday and Wednesday Mornings (Noon, 3.25.13)

— Written By

Table 1. In Whiteville, NC (Southestern, NC), there is potential for FROST on Wed. morning (3/27). This will be a 4 hour frost! Note the minimum is only 34 at weather shelter height – it will be colder on the ground at strawberry canopy. whiteville

A. More frost on the way!

After a very tough cold event last Friday morning (a true black frost), it looks like some areas of NC will be experiencing 1 or 2 nights of frost again this week! These frost events could be destructive to open blossom and popcorn stages. The temperature minimums will not be nearly so low as what we experienced at the end of last week, but with a more conventional “white frost” the temperatures don’t have to be as low to cause damage. This type of radiational frost event causes its damage by visible “ice crystal” formation on the blooms. Don’t be led to think that just because your minimum temperature is going to be at or above 32 F, that you are off the hook. In fact, in Whiteville, NC (southeastern NC) the minimum air temperature at weather shelter height will only be 34 F, but this area of the state could experience a potentially very damaging frost from 4 am – 8 am on Wednesday morning (3/27) – see this AWIS hourly forecast for Whiteville for further details whiteville awis

Here are locations where frost is currently in the forecast across NC – most locations will only have frost Wed morning, but others could have frost both Tue and Wed mornings:

Albemarle – had frost this morning. Anticipate frost 5-8 am Tue. & Wed 7 am

Asheboro – 7 am Tue, 4-8 am Wed

Burlington – 5-8 am Tue; 5-7 am Wed

Chapel Hill – 5 am Tue

Charlotte – 5 am Tue (it is interesting that the low in Charlotte will be around 29, Dew points in range of 22-24 and winds of 5 mph

Clinton – frost both Tue and Wed mornings

Elizabethtown – frost only Wed

Gastonia – frost this morning

Goldsboro – frost Wed

Greensboro – right now no frost in forecast but it seems borderline, and it would only take a slight rise in dew points and/or drop in winds (right now: min 31 F, 22 DP and 6 mph winds for tomorrow morning at 7 am)

Greenville – frost Wed

Kenansville – frost Wed

Kinston – frost Wed

Lexington – frost Wed

Lincolnton – frost Tue

Louisburg – frost Tue and Wed

Maxton – frost Wed

Monroe- frost Wed

Morganton – frost Wed

Oxford – frost Tue and Wed

Raleigh-Durham – frost Tue and Wed

Roanoke Rapids – frost Tue

Rocky Mount & Wilson – right now no frost, but with these numbers it could change! Min 32 F, DP 24, and winds 6 mph

Roxboro – frost Tue and Wed

Smithfield – frost Tue and Wed

Salisbury/Rowan – frost this morning, Tue and Wed

Sanford – frost Tue and Wed

Shelby – frost Wed

Statesville – frost Wed

Washington – frost Wed (7 am minimum of 36, 30 DP and winds 5 mph)

Whiteville – frost Wed (see Table 1)

Winston-Salem – again, no frost in forecast, but with a rise in Dewpoint, things could happen (7 am Wed:  30 min temp, 21 DP and 5 mph)

B. Here are the AWIS minimum temperatures for locations across NC for the next 7 days: noon update nc temps

C. Strategy  notes:  I would be prepared to frost protect if your area has a a forecast of 31 F or lower. Row covers will work well, or sprinkling. Both approaches can be very successful. There could be some issues for growers who removed covers on Saturday, and now they are wet. You cannot handle a wet cover without ruining it! If the covers cannot be unfurled by Tuesday afternoon then you should be ready to run sprinkler system at first sign of ice crystals forming on strawberry leaves – run until the ice is melting in the morning and wet bulb of 31 has been reached. Light irrigation rates of 0.10 – 0.12 inch per hour should suffice.

D. Color Coded Maps (Tue, Wed, and Thur)

Please note the AWIS minimum temperature maps for NC over the next 3 mornings (Tue, Wed, and Thur)

noon update tue morning7daytemp.nc.2

Figure 1. Tue morning minimums – the pink and dark pink areas in the piedmont could be at risk for damaging frost tomorrow morning – it will all come down to factors like dewpoint temperatures (the closer to 30 F, the more likely a frost); and, winds. If winds become calm, and temperatures are low enough, and dew points high enough, then a frost is likely.

noon update wed morning

Figure 2. Wed morning minimums.

“Additional weather details, including custom weather forecasts, are available from AWIS at www.awis.com.”

  thur morning update

Figure 3. Thur morning minimums.

“Additional weather details, including custom weather forecasts, are available from AWIS at www.awis.com.”

E. Here are the AWIS Frost/Freeze forecasts for Eastern NC, Central NC and Sandhills for tonight (doesn’t cover Western Piedmont, Foothills or Mountains)

AWIS Weather Services, Inc.
North Carolina Frost/Freeze Forecast
Produced at  506 AM CDT on Mon Mar 25 2013

… Forecast for Tonight …

Northeast NC Coast
Currituck/Camden/Pasquotank/Tyrrell Counties

**** NEAR FREEZING COLD LOCATIONS  ****
**** LITTLE IF ANY FROST DUE TO WIND ****

Lowest Temperatures:      34 – 40
Elizabeth_City Min          34
Range Dewpoint Temps:     25 – 35
Range Wetbulb  Temps:     32 – 42
AVG Wind Direction/Speed:   W 13
AVG Sky Condition:     Partly Cloudy

Extended Forecast: Range of Lowest Min Temperatures in the Above Zones
Min Temps Valid For Morning of Given Date (May NOT include ALL cold pockets)

03/27/13  03/28/13  03/29/13  03/30/13  03/31/13  04/01/13
——–  ——–  ——–  ——–  ——–  ——–
34 – 41   33 – 40   36 – 42   35 – 43   35 – 44   43 – 50
——–

East Central/SE NC Coast
Carteret/Pamlico Counties

**** NEAR FREEZING COLD LOCATIONS  ****
**** LITTLE IF ANY FROST DUE TO WIND ****

Lowest Temperatures:      34 – 36
Morehead_City Min           36
Range Dewpoint Temps:     24 – 31
Range Wetbulb  Temps:     32 – 42
AVG Wind Direction/Speed:   W 14
AVG Sky Condition:         Clear

Extended Forecast: Range of Lowest Min Temperatures in the Above Zones
Min Temps Valid For Morning of Given Date (May NOT include ALL cold pockets)

03/27/13  03/28/13  03/29/13  03/30/13  03/31/13  04/01/13
——–  ——–  ——–  ——–  ——–  ——–
34 – 36   33 – 37   35 – 38   36 – 39   35 – 39   43 – 47
——–

Southeast NC
NWS FORECAST ZONES 87-90,96-101

**** FREEZE COLD LOCATIONS  ****
**** LITTLE IF ANY FROST DUE TO WIND ****

Lowest Temperatures:      30 – 36
Elizabethtown Min           35
Durations at/below 32:     0 –  3
Range Dewpoint Temps:     17 – 30
Range Wetbulb  Temps:     30 – 39
AVG Wind Direction/Speed:   W 14
AVG Sky Condition:         Clear

Extended Forecast: Range of Lowest Min Temperatures in the Above Zones
Min Temps Valid For Morning of Given Date (May NOT include ALL cold pockets)

03/27/13  03/28/13  03/29/13  03/30/13  03/31/13  04/01/13
——–  ——–  ——–  ——–  ——–  ——–
30 – 35   30 – 35   33 – 38   34 – 39   34 – 40   42 – 47
——–

North-Central NC
Franklin County Area

**** FREEZING TEMPERATURES ****
** PATCHY FROST COLDEST PROTECTED AREAS **

Lowest Temperatures:      27 – 34
Louisburg Min               27
Durations at/below 32:     0 –  8
Durations at/below 28:     0 –  2
Range Dewpoint Temps:     19 – 27
Range Wetbulb  Temps:     29 – 33
AVG Wind Direction/Speed:   W  8
AVG Sky Condition:     Partly Cloudy

Extended Forecast: Range of Lowest Min Temperatures in the Above Zones
Min Temps Valid For Morning of Given Date (May NOT include ALL cold pockets)

03/27/13  03/28/13  03/29/13  03/30/13  03/31/13  04/01/13
——–  ——–  ——–  ——–  ——–  ——–
27 – 34   26 – 33   30 – 36   32 – 38   33 – 40   40 – 46
——–

North/Central NC
Alamance County Area

**** FREEZING TEMPERATURES ****
** PATCHY FROST COLDEST PROTECTED AREAS **

Lowest Temperatures:      28 – 34
Graham_AG Min               31
Durations at/below 32:     0 –  6
Durations at/below 28:     0 –  1
Range Dewpoint Temps:     19 – 27
Range Wetbulb  Temps:     29 – 33
AVG Wind Direction/Speed:   W  9
AVG Sky Condition:     Partly Cloudy

Extended Forecast: Range of Lowest Min Temperatures in the Above Zones
Min Temps Valid For Morning of Given Date (May NOT include ALL cold pockets)

03/27/13  03/28/13  03/29/13  03/30/13  03/31/13  04/01/13
——–  ——–  ——–  ——–  ——–  ——–
28 – 33   28 – 33   31 – 36   33 – 38   33 – 40   41 – 47
——–

South/Central NC
Richmond County Area

**** FREEZING TEMPERATURES ****
** PATCHY FROST COLDEST PROTECTED AREAS **

Lowest Temperatures:      29 – 34
Ellerbe Min                 34
Durations at/below 32:     0 –  5
Range Dewpoint Temps:     15 – 25
Range Wetbulb  Temps:     27 – 34
AVG Wind Direction/Speed:   W 11
AVG Sky Condition:     Partly Cloudy

Extended Forecast: Range of Lowest Min Temperatures in the Above Zones
Min Temps Valid For Morning of Given Date (May NOT include ALL cold pockets)

03/27/13  03/28/13  03/29/13  03/30/13  03/31/13  04/01/13
——–  ——–  ——–  ——–  ——–  ——–
29 – 33   29 – 34   32 – 36   34 – 37   36 – 38   42 – 45
——–

For more detailed information visit www.awis.com or call 888-798-9955.
Copyright 2013 AWIS Weather Services, Inc. All rights reserved.

Good luck!

Barclay

p.s. The advisories for tomorrow and Wed will be very brief due to confernce on Plant Health in Raleigh

Dr. E. Barclay Poling
Professor Emeritus/Extension Strawberry Specialist
Department of Horticultural Science
Campus Box 7609, 162A Kilgore Hall
NC State University
Raleigh, NC 27695-7609
919-418-9687 (Cell)
919-515-2505 (Fax)
barclay_poling@ncsu.edu
https://strawberries.ces.ncsu.edu

Written By

Photo of Barclay Poling, N.C. Cooperative ExtensionDr. Barclay PolingFormer Professor and Extension Specialist, Strawberries and Muscadines (919) 515-5373 (Office) barclay_poling@ncsu.eduHorticultural Science - NC State University
Posted on Mar 25, 2013
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